RPSC Inspector Of Factories And Boilers 2026: Inspector Of Factories And Boilers 2025, Inspector of Factories (Chemical)
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Rajasthan Public Service Commission
Factories and Boilers Inspection Department Exam 2025
Inspector of Factories (Chemical) – Question Paper
Exam Date: 19-Sep-2026
Exam Time: 03:00PM to 05:30PM
Test Duration: 150 mins
Total Inspector of Factories (Chemical) Questions: 150
Maximum Marks – Inspector of Factories (Chemical): 150
Inspector of Factories (Chemical)
A solid is transformed directly into vapour without passing through the liquid
1
phase when the pressure is:
Choice1 Above the triple-point pressure
Choice2 Equal to the critical pressure
Choice3 Below the triple-point pressure
Choice4 Equal to the saturation pressure
Inspector of Factories (Chemical)
Entropy is:
2
Choice1 Extensive property
Choice2 Intensive property
Choice3 Dimensionless quantity
Choice4 Path function
Inspector of Factories (Chemical)
Pure component A in the gas phase enters a reactor. 50% of A is converted to B
3
according to the reaction
A → 3B
The mole fraction of A in the exit stream is:
Choice1
1
2
Choice2
1
3
Choice3 1
4
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Choice4
1
5
Inspector of Factories (Chemical)
In an energy balance for a closed system, if no work is performed and changes
4
in kinetic energy and potential energy are negligible, the heat supplied to the
system is equal to the change in ________.
Choice1 Internal energy
Choice2 Enthalpy
Choice3 Entropy
Choice4 Gibbs free energy
Inspector of Factories (Chemical)
5 The partial molar Gibbs energy of component iin a mixture is equal to its:
Choice1 Activity coefficient, γ i
Choice2 Mole fraction, x i
Choice3 Chemical potential, μ i
Choice4 Partial pressure, ρ i
Inspector of Factories (Chemical)
Given below are two statements:
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Statement I: During a reversible adiabatic expansion of an ideal gas, the
entropy remains constant, and the change in internal energy is equal to the
work done by the system (considering the appropriate sign convention).
Statement II: During a reversible isothermal expansion of an ideal gas, the
change in internal energy is zero, and the heat absorbed by the system is
equal to the work done by the system.
In light of the above statements, choose the correct answer from the options
given below.
Choice1 Both Statement I and Statement II are true.
Choice2 Both Statement I and Statement II are false.
Choice3 Statement I is true, but Statement II is false.
Choice4 Statement I is false, but Statement II is true.
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Inspector of Factories (Chemical)
The van der Waals equation of state corrects the ideal gas law by introducing
7
terms for:
Choice1 Heat capacity and viscosity of the gas
Choice2 Thermal conductivity and diffusivity of the gas
Choice3 Molecular volume and molecular attractive forces
Choice4 Surface tension and density of the gas
Inspector of Factories (Chemical)
For a reversible process, the change in entropy is best expressed by
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Choice1
Choice2
Choice3
Choice4
Inspector of Factories (Chemical)
A pure water system consists of ice, liquid water, and water vapor in
9
equilibrium. The degree of freedom of the system is:
Choice1 0
Choice2 1
Choice3 2
Choice4 3
Inspector of Factories (Chemical)
Which of the following statements correctly describes entropy?
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Choice1 Entropy is a state function
Choice2 Entropy is a path function
Choice3 Entropy remains constant for all thermodynamic processes
Choice4 Entropy has units of pressure
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Inspector of Factories (Chemical)
For a closed system, the First Law of Thermodynamics is expressed as (work
11
done by the system is assumed to be positive.) :
Choice1 dU = δQ + δW
Choice2 dU = δQ − δW
Choice3 dU = −δQ + δW
Choice4 dU = δW − δQ
Inspector of Factories (Chemical)
Which of the following statements is correct regarding the density of liquid
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mixtures?
The density of a liquid mixture is always equal to the arithmetic average of the
Choice1
component densities.
Choice2 The density of a liquid mixture depends only on temperature.
The density of a liquid mixture depends on composition, temperature, and
Choice3
pressure.
Choice4 The density of a liquid mixture is independent of intermolecular interactions.
Inspector of Factories (Chemical)
In a chemical process, the primary purpose of a bypass stream is to:
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Choice1 Increase the residence time of the reactants.
Choice2 Divert a portion of the process stream around a unit operation.
Choice3 Reduce the energy consumption of the reactor.
Choice4 Maintain a constant composition throughout the entire process.
Inspector of Factories (Chemical)
For a chemical reaction occurring at equilibrium under constant temperature
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and pressure, the change in Gibbs free energy is:
Choice1 Positive (ΔG > 0)
Choice2 Negative (ΔG < 0)
Choice3 Zero (ΔG = 0)
Choice4 Equal to the enthalpy change (ΔG = ΔH )
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Inspector of Factories (Chemical)
Which of the following correctly represents the Gibbs Phase Rule for a non-
15
reacting system?
Where:
F = degrees of freedom
C = number of components
P = number of phases
Choice1 F = C − P + 2
Choice2 F = C + P − 2
Choice3 F = C − P − 2
Choice4 F = P − C + 2
Inspector of Factories (Chemical)
A branch in a water distribution network splits into two parallel pipes. Pipe A is
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shorter but rougher, whereas Pipe B is longer but smoother. A constant
pressure difference is maintained between the inlet and outlet junctions.
Which statement correctly describes the flow distribution?
The flow divides such that the head loss through each branch is identical, with
Choice1
the actual flow rates depending on the hydraulic resistance of each branch.
Equal flow always occurs because both branches experience the same pressure
Choice2
drop.
The shorter pipe always carries the larger flow because the travel distance is
Choice3
smaller.
Choice4 The smoother pipe always carries more flow regardless of its length.
Inspector of Factories (Chemical)
During an orifice meter calibration experiment, the downstream pressure
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decreases below the vapor pressure of the liquid as the flow rate is increased.
Under these conditions, which following phenomenon is expected to occur,
and what is its consequence on operation of the orifice.
Superheating; the liquid temperature will increase exponentially due to local
Choice1
friction created by narrow orifice opening, creating a dense safety hazard.
Thermal Choking; the liquid will undergo an isothermal phase change that locs
Choice2
the volumetric flow rate at constant maximum value.
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Sublimation; the liquid will directly transition into a solid crystal state at the
Choice3
vena contracta, completely blocking the flow.
Cavitation; it will cause vapor bubbles to form and violently collapse, resulting
Choice4
in structural erosion and reading inaccuracies.
Inspector of Factories (Chemical)
A process requires pumping a 60,000 cP shear-sensitive polymer melt at 250°C.
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The pump must deliver uniform flow with minimal pressure pulsation,
maintain dimensional consistency of the extruded product, and operate
against discharge pressures that fluctuate during production. Which pump is
the most suitable?
Choice1 A rotary positive displacement pump
Choice2 A regenerative turbine pump
Choice3 An Axial-flow pump
Choice4 Reciprocating plunger pump
Inspector of Factories (Chemical)
For a steady incompressible flow through a pipe with varying cross-sectional
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area, what happens to the fluid velocity when the cross-sectional area
decreases?
Choice1 It decreases in direct proportion to the reduction in area.
Choice2 It increases in accordance with the continuity equation.
Choice3 It remains constant throughout the pipe.
Choice4 It becomes zero at the smaller cross-section.
Inspector of Factories (Chemical)
Which of the following statements correctly defines a Newtonian fluid?
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Choice1 A fluid whose viscosity decreases as the applied shear rate increases
Choice2 A fluid whose viscosity increases as the applied shear rate increases
Choice3 A fluid whose viscosity stays constant irrespective of the applied shear rate
Choice4 A fluid whose response to applied shear stress is partly elastic in nature
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Inspector of Factories (Chemical)
The Darcy–Weisbach equation gives the frictional head loss in a pipe as a
21
function of which of the following?
Choice1 Flow rate and pipe length only, with no other quantities involved
Choice2 Fluid velocity and pipe diameter only, with no other quantities involved
Choice3 Friction factor, pipe length, pipe diameter, and the velocity head
Choice4 Reynolds number and fluid viscosity only, with no other quantities involved
Inspector of Factories (Chemical)
Which of the following pumps is best suited for pumping highly viscous
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fluids in industrial processes?
Choice1 Centrifugal pump
Choice2 Gear pump
Choice3 Axial flow pump
Choice4 Diaphragm pump
Inspector of Factories (Chemical)
23 Three vessels of different shapes are filled with the same liquid up to
the same height h1 and are open to the atmosphere, as shown in the
figure. If P is the atmospheric pressure, the pressure at the bottom of
0
each vessel is:
Choice1 Greatest in the second vessel because it contains the largest volume of liquid.
Choice2 Greatest in the first vessel because the liquid column is taller.
Choice3 The same for all three vessels
Different for each vessel because pressure depends on the shape of the
Choice4
container.
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Inspector of Factories (Chemical)
Which dimensionless number represents inertia to gravity force?
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Choice1 Reynolds number
Choice2 Weber number
Choice3 Euler number
Choice4 Froude number
Inspector of Factories (Chemical)
A large cylindrical water tank is open to the atmosphere and filled to a height
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of 5 m above the outlet tap. Upon opening the tap, the water flows out to the
atmosphere through the smooth and rounded outlet. Assuming flow is
irrotational, incompressible and steady. Calculate the exit velocity of the water.
(Take g = 10 m/s2).
Choice1 8.9 m/s
Choice2 10.0 m/s
Choice3 15 m/s
Choice4 18.5 m/s
Inspector of Factories (Chemical)
A fluid type that is less resistant at higher strain rate is called ______.
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Choice1 Newtonian
Choice2 Dilatant
Choice3 Bingham
Choice4 Pseudoplastic
Inspector of Factories (Chemical)
Which of the following instruments is most suitable for measuring the velocity
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of a fluid at a specific point in a flow field?
Choice1 Manometer
Choice2 Venturimeter
Choice3 Pitot tube
Choice4 Rotameter
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Inspector of Factories (Chemical)
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Choice1
Choice2
Choice3
Choice4
Inspector of Factories (Chemical)
What are the correct flow assumptions for the derivation of the Bernoulli
29
equation?
Choice1 Unsteady, compressible, frictionless
Choice2 Steady , compressible, flow along a single streamline
Steady flow, incompressible flow, frictionless flow, and flow along a single
Choice3
streamline
Unsteady flow, incompressible flow, frictionless flow, and flow along a single
Choice4
streamline
Inspector of Factories (Chemical)
Cavitation occurs when:
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Choice1 Re>4000
Choice2 Static pressure falls below vapor pressure
Choice3 Flow becomes supersonic
Choice4 Dynamic pressure becomes zero
Inspector of Factories (Chemical)
The ratio of heat conducted to heat stored is called as ______
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Choice1 Heat transfer coefficient
Choice2 Thermal conductivity
Choice3 Thermal diffusivity
Choice4 Heat capacity
Inspector of Factories (Chemical)
32 A fin effectiveness of (ε f in ) = 1indicates that the addition of fins to the
surface ____
Choice1 Does not affect heat transfer at all
Choice2 Enhances the heat transfer
Choice3 Decreases the heat transfer
Choice4 First enhances and then remains constant
Inspector of Factories (Chemical)
When the Biot number (Bi>1) is greater than ONE, which of the following
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statements is TRUE?
Internal conduction resistance is negligible compared to the external
Choice1
convection resistance
Choice2 Temperature within the solid is uniform at any instant of time
Choice3 Lumped system analysis can be accurately used for transient heat transfer
External convection resistance is negligible compared to the internal
Choice4
conduction resistance
Inspector of Factories (Chemical)
Evaporation is a liquid-to-vapor phase change process, which occurs at the
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liquid–vapor interface when ______
The vapor pressure is less than the saturation pressure of the liquid at a given
Choice1
temperature.
The vapor pressure is more than the saturation pressure of the liquid at a
Choice2
given temperature.
The vapor pressure is the same as the saturation pressure of the liquid at a
Choice3
given temperature.
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The vapor pressure is the same as the external pressure of the liquid at a given
Choice4
temperature.
Inspector of Factories (Chemical)
The statement – “view factor from a surface ‘i’ to a surface ‘j’ is equal to the
35
sum of the view factors from surface ‘i’ to the parts of surface ‘j’ ”, is called as
___
Choice1 Reciprocity rule
Choice2 Summation rule
Choice3 Superposition Rule
Choice4 Symmetry Rule
Inspector of Factories (Chemical)
Under what conditions is the following heat transfer relation valid for a heat
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exchanger?
Steady operating conditions exist, the heat exchanger is well-insulated (no
Choice1
heat loss to the surroundings), and fluid properties are constant
The heat exchanger operates under transient conditions with significant heat
Choice2
loss to the environment and variable fluid properties
Only the cold fluid side energy balance is valid, regardless of insulation or
Choice3
operating conditions
The heat exchanger has axial heat conduction in the metal pipe, unsteady flow,
Choice4
and significant kinetic/potential energy changes
Inspector of Factories (Chemical)
In the flow of a liquid through a heated circular pipe, heat is transferred from
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the hot pipe wall to the liquid primarily by:
Choice1 Conduction only
Choice2 Convection only
Choice3 Radiation only
Conduction through the fluid layer adjacent to the wall, followed by convection
Choice4
within the flowing liquid
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Inspector of Factories (Chemical)
Consider flow over a flat plate. The horizontal plate with temperature (
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), is maintained at a higher temperature than the inlet stream.
For this example, consider the following two cases:
Case A: Water (Pr∼7) is flowing over a flat plate
Case B: Engine Oil (Pr∼100) is flowing over a flat plate
Which of the following statements regarding the thickness of the THERMAL
boundary layer ( ) is true?
Choice1 δ T BL (CaseA) > δ T BL (CaseB)
Choice2 δ T BL (CaseA) < δ T BL (CaseB)
Choice3 δ T BL (CaseA) = δ T BL (CaseB)
Choice4 None of above
Inspector of Factories (Chemical)
39 Thermal conductivity of copper (Cu) and Nickel (Ni) is 401 W/m oC and 91 W/m
oC respectively at 300K. If both are used to make their alloy named constantan
(55% Cu and 45% nickel), then thermal conductivity of resulting alloy would be:
Choice1 Equal or greater than 401 W/m oC
Choice2 246 W/m oC
Choice3 261.5 W/m oC
Choice4 Less than 91 W/m oC
Inspector of Factories (Chemical)
In a concentric pipe heat exchanger, the concentric annulus has inner
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diameter Di and outside diameter Do. The hydraulic diameter of the annulus
will be:
Choice1 Do − Di
Choice2 Do−Di
2
Choice3
2 2
Do −Di
Di
Choice4
2 2
Do −Di
4
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Inspector of Factories (Chemical)
Select an appropriate heat exchanger for an aerospace application where
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weight and space are severely constrained:
Choice1 Gasketed plate heat exchanger
Choice2 Double pipe heat exchanger
Choice3 Shell and tube heat exchanger
Choice4 Compact plate-fin heat exchanger
Inspector of Factories (Chemical)
Which of the following is NOT an advantage of using baffles in a shell-and-tube
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heat exchanger?
Choice1 Increased shell-side heat transfer coefficient
Choice2 Improved tube support
Choice3 Reduced shell-side pressure drop
Choice4 Enhanced shell-side turbulence
Inspector of Factories (Chemical)
Under what operating condition is the effectiveness of a heat exchanger
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independent of its flow arrangement (parallel, counter or cross flow)?
Choice1 When the heat exchanger operates under highly turbulent flow conditions
Choice2 When the heat capacity rates of both the fluids are same (C h = Cc )
Choice3 When one of the fluids undergoes a phase change (condenser or evaporator)
Choice4 When the overall heat transfer coefficient is extremely low
Inspector of Factories (Chemical)
In a counterflow heat exchanger in which the two fluids have equal heat-
44
capacity rates, how does the local temperature difference between the hot
and cold fluids vary along the length?
Choice1 It stays essentially constant from one end of the exchanger to the other
Choice2 It decreases continuously from the hot-fluid inlet to the hot-fluid outlet
Choice3 It increases continuously along the direction of hot-fluid flow
Choice4 It first rises to a maximum at the mid-length and then falls again
Text of page 14
Inspector of Factories (Chemical)
The Biot number, a crucial dimensionless number in transient heat conduction
45
is interpreted in terms of its physical significance as:
Choice1 Ratio of momentum diffusivity to thermal diffusivity.
Choice2 Ratio of thermal energy stored to the thermal energy conducted.
Choice3 Ratio of conductive heat transfer rate to the convective heat transfer rate.
Ratio of internal thermal resistance of a solid to the external convective
Choice4
thermal resistance.
Inspector of Factories (Chemical)
When the equilibrium relationship is linear and the solute is highly soluble in
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the liquid phase, the overall resistance to mass transfer is controlled mainly by:
Choice1 The gas-phase resistance
Choice2 The liquid-phase resistance
Choice3 Both phases equally, always
Choice4 Neither phase offers any resistance
Inspector of Factories (Chemical)
When the solute has a very low solubility in the liquid phase (a large Henry's
47
law constant), the controlling resistance to mass transfer normally lies in:
Choice1 The gas phase
Choice2 The liquid phase
Choice3 The solid phase
Choice4 The interface itself
Inspector of Factories (Chemical)
According to the two-film theory, the resistance to mass transfer is assumed to
48
reside in:
Choice1 Turbulent eddies near the interface
Choice2 The bulk of each phase only
Choice3 A single film on the gas side only
Text of page 15
Choice4 Thin, stagnant films adjacent to the interface on each side
Inspector of Factories (Chemical)
The major limitation of the penetration theory, addressed by the surface
49
renewal theory, is the assumption that:
Choice1 All fluid elements have the same diffusivity
Choice2 The bulk fluid is stagnant
Choice3 All fluid elements are exposed at the interface for the same length of time
Choice4 The interface is not at equilibrium
Inspector of Factories (Chemical)
The overall mass transfer coefficient is used in preference to individual phase
50
coefficients mainly because:
Choice1 Individual phase coefficients cannot be measured at all
Choice2 Overall coefficients are always numerically larger
Choice3 Only one phase resistance ever exists
Choice4 Interfacial concentrations are not directly measurable in practice
Inspector of Factories (Chemical)
A continuous contacting (differential) device, such as a packed tower, differs
51
from a stagewise device in that:
Choice1 Concentration changes occur abruptly between discrete equilibrium stages
The compositions of both phases change continuously and gradually along the
Choice2
path of contact
Choice3 No equilibrium curve is needed in its design
Choice4 Only batch operation is possible
Inspector of Factories (Chemical)
In which of the following situations, Knudsen diffusion is expected to be
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significant?
Choice1 Liquid-phase diffusion through large pores
Choice2 Gas-phase diffusion through a very fine pore at low pressure
Text of page 16
Choice3 Diffusion in a molten metal
Choice4 Gas-phase diffusion through a large-diameter pipe at high pressure
Inspector of Factories (Chemical)
Liquid-liquid extraction is an attractive alternative to distillation particularly
53
when:
Choice1 The components to be separated have a high relative volatility
The components to be separated have very close boiling points, making
Choice2
distillation impractical
Choice3 Only gaseous mixtures are involved
Choice4 High temperatures are desired for separation
Inspector of Factories (Chemical)
Given below are two statements:
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Statement I: The wet-bulb temperature is the steady-state temperature
attained by a small quantity of liquid evaporating under adiabatic conditions
into a continuously flowing gas stream.
Statement II: For an unsaturated air–water vapour mixture, the wet-bulb
temperature is always higher than the dry-bulb temperature.
In light of the above statements, choose the correct answer from the options
given below.
Choice1 Both Statement I and Statement II are true.
Choice2 Both Statement I and Statement II are false.
Choice3 Statement I is true, but Statement II is false.
Choice4 Statement I is false, but Statement II is true.
Inspector of Factories (Chemical)
Which of the following statements regarding a binary mixture separated in a
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tray distillation column with non-ideal stages is correct?
Choice1 The point efficiency may be greater than 100%.
Choice2 The Murphree tray efficiency can never exceed 100%.
Choice3 The Murphree tray efficiency may exceed 100%.
Choice4 Both the Murphree tray efficiency and the point efficiency may exceed 100%.
Text of page 17
Inspector of Factories (Chemical)
"Diffusional extraction," as a category of solid-liquid extraction, refers to
56
systems in which:
Choice1 Mass transfer resistance lies almost entirely in the solid phase.
Choice2 Mass transfer resistance lies entirely in the liquid phase.
Choice3 No diffusion occurs; only mechanical washing takes place.
Choice4 The solid completely dissolves instantly.
Inspector of Factories (Chemical)
For an ideal solution obeying Raoult's law, the partial pressure of a component
57
is proportional to its:
Choice1 Mass fraction
Choice2 Mole fraction in the vapor phase
Choice3 Mole fraction in the liquid phase
Choice4 Density
Inspector of Factories (Chemical)
Given below are two statements:
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Statement I: The reflux ratio influences both the separation efficiency and the
energy requirement of a distillation column.
Statement II: Increasing the reflux ratio always enhances separation without
causing any increase in operating costs.
In light of the above statements, choose the correct answer from the options
given below.
Choice1 Both Statement I and Statement II are true.
Choice2 Both Statement I and Statement II are false.
Choice3 Statement I is true, but Statement II is false.
Choice4 Statement I is false, but Statement II is true.
Inspector of Factories (Chemical)
The "constant rate period" of drying is primarily controlled by:
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External convective heat and mass transfer resistance at the wetted surface of
Choice1
the solid.
Text of page 18
Choice2 The internal diffusion of moisture within the solid.
Choice3 Chemical binding forces between moisture and solid.
Choice4 The thermal conductivity of the dry solid only.
Inspector of Factories (Chemical)
In the drying of solids, moisture that exerts an equilibrium vapour pressure
60
lower than that of pure water at the same temperature is known as:
Choice1 Unbound moisture
Choice2 Free moisture
Choice3 Bound moisture
Choice4 Surface moisture
Inspector of Factories (Chemical)
For a distillation column operating with a saturated liquid feed, the slope of the
61
q-line is:
Choice1 Equal to zero, giving a horizontal q-line
Choice2 Infinite in magnitude, giving a vertical q-line
Choice3 Greater than unity but finite in magnitude
Choice4 Less than unity but greater than zero
Inspector of Factories (Chemical)
According to the penetration theory of mass transfer, the liquid-phase mass
62
transfer coefficient is proportional to:
Choice1 D AB
Choice2 √ D AB
Choice3
1
D AB
Choice4
1
√ D AB
Inspector of Factories (Chemical)
In an ideal leaching stage, equilibrium between the solid and liquid phases is
63
considered to be established when:
Text of page 19
The solute is entirely adsorbed onto the outer surface of the solid particles
Choice1
present
The solution retained by the solid has the same composition as the overflow
Choice2
solution leaving
The solid particles retain no liquid at all once separated from the surrounding
Choice3
solution
The overflow stream and the underflow stream leave the stage at identical
Choice4
mass flow rates
Inspector of Factories (Chemical)
For dilute solutions of non-electrolytes, the molecular diffusivity in a liquid
64
generally varies with temperature as:
Choice1
1
D AB ∝
T
Choice2 D AB ∝ T
Choice3 D AB ∝ μT
Choice4
T
D AB ∝
μ
Inspector of Factories (Chemical)
In a ternary equilibrium (triangular) diagram used for liquid-liquid extraction, a
65
tie line joins:
Choice1 The two terminal points that bound the plait point region of the diagram
Choice2 The equilibrium compositions of the extract phase and the raffinate phase
Choice3 The feed mixture composition directly to the added pure solvent composition
The points representing two liquid mixtures that happen to share equal
Choice4
density
Inspector of Factories (Chemical)
According to the collision theory of chemical reactions, the rate constant (k) is
66
directly proportional to which of the following expressions?
Choice1 T
Choice2
E
−
Te RT
Choice3
E
−
e RT
Text of page 20
Choice4
1 E
−
T 2 e RT
Inspector of Factories (Chemical)
In the design equations, how does the reaction rate, -rA appear for a mixed
67
flow reactor (MFR) compared with a plug flow reactor (PFR)?
Choice1 It varies along both the MFR and the PFR reactor lengths.
Choice2 It stays constant in both the MFR and the PFR reactor volumes.
Choice3 It stays constant in the MFR but varies along the PFR length.
Choice4 It varies within the MFR but stays constant along the PFR length.
Inspector of Factories (Chemical)
As the number N of equal-size mixed flow reactors in series is increased (for
68
an nth-order reaction, n > 0), the overall performance of the system:
Choice1 Approaches that of a single large MFR of the same total volume.
Choice2 Approaches that of a plug flow reactor, reaching it as N → ∞.
Choice3 Becomes independent of the number of reactors used.
Choice4 Requires progressively larger total volume for the same conversion.
Inspector of Factories (Chemical)
A proposed reaction mechanism predicts the overall reaction
69
2A + B → P roducts
Experimental measurements yield the rate law
r p = k [A] [B]
Which conclusion is most appropriate?
The overall reaction is non-elementary, and it follows more complex
Choice1
mechanisms
The experimental data are inconsistent because reaction order must equal the
Choice2
stoichiometric coefficients.
Choice3 The balanced equation should be rewritten to match the measured rate law.
Choice4 The catalyst has altered the stoichiometric coefficients of the reaction.
Text of page 21
Inspector of Factories (Chemical)
Space time for a plug flow reactor (for a first order reaction) is:
70
Choice1
C
Kln
C0
Choice2 1 C0
ln
K C
Choice3 1 C0
K C
Choice4
C0
Kln
C
Inspector of Factories (Chemical)
For an ideal plug flow reactor (PFR) carrying out a single first-order
71
reaction, how does the concentration of the reactant vary along the reactor?
Choice1 It remains unchanged from the inlet to the outlet.
Choice2 It increases uniformly as the fluid flows through the reactor.
Choice3 It decreases exponentially in the direction of flow.
Choice4 It decreases at a constant linear rate throughout the reactor.
Inspector of Factories (Chemical)
A chemical plant operates two parallel reactions:
72
• Desired reaction: Ea = 70 kJ/mol
• Undesired reaction: Ea = 130 kJ/mol
Both reactions have nearly identical pre-exponential factors. To increase
production, the reactor temperature is raised by 20°C.
Which engineering concern is most justified?
The desired reaction will become significantly more selective because of its
Choice1
lower activation energy.
The undesired reaction will accelerate proportionally more, potentially
Choice2
reducing product selectivity despite higher overall conversion.
Both reactions will respond equally because they have identical pre-
Choice3
exponential factors.
Product distribution will remain unchanged because activation energy affects
Choice4
only the equilibrium constant.
Text of page 22
Inspector of Factories (Chemical)
If n = overall order of a chemical reaction.
73
a = Initial concentration of reactant
t = Time required to complete a definite fraction of the reaction.
Then pick out the correct corelation:
Choice1 t ∝
1
a
n
Choice2
1
t ∝ n−1
a
Choice3
1
t ∝ n+1
a
Choice4
n
t ∝ a
Inspector of Factories (Chemical)
The rate of the chemical reaction A → B doubles as the concentration of A, i.e.,
74
CA is doubled. If the rate of reaction is proportional to C A
n
, then what is the
value of n for this reaction?
Choice1 0.5
Choice2 1
Choice3 0
Choice4 2
Inspector of Factories (Chemical)
The conversion for a first-order liquid phase reaction A → Bin a CSTR is 50%.
75
If another CSTR of the same volume is connected in series, then the %
conversion at the exit of the second reactor will be:
Choice1 60
Choice2 75
Choice3 90
Choice4 100
Inspector of Factories (Chemical)
For the first-order reaction, the time for half the reaction was 10 min where the
76
initial concentration was 6 x 10-2 moles/L. What is the specific reaction rate
constant?
Text of page 23
Choice1 0.069 min-1
Choice2 0.69 min-1
Choice3 0.138 min-1
Choice4 1.38 min-1
Inspector of Factories (Chemical)
For a mixed flow reactor, operating at steady state, the rate of reaction is given
77
by:
Choice1
F AO dC A
−
V dt
Choice2
F AO dC A
+
V dt
Choice3
F AO X A
V
Choice4
−dC A
dt
Inspector of Factories (Chemical)
A gas-phase reaction
78
A → 3R
is carried out isothermally in a PFR. A design engineer ignores gas expansion
and sizes the reactor using constant-density equations. What is the most likely
consequence?
The reactor will be oversized because the reaction rate increases with
Choice1
expansion.
The reactor will be undersized because gas expansion lowers reactant
Choice2
concentration and reaction rate.
The reactor size will be unaffected because first-order reactions depend only
Choice3
on temperature.
Choice4 The pressure drop will compensate exactly for gas expansion.
Inspector of Factories (Chemical)
A process engineer replaces a PFR with a CSTR without changing feed
79
composition or residence time. After startup, the selectivity to the desired
product decreases.
Which reaction network is most consistent with this observation?
Choice1 rD = k1 C
2
A
, rU = k2 CA
Text of page 24
Choice2 rD = k1 CA , rU = k2 C
2
A
Choice3 rD = k1 CA , rU = k2 CA
Choice4 rD = k1 , rU = k2
Inspector of Factories (Chemical)
Given below are two statements:
80
Statement I: The order of a homogeneous reaction is determined solely by
the stoichiometric coefficients of the reactants.
Statement II: The rate constant of a homogeneous reaction depends on
temperature but is independent of the concentrations of the reactants.
In light of the above statements, choose the correct answer from the options
given below.
Choice1 Both Statement I and Statement II are true.
Choice2 Both Statement I and Statement II are false.
Choice3 Statement I is true, but Statement II is false.
Choice4 Statement I is false, but Statement II is true.
Inspector of Factories (Chemical)
A feed of 100 mol of pure A is processed through the parallel reactions
81
A → B
A → C.
The reactor effluent contains 40 mol A, 45 mol B, and 15 mol C.
Which of the following statements is correct?
The conversion is 60%, the yield of B is 45%, and the selectivity of B relative to C
Choice1
is 3.0.
Choice2 The conversion is 60%, the yield is 75%, and the selectivity is 3.0.
Choice3 The conversion is 45%, because only 45 mol of desired product is obtained.
Choice4 The selectivity is 75%, because 75% of the reacted A forms the desired product.
Text of page 25
Inspector of Factories (Chemical)
A batch reactor carries out the reactions
82
With -rA = k1, -rR = k2 CR
During operation, operators observe that A is still detectable, yet the
concentration of R begins to decrease while S continues to increase. Which
conclusion is most appropriate?
The zero-order reaction has terminated because the concentration of A has
Choice1
become low.
The rate of formation of R is still constant, but its first-order consumption has
Choice2
become larger than its formation rate.
Choice3 The reactor has reached steady state.
Choice4 The catalyst has become inactive.
Inspector of Factories (Chemical)
For a variable-volume batch reactor, which of the following expressions
83
correctly represents the reaction rate, -rA, in terms of conversion (X A )?
Choice1
Choice2
Choice3
Choice4
Inspector of Factories (Chemical)
84 The half-life of the nth-order reaction in batch reactor depends on-
Choice1 only the rate constant.
Choice2 only the rate constant and the order of the reaction.
Choice3 only the rate constant and the initial reactant concentration.
Choice4 The rate constant, initial reactant concentration and the order of the reaction.
Text of page 26
Inspector of Factories (Chemical)
For the elementary reaction
85
B + 2D → 3T ,
the rate equations are written as
The correct relationship among the rate constants is:
Choice1 k B = 2k D = 3k T
Choice2 kB =
1
2
kD =
1
3
kT
Choice3 kB = kD = kT
Choice4 kB =
3
2
kD =
2
3
kT
Inspector of Factories (Chemical)
Which of the following is an example of a wide aperture release?
86
Choice1 A small crack in a flange causing a slow leak
Choice2 A pinhole leak in a pipeline
Choice3 Overpressuring and explosion of a storage tank
Choice4 A partially open valve leaking process fluid
Inspector of Factories (Chemical)
The fatal accident rate (FAR) reports the number of fatalities based on 1000
87
employees working
Choice1 working hours
6
10
Choice2 10
7
working hours
Choice3 10
8
working hours
Choice4 10
5
working hours
Inspector of Factories (Chemical)
OSHA stands for:
88
Choice1 Occupational Safety and Health Administration
Text of page 27
Choice2 Organization for Safety and Hazard Assessment
Choice3 Occupational Standards and Hazard Authority
Choice4 Office of Safety and Health Assessment
Inspector of Factories (Chemical)
Autoignition temperature (AIT) is ______
89
A fixed temperature ABOVE which adequate energy is available in the
Choice1
environment to provide an ignition source
A fixed temperature BELOW which adequate energy is available in the
Choice2
environment to provide an ignition source
A RANGE OF temperature in which adequate energy is available in the
Choice3
environment to provide an ignition source
Choice4 A temperature at which ignition is NOT needed for fire
Inspector of Factories (Chemical)
While dealing with responses (may or may not be reversible) of toxicants to the
90
human body, which of the following terms is used to denote the effects on the
kidney?
Choice1 Hemotoxic
Choice2 Hepatotoxic
Choice3 Pulmonotoxic
Choice4 Nephrotoxic
Inspector of Factories (Chemical)
The three phases in any industrial hygiene project are identification,
91
evaluation, and Control. Which of the following best describes the evaluation?
Choice1 determination of the magnitude of exposure
application of appropriate technology to reduce workplace exposures to
Choice2
acceptable levels
Choice3 determination of the possibility of workplace exposures
application of appropriate technology to reduce the probability of workplace
Choice4
exposures
Text of page 28
Inspector of Factories (Chemical)
The fatality rate is defined as:
92
Choice1 Number of injuries per 100 workers.
Number of fatalities per year divided by the total number of people in the
Choice2
applicable population.
Choice3 Number of fatalities divided by total work hours.
Choice4 Number of lost workdays per employee.
Inspector of Factories (Chemical)
An explosion in which the reaction front moves at a speed less than the speed
93
of sound in the unreacted medium is called as______
Choice1 Fire
Choice2 Deflagration
Choice3 Detonation
Choice4 Mechanical explosion
Inspector of Factories (Chemical)
Boiling-liquid expanding-vapor explosion (BLEVE) occurs when a vessel
94
ruptures, containing a liquid that is:
Choice1 At a temperature below its atmospheric boiling point
Choice2 At a temperature above its atmospheric boiling point
Choice3 At a temperature above its supersaturation temperature
Choice4 At a temperature below its supersaturation temperature
Inspector of Factories (Chemical)
A worker is exposed to a solvent vapor at the following concentrations during
95
an 8-hour shift: 150 ppm for 2 hours, 75 ppm for 4 hours, and 25 ppm for 2
hours. What is the Time-Weighted Average (TWA) concentration?
Choice1 81.25 ppm
Choice2 108.3 ppm
Choice3 83.3 ppm
Choice4 100 ppm
Text of page 29
Inspector of Factories (Chemical)
Particles obtained from homogeneous solids generally have:
96
Choice1 Different densities from the bulk material.
Choice2 The same density as the bulk material.
Choice3 Lower density than the bulk material.
Choice4 Higher density than the bulk material.
Inspector of Factories (Chemical)
In Tyler Series, the ratio of the aperture size of a screen to that of the next
97
smaller screen is:
1
Choice1 √2
Choice2 √2
Choice3 1.5
Choice4 2
Inspector of Factories (Chemical)
Ultrafine wet grinding is done in-
98
Choice1 Fluid energy mills
Choice2 Hammer mills
Choice3 Agitated mills
Choice4 All of these
Inspector of Factories (Chemical)
Rittinger's law can be obtained from generalized differential relation:
99
When the exponent 'n' is equal to:
Choice1 0.5
Choice2 1.0
Choice3 1.5
Text of page 30
Choice4 2.0
Inspector of Factories (Chemical)
Compression is generally used for:
100
Choice1 Fine grinding of soft materials.
Choice2 Coarse reduction of hard solids.
Choice3 Cutting plastics into cubes.
Choice4 Producing powders by rubbing.
Inspector of Factories (Chemical)
Which of the following is NOT a common mechanism of size reduction?
101
Choice1 Compression
Choice2 Impact
Choice3 Attrition
Choice4 Filtration
Inspector of Factories (Chemical)
Which statement best describes the working principle of an industrial vibrating
102
screen?
Choice1 Separation occurs solely due to density differences.
Choice2 Separation occurs according to particle size through screen apertures.
Choice3 Separation occurs according to particle colour.
Choice4 Separation occurs according to magnetic properties.
Inspector of Factories (Chemical)
Material A has a Bond's Work Index of 12 kWh/tonne, while Material B has a
103
Bond's Work Index of 18 kWh/tonne. Which statement is correct?
Choice1 Material A is harder to grind.
Choice2 Material B is easier to grind.
Choice3 Material B requires more energy for grinding.
Choice4 Both materials require equal grinding energy.
Text of page 31
Inspector of Factories (Chemical)
Size analysis was carried out on a sample of gravel. The data for mass fraction
104
and average particle diameter ( ) of the fraction is given in the table
below:
0.2 5
0.4 10
0.4 20
The mass mean diameter of the sample, to the nearest integer is:
Choice1 10 mm
Choice2 11 mm
Choice3 12 mm
Choice4 13 mm
Inspector of Factories (Chemical)
105 The crushing efficiency ( ) is defined as the ratio of:
Choice1 Energy absorbed by the solid to total machine power input.
Choice2 Surface energy created by crushing to the energy absorbed by the solid.
Choice3 Surface area of product to surface area of feed.
Choice4 Mechanical efficiency to crushing efficiency.
Inspector of Factories (Chemical)
In a Mikro-Atomizer hammer mill with internal classification, whether a particle
106
is discharged as product or return for further grinding primarily depends on:
Choice1 The impact force exerted by the hammers
Text of page 32
The balance between air-drag force and centrifugal force exerted by the
Choice2
separator vanes.
Choice3 The density difference between particles and air.
Choice4 The residence time of particles in the grinding chamber.
Inspector of Factories (Chemical)
Consider a cylinder (diameter D and length D), a sphere (Diameter D) and a
107
cube (side length D), which of the following statements concerning the
sphericity (Φ) of the above object is true?
Choice1 Φ sphere > Φ cylinder > Φ cube
Choice2 Φ sphere = Φ cylinder = Φ cube
Choice3
Choice4 Φ sphere > Φ cylinder = Φ cube
Inspector of Factories (Chemical)
108 For many crushed materials, the sphericity ( ) generally lies between:
Choice1 0.2 and 0.4
Choice2 0.4 and 0.6
Choice3 0.6 and 0.8
Choice4 0.8 and 1.2
Inspector of Factories (Chemical)
Coarse particles are generally measured in:
109
Choice1 Nanometers
Choice2 Micrometers
Choice3 Inches or millimeters
Choice4 Angstroms
Text of page 33
Inspector of Factories (Chemical)
In a cyclone separator used for separation of solid particles from a dust-laden
110
gas, the separation factor is defined as the ratio of the centrifugal force to the
gravitational force acting on the particle. S denotes the separation factor at a
location (near the wall) that is at a radial distance, r from the center of the
cyclone. Which one of the following statements is INCORRECT?
Choice1 S depends on mass of the particle
Choice2 S depends on the acceleration due to gravity
Choice3 S depends on tangitional velocity of the particle
Choice4 S depends on the radius location (r) of the particle
Inspector of Factories (Chemical)
At the end of the project life, the recovery of working capital for an industrial
111
operation neglecting the time value of money provides:
Choice1 Negative Cash Flow
Choice2 Positive Cash Flow
Choice3 Zero Cash Flow
Choice4 No Cash Flow
Inspector of Factories (Chemical)
The future worth in the terms of present worth, nominal interest rate and
112
number of years is given by:
Choice1 F = P ⋅ e
(r⋅N )
Choice2 F = P ⋅ e
(−r⋅N )
Choice3
(r⋅N )
e
F =
P
Choice4
P
F =
(−r⋅N )
e
Inspector of Factories (Chemical)
According to design consideration for shell and tube heat exchangers, where
113
should a more viscous fluid generally be allocated to obtain a higher heat
transfer coefficient?
Choice1 Tube side, because tube side coefficient is always higher.
Choice2 Shell side, because turbulence can provide a higher heat transfer coefficient.
Text of page 34
Choice3 Either side, as viscosity doesn't affect the heat transfer coefficient.
Choice4 Tube side, because it always gives lower pressure drop.
Inspector of Factories (Chemical)
A 25% cut segmental baffle has a baffle height equal to approximately:
114
Choice1 25% of shell diameter
Choice2 50% of shell diameter
Choice3 75% of shell diameter
Choice4 100% of shell diameter
Inspector of Factories (Chemical)
Gross profit is equal to total revenue minus:
115
Choice1 Income tax.
Choice2 Total production cost.
Choice3 Fixed investment.
Choice4 Depreciation cost.
Inspector of Factories (Chemical)
A chemical plant has a fixed cost of ₹12,00,000 per year. The selling price of
116
the product is ₹800 per unit, while the variable cost is ₹500 per unit. The
break-even production (units/year) is:
Choice1 3000
Choice2 4000
Choice3 5000
Choice4 6000
Inspector of Factories (Chemical)
For a thin cylindrical shell pressure vessel subjected to internal pressure, the
117
hoop stress is given by:
Where, P = Internal Pressure
D = Internal Diameter
t = Shell thickness
Text of page 35
Choice1
PD
σh =
2t
Choice2 σh =
PD
4t
Choice3
2P D
σh =
t
Choice4 σh =
PD
8t
Inspector of Factories (Chemical)
Which depreciation method assumes equal depreciation every year?
118
Choice1 Double declining balance
Choice2 Straight line
Choice3 Sum of years digits
Choice4 MACRS
Inspector of Factories (Chemical)
According to the law of demand, when the price of a commodity increases,
119
demand generally:
Choice1 Increases
Choice2 Remains constant
Choice3 Decreases
Choice4 Becomes infinite
Inspector of Factories (Chemical)
The principal mode of failure of a thin cylindrical shell subjected to external
120
pressure is:
Choice1 Tensile failure
Choice2 Plastic deformation
Choice3 Buckling (collapse)
Choice4 Fatigue cracking
Inspector of Factories (Chemical)
What is a major advantage of the continuous hydrolysis and saponification
121
process over the batch saponification process?
Text of page 36
Choice1 Lower glycerin yield
Choice2 Higher glycerin yield
Choice3 Greater color formation
Choice4 Higher manpower requirement.
Inspector of Factories (Chemical)
For the manufacture of methanol by catalytic hydrogenation of carbon
122
monoxide, the minimum theoretical molar ratio H2/CO must be:
Choice1 1:2
Choice2 3:1
Choice3 2:1
Choice4 4:1
Inspector of Factories (Chemical)
According to thermodynamic equilibrium considerations (ignoring reaction
123
kinetics), which combination of operating conditions most favours ammonia
formation in the Haber–Bosch reaction?
Choice1 The reaction is favored at high temperature and low pressure.
Choice2 The reaction is favored at high pressure and high temperature.
Choice3 The reaction is favored at high pressure and low temperature.
Choice4 The reaction is favored at low pressure and low temperature.
Inspector of Factories (Chemical)
A cement manufacturer converts a wet-process plant to a modern dry-process
124
plant with a preheater and precalciner. Which of the following changes is
expected?
Choice1 Increase in kiln length and fuel consumption
Choice2 Decrease in kiln length and specific fuel consumption
Choice3 Increase in slurry moisture content
Choice4 Decrease in clinker production rate
Text of page 37
Inspector of Factories (Chemical)
The softening point of normal PVC generally lies between:
125
Choice1 20 - 60°C
Choice2 50 - 80°C
Choice3 80 - 140°C
Choice4 150 - 200°C
Inspector of Factories (Chemical)
According to ASTM D 93, the Pensky-Martens Closed Cup test is used to
126
determine the flash point of petroleum products over which temperature
range?
Choice1 0 to 100°C
Choice2 40 to 360°C
Choice3 100 to 500°C
Choice4 20 to 200°C
Inspector of Factories (Chemical)
During preparation of fiber suspension for paper making, pulp is typically
127
water-slurried to fiber content of:
Choice1
1 3
− %
2 4
Choice2
1
1 − 3%
2
Choice3 5 - 10 %
Choice4 10 - 15 %
Inspector of Factories (Chemical)
A crude oil sample has a relatively higher concentration of paraffins. Which
128
property is most likely to be observed?
Choice1 lower viscosity than aromatic crude oils
Choice2 Higher viscosity than aromatic and naphthenic crude oils
Choice3 lower pour point than aromatic crude oils
Choice4 No relationship exists between paraffin content and viscosity
Text of page 38
Inspector of Factories (Chemical)
A process engineer increases the hydrogen concentration in an HDPE slurry
129
loop reactor using a Phillips catalyst while maintaining all other operating
conditions. Which outcome is most likely?
Decreased polymer molecular weight and melt viscosity, although the
Choice1
magnitude of the response depends on the catalyst formulation.
Choice2 Increased molecular weight because hydrogen inhibits chain transfer.
Increased polymer density due solely to hydrogen incorporation into the
Choice3
polymer backbone.
No measurable effect because hydrogen is chemically inert under
Choice4
polymerization conditions.
Inspector of Factories (Chemical)
In the industrial manufacture of urea, ammonia, and carbon dioxide, first react
130
to form:
Choice1 Ammonium Nitrate
Choice2 Ammonium Sulfate
Choice3 Ammonium Carbamate
Choice4 Biuret
Inspector of Factories (Chemical)
The Standard Oil Company (Indiana) process for polyethylene production is
131
typically carried out at:
Choice1 130 - 160 °C and 10-20 atm
Choice2 230 - 270 °C and 40-80 atm
Choice3 90 - 100 °C and 100-150 atm
Choice4 80 - 120 °C and 1000-3000 atm
Inspector of Factories (Chemical)
Mixed fertilizers contain which three primary plant nutrients?
132
Choice1 Nitrogen, Sulfur, and Calcium
Choice2 Nitrogen, Phosphorus, and Potassium
Choice3 Phosphorus, Calcium, and Magnesium
Text of page 39
Choice4 Potassium, Sulfur, and Zinc
Inspector of Factories (Chemical)
Selective acetylene hydrogenation reactor in an ethylene plant is bypassed due
133
to maintenance. What is the most likely consequence?
Choice1 Higher polymer-grade ethylene purity
Increased acetylene concentration in the ethylene product, making it
Choice2
unsuitable for polymerization
Choice3 Increased ethane conversion
Choice4 Reduced refrigeration duty
Inspector of Factories (Chemical)
Which ONE of the following process sequence is used in the sugar industry?
134
Choice1 CaHPO4/Lime treatment → Multiple stage evaporation → Crystallization
Choice2 Crushing → Crystallization → CaHPO4/Lime treatment
Choice3 CaHPO4/Lime treatment → Crystallization → Crushing
Choice4 Multiple stage evaporation → Crystallization → Ca2HPO4/Lime treatment
Inspector of Factories (Chemical)
In the Stengel process, ammonia vapor is preheated at approximately:
135
Choice1 80 - 90°C
Choice2 100 - 110°C
Choice3 140 - 150°C
Choice4 200 - 220°C
Inspector of Factories (Chemical)
When environmental lapse rate exceeds the adiabatic lapse rate, then the
136
atmosphere is:
Choice1 Stable
Choice2 Neutral
Choice3 Unstable
Text of page 40
Choice4 Inversion
Inspector of Factories (Chemical)
Which of the following oxidants has the highest oxidation potential under
137
acidic conditions?
Choice1 Chlorine
Choice2 Hydrogen peroxide
Choice3 O3
Choice4 O2
Inspector of Factories (Chemical)
A worker is exposed to 30 ppm of CO for a sufficiently long period to attain
138
equilibrium. The approximate percentage of carboxyhemoglobin in blood is:
Choice1 2.3%
Choice2 4.5%
Choice3 5.3%
Choice4 6.8%
Inspector of Factories (Chemical)
Which instrument is commonly used to determine the ambient lapse rate?
139
Choice1 Hygrometer
Choice2 Barometer
Choice3 Anemometer
Choice4 Thermometer equipped with balloon
Inspector of Factories (Chemical)
Assertion (A): Alkalinity is commonly reported as mg/l as CaCO3.
140
Reason (R): One milliequivalent of CaCO3 is equal to 50 mg.
Choice1 Both A and R are true, and R is the correct explanation of A.
Choice2 Both A and R are true, but R is not the correct explanation of A.
Choice3 A is true, but R is false.
Text of page 41
Choice4 A is false, but R is true.
Inspector of Factories (Chemical)
What is the primary cause of a radiation (nocturnal) inversion?
141
Choice1 Radiational cooling of the ground at night, cools the air near the surface.
Choice2 Strong solar heating of the ground during the day.
Choice3 Mixing of warm and cold air by strong winds.
Choice4 Advection of warm air over a cold ocean.
Inspector of Factories (Chemical)
Plume rise above the physical stack height is caused by which two effects?
142
Choice1 Atmospheric stability or wind speed
Lower density that the surrounding air or higher momentum of gas mixture
Choice2
the stack.
Choice3 Stack height or atmospheric pressure difference
Choice4 Solar radiation and turbulent diffusion.
Inspector of Factories (Chemical)
Three wastewater samples have the following BOD/COD ratios: Sample P =
143
0.25, Sample Q = 0.55, Sample R = 0.75.
Which sample is expected to contain the highest proportion of biologically
resistant organic matter?
Choice1 Sample P
Choice2 Sample Q
Choice3 Sample R
Choice4 All three have equal biodegradability
Inspector of Factories (Chemical)
Which of the following statements correctly distinguishes adsorption from
144
absorption?
Adsorption is the accumulation of molecules on the solid surface, whereas
Choice1
absorption involves the penetration of molecules into the bulk of material.
Text of page 42
Adsorption involves the penetration of molecules into the bulk of a material,
Choice2
whereas absorption occurs only on the surface.
Both adsorption and absorption involve the penetration of molecules into the
Choice3
bulk of the material.
Choice4 Both adsorption and absorption occur only at the surface of the material.
Inspector of Factories (Chemical)
Which one of the following pollutants contributes simultaneously to acid rain,
145
formation of fine particulate matter (PM2.5) and reduction in atmospheric
visibility?
Choice1 Carbon monoxide (CO)
Choice2 Sulphur dioxide (SO2)
Choice3 Methane (CH4)
Choice4 Ammonia (NH3)
Inspector of Factories (Chemical)
Under which atmospheric condition, the ground-level concentration of
146
pollutants near an emission source is generally the highest, assuming identical
stack height and emission rate?
Choice1 Highly unstable atmosphere (Class A)
Choice2 Neutral atmosphere (Class D)
Choice3 Highly stable atmosphere (Class F)
Choice4 Slightly unstable atmosphere (Class C)
Inspector of Factories (Chemical)
The fundamental principle of membrane separation is based on:
147
Choice1 Differences in the transport rates of components through a selective barrier.
Choice2 Differences in boiling points of the components.
Choice3 Differences in the densities of the components.
Choice4 Differences in the sedimentation velocities of the components.
Text of page 43
Inspector of Factories (Chemical)
Which plume type generally produces the lowest ground-level pollutant
148
concentration in the vicinity of a stack?
Choice1 Fanning plume
Choice2 Looping plume
Choice3 Lofting plume
Choice4 Fumigation plume
Inspector of Factories (Chemical)
The Dry Adiabatic Lapse Rate (DALR) is approximately equal to:
149
Choice1 4.5
∘
C/km
Choice2 C/km
∘
6.5
Choice3 9.8
∘
C/km
Choice4 C/km
∘
12.5
Inspector of Factories (Chemical)
Photochemical smog is primarily produced by the reaction of nitrogen oxides (
150
) and hydrocarbons in the presence of sunlight. Which one of the
following compounds is NOT considered a major constituent of photochemical
smog?
Choice1 Ozone (O 3 )
Choice2 Peroxyacetyl nitrate (PAN)
Choice3 Aldehydes
Choice4 Sulphur dioxide (SO 2 )Official key not published for this paper.
Page 1 of 43
Source: Rajasthan Public Service Commission. Question paper published by Rajasthan Public Service Commission.