APSC JE 2024: Junior Engineer, Public Health Engineering Department (Advt. 29/2023), Chemical Engineering
Text of page 1
JE/PHE lCynlfil24
DO NOT OPEN THIS TEST BOOKLET UNTIL YOU ARE ASI{ED TO DO SO
Test Booklet No. : Series
0048L
TimeAllowed:2Hours
TEST BOOKLET
Paper-II
CTTpTTCEL ENGINEERING
Read, the followtng lnstructlons carcfullg beJore gou begln to o;ftsu)et tfte guestlons :
B
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t49 [ No. of Questions : 1OO
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1. The unit of viscosit5r in the CGS 5. The valve used to control the flow of
system is a fluid in a pipeline is
{A} stokes (A) gate valve
(B) poise (B) needle valve
(C) coulomb
(C) check valve
(D) dyne
(D) globe valve
2. The important relation that can be
derived by applying the momentum 6. Check valve is a t5rpe of
balance to the steady flow of a fluid
in potential flow without friction is (A) pressure relief valve
(A) equation of state (B) pressure reducing valve
(B) Fick's law (C) unidirectional control valve
(C) Bernoulli equation (D) None of tJ:e above
(D) Arrhenius equation
The SI unit of heat transfer
The device to measure the local coefficient is
velocit5r along a streamline is a/an
(A) J lm2 x
(A) pitot tube
tB) w/m2 K
(B) venturi meter
(c) w/m K
(C) orifice meter
(D) J/m K
(D) rotameter
8' Which of the following has maximum
4. The fitting for connecting branch
thermal conductivit5r?
lines is
(A) Iron
H plug
{B) socket (B) Coal
{C) tee (C) Nitrogen
(D) cap (D) Tar
JE/PHE/CHlfi/2414e-A 2
Text of page 3
9. In a distillation column, all plates 13. As the reflux ratio decreases, the
above the feed plate constitute the
(A) separation becomes more
(A) rectiffing section eflicient
tB) stripping section (B) number of plates decreases
(C) reflux (C) column diameter increases
(D) reboiler (D) None of the above
Distillation of crude oil is an The use of pulverized coal in boiler
example of furnace provides
(A) steam distillation (A) high calorific value
(B) fractional distillation (B) better combustion
(C) azeotropic distillation (C) smokeless burning
(D) extractive distillation (D) less erosion on furnace walls
11. A common apparatus used in gas 15. Which of the following has the
absorption is
highest calorific value?
(A) evaporator
(A) Lignite
(B) distillation column
(B) Sub-bituminous coal
(C) heat exchanger
(C) Anthracite
(D) packed column
(D) Peat
12. Berl saddle and Raschig rings are
examples of 16. Reynolds'number is the ratio of
(A) building materisls (A) viscous forces to gravity forces
(B) packing materials (B) inertial forces to viscous forces
(C) plastic materials (C) viscous forces to inertial forces
(D) adhesives (D) inertial forces to gravity forces
JE/PHE/C}Ilrr/24149-A lP.T.O.
Text of page 4
17. Primary is necessary in which of the 21. The two-phase mixture of mother
following pumps? liquor and crystals of all sizes,
which occupies the crystallizer and
(A) Reciprocating is withdrawn as product, is called
{B} Gear (A) magma
tC) Centritugal {B) sludge
(D) Diaphragm (C) nucleus
(D) lattice
The sweetland filter is a later
development of the
Crystallization is the formation
(A) plate-and-frame filter solid particles within a
(B) vacuum filter (A) heterogeneous phase
(C) pressure leaf filter (B) homogeneous phase
(D) sand filter (C) multilayer phase
(D) monolayer phase
19. The speed of rotation of the rotary-
drum filter is usually
23. Crystal growth is a/an
(A) equal to 2 r.p.m.
(A) absorption process
tB) more than 1 r.p.m. (B) distillation pnocess
(C) more than 2 r.p.m. (C) diffusion proeess
(D) less than I r,p,m. (D) adsorption process
2O. The filter medium used in the rotaqr- 24. The type of dryer used for making
drum filter is milk powder is a
(A) sand (A) tray dryer
(B) cioth (B) spray dryer
(C) gravel (C) rotar5r dryer
(D) charcoal (D) vacuum dryer
JE/PHE/cHltrl24l+e-A +
Text of page 5
25. For sensitive materials that cannot 29. The type of grinding mill used in
be heated to the boiling point at cement industry is
atmospheric pressure, the dryer
used is a/an (A) hammer mill
(A) tray dryer F) tumbling mill
(B) atmospheric dryer (C) tube ball mill
(C) vacuum drum dryer (D) conical mill
{D) festoon dryer
3O. Standard screens are specified
by the
25. Comminution is a generic term for
(A) size separation (A) diameter of the wire
(B) conveying (B) mrmber of meshes per inch
(c) sedimentation (c) Both (A) and (B)
(D) size reduction (D) None of the above
27. Amorerealisticmethodof estimating 31. One of the well-known t3pes of
the power required for crushing and vibrating screen is the
grinding was given by
(A) hummer
(A) Bond's law
(B) gt'rzzly
{B) Fourier's law
(c) trommel
(c) Fick,s law
(D) cYclone
(D) Boyte's law
28. The most vgrsatile of all the grinding 32 mixer is a modilication
"firy
miils is the
(A} ball milt tA) dry mixer
{B)hammermill(B)kneadingmachine
(C) tube mill {C) V-tYPe mi:rer
(D) Hardinge mill (D) Pug mill
JE/PHE/cHlrrl24l4e-A 5 [P.T.O.
Text of page 6
33. Scrapper and apron are examples of 37. Lime is used as a basic flux in the
manufacture of
(A) belt conveyors
{A) steel
(B) chain conveyors
(B) brass
(c) screw conveyors
tc) bronze
(D) pneumatic conveJrcrs
(D) aluminium
34. Screw conveyor is used for the Sg. The unit process to remove double
transportation of bonds in the fat and oil industry is
(A) thin liquids (A) oxidation
(B) dry solids (B) calcination
(C) pasty solids (C) hydrogenation
(D) hearSr particles tD) hydrolysis
se' rh1 removal 0f soluble gas from a
35. Froth flotation is the most suitable solution by counter-current contact
method for treating
with an inert gas is called
(A) iron ores (A1 evaporation
(B) sulphide ores (B) adsorption
(C) quartzite (C) crystalliza.tion
{D} None of the above (D) stripping
36. The most common gpe of cement 4o' The nitrogen compound with the
is the largest production volume in the
world is
{A) high alumina cement (A1 melamine_formaldehyde
(B) Portland cement (B) urea-formaldehyde
(C) blast furnace slag cement (C) urea
(D) hydraulic-lime cement (D) None of the above
JE/PHE/cHlrU24l4e-a 6
Text of page 7
41. The continuous chemical process 45. Most widely used catalyst in the
for processing oil seeds such as manufacture of sulphuric acid by
groundnut, soya bean and rape- contact process is
seed is
(A) platinum
(A) adsorption
(B) vanadium pentoxide
(B) hydrolysis
(C) alumina
(C) polymerization
(D) solvent extraction (D) silica gel
42. Direct saponification using strong 46. In municipal water treatment,
caustic in batch process operation filtration is carried out by using a
is the oldest type of the
manufacture of (4 sand filter
(A) soap (B) charcoal filter
(B) edible oils (C) settling tank
(C) paints (D) None of the above
(D) varnish
47. Solvay process is used for the
43. Bagasse and molasses are by- manufacture of
products of which of the following
industries?. (A) chlorine
(A) Cement (B) soda ash
(B) Sugar (C) caustic soda
(C) Soap (D) sodium chloride
(D) Paper
48. The Fourdrinier machine is used in
44. Which of the following is not a the manufacture of
polymerization reaction?
(A) rubber
(A) Bulk
(B) Solution (B) sugar
(C) Emulsion (C) cement
(D) Hydrogenation (D) paper
JE/PHE/cHlrU24l4e-A lP.T.o.
Text of page 8
49. The polyolefin plastic that has the 53. Blue vitriol is chemically
largest production is
(A) copper sulphate
(A) polypropylene
(B) ferrous sulphate
(B) polyethylene
(C) copper nitrate
(C) polyvinyl chloride
(D) aluminium sulphate
(D) polyester
54. The nitrogen content of ammonium
5O. The monomers that form SBR are nitrate is
(A) sodium and butadiene (A) 2OVo
(B) st5rene and bromine (B) 3s%
(C) silicon and bromine {c) 45o/o
(D) stJrrene and butadiene (D) 6o0/o
55. The main constituent of natural gas
51. Baking soda is chemically
is
represented by
(A) methane
(A) Na2Co3
(B) ethane
(B) NaHCO.
(C) propane
(C) NarCO3'H2O
(D) butane
(D) Na2CO3.1OH2O
56. Polfietralluoroethylene (PTFE) is
52. Neoprene is the trade name of known as
(A) polyamide (A) Bakelite
(B) phenol formaldehyde tB) ?eflon
(C) po\rchloroprene (C) Celluloid
(D) sBR (D) Dacron
JE/PHE/CHlrrl24l4e-A 8
Text of page 9
57. Vulcanization of rubber 61. The percentage of CO in flue gas is
determined by
(A) improves elasticity
(A) spectrometer
(B) improves hardness
(B) Orsat gas analyzer
(C) increases resistance to organic
solvents (C) Polarimeter
(D) All of the above (D) polarograph
58. Dacron is an example of 62. Rank of coal indicates the
(A) polyester (A) ash content
(B) polyethylene (B) moisture content
(C) polyamide (C) maturity of coal
(D) synthetic rubber (D) None of the above
59. The percentage of alcohol in beer 63. Natural gas containing high amount
may be around of recoverable condensate is called
(A) Oo/o-Lo/o (A) drY natural gas
(B) 2o/o-8o/o F) water gas
(C) l8o/r23Yo (C) wet natural gas
(D) 27o/o-32o/o (D) blue gas
6O. Sulphuric acid is mainly used in the 64. The predominant compound in the
manufachrre of blast furnace gas is
(A) fertilizers (A) co
(B) steel (B) H2
(C) paper (c) N2
(D) paint (D) 02
JE/PHE/cHlrr/2414e-A 9 lP.r.o.
Text of page 10
65. When air comes in contact with 68. Aviation gasoline has octane number
ignited solid amorphous carbon, it
results in the formation of (A) less than 5O
(A) producer gas
(B) equal to 5O
(B) blue gas
(C) less than IOO
(C) water gas
(D) equal to 100
(D) biogas
69. The undesirable component in
The gas produced by the degradation kerosene is
of biological matter by the action of
anaerobic bacteria in the absence of (A) aromatic
free oxygen is
(B) naphthene
(A) natural gas
(B) biogas {C) paraffin
(D) benzene
(c) LPG
(D) cNG
7O. The lowest temperature at which
vapours given off by the oil ignites
and. continues to burn for at least
67. The range of temperature 5 seconds when a small flame is
maintained in electrical desalting of
brought near to it, is
crude oil is
(A) 1OO "C-12O "C (A) flash point
tB) 120 "C-130 "C {B) cloud point
(c) 15O "C-180 .C (C) smoke point
(D) 2OO'C-230 oC (D) fire point
JE/PHE/cH/il/2414e-A 10
Text of page 11
71. The apparatus used for measuring 75. Tachometer measures the
flash point below 50'C is
(A) flow rate
(A) Pensky-Martens
(B) composition
(B) Abel's apparatus
(C) speed (r.p.m.)
(C) Cleveland
(D) pressure
tD) Ring and Ball
?6. In Fourier's law, the proportionality
72. The carbon residue of an oil is constant is called the
determined by
(A) heat transfer coefficient
(A) smoke point
(B) thermal diffusivity
(B) bomb calorimeter (c) thermal conductivity
(c) Ramsbottom test
1D) stefan-Boltzmann constant
(D) Abel's apparatus
77. Baffles are provided in heat
exchangers to
73. Renewable energr resources include
(A) increase the fouling factor
(A) sunlight
(B)wind(B)decreasetheheattransferarea
(C) increase the heat transfer
(c) geothermal heat coefficient
(D) All of the above
tD) increase the heat transfer rate
74. Temperatures in "F and K are the Zg. perfect reproducibility means the
same at instrument has
{A) o (A) no drift
(ts) 212 (B) point drift
(c) s74.6 (C) load drift
(D) 273.\s (D) calibration drift
JE/PHE/CHlrU24l49-A 11 lP,T.O.
Text of page 12
79. Which of the following is/are 83. Thermocouples employ two
undesirable characteristic(s) of an
instrument? (A) dissimilar metal wires
{A} High fidelity (B) dissimilar metal strips
(B) High reproducibility (C) similar metal wires
(c) High measuring lag
1D) similar metal strips
(D) Both {A) and {B)
84. Which one of the following is a solid
8O. Transducers may be classified expansion thermometer?
according to their
(A) Bimetallic thermometer
(A) method of energr conversion
(B) $rometer
(B) nature of output signal
(c) ThermocouPle
{c) application
(D) A11 of the above (D) None of the above
81. I atmospheric pressure in terms of 88. Orifice plates are usually made of
psi at mean sea level is
(A) wood
(A) 12'6e
(B) Plastic
tB) 14'6e
(C) 16'69 (C) ceramic
(D) 18'69 (D) stainless steel
82. What is the purpose of a sight glass g6. The working principle of mercury in ,
in a boiler system? ghss thermometer is
-' To
{A)
\- monitor
.::"^**'
electrical
(A) volumetric e:rpansion
conductivity
tB)Tomonitorflowrate(B)pressurerisewithtemperature
{c) To obsenre water level (c) linear expansion
(D) To measure steam temperature (D) None of the above
JE/PHE/CHlrrl24l4e-a L2
Text of page 13
87. Which of the following is not a 91. Theoperationof arotameterisbased
mechanical pressure-sensing on
element?
(A) variable area flow
(A) Bellow
(B) rotation of turbine
(B) Diaphragm
(C)Bourdontube(C)pressuredropacrossanozzle
(D) U-tube manometer (D) pressure at a stagnation point
88. On-off controllers are normally used 92. ln a vortex flow meter, what is the
for relationship between frequency of
vortices and fluid-flow rate?
(A) low roads
(B) temperature changes (A) Directly proportional
(C) flow-rate changes E) Inversely proportional
(D) None of the above (C) Constant
(D) No relationship
89. How does resistance of a Negative
Temperature Coefficient (NTC)
thermistor change with increase in 93. Strip chart recorder is a/an
temperature?
(A) oscillographic recorder
(A) lncreases
(B) non-analog recorder
(B) Decreases
{C) Increases exponentially (C} graphic recorder
(D) Remains constant (D) magnetic-tape recorder
9O. Gas chromatography is used for the 94. Set-point of a system is also called
measurement of
(A) disturbance
(A) temperature
(B) pressure (B) desired value
(C) flow rate (C) measured value
(D) concentration (D) manipulated value
JE/PHE/C}llrrl24l4e-A 13 lP.T.O.
Text of page 14
95. In proportional control, the output of 98. Final control elements receive srgnal
the controller is from a controller and adjust
accordingly the value of the
(A) directly proportional to set
pourt(A)controlledvariable
(B) process variable
(B) directry proportional to error
(C) load variable
(C) inversely proportional to set
point (D) maniPulated variable
(D) inversely proportional to error
99. Which of the following characterizes
the distributed control system?
96. Reset control action is also known as (A) Distributed processing
(B) Distributed data
(A) two-position control action
(C) Distributed control
(B) proportional control action
(D) All of the above
tC) integral conEol action
1OO. Proeess instrumentation diagram
(D) derivative control action provides
tA) process flow diagram
97. What type of control action does (B) schematic layout of the process
a self-operated level
typicauy provide?
"orrt.ou",
#["1f:'"ffX$:j-:f,jJ .
(A) on-off control (c) requisites for process system
analysis and equipment
(B) Derivative control specifications
(D)
(c) proportionat control ::::,T:::- ^fft^-
speclncauon or ^:::jan(r
tne process
plant equipment but together
(D) Integral control with instmmentation equipment
JE/PHE/CH|[U24|49-A t4
Text of page 16
SPACE FOR ROUGH WORK
***
JElPHE/CH/fi/2414e-A 16 24T-125x4
Text of page 1
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Provisional Answer Key of OMR based Screening Test for
recruitment to the post of Junior Engineer (Civil, Mechanical, Electrical, Chemical) Public
Health Engineering Department
held on 14.07 .2024
(Advt. No.29l2023 dated 31.10.2023)
Subiect: Paper - II (CHEMICAL ENGINEERING)
Series: A
Marks: 100 Time: 2:00 hours
Q.NO. ANS KEY Q.NO, ANS_KEY Q. NO. ANS KEY Q.NO. ANS-KEY
I B )A D 51 B 76 C
2 C 2'.7 A it C 77 C
) A 28 B 53 A 78 A
4 C 29 C 54 B 79 C
5 D 30 C 55 A 80 D
6 C 31 A 56 B 8l B
l B 32 B 57 D 82 C
8 A 33 B 58 A A
9 A 34 C 59 B 84 A
10 B 35 B 60 A 85 D
11 D 36 B 61 B 86 A
12 B )t A 62 C 87 D
13 B 38 C 63 C 88 A
14 B 39 t) 64 C 89 B
15 C 40 C 65 C 90 D
16 B 41 t) 66 B 91 A
1l C 12 A 67 B 92 A
18 C 43 B 68 D 93 C
19 D 44 D 69 A 94 B
20 B 45 B 70 D 95 B
21 A 46 A 71 B 96 C
22 B 47 B 72 C 97 C
l't C 48 D 13 D 98 D
24 B 49 R C 99 D
ZJ C 50 D '75 C 100 D
Text of page 2
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A.sisiatlt PlrBLrG sEL\rlcE ccr lrt lel I ltsr o nl
Provisional Answer Key of OMR based Screening Test for
recruitment to the post of Junior Engineer (Civil, Mechanicaln Electrical, Chemical) Public
Health Engineering Department
held on 14.07 .2024
(Adrt. No.29l2023 dated 31.10.2023)
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
I B 20 C 51 A 76 A
2 C 27 C 52 B 11 B
3 D 28 D )J C 78 D
4 C 29 D 54 B 79 B
5 C 30 D 55 C 80 D
6 C 31 B 56 D 81 II
7 C 32 C 57 A 82 C
8 A 33 A 58 B 83 A
9 C 34 C 59 C 84 B
10 D 35 D 60 C 85 A
11 B 36 C 61 A 86 B
12 C B 62 B 87 T)
13 A 38 A 63 B 88 A
14 A 39 A 64 C 89 B
15 D 40 B 65 B 90 A
16 A 41 D 66 B 91 B
t7 D 42 B 67 A 92 C
18 A 43 B 68 C 93 C
19 B 44 B 69 D 94 C
20 D 45 C 70 C 95 C
21 A 46 B 71 D 96 B
22 A 47 C 72 A 97 B
23 C 48 C 13 B 98 D
24 B 49 D 74 D 99 A
25 B 50 B 75 B 100 D
Text of page 3
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Provisional Answer Key of OMR based Screening Test for
recruitment to the post of Junior Engineer (Civit, Mechanical, Electrical, Chemical) Public
Health Engineering Department
held on 14.07 .2024
(Advt. No.29l2023 dated 31.10.2023)
Subiect: Paper - II (CHEMICAL ENGINEERING)
Series: C
Marks: f00 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 A 76 B
2 A 27 B 52 A 77 C
3 B 28 D 53 C 78 C
4 D 29 A 54 B 79 D
5 B 30 D 55 B 80 B
6 A 3l ts 56 C 81 A
7 B 32 C 57 C 82 B
8 D 33 D 58 D 83 C
o B 34 C 59 D 84 B
10 D 35 C 60 D 85 C
11 B 36 C 61 B 86 D
12 C 37 C 62 C 87 A
13 A 38 A 63 A 88 B
t4 B 39 C 64 C 89 C
15 A 40 D 65 D 90 C
16 B 4l B 66 C 91 A
17 D 42 C 67 B 92 B
18 A 43 A 68 A 93 B
19 B 41 A 69 A 94 C
2o A 45 t) 70 B 95 B
2t B 46 A 71 D 96 B
22 C 47 D 12 B 97 A
-2. ) C 48 A 13 B 98 C
24 C 49 B 74 B 99 D
25 C 50 D 75 C 100 C
Text of page 4
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Provisional Answer Key of OMR based Screening Test for
recruitment to the post of Junior Engineer (Civil, Mechanical, Electrical, Chemical) Public
Health Engineering Department
held on 14.07 .2024
(Advt. No.29l2023 dated 31.10.2023)
Subiect: Paper - II (CHEMICAL ENGINDERING)
Series: D
Marks: 100 Time: 2:00 hours
Q, NO. ANS KEY Q. NO. ANS-KEY Q.NO. ANS KEY Q.NO. ANS-KEY
I A 26 A 51 B 76 C
2 ts 27 B )l C 77 C
3 C 28 D 53 D 78 D
4 B 29 B 54 C 79 D
5 C 30 D 55 C 80 D
6 D 3l B 56 C 81 B
7 A 32 C 57 C 82 C
8 B 33 A 58 A 83 A
9 C ts 59 C 84 C
10 C 35 A 60 D 85 D
11 A 36 B 61 u 86 C
t2 B 37 D 62 C 87 B
13 B 38 A 63 A 88 A
1.4 C 39 B 64 A 89 A
15 B 40 A 65 D 90 B
16 B 4\ B 66 A 91 D
A1 t) I}
17 A C 67 92
l8 C 43 C 68 A 93 B
19 D 44 C 69 B 94 B
20 C 45 C 10 D 95 C
2l D 46 B 71 A 96 B
22 A 47 B 72 A 97 C
23 B 48 D 73 C 98 C
24 D 49 A 74 B 99 D
25 B 50 D 75 B 100 BPage 1 of 16
Source: Assam Public Service Commission. Question paper published by Assam Public Service Commission.