APSC JE 2026: Junior Engineer, Public Health Engineering Department (Advt. 27/2025), Chemical Engineering
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0058t TEST BOOKLET
CTTPNTTCET, ENGINEERING
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I No. of Questions : 1OO I
/48-A
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Which of the following flow_metering The function of a pipe reducer is to
instruments is an area meter?
(A) increase the diameter of a pipe
(A) Venturimeter
(B) Rotameter (B) decrease the diameter of a pipe
(C) change tJ:e direction of a pipe
(C) Pitot tube
(D) seal a pipe
(D) Orifice meter
The purpose of a check valve is to
Re;molds'number is the ratio of
(A) viscous forces to gravrty forces (A) regulate fluid pressure
(B) viscous forces to inertial forces (B) control fluid flow rate
(C) inertial forces to viscous forges (C) prevent backflow
(D) inertial forces to gravity forces (D) measure fluid flow
Priming is needed in a 7. What is the advantage of using a
rotary drum filter?
(A) centrifugal pump
(4 High maintenance cost
(B) reciprocating pump
(B) low filtration rate
(C) gear pump
(C) Limited applicability
(D) diaphragm pump
(D) Continuous operation and high
Iiltration rate
Which type of pipe fitting is used to
connect three or more pipes?
The unit of thermal conductivity is
(A) Elbow
(A) w/(m-K)
(B) Coupling
(B) w/(m2-K)
(C) Union
(C) w71m2-x4;
(D) Tee
(D) w/(m-K2)
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9. Baffles in shell-and-tube heat 13. Heat is typically supplied to a tray
exchangers primarily serve to dryer by
(A) increase the mixing of fluid (A) hot air
(B) increase heat transfer area (B) steam
(C) increase heat transfer efficiency (C) electricity
by directing tl'e shell-side fluid
flow
(D) gas
(D) reduce fouling of the tube
surface
14. For separation of a liquid from
multi-component mixture, the unit
10. The thermal conductivity is minimum operation used is
for
(A) absorption
(4 silver
(B) evaporation
(B) chrome-nickel steel
(C) aluminium (C) filtration
(D) carbon steel (D) distillation
11. In a centrifugal pump, cavitation -5. The analysis of fractionating column
occurs when pressure of tl:e impeller is facilitated by the use of quanttty
eye or vane becomes called
(A) more tlran liquid vapour pressure (A) reflux ratio
(B) more than atmospheric pressure (B) friction factor
(C) less than atmospheric pressure
(C) distribution coefficient
(D) less than liquid vapour pressure
(D) thermal diffusivity
12. A multiple-effect evaporator as
compared to a single-effect evaporator t6. Which of the following is a Part of
of ttre same capacity has the bubble-cap assembly?
(A) lower heat transfer area (A) Electric desalter
(B) lower steam economy (B) Riser
(C) higher steam economy
(C) Reflux drum
(D) higher solute concentration in
the product (D) Reboiler
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11- Scaling and salting are common 21. Which of the following mills works
problems of on the principle of combined impact
and attrition?
(A) IC engines
(A) BaIl miII
{B) evaporators
(B) Hammer mill
(C) conveyors
(C) Roller mill
(D) hoppers
(D) Colloidal mill
18. Which of the following laws is not
associated with crushing? 22. For conveying of viscous masses, we
use
(A) Rittinger's law
(4 belt conveyor
(B) Kick's law
(B) screw conveyor
(C) Fourier's law
(C) chain conveyor
(D) Bond's law
(D) apron conveyor
19. Ultrafine grinders operate principally
w 25. Hummer and Rotex are examples of
(A) compression
(A) froth flotadon cells
(B) cutting
(B) filters
{C) impact (C) conveyors
(D) attrition
(D) vibrating screens
2o. Which of the following is nof, a size
reduction device or equipment? 24. Kneading machine is used to mix
(A) Hammer mill (A) dry masses
(B) Gyratory crusher (B) liquid slurry
(C) Cyclone separator (C) viscous masses
(D) Fluid energr mill (D) powdery masses
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The primary soap making reaction is
25. Which of the following is not a
source of surface water? (A) saPonification
(A) River (B) esterilication
(C) hydrolYsis
(B) Well
(D) hydrogenation
(C) Lake
The global warming Potential of a
(D) Pond gas is decided on the basis of
(A) the amount of total long-wave
Soda ash (Na2COi is sYnthesized radiation a greenhouse gas can
primarily through traP
(B) the amount of total long-wave
(A) Bayer's Process radiation a greenhouse gas can
traP in comParison to CO2 over
(B) Haber's Process a period of 100 Years
(C) Solvay Process (C) the amount of total long-wave
radiation a greenhouse gas can
(D) Fischer-TroPsch Process trap in comParison to CH4 over
a period of 100 Years
(D) the amount of total long-wave
27. The most common catalYst used in radiation a gas can trap over a
hydrogenation of vegetable oil is period of 1 Year
(A) platinum
31. The nitrogen comPound with the
(B) nickel largest Production volume in tl:e
world is
(C) iron (A) azidoazide azide
(D) zeolite (B) urea-formaldehYde
(C) ammonia
Which of the following is not a raw (D) melamine-formaldehYde
material for the manufacture of
ordinary glass?
3.2. The first steP in sugar Production
(A) HydrogenisocYanide from sugarcane is
(A) clarification
(B) Soda ash (B) evaPoration
(C) Limestone (C) crystallization
(D) Silica (D) crushing
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The widely used catalyst in tlle 37. Which of the following is
manufacturing of sulphuric acid by aot a
polyester {ibre?
contact process is
(A) platinum (A) Nylon
(B) vanadium pentoxide (B) Terylene
(C) alumina (C) Dacron
(D) silica gel (D) Polyetlrylene terephthalate (pET)
34. Which of the following is a cross_ 38. Which of the following is a type of
linked polymer? synthetic rubber?
(A) Polyester
(4 Polyvinyl chtoride
(B) Polythene
(B) Polyisoprene
(C) Nylon-6
(C) Styrene-butadiene rubber
(D) Bakelite
(D) Latex
The Ziegler-Natta catalyst is used for
the production of Neoprene rubber is chemically
known as
{A) high-density polyethylene
{B) low-density polyethylene (A} butyl rubber
(C) polyvinyl chloride (B) polychloroprene
(D) polystyrene (C) nitrile rubber
(D) polybutadiene
BOD is a measure of
(A) water temperature
Gypsum is used in cement
(B) fluoride content in water manufacturing as a
(C) the amount of orygen micro- (4 strength enhancer
organisms need to break down
organic material in water (B) hardener
(D) the amount of oxygen required (C) catalyst
to chemically ofdize inorganic
compounds in water (D) setting retarder
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41. The Fourdrinier machine is used in 45. The most widely used coagulant for
the manufacturing of suspended impurities from
fft"Jtft-
(A) rubber
(A) alum
(B) sugar
(B) chlorine
(C) cement
(C) calcium sulPhate
(D) paper
(D) bleaching Powder
42. NPK means a #. The octane number of iso-octane is
(A) nitrogenousfertilizer (A) 100
(B) phosPhatic fertilizer (B) s0
(C) mixed fertilizer (c) 2s
(D) liquid feftiTtznr (D) 0
43. Essentiar oil is usuarly obtained bv 47'
tlif;li:il.Ixf#: "lTir!m"T;'
(A) leaching (A 120-140 "C
(B) steam distillation E) 150_270.C
(c) filtration (c) 300_400 "c
(D) evaporation (D) 3O_9O "C
44. Lime-soda treatment of hard water 48. The petroleum product used as a
removes feedstock for producing petro-
chemicals is
(A) temporary hardness
(A) kerosene
(B) permanent hardness
E) diesel
(C) both temPorary and Permanent
hardness (c) lubricant
(D) iron content (D) naPhtha
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49. The most suitable instrument for 53. The maturity of coal can be
measuring the temperature of a understood by its
furnace is
(A) rank
(A) platinumresistance
thermometer (B) volatile matter content
(B) optical pyrometer (C) mineral matter content
(C) thermocouple (D) moisture content
(D) bimetallic thermometer
Humic coal mainly originates from
50. The act of crushing coal until it (A) aquatic habitats
becomes powder is called
(B) terrestrial plant debris
(A) carbonization (C) seawater
(B) gasification (D) animal fats
(C) pulverization
(D) coking The fused cellular porous structure
that remains after removal of free
moisture and volatile matter from
coal is known as
51. The presence of aromatics which
causes abnormal ignition delay in (A) crude
diesel engine is indicated by
(B) wood charcoal
(A) pour point
(C) coke
(B) softening point
(D) kerogen
(C) flash point
(D) aniline point
High aromatic content in
(A) diesel increases its
The process of transformation of number
plant material into coal is
(B) kerosene increases its smoke
(A) carbonization point
(B) metamorphism (C) petrol decreases its octane
number
(C) weathering
(D) petrol increases its octane
(D) sedimentation number
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57. LPG is essentially a mixture of 61. Which of the following API gravity
varying proportions of ranges is typically considered as
light crude oil?
(A) propane and butane
(A) 0'-10" API
(B) methane and ethane (B) 10'-22.3" API
(C) pentane and hexane (c) 22.3"-31" API
(D) methane and pentane (D) Above 31'1" API
58. Assam crude is
Vacuum distillation of crude is
carried out under reduced pressure
to
(4 paraffinic base
(A) increase the boiling point of the
(B) naphthenic base fraction
(C) mixed base (B) increase the yreld of light
fractions
(D) asphalt base
(C) decrease the boiling point of the
fraction
59. The viscosity of an oil is the measure (D) reduce the viscosity of crude oil
of its
(A) combustion quality Coke oven gas mainly consists of
(B) resistance to flow (A) CHa and H2
(C) oxidation stability (B) CO and N2
(C) H2 and N2
(D) sulphur content
(D) CO and CO2
Good quality kerosene exhibits smoke
point of Heat of combustion of methane is
around
(A) 1O-15 mm (A) 120 MJ/m3
(B) 20-25 mm (B) 65 MJ/m3
(C) 3G-40 mm (C) 12 MJ/m3
(D) 4G-5O mm (D) 37 MJ/ms
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55. Which of the following gaseous fuels 69. The main product of anaerobic
extribits the highest gross calorilic digestion is
value on per m3 basis?
(A) bioethanol
(A) sewage gas
F) biogas I
(B) LPc
(C| biodiesel
(C) producer gas
(D) syngas
{D) Natural gas
70. Which of tl:e following is a
66. rhe sas which contributes ure- ::ffi:,*'""HiX",Iinn fll""""B",l3
maximum to ttre heating value of into saturated hydrocarbons in
natural gas is petroleum industryi
(A) co (e; oxidation
(B) COz (B) Dehydrogenation
(c) cH+ (C) Hydrogenation
(D) H2 (D) Aromatization
62. The composition of water gas or blue 71. The chemical method for processing
gas is oilseeds such as groundnut, soybean
and rapeseed is
(4 H2 and co
(o; absorption
(B) H2 and CrIlu
(B) hydrolysis
(c) cHa and c2H6
(c) pol5rmerization
(D) cHa and H2
1D) solvent extraction
68. One of the examples of non- 72. The main purpose of t]1e Kraft
renewable enerry source is pulping process is to
(A) bioenergr (A) bleach the pulp
(B) wind enerry (B) remove [gnin from wood fibres
(C) enerS/ from tides (C) produce mechanical pulp
(D) nuclear enerry from uranium (D) recycle paper
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73. Which of the following fertilizers is a 77. A graphic recorder is
key component in the production of
reiirr" and plastics? (A) analog t5rpe recorder
(A) Ammonium sulfate (B) digital type recorder
(B) Ammonium nitrate (C) return-to-zero type recorder
(c) potassium nitrate (D) non-return-to'zero type recorder
(D) Urea
78. The bulbs of filled system thermo-
meters are usually made uP of
74. One of the major residues of sugar-
cane industry which can also be (A) rubber
used as a valuable feedstock for
biofuels production is
(B) iron
(A) molasses (C) Plastic
(B) spent lye (D) stainless steel
(C) bagasse
(D) sucrose 7e' principle of a thermopile
f;":$-jl-
(A) Joule's law of heating
75. Lime is used as basic flux in the (B) Stefan-Boltzmann law
manufacture of
(4 steel (C) Seebeck effect
(B) brass (D) ohm's law
(C) bronze
(D) aluminium 80. The resistance of an NTC (Negative
Temperature Coefficient) thermistor
(A) increases with increase in
76. Which of the following is a typical temperature
example of composition analyzer?
(B) decreases with increase in
(A) Thermocouple temperature
(B) Gas chromatograph (C) remains constant with
temperature
(c) Pitot tube
(D) varies randomry with
(D) Bourdon tube temPerature
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81. The Reaumur scale is based on the In radiation level detector, when the
freezing and boiling point of water at tiquid level in the tank rises, the
amount of radiation received by the
(A) -32" R' and 60' R' detector
(B) 0" R' and 60" R'
(A) is increased
(C) 0o R' and 80' R'
(B) is reduced
(D) 10o R' and 80' R'
(C) is unchanged
In a C-type Bourdon tube, tJre cross- (D) remains constant
section of the tube is generally
(A) circular
(B) oval or elliptical Self-operated controllers work (to
automatically adjust a valve) by
(C) square using the
(D) triangular
(A) external electrical power
83. Absolute pressure is equal to (B) external mechanical gears
(A) gauge pressure + atmospheric (C) energ/ from process medium
pressure (e.g., temperature and pressure)
(B) gauge pressure - atmospheric
pressure (D) battery power
(C) atmospheric pressure only
(D) gauge pressure only
47. The 'dead-end' type self-operated
pressure regulator differs from the
'flow type'by having no
Variable head flow meters work on
the principle of
(A) relief valve
(A) Pascal's law
(B) extra spring adjustment
(B) Newton's second law
(C) Boyle's law (C) float mechanism
(D) Bernoulli's theorem (D) thermostat bulb
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88. Automatic control is the main- 92. A mechanical transducer itself can
tenance of a desired value directly provide output solely in the
form of
(A) by using open-loop a{ustment
(Al displacement or movement
(B) by manually adjusting setpoint
(c) without correcting the differences (B) voltage
(D) by measuring, comparing and (c) current pulses
correcting the differences
(D) Iight intensity
89. In two-position control, the
manipulated variable is changed to 99. If the air supply above ttre
valve
(A) continuous intermediate values 95*11:T.^:t-
lzrfls, T,,"o-to-close
tne valve w1ll
(B) either maximum or minimum
value (A) fail closed
(C) only proportional values (B) fail open
(D) random values depending on (C) remain at last position
disturbance
(D) burst due to spring force
90. Feedback control generally does not
improve 94. consider the following statements
(A) stability about derivative control :
(B) accuracy (il It predicts actuating errors
before they evolve.
(C) performance
(D) measurement of disturbances
(ii) It improves the stability of the
- sYstem.
(iii) Its output will be constant (but
91. A passive transducer not zero) when error is constant.
(A) self-generates electrical output Which statements are correct?
from input energl
(A) only (i) and (ii)
(B) requires mechanical movement
onlY 1e) Onty (ii) and (rii)
(C) requires an external electrical (C) only (i) and (iii)
source
(D) requires optical input only (D) (il' (ii) and (iii)
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Text of page 14
95. Which of the following parameters is 98. 1 torr is equal to
required for calculation of Reynolds'
number for a fluid flowing through a (A) 100 microns
cylindrical pipe?
tB) I mm of Hg
(A) Acceleration due to gravity (g)
(C) 14.5 x 10-s psi
(B) Specific heat at constant (D) 10{ mm of Hg
pressure
(c) Molar mass of the fluid
,(D) Density of the fluid 99. Consider the following statements
about reproducibility of instruments :
(1) It refers to degree of agreement
96. Which of the following statements between multiple measurements
about float type level indicator is not of the same quantity.
correct?
(ii) High reproducibility indicates
(A) A float rests on the liquid that the instrument's perform-
surface and follows the ance is stable and reliable over
changing level of liquid. time.
(B) Float is made of corrosion- (iii) Perfect reproducibility ensures
accuracy over a short period of
resisting materials such as time.
stainless steel.
Which statements are correct?
(C) Float type level indicators are
suitable for highly viscous (A) only (il and (ii)
liquids.
(B) only (ii) and (iii)
(D) Floats can be hollow spheres, (C) only (r) and (iii)
cylinders, or discs.
(D) (1), (ii) and (iii)
97. The Mcleod gauge works on the
principle of
1OO. Which of the following controllers is
(A) ionization of residual gases most sensitive and responsive to
noise?
(B) heat transfer in gases
(A) Proportional
(C) elastic deformation of
diaphragm
(B) On-off
(D) compression of a lanown volume (C) Derivative
of gas (D) Integral
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SPACE FOR ROUGH WORK
***
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Text of page 1
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ASISAIUI PI.l BLIC SER.\'ICE CO]T,I ]'IISISIOnI
Jawah arna g a r, Kh a na pa ra, c u lva h ati-7 87-O22.
Provisional Answer Key of Screening Test (OMR based MCQ type) for the post of
Junior Engineer (Civil/ MechanicaU Chemical/ Electrical)
under Public Health Engineering Department.
(Advt. No. 27 12025 Dtd. 1110812025)
Date of Examination: 22.02.2026
(Paper-II) CHEMICAL ENGINEERING
A
100 Time: 2:00 hours
Q.NO. ANS KEY Q.NO. ANS KEY Q.NO. ANS KEY Q.NO. ANS KEY
1 B 26 C 51 D 76 B
2 C 27 B 52 A 77 A
1
J A 28 A 53 A 78 D
4 D 29 A 54 B 79 C
5 B 30 D 55 C 80 B
6 C 31 C 56 D 81 C
7 D 32 D 57 A 82 B
8 A JJ B 58 C 83 A
9 C 34 D 59 B 84 D
10 B 35 A 60 B 85 B
11 D 36 C 61 D 86 C
t2 C 37 A 62 C 87 A
13 A 38 C 63 A 88 D
14 D 39 B 64 D 89 B
t5 A 40 D 65 B 90 D
t6 B 4t D 66 C 9t C
l7 B 42 C 67 A 92 A
18 C 43 B 68 D 93 B
l9 D 44 C 69 A 94 A
20 C 45 A 70 C 9s D
2l A 46 A 71 D 96 C
22 B 47 B 72 B 97 D
23 D 48 D /) D 98 B
24 C 49 B 74 C 99 A
25 B 50 C 75 A 100 C
Text of page 2
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AS=IAIyI PI' E LI C S E R.I'I G E GO I'JI ]|{ I nl
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Provisional Answer Key of Screening Test (OMR based MCQ type) for the post of
Junior Engineer (CiviU Mechanical/ ChemicaU Electrical)
under Public Health Engineering Department.
(Advt. No. 27 12025 Dtd. 1110812025)
Date of Examination: 22.02.2026
Subiect: (Paper-II) CHEMICAL ENGINEERING
Series: B
Marks: 100 Time: 2:00 hours
Q.NO. ANS KEY Q.NO. ANS KEY Q.NO. ANS KEY Q.NO. ANS KEY
1 D 26 B 51 D 76 D
2 C 27 A 52 C 77 B
a
J A 28 C 53 B 78 C
4 B 29r B 54 C 79 D
5 A 30 C 55 B 80 A
6 D 31 A 56 A 81 A
7 C 32 D 57 A 82 B
8 B JJ B 58 D 83 C
9 C 34 C 59 C 84 D
10 B 35 D 60 D 85 A
11 A 36 A 6l B 86 C
t2 D 37 C 62 D 87 B
13 B 38 B 63 A 88 B
1,4 C 39 D 64 C 89 D
15 A 40 C 65 A 90 C
T6 D 4t A 66 C 9t A
T7 B 42 D 67 B 92 D
18 D 43 A 68 D 93 B
I9 C 44 B 69 D 94 C
20 A 45 B 70 C 95 A
21 B 46 C 71 B 96 D
22 A 47 D 72 C 97 A
23 D 48 C 73 A 98 C
24 C 49 A 74 A 99 D
25 D 50 B 75 B 100 B
Text of page 3
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ASilSAIrrt P1t ELIC SER.ITICE COt4 lt,tr=islonl
l(tran apara, Gu lval-rati-78
Provisional Answer Key of Screening Test (OMR based MCQ type) for the post of
Junior Engineer (CiviU MechanicaU ChemicaU Electrical)
under Public Health Engineering Department.
(Advt. No. 27 12025 Dtd. 1110812025)
Date of Examination: 22,02.2026
Subiect: (Paper-II) CHEMICAL ENGINEERING
Serigs: C
Marks: 100 Time: 2:00 hours
Q.NO. ANS KEY Q.NO. ANS KEY Q.NO. ANS KEY Q.NO. ANS KEY
I D 26 C 51 C 76 B
2 C 27 A 52 A 77 B
a
J B 28 D 53 B 78 C
4 C 29 A 54 A 79 D
5 A 30 C 55 D 80 C
6 A 31 D s6 C 8t A
7 B 3Z B 57 D 82 B
8 D JJ D 58 B 83 D
9 B 34 C 59 A 84 C
l0 C 35 A 60 C 85 B
11 D 36 B 6t B 86 C
12 A 37 A 62 C 87 B
13 A 38 D 63 A 88 A
t4 B 39 C 64 D 89 A
15 C 40 B 65 B 90 D
t6 D 4t C 66 C 9t C
l7 A 42 B 67 D 92 D
18 C 43 A 68 A 93 B
t9 B 44 D 69 C 94 D
20 B 45 B 70 B 95 A
21 D 46 C 7l D 96 C
22 C 47 A 72 C 97 A
23 A 48 D t5 A 98 C
24 D 49 B 74 D 99 B
25 B 50 D 75 A 100 D
Text of page 4
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Provisional Answer Key of Screening Test (OMR based MCQ type) for the post of
Junior Engineer (CiviU MechanicaU ChemicaU Electrical)
under Public Health Engineering Department.
(Advt. No. 27 12025 Dtd. 1110812025)
Date of Examination: 22.02.2026
Subiect: (Paper-II) CHEMICAL ENGINEERING
Series: D
Marks: 100 Time: 2:00 hours
Q.NO. ANS KEY Q.NO. ANS KEY Q.NO. ANS KEY Q.NO. ANS KEY
1 C 26 D 51 B 76 D
2 B 27 A 52 B 77 B
J D 28 C 53 D 78 C
4 C 29 A 54 C 79 A
5 A 30 C 55 A 80 D
6 D 31 B 56 D 81 B
7 A 32 D 57 B 82 D
8 B 35 D 58 C 83 C
9 B 34 C 59 A 84 A
10 C 35 B 60 D 85 B
11 D 36 C 6l A 86 A
12 C 5t A 62 C 87 D
13 A 38 A 63 D 88 C
t4 B 39 B 64 B 89 D
15 D 40 D 65 D 90 B
16 C 41 B 66 C 9t A
17 B 42 C 67 A 92 C
18 C 43 D 68 B 93 B
19 B 44 A 69 A 94 C
20 A 45 A 70 D 95 A
2t A 46 B 71 C 96 D
22 D 47 C 72 B 97 B
23 C 48 D t) C 98 C
24 D 49 A 74 B 99 D
25 B 50 C 75 A 100 APage 1 of 16
Source: Assam Public Service Commission. Question paper published by Assam Public Service Commission.