JPSC Assistant Engineer 2021: Assistant Engineer Written Exam, Advt. No. 08/2018 and 08/2019, MECHANICAL ENGINEERING PAPER-1 SUBJECT-CODE-04
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Booklet No.
BOOHes AEUD
QUESTION B00KLHT 782257.
RECHANICAL ENGINEERING
PAPHR - I (04)
± TiineAIlowed : 2 Hours Maximum Marks : 200
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1. In reciprocating air compressor the 6. Heatconduction in gases is due to
method .of controlling the quantity of
(A) motion ofelectrons
air delivered is done by
a) elastic impact of molecules
(A) Throttle control
a) Blow-off control (C) mixing motion of the different
layers of the gas
(C)\ Clearance control
a) All of`the above a) electromagnetic waves
2. Heat transfer takes place according to 7. Indicate the metal with highest thermal
the following law of thermo'dynanics conductivity
(A) Zeroth Steel
a3) First Silver
(C) Second
copper
a)) Third
A1 uniniun
3. Heat transfer in liquid and gases is
essentially due to 8. Identifytheverygood insulator
(A) Conduction (A) Sawdust
a3) Convection a) Glasswool
(C) RadiatioL (C) Cork
a)) Conduction and Radiation a) Asbestos sheet
4. Which mode(s) of heat transfer does
9. Theunitofthemal diffusivityis
(do) not need a mat6rial medium ?
(A) Conduction (A) m2th|.oc
a) Convection @) kcal/m2-hr
(C) Radiation (C) mthr°C
(D) Convection and Radiation @) in?dr
5. As the temperature increases, the
10. Critical thickness of inenlation for
thermal conductivity of a gas
spheres is given by
(A) increases
(A)in
a) decreases
a3) Kr47,h
(C) remains constant
(C) hex
a) increase upto a certain
temperature and then decrease @)2m
04 Series-A
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11. Fins are provided on heat transforming 16. Heat transfer by Radiation is
surface in order to increase encountered least in
(A) heat transfer area (A) Boiler furnace
(8) heat transfer coefficient a) Insulated steam pipe
(C) temperature gradient (C) Electric bulb
a) mechanical strength of a) Nuclear reactor
equipment
17. Absorptivity of a body is equal to its
12. Firmed surfaces have improved rate of
emissivity
heat dissipation due to
(A) forapolishedbody
(A) decrease in ambient temperature.
a3) under thermal equilibrium
a) increase in the surface area condition
exposed to the surrounding.
(C) at one particular temperature
(C) increase in the corrective film
coefficient. a) at shorter wavelengths
a) Alloftheabove
18. The emissivity is likely t,o be higher in
13. An increase in fin effectiveness is case of _
c'ausedby highvalue of , (A)` Rubber
(A) convective coefficient a) Paper
(8) themal conductivity (C) Carbon
(C) Oil.cumference a) Ironoxide
a) a3)and(c)
19. The emissivity and the absorptivity ofa
14. Transient conduction means real surface are equal for radiation with
identical temperature and wavelength.
(A) very little heat transfer.
This law is referred as
a) heat transfer for a short time.
(C) heat transfer with a very small (A) Lambert's lil
temperature difference. (8) ELchoffs law
(D) conduction when the temperature (C) Planck's law
at a point varies with time.
a) Wien's displacement law
15. In the lumped parameter model, the 20. Which parameter should be highest for
temperature variation with time is a radiation shield ?
` (A) Linear (A) Absorptivity
a) cubic a) Reflectivity
(C) Exponential (C) Transmissivity '
a) Sinusoidal a) Emissivity
Series-J@ 04
I
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21. The gray body shape factor for radiant 26. In Bell-Colemann refrigerator for the
heat exchange between a small body same temperature range
(emissivity 0.4) in a large enclosure (A) cop of dense air system is higher
(emissivity 0.5) is than COP of open air system.
(A) o.1
@) 0.2 .
i (B) tch°anp63Se:;eo;=nsr:t:;st]:::Wer
(C) cop of dense air system is equal
(C) 0.4 to COP of open alr system.
@) 0.5 a) cop of dense air system may be
higher or lower than COP of open
22. Free convection heat flow depends on air system depending upon
all of the following, except : pressure ratio.
(A) 1 ,Density 27. Heat is rejected by the refrigerant,
a) Coefficient ofviscosity during vapour compression
refrigeration cycle in
(C) Gravitational force
I (A) Condenser
a) velocity
23. The ratio of kinematic viscosity to i ,£) ia:p;:r:;?rve
thermal diffusivity is known as
28. A domestic refrigerator capacity may
(A) Prandtl number be approximately
(8) Nu§selt number (A) lton
(C) Pedetnumber
i S)::;:::
(D) Schmidtnumber
(D) 10ton
24. The prandtl number will be lowest for 29. In a domestic vapour compression
reffigerator the refrigerant used is
(A) Water
(A) C02
(8) Liquidmetal
I ` @) Freon-12
(C) .Aqueous solution
I (C) Ammonia
a) Lubeoil
I a) All of the above
25. ` Dropwise condensation usually occurs 30. In vapour compression refrigeration
system, if expansion cylinder is used in
On
place of throttle valve, the COP will
(A) Glazed surface
a) Smooth surface i a)
(A) decrease
increase
(C) Oily surface
a) Coated surface i S} ¥i::i:::Pa:¥iiscfabol: unless
04 S`eries-A
I- E.
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31. Ifa hydraulic press has a ram of 12.5 36. Flow separation is caused by
cm diameter and plunger of 1.25 cm
I (A) thinning of boundary layer
diameter, what force would be required thickness to zero.
on the plunger to raise a mass of 1 tonne
a) a negative pressure gradient.
on the ram ?
(A) 981N I (C) apositivepressuregradient.
I a) reduction of pressure to local
@) 98.1N vapour pressure.
(c)I 9.81N
a) 0.98N 37. The magnus effectis defined as
32. A liquid mass readjusts itself and I (A) The generation of lift per unit
drag force.
undergoes a rigid body type of motion
when it is subjected to a (8) The circulation induced in an
aircraft Wing.
(A) constant angular velocity
(C) The separation of boundary layer
a) constant angular acceleration near the trailing edge of a slender
(C) 1inearly varying velocity body.
(D) linearly varying acceleration a) The generation of lift on a
rotating cylinder ih a uniform
33. The thickness of laminar boundary flow.
layer at a distance `X' from the leading
edge over a flat plate varies as 38. The drag coefficient for laminar flow
(A)
a3)
(C) i :3Tes:w:llt,:ReysoldsNumber Qe, as
a) (c) Re-I
a)) Re-1"
34. If the diameter of a capillary tube is
doubled, the capillary rise will become
39. The square root of the ratio of inertia
(AL) rfe2 times Less force to gravity force is called
a) double (A) Reynold'; number
(c) half @) Froudenumber
®) Ji2 times rrLone (C) Machnunber
a) Eulernunber
35. Ametallicpieceweighs 80Nin air and
60 N in water. The relative density of 40. The Bemoulli's equation refers to
the metallic piece is about conservation of
(A)8
I (A) Mass
a)6
I a) Linear momentum
(C)4
•.@) 2
i S}'£egru;armomerfum
Series-A 5 04
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41. Velocity. distribution in a turbulent 46. In rough turbulent-flow in a pipe, the
boundary layer follows : friction factor would depend upon
(A) Logarithmic law (A) Velocity offlow
a3) Parabolic law a) Pipe`diameter
(C) Linearlaw (C) Type offluid flowing
(D) Cubiclaw (D) Pipe condition and pipe diameter
42. Flow separation is likely to take place 47. The differential manometer connected
when the pressure gradient in the to pitot static tube used for measuring
direction of flow is fluid velocity gives
(A) Zero (A) static pressure
(8) Adverse a) totalpressure
(C) Slightly favourable (C) dynamic pressure
a) Strongly favourable a)) difference between total pressure
& dynamic pressure
43. In a rotaneter as the flow rate
increases, the float 48. Shear stress in aturbulent flow is dueto
(A) rotates at higher speed (A) the viscous property of the fluid
a) rotates at lower speed a) the fluid density.
(C) rises inthe tube (C) fluctuation of velocity in the
direction of flow.
a) drops inthetube
a) fluctuation of velocity in.the
direction of flow as well as
44. A nozzle has velocity head at outlet of transverse to it.
10 in. If it is kept vertical the heicht
reached by the stream is
49. Surface tensionis dueto
(A) loom
(A) Viscous forces
@) 10m
a) Cohesion
tc] rfeoTrL (C) Adhesion
(D, ±m ' (D) The difference between adhesive
and cohesive forces
45. Laminar sub-layer may develop during 50. Newton's law of viscosity depends
flow over a flat plate. It exists in upon the
L aminar zone (A) stress and strainin a fluid
Transition zone a) shear stress, pressure andvelocity
Turbulent zone (C) shear stress and rate ofstrain'
Laminar & Transition zone a)) viscosityand shear stress (a i
04 Sdies-A
Text of page 7
51. Which phenomenon will occur when 56. Apeltonwheelisan
the valve at the discharge end of a pipe
(A) axial flow impulse turbine
connected to a reservoir is suddenly
closed ? a)I inward flow impulse turbine
(A) Cavitation (C) outward flovi impulse turbine
(8) Erosion (D) All of these
(C) Hammering
(D) Surging 57. An impulseturbine is used for
•(A) 1owhead of water
52. Which one of the dimensionless
a) mediumhead of water
number identifies the compressibility
effect of a fluid ? (C) hichhead of water
(A) Euler number (D) Any one of these
a) Froudenumber
(C) Machnunber 58. A double overhung pelton wheel has
a) . Weber number (A) twojets
@) tworuners
53. In the boundary layer, the flow is (C) Fourjets
(A) viscous and rotational a) Fourruners
a) inviscid and irrotational
(C) inviscid and rotational 59. In an inward flow reaction turbine, the
(D) viscous and irrotational wat6r
(A) Flows parallel to the axis of the
54. The head loss in turbulent flow inpipes
wheel.
varies
@) Flows at right angles to the wheel.
(A) Directly as the velocity.
(8) Inversely as the square of the (C) Enters at the centre of the.wheel
velocity. and then flows towards the outer
periphery of the wheel.
(C) Inversely as the square of the
diameter. (D) Enters the wheel at the outer
a) Approximately as the square of periphery of the wheel and then
the velocity. flows towards the. centre of the
wheel.
55. Resultant pressure of the liquid in case
of an immersed body acts through 60. In aFrancis turbine, runner, the number
which one of the following ? of blades are generally
• (A) Centreofgravity (A) 2to4
(8) Centre of pressure a) 4to8
(a), Metacentre (C) 8to16
a)) Centre of buoyancy a) 16to24
seriesT-AI' 04.
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61. The p.ower produced by a reaction 66. De`Laval turbine is
turbine is (A) simple single wheel impulse
turbine
(A) directly proportional to ri
@) simple single wheel reaction
03) inversely proportiorial to H turt)ine
(C) directly proportional to vE (C) velocity compounded impulse
turbine.
a)) inversely proportional to +H a) pressure compounded impulse
turbine.
62. Comishboiler is
67. The pressure on the two .sides of the
(A) Fire tubeboiler moving blades of a reaction steam
03) High pressure boiler turbine is
(C) Watertube boiler (A) same
a) higher atinlet
a) Locomotive boiler
(C) lower atinlet
a) may be higher or lower
63: Lancashire boiler is depending on quality of entry
steam
(A) Water tube boiler
a) Firetubeboiler 68. For Parson's reaction steam turbine,
(C) High pressure boiler degree of reaction is
a)) Locomotive boiler (A) 60%
@) 50%
(C) 100%
64. In locomotive boiler, the maximum
@) 75%
pressure is of the order of
(A) 5 kgfi/cm2 69. Rcheat factor in steam turbines depends
On
a3) 10kgflrcm2
(A) Stage efficiency only
(C) 20kgivcm2 (8) Initial pressure and temperature
(D) 100 kgfi'cm2 only
(C) Exitpressure only
a) Alloftheabove
65. Which of the following as referred to
steam boiler are defined as mountings ?
70. The value of reheat factor normally'
(A) Superheater varies fom
a) Economiser (A) 1.2tol.6
a) 1.02to1.06
(C) Preheater
(C) 0.9too.95
a) Fusibleplug a) 0.5too.6
04 Series-A
Text of page 9
71. .The. clearance volume of a 76. A gas turbine works on which one of
reciprocating compressor directly the following cycles :
affects
(A) Brayton
(A) Piston speed
a3) Rankine `
a) Noiselevel
(C) Stirling
(C) Volumetric efficiency
a) Temperature of air after a) Otto
compression
Reheating in a gas turbine
72. In a paralle-1 flow gas. turbine
(A) increases the compressor work.
recuperator, the maximum
effectiveness is a3) decreases the compressor work.
(A) 100% (C) increases the turbine work.
a) 75% a) decreases the turbine work.
(c) 5o%
a) between25% &45% 78. Blade erosion in-steam turbines take
place
73. In aircraft gas turbines, the axial flow
(A) Due to high temperature steam.
compressor is preferred because
a3) Dueto droplets in steam.
(A) of high pressure rise
(C) Due to high rotational speed.
(8) itis stallfree
a) Due to highflowrate.
' (C) of low frontal area
a) ofhigherthrust
79. Reciprocating compressors
74. For a multistage compressor, the provided with
polytropic efficiency is (A) Simple disc plate valve
(A) the efficiency of all stages a) Poppetvalve
combined together.
(C) Spring-loaded disc valve
a3) the efficieney of one stage.
a) Solenoidvalve
(C) constant throughout for all the
stages.
(D) a direct consequence of the 80. A centrifugal compressor is suitable
pressure ratio. for, which of the following :
(A) . high pressure ratio,` law mass
75. In turbo machine used to circulate fl OW
refrigerant in large refrigeration plant is
a) low pressureratio, low mass flow
(A) a centrifugal compressor
(C) high pressure ratio, high mass
a) aradial turbine fl OW
(C) an axial compressor
a) low pressure ratio, high mass
a) an axial turbine
Series-A :. 04
Text of page 10
81. A thermodynamic system refers to 86. Work done in a free expansion process
1S
(A) any defined region in space
a3) a specific mass in fluid flow (A) zero
(C) a specified region of constant @) .minimum
volume
(C) maximum
a) a prescribed and identifiable
quantity of lnatter a) positive
82. Which of the following represents a
87. During throttling process
closed system ?
(A) Bomb calorimeter (A) internal energy does not change
(a) Boiler (8) pressure does not change
(C) ` Universe (C) entropy does not change
a) Centrifugal pump a) enthalpy does not change
83. Which amongst the following is not a
property of the system ? 88. When a gas istobe stored,thetype of
compression that would be ideal is
(A) Heat
@) Composition (A) ` Isothemal
(C) Specific volume (8) Adiabatic
a) Thermal conductivity (C) Polytropic
84. For a heat engine operating in Camot
a) Constant volume
cycle, the work output is 1/4th of heat
rejected to the sink. The thermal 89. The powerproduced inside the cylinder
efficieney of the engine would be • of an I-C engine is known as
(A) .10%
(A) Indicated power
a3) 200/o
(C) 30% a) Brakepower
a) 50% (C) Pumpingpower
(D) Frictional power
85. A reversible process requires that
(A) there be no heat transfer.
90. Pumpingpoweris equal to
a) Newton's law of viscosity be
satisfied. (A) Total power produced
(C) temperature of system and a) Net power produced
sunounding be equal.
(C) (A)+(B)"
(D) there be no viscous or Coulomb
friction in the system. a) None of the above
04 Series-A
Text of page 11
91.
c¥ceiet:::naeLaes:1:=::redo:oaa24:::::-!96.#tehknockln8mS.Iengmesincreases
cycle engine is
I (A) increase in inlet air temperature
(A) more
(8) less i (€} ::::a::mcmomp::sos,1:%ratL:ater
(C) equal temperature
(D) muchless
i (D) Alloftheabove
97. The ignition quality.of fuel for S.I.
92. The CR for a petrol engine varies from engine is detemined by
(A) 6tolo (A) Cetane number rating
(a) 10tol5 a) Octane number rating
(C) 15to25 jj (C) Calorific value rating
I a)) Volatility of the fue`l
a) 25to40
98 Octane number of the fuel used
93. The stroke volunre is 500 cc. The commercially for diesel engine in hdia
clearance is 50 cc. The compression is in the range of
Ratio is (A) 80to90
ji
(A) 1o I
(a) 60to80
@)11 I (c) L80to85
(c) ,9 a) 40to45
@)15
99 The work input of air compressor is
minimum if the compression law
94. Carburettor is used for followed is
(A) Sl engines 1' (A) Pvl.35-c
(8) Gas engines i a) Isothermalpv=C
i (C) Isentropicpvv= C
(C) C.I. engines
i a) pvl.2-c
(D). `None of the above
i
100. For the same overall pressure ratio, the
95. Normal heptane contentLin fuel for s.I. leakage of air past the piston for
engines multistage compression as compared to
(A) retards auto-ignition single stage compression, is
a) accelerates auto-ignition
(C) does not affect auto-ignition
(D) No-ne of the above i, t§L:os:srsefut
a)) maybe more orless
Series-A
04
Text of page 2
JHARKHAND PUBLIC SHRVICE COMMISSION
Revised Answer Key
Assistant Engineer (Civil, MechanicalAIlectrical) Advt. No.-08/2018 and 08/2019
Subject- (General Ability Test)
Ouesti on Nos.
Revised Correct ®pfron
series - A series - a Series - C Series - D
QUESTION IS INCORRECTTWOMARKSRILLBEGIVENTOALL
57 26 5 93
81 55 34 18 8
84 53 32 16 BOTH C & D ARE CORRECT
97 66 SO 34 A
EEEu]
:rhian
Controlle ination
Jharkhand Public Service Commission,
Ranchi
Text of page 3
JHARKHAND PUBLIC SERVICE COMMISSION
Revised Answer Key
Assistant Engineer Advt. No.-08/2018
Subj ect- (Mechanical Engineering Paper-I)
Ouesti on Nos*
Rchsed Correct Option
Series - A series - 8 series - c Series - D
41 2S 4 83 A
42 21 5 84 8
52 31 15 94 C
53 32 11 95 A
60 39 18 97 C
79 S8 37 16 C
83 62I 41 25 A
9r-(:L- ,A
EE
I HillF
Controller f tlon
Jharkhand Public Service Commission,
Ranchi
Text of page 4
JHARREAND PUBLIC SERVICE COMMISSION
Revised Answer Key
Assistant Engineer Advt. No.-08/2018
Subj ect-(Mechanical Engineering Paper-H)
Ouesti on Nos,
Revised Correct a Pfiun
series - A series - 8 series - c series - D
ALL OPTIONS AREINCORRECTTWOMARKSWELLBEGIVENTOALL
29 11 94 67
34 14 100 71 C
45 25 8 79 BOTH A & 8 ARE CORRECT
ALL OPTIONS ARECORRECT
80 63I 46 17
01
Controller fExaination
Jharkhand Public Service Commission,
Ranchi
Text of page 5
JIIARKIIAND PUBLIC SHRVICE COMMISSION
Revised Answer Key
Assistant Engineer Advt. No.-08/2018
Subject- (Civil Engineering Paper-I)
Question Nos.
` Series - 8 ' Revised c\®rreefo H.
tion I
series - A series -, c sutes - D
12 90 67 47 C
13 91 68 44 A
16 94 71 51 A
31 9 86 62 C
63 41 18 94 8
8S 63, 40 19 D
th
Jharkhand Public Service Commission,
Ranchi
Text of page 6
JHARKHAND PUBLIC SEIRVICE COMMISSION
Revised Answer Key
Assistant Engineer Advt. No.- 08/2018
Subject- (Civil Engineering Paper-H)
Ouestio n Nos.
' Series - A Revised C®rmeef Oprfum
• series - 8
Series ~ C series - D
2 79 61 40 C
44 24 2 81 A
62 39 20 99 D
84 61 39 18 8
88 651 43 22 8
p-|`` fi
E=
Controller o Examination
Jharkhand Public Service Commission,
RanchiPage 1 of 11
Source: Jharkhand Public Service Commission. Question paper published by Jharkhand Public Service Commission.