APSC Assistant Engineer 2024: Assistant Engineer, Public Health Engineering Department (Advt. 28/2023), Chemical Engineering
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AE/PHE/CHltU24
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l. The main components present Effective porosity is
cement are
(4 0= bore volume)/(bulk
(A) MgO, SiO2 and K2O volume)
(B) CaO, SiO2 and AlrO.
(B) O = (total pore vohrme)/ (bulk
(C) CaO, MgO and KrO volume)
(D) Al2O3, Mgo and SiO2 (C) 0= {(bulk volume) - (grain
volume))/ (bulk volume)
2. Rotary kiln used in cement (D) O= (interconnected pore
manufacturing is volume)/ (bulk volume)
(A) longer in dry process
(B) shorter in wet process The presence of a fracture in roek
(C) longer in wet process (A) drastically increases its
permeability and only slightly
(D) None of the above
affects the porosity
3. According to 81S10500:1991, the (B) drastically increases its
required limit of Cr6+ in potable permeabilit5r
water is
(C) drastically decreases its
(A) 0. I mg/ litre permeability
(B) o.5 mg/litre (D) does not affect permeability
and porosit5r
(C) 0.05 mg/litre
(D) None of the above
7. Scour velocity means
4. lryith increase in temperature, the (A) it allows to interact
solubilit5r of gas
(B) it does not allow resuspension
(A) decreases of settled particles
(B) increases
(c) it attains maximum velocit5r at
(C) remains same a particular point
(D) does not change (D) None of the above
AE/PHE/CH/tr/241s7-A
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8. Disposal limit of COD, according to 12. The principal objective of sludge
pollution norms (the Environment management is to
Rules, 1986), is
(A) stabilize the organic matter
(A) 20O mg/litre (B) reduce the sludge volume
(B) 350 mgllitre (C) destroy the pathoBens
(C) 250 mg/litre (D) A1l of the above
(D) 150 mg/litre
13. The secondary treatment of
wastewater is
9. For storing volatile materials, the
roof of the storage tank should be {A} triclding filter
(A) fixed (B) screening
(C) aeration
(B) conical
(D) sedimentation
(C) floating head
(D) Both (A) and (B) 14. In relation to BOD, which of the
following statements is/are coffect?
1O. The most widely used coagulant for (4 Full form of BOD is
treatment of turbid water is biochemical o:rygen demand.
(A) alum (B) In BOD experiment, light (Sun)
is not allowed to Pass inside.
(B) lime
(C) BOD concentration level tells
(C) ferric chloride about the quality of water.
(D) sodium aluminate (D) A11 of the above
15. Which of the following cements is
11. The estimated caPacity of Subanslri useful when concrete is to be laid
Hydroelectric Project is under running water?
(4 1000 Mw (A) Ordinar;r cement
(B) 2000 Mw (B) High alumina cement
(c) 74o Mw (C) Quick setting cement
(D) 2so Mw (D) Rapid hardening cement
I P.T.o.
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16. For oil and gas reservoir, trap 2O, The gamma ray log is used. for
(A) is a reservoir rock (A) identiging litholory
(B) is a cap rock (B) defining bed thickness
(C) may be a structural, (C) detecting and evaluating
stratigraphic or a combination radioactive minerals
of the two
(D) All of the above
{D} None of the above
21. The driil bit is made up of
17. The addition of grysum in cement
(A) stainless steel
(A) increases the setting time
(B) carbon rod
(B) reduces the setting time
(c) does not affect the setting time (c) tungsten carbide steel and
diamond
(D) can increase or decrease
(D) iron
depending on the quantity
1g. well logging means 22. Wastewater containing nitrogen and
phosphorus, if discharges into
(A) lowering electrical and gas lakes, causes
sensors into the hole to take
measurements of the rock (A) foaming
formation there (B) turbidity
(B) lowering a device into the hole
(c) undesirable plant growth
to measure or."";;;;
(c) Both (A) and (B) @) odor nuisance
(D) None of the above
28. water coning in oil or gas well is
19. Priming is needed. in a (A) verticai movement of water
across bedding planes in
(A) reciprocating pump producing formation
(B) centrifugal pump (B) horizontal movement of water
(C) gear pump (C) Both (A) and (B)
(D) diaphragm pump (D) Neither (A) nor (B)
AE/PHE/CH/1U24137-a 4
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24. To increase the weight on the bit 27. Corrosion resistance of steel can be
increased with
(A) a kelly is used
(A) phosphorous and tungsten
(B) a packer is used
(B) lead and vanadium
(C) a drill collar is used
(C) molybdenum and tungsten
(D) a stabilizer is used (D) nickel and chromium
36. Choose the correct statement. 28. An ideal fluid is one which
(A) The natural gas consists of (A) is incompressible
saturated hydrocarbons.
(B) has zero viscosity
(B) The natural gas is partially
or completely saturated with (C) has potential flow
water vapour and may contain
(D) A11 of the above
nitrogen.
(C) The natural gas that occurs 29. Which of the following is a
along with crude oil maY be in Nertonian fluid?
either free or dissolved state.
(A) Rubber latex
(D) All of the above
(B) Sewage sludge
26. Coagulation process removes solid (C) Quicksand
from wastewater by
(D) Non-colloidal solution
(A) adding positively charged
ions for destabilization and
3O. The teffis dam, generator, control
neutralization
gate, penstock, turbine and
sptllway are related to
(B) adding negatively charged
ions for destabilization and (A) hydel power plant
neutralization
(B) nuclear power plant
(C) adding both positively and
negatively charged ions (C) vrind enets/
(D) None of the above {D} solar panel
A€1PHElcHllt/24137-A 5 I P.T.O.
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31. Standard equation for energ/ 35. The smallest unit that can generate
production, where P = power, the crystal is
Il = head, F=flow, E = eificiency is
(A) atom
(A) P=(H+F+E)/11.8
(B) P=(tIxFxE)/11.8
lB| unit cell
(C) molecule
(c) H=(PxFxE)/11.s
(D) E=(PxFxr4/11.s (D) space lattice
32. In hydroelectrieity, the medium 96. Gunmetal is an alloy consisting of
head is
(A) copper
(A) less than 30 metres
(B) nickel
(B) below 3 metres
(C) silver
(C) between 30 metres to 75 metres
(D) magaesium
(D) above 75 metres
03. In dri11ing, the rotary motion is 37' Persons working in cement plants
supplied by and limestone quarries are more
prone to disease like
(A) the draw works
(A) asthma
(B) crown and travelling block
(B) silicosis
(C) kellY
(c) cancer
(D) series of gearing under the
rotary table (D) fluorosis (bone disease)
34. Flow of fluid (laminar flowl
through beds of 38' Activated sludge process is
,*,r"i"l
is represented by _ ""iiiequation. (d attached gro\pth
(A) Kozeny-carman
(B) suspended growth
{B) Blal<e Plummer (c} hybrid (suspended + attached)
(C) Hagen-Poiseuille growth
(D) Bernoulli's (D) All of the above
AE/PHE/CH/1[12413?-A 6
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39. The most suitable technique for 43. Aluminum has
disposal of major hospital's clinical
wastes is E) FCC crysta-l structure
(A) incineration (B) BCC crysta1 structure
(B) landfilling (C) Both (A) and (B)
(C) composting
(D) Neither (A) nor (B)
(D) recycling
The maximum uses of copper are in
The bronzes are alloys of
(A) small-scale industries
(A) eopper and zinc
(B) copper, tin, aluminum, silicon (B) utensil manufacture
and nickel
(C) electrical industry
(c) copper, tin and iron
(D) industrial equipment
(D) silicon, tin and iron manufactufe
41. In constant-pressure liltration
Hardened steel is softened by
(A) resistance decreases with time
(A) annealing
(B) rate of filtration is constant
(B) normalizing
(C) rate of filtration increases with
time (C) carburizing
(D) rate of filtration decreases with
(D) tempering
time
42. Leg support is preferable for Cathodic protecton can be made by
(A) large horizontai cylindrical (A) external power supply
vessels
(B) appropriate galvanic coupling
(B) taII but emptlr vessels
{C} small vessels (C) addition of iron compound
(D) thicked-wall tall vessels (D) Both (A) and (B)
AE/PHElc}I/trl24l37-A I P.r.o.
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47. For a particle settling in water at 51. The minimum thickness of carry
its terminal velocigr, which of the bags made of recycied plastics
following is true? shall be
(A) Buoyancy = Weight + Drag (A) 20 micron
(B) Weight = Buoyancy + Drag (B) 3O micron
(C) Drag = Buoyancy + Weight (C) 25 micron
(D) Drag = weight (D) 15 micron
48, The method for sand control in 52, Horizontal eylindrical vessels are
drilling is supported by
(A) matrix acidization (A) brackets
(B) hydraulic fracturing (B) saddles
(C) acid spotting (C) skirts
(D) gravel packing (D) columns
49. A storage tank is considered to be SI unit of Gc, the Newton's law of
a small tank if conversion factor, is
(A) D(n- \> t72O (4 ke-m/kgf
lBl D{H - Ll < L72o (B) ks-m/kcf-sec2
(c) ,r{(D - 7l < 1720 (c) kglkgf-sec2
(D) Ir(D - Ll > t72O (D) kg-m/sec2
5O. Buming of plastic like PVC releases The optimum condition for
_ into atmosphere. composting like pH be
(A) dioxin (A) 6-9
(B) turan lBl 4-7
(C) hydrogen (c) 8-1o
(D) Both (A) and (B) (D) H
AE,/PHElCIllill24l37-A
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55. To achieve deeper penetration in 59. The thickness of the bottom section
fracture acidizing, it is often of a storage tank is
desirable to retard acid reaction
rate. This is done by adding
(A) smaller than t]:e thickness of
- the top section
(A) CaCl,
(B) larger ttlan the thickness of
(B) acetic acid the toP section
(C) formic acid (C) equal to the thickness of the
top section
(D) All of the above
(D) None of the above
56. Workover rigs are specially used
6O. Disadvantage of gravitational settling
(A) when well stimulation i" is
involved "hambers
(A) it requires large space
(B) for remedial action on problem
wells (B) its erfrciency is low
(C) Both (A) and (B) (C) larger sized pardcles are
separated out
(D) Neither (A) nor (B)
(D) Ali of the above
57. Gravitational settling chambers are
used to remove size range of 61' The viscosity of a gas increases with
(4 20 pm (A) pressure
(B) . 30 pm (B) temPerature
(C) > 5O pm (C) volume
(D) 25 pm (D) mole fraction
f8. Bingham plastic is example for 62. For transition region, the value of
flow of Re5molds number is
(A) Nevrtonian fluid (A) < 2lOO
(B) Reynolds analory (B) ' +ooo
(C) non-Newtonian fluid (c) > 3000
(D) Both (A) and (B) (D) between 2100 to 4OOO
AE /P,JE.lCIllfi/24137-A 9 I P.T.O.
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63. The evolution of hydrogen-type 56. Bernoulli's cquation describes
corosion occurs in
(A) kinetic energr balance in
(A) basic environment laminar flow
(B)neutra.leavironment(B}mechaniealenerSlbalancein
potential flow
(c) acidic environment (c) mechanical energr ba-rance in
boundar5r layer
(D) Both (A) and (C)
(D) kinetic enersr balance in
turbulent flo\r,
64. Potential flow is characterized by
(A) irrotational and frictionless 67' on cooling' a solid phase is
converted to two different solid
flow phases. The reaction is termed as
(B) irrotational and frictional flow (A) eutectic
(C) formation of eddies within t]:e (B) peritectic
flow
(C) eutectoid
(D) None of the above
(D) peritectoid
65, Which of the following pumps is
suitable for pumping smaller fluid 68, Hydraulic radius is the ratio of
at higher discharge pressure?
(A} flow area to wetted perimeter
(A) Volute pump
(B) wetted pefimetef to flow area
(B) Reciprocating pump
(c) flow area to square of cross-
section
{C} Centritugal pump
(D) square root of flow area to
(D) Rotary vacuum pump wetted perimeter
AE /PHE. /CH llr 124137-A
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69. The crystal defect, produced due to 73. The rate of corrosion of metal is
a vacancy in positive ion site, is influenced by
called
(A} electrode potential of metal
(A) Frenkel defect
(B) temperature
(B) compositional defect
(C) stress
(C) Schottlry defect
(D) All of the above
(D) edge defect
74. Which of the following dimensionless
?O. Because of cavitation occurred in numbers is related to mixing
pump, it process?
(A) reduces the pump capacity (A) Prandu number
(B) causes severe erosion (B) Mach number
(C) No liquid can be drawn into (C) Reynolds number
the pump
(D) Power number
(D) All of the above
75. During the washing of fi1ter cake
71. The required value of NPSH for small
centrifugal pumps is
(A) all resistances are constant
(A) 5 metres to 10 metres (B) the filter medium resistance
increases
(B) 4 metres to 6 metres
(C) the fdter medium resistance
(C) 1 metre to 3 metres decreases
(D) 2 metres to 3 metres (D) the cake resistance increases
72. The wall thickness of a pipe is 76, While beginning a centrifugal pump,
indicated by its outlet valve is needed to be
(A) outlet of pipe (A) close
(B) diameter of pipe (B) open
(C) schedule number (C) either open or close
(D) Both (A) and (B) (D) neither open nor close
AEIP}JE /c}I/il/24137-A 11 I P.T.O.
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77. For centrifugal blower, the gas 81. 1 g mole of NaCl is equivalent to
capaclty varies as
(A) 0.13 lb NaCl
(A) velocit5r
(B) 1'0s 1b NaCl
(B) speed
{C} 0'3r lb NaCl
(C) volume
(D) 0.21 lb Nacl
(D) densiw
82. Filter aid is used to
78. The pump used for handling- toxic
of corosive liquid is (A) incfease the rate of filtration
(A) piston pump (B) decrease the pressure drop
(C) increase the porosit5r of the
(B) plunger pump
cake
(C) diaphragm pump
(D) support the septum
(D) centrifugal pump
89. The purposes of agitation of liquid
are
79. The size of tubing is specified by
(A) suspendin8 solid particles
(A) inside diameter
(B) length of tube @) blending miscible liquids
(c) dispersing a gas through the
(c) outside diameter liquid in the form of small
bubbles
(D) size
(D) A1l of the above
8O. The most suitable process for
separatlng two immiscible liquids is 84. Impellers are tJ&e of
(4 centrituging (A) propellers
(B) decantation @) paddles
(C) cyclone separator (C) turbines
(D) gravity settling (D) AIl of the above
AE/PHE/CH/t[/2413?-A L2
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85. The density of a liquid is 89. Diatomaceous silica, perlite and
1500 kg/m3. Its value in g/litre purifi.ed wood cellulose are
ra,ill be
(A) filter aid
(A) 15 (B) explosive
(B) 1'8 (C) filter medium
(c) 1so0 (D) A11 of ttte above
(D) l.ss
9(}. The molar composition of a gas
mixture is 100/6 H2, 10% 02,
86. The method of reducing swirling in 30% CO2 and 50% H2O. lf water
large tank with vertical agitator is completely condenscs, the Iinal
to instdl mole percent of H2 in the gas
mixture will be
(A) baflle
(4 s%
(B) valve (B) 10%
(C) pump (Cl 2Oo/o
(D) turbine (D) 18%
a7. The unit of lilter medium resistance 91. The largest hydroelectricity pov/er
is station of India is located in
(4 cm (A) Assam
(B) Maharashtra
(B) m/s
(C) West Bengal
(C) cm-1
(D) Uttar Pradesh
(D) g/cm
92. The most suitable material for
88. The dimensionless number(s) is/are thermal shield used in nuclear
reactor is
(A) power number, Np (A} concrete
(B) Froude number, /V* (B) steel
(C) Reynolds number, IVs" (C) graphite
(D) A11 of the above (D) zircaloy
AEIPHEICH/I1124137-A 13 I P.T.O.
Text of page 14
v
93. On commercial scale, sedimentation 97. The most commonly used joint in
occurs in underground pipeline is
(A) rotary drum filters (A) coupling
{B) cyclones (B) tlange
(C) thickeners (C) sleeve joint
(D) classi{iersi (D} expansion joint
94. Rivet parts are 98. The cake removed by scraping
off with a horizontal knife in
(A) short cylindrical bar witl continuous rotary vacuum filter is
a head integral to it known as
{B} cylindrical portion of rivet as (A) cutter
shank
(B) doctor blade
(C) lower portion of shank as tail
(C) blade
(D) Al1 of the above
(D) AII of the above
95. Commercial sulphuric acid is 98olo
sulphuric acid and 2yo water, 99. Production casing is also known as
The mole ratio of sulphuric acid
to water will be (A) oil sking or long string
(B) drill bit
{A) 9:1
(B) 8:2 (C) hoisting
(C) g:2 (D) None of the above
(D) 8:1
loo. The design ofstorage vessel for tanks
having shell thicl$ess dependent
96. Hardness of material is measured by upon D and If is
(A) Brinell hardness test (A) D = 2H{q /lC2 +Ca + C4 + CE}}
(B) Rockwell test (B) D = 4}r{q /lc2 + ca + Ca + C5)}
(c) vickers' test Gl H = 2D lq l(C2 + C3 + C4 + cs))
(D) All of the above lD) o = 211 1q llc2 + Csll
AE/PHE/cH/il/24137-A t4
Text of page 15
SPACE FOR ROUGH WORK AEIPIJE/C}tllll24l37-A 15 I P.T.O.
Text of page 16
tt
SPACE T'OR ROUGH WORK
***
AE,IPHE/CrI/tr/24137-A 16 24T-6ox4
Text of page 1
^e& q-a-E- cqf:€c:Fr<f q:fc:=I-f5f
Provisional Answer Key of OMR based Screening Test for
recruitment to the post of Assistant Engineer (Civil, Mechanical, Electrical, Chernical) Public
Health Engineering Department
held on 09.06.2024
(A&{. No.28/2023 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
1 B 26 A 51 C 76 A
2 C 27 D 52 B 77 B
3 C 28 D 53 B 78 C
4 A 29 D 54 A 79 C
5 D 30 A 55 D 80 B
6 A 31 B 56 C 81 A
7 B 32 C 57 C 82 C
8 C 33 D 58 C 83 D
9 C 34 A 59 B 84 D
10 A 35 B 60 D 85 C
1l ts 36 A 61 B 86 A
12 D 37 B 62 D 8'7 C
13 A 38 B 63 C 88 D
14 D 39 A 64 A 89 A
15 C 40 B 65 B 90 C
16 C 41 D 66 B 91 B
17 B 42 C 67 C 92 B
18 A 43 A 68 A 93 C
19 B 44 C 69 C 94 l)
20 D 45 D 70 D 9s A
2l C 46 D 71 D 96 D
22 C 47 B 72 C 97 C
23 A 48 D 73 D 98 ll
24 C 49 B 74 D 99 A
25 D 50 D 75 A 100 B
Td-"-u
Text of page 2
^& q-:rEr <a.f<5-cq.=TT q-!-<-:=rT€|.
Provisional Answer Key of OMR based Screening Test for
recruitment to the post of Assistant Engineer (Civiln Mechanical, Electrical, Chemical) Public
Health Engineering Department
held on 09.06.2024
(Advt. No.28l2023 dated 3 1.10.2023)
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
1 A ZO A 51 B 76 C
2 C 27 u 52 C 7'.l C
3 D 28 C 53 D 78 C
4 I) 29 C 54 A 79 B
5 C 30 A 55 B 80 D
6 A 31 B 56 A 81 B
7 C 32 D 57 B 82 D
8 D 33 A 58 B 83 C
9 A 34 D 59 A tt4 A
10 C 35 C 60 B 85 R
1l B J6 C 6t D 86 B
1.2 B 37 B 62 C 87 C
13 C 38 A 63 A 88 A
t4 D 39 B 64 C It9 C
15 A 40 D 65 D 90 D
16 D 4l C 66 D 9t D
17 C 42 C 67 B 92 C
18 B 43 A 68 D 93 D
19 A 44 C 69 B 94 D
20 B 45 D 70 D 95 A
21 B 46 A 7l C 96 A
22 C 47 D 12 B 97 B
23 C 48 D 73 B 98 C
24 A 49 D 74 A 99 C
25 D 50 A 75 D 100 B
ra--'
Text of page 3
^& q:-[-r cG-r.|-:<5<q.=fT qtc=]rf€t
Provisional Answer Key of OMR based Screening Test for
recruitment to the post of Assistant Engineer (Civil, Mechanical, Electrical, Chemical) Public
Health Engineering Department
held, on 09 .06.2024
(Advt. No.28/2023 dated 3 1.10.2023)
Subiect: Paper - II (CHEMICAL ENGINEERING)
Series: C
Marks: 100 Time: 2:00 hours
Q.NO. ANS_KEY Q.NO. ANS-KEY Q. NO. ANS KEY Q. NO. ANS KEY
I C 26 A 51 B 76 A
2 B 27 B 52 C 77 D
3 B C 53 C 78 D
4 A 29 C 54 A 79 D
5 D 30 B 55 D 80 A
6 C 31 A 56 A 81 B
7 C 32 C 57 B 82 C
8 C JJ D 58 C 83 D
9 B 34 D 59 C 84 A
10 D 35 C 60 A 85 B
11 B 36 A 61 B 86 A
12 D 37 C 62 D 87 B
13 C 38 D 63 A 88 B
14 A 39 A 64 D 89 A
15 B 40 C 65 C 90 B
t6 B 41 B 66 C 91 D
17 C 42 B 67 B 92 C
l8 A 43 C 68 A 93 A
l9 C 44 D 69 B 94 C
20 D 45 A 70 D 95 D
21 D 46 D 7l C 96 D
22 C 47 C 12 C 97 B
23 D 48 B 73 A 98 D
24 D 49 A 74 C 99 B
25 A 50 B 75 D 100 D
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Text of page 4
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\ffiz
Provisional Answer Key of OMR based Screening Test for
recruitment to the post of Assistant Engineer (Civil, Mechanical, Electrical, Chemical) Public
Health Engineering Department
held on 09.06.2024
(Advt. No.2812023 dated 31.10,2023)
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 B 26 C 5l A 76 A
2 C 27 C 52 C 77 B
3 D 28 C 53 D 78 C
4 A 29 B 54 D 79 C
5 B 30 D 55 C 80 A
6 A 31 B 56 A 8l B
7 B 32 D 57 C 82 D
8 B 33 C 58 D 83 A
9 A 34 A 59 A 84 D
10 B 35 B 60 C 85 C
11 D 36 B 6l B 86 C
12 C 31 C 62 B 87 B
l3 A 38 A 63 C 88 A
14 C 39 C 64 D 89 B
15 D 40 D 65 A 90 D
16 D 41 D 66 D 91 C
17 B 42 C 67 C 92 C
18 D 43 D 6u R 93 A
19 B 44 D 69 A 94 C
20 D 45 A 70 B 95 D
2\ C 46 A 71 B 96 A
22 B 41 B 72 C 97 D
IJ B 48 C 73 C 98 D
24 A 49 C 74 A 99 D
IJ D 50 B 15 D 100 A
a";Page 1 of 16
Source: Assam Public Service Commission. Question paper published by Assam Public Service Commission.