JPSC Assistant Engineer 2021: Assistant Engineer Written Exam, Advt. No. 08/2018 and 08/2019, MECHANICAL ENGINEERING PAPER-2 SUBJECT-CODE-05
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BooHes • AHUD BookletNo.
QUESTION BOOKLET 787257
RECIIANICAL ENGINEERING
PAPER -11 (05)
TimeAllowed : 2 Hours Maximum Marks : 200
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1. If two gears A with rnA = 2 mm and I 4 For the condition of principal stresses
tA=50anaBwithmB=4mmandtB= i Oi, 02 Positive and. o3 .= 0, and also
30 teeth are in mesh with each other I Cri > 02 > 03, the equation of boundary
line of failure envelop as per maximum
::;:I::]aotnAo:°gfaet:S gil? :p°p°roxpxr:atthe:; i shear stress theory will be
near to (A) Cri-02=Syt
(A) 60rpm
a) 100xpm
(C) 92Ipm
(D) 83rpm
i :;:i:;;
5. In case ofaboltedjoint if the gasket is
2. The knuckle pin in a two rod knuckle
too soft, the resultant load, Pb on'bolt
joint under axial load will be subjected
will be
to shear stress. The failure are; of the
(A) initial tension, Pf only
pin under shear will be
a3) external load, P, only
(A, :d2
(C) sum ofinitialteusion and external
load, Oi + P)
(8) 7td
(D) difference of external load and
(c, gd2 initial tension, a' - Pi)
a) None of the above
6. A screw thread with M12 x 1.25
designation indicates
3. For a square and flat key, the relation
between induced stresses due to the (A) A coarse thread, with 12 mm
- maj or diameter
transmitted torque will be
(A) Oc-I a) A coarse thread, with 12 mm
minor diameter
a) oc-i/2 (C) A fine thread wid 12 -major
dia and 1.25 -pitch.
(C) oc-3T
a) A fine thread with 12 mm minor
a) Oc-2t dia and 1.25 mm pitch.
05,' Series-A
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7. Transverse shear stress at the root of the 9., For a parallel fillet weld, the ratio
nut tn is expressed by . between throat, t and leg, h is
(A) vi
a) 2vi
I", :.¥
(c,±
•c,#
(D,±
•D,#
VI ere W - load, d - major dia., 10. Ifa material fails below its yield point
dc - core dia. failure would be due to
t - thread thickness at the root (A) Straining
of the nut and
(a) Fatigue
Z - number of threads in
engagement with the nut. (C) Creep
a) Sudden loading
8. Magnitude of primary shear stress in
case of eccentrically loaded welded
connection with throat t of the weld as 11. Maxinum principal stress theory is
shown in figure will be in N/_2. generally applicable for
(A) Ductile material
(8) .Brittle material
(C) Elastic material,
a) None of the above
7.5
(A) 12. Margin in in rivetted joint is usually
t
kept equal to .
75
a) t '`,. (A)d
750 `'-
(C) a) 1.25d
t
(C) 1.5d
Zap ,,,`.`',,
a) a)2d
Series-A 05
Text of page 4
13. If tearing efficiency ofarivettedjoint is 17. Stress concentration factor in an infinite
80%, then. the ratio of diameter d of
plate with a transverse h6le, loaded by
rivet to the pitch p will be
in plane uniaxial tension is
(A)2
EL-,
14. Bearing characteristic number is
identified by
(A) p/ZN
a3) Z/pN
(C) ZpIN
a) ZN/p 18. Surface finish factor for a mirror
polished compor}ent is
15. When a circular shaft is subjected to
torque only, the torsional shear.stress is (A) 0.75
(A) Maximum at the axis of rotation a3) 0.85
and zero at outer surface.
(C) 0.9
(8) Maximum at outer surface and
zero at axis of rotation. @)1
(C) Uniform from axis ofrgtation to
outer surface
In order to detemine the endurance
(D) None of the above
strength, the rotating beam specimen is
16. When the diameter of shaft is doubled, subjectedto
its torque transmission capacity will
increase by (A) Repeated stress
(A) 8times (8) Completely reversed stress
a3) 4times
(C) . Maximum stress
(C) 16times
a) 2times a) None of the {above
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20. Maximum shear stress for the shown 23. One of the following expression is true
stressc;n#o at any cross section of the transversely
loaded beam between points of
application of concentrated loads
(A, ¥-P
@, ¥-w
(A) a/2
a)a (c, ¥-vx
(C) 2o
a)0
a), ¥-o
wiere P - load, W i load intensity,
Vx - shear force, Mx - Bending
21. Ifa cylindrical rod of cross section A is Moment
applied with uniaxial tension P, the
maxiinum shear stress in the rod will be 24. Maximum bending moment for the
shown overhang bealn with loads will be
(A)0
a3) ii
(A) .P(a+Z)
(C)
a) p.i
a)¥ (C) Pa
@) P(2a+0
22. For biaxial state of stress, maximum 25 Reaction RB at support a fpr the shown
shear stress in the principal plane will simply supported beam will be
M2M
be
(A)0
1\.I
a)01
(C) 02
C''
@) (ol-o2)'2
Series-A 05
Text of page 6
26. For a cast iron simply supported beam 29. For a hollow circular shaft under
with low strength in tension and high torsion T only the shear stress, T will be
strength in compression, due to the expressedby -
transversely applied load, with beam
bent concave upwards, following 16T
(A)
section will be better ft¢+i?)
(A) Square
32T
(8)
(8) Rectangular
(C) Circular
1 6T do
a) Trapezoidel a)
27. Two coiled springs each having .Where do, df are outer and inner
stiffness k are placed in parallel. The diameters.
stiffiiess .of the combination will be
(A) 4k
30. Mohr's circle for membrane stresses in
a)2k
a thin walled spherical pressure vessel
with radius r and wall thickness t, under
internal pressure p will be
28. If strain energy at the point of
application of a point load P at the mid
span of a simply supported beam is
U = P2/3/96EI, the deflection at this
point will be
(A)#
@)#
(c)#
a')# •(D)
05 Series-A
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31. The core of a. section in a strut within 33. A FCC crystalline structure unit cell
which the load P will induce
shares
Loeffiff#;beTonfor (A) 8atoms
(8) 9atoms
(C) 13atoms
a) 14atoms
tA)bEHIV4 34. Miller indices of the plane ABC will be
a, bEEL4
(c)bEstus (A) 123
a) 321
(C) 632
@,bEHIV4 (D) 211
35. Slow plastic deformation of metals
32. or-iron has following crystalline
under a constant stress is known as
structure :
(A) Fatigue
(8) Creep
(C) HCP (C) Endurance
a) None ofth5-above @) Ductility
Series-A 05.
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36. Isotropic materials are those which 41. Babbits are used for
have the same Gears
(A) stresses induced in all direction.
03) elastic properties in all direction.
Cluteh liners
(C) magnetic. properties in. all
direction.
42. Cold working is done below a certain
(D) density in all direction.
temperature of material known as
(A) Critical temperature
37. Which of the following steel is softest?
(8) Recrystallization temperature
(A) Ferrite
(C) Transition temperature
a) Cementite a) None of the above
(C) Pearlite
a) Austenite 43. The process of pulling a wire or bar
through a die opening is called
38. Following is a unique property of cast (A) Rolling process
iron : a3) Open die forging process
(C) Drawing process
(A) Malleability
a) None of the above
@) Ductility
(C) Surface finish 44. An annealed copper strip, 9 inch
a) Damping characteristic (228 mm) wide and 1 inch (25 mm) is
rolled to a thickness of 0.80 inch (20
mm) in one pass.
39. Corrosion resistance of steel is
increased by addition of The absolute value of true strain that the
strip undergoes is
(A) Cr&Ni
(A) 0.20
(8) Sulphure, Phosphorous,lead
03) 0.25
(C) Zinc (C) 0.223
a) Tungsten, Vanedium a) 0.225
)1
40. German silveris an alloy of 45. Periodic circumferential cracks on the
surface is known as
(A) Silver andgold
(A) Bamboo defect
@) Silver and some impurities
a3) Pipe defect
(C) NIckel, copper and zinc
(C) Firtree defect
a) None of the above @) Centre crack
05 Series-A
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46. Distorsion allowance is not provided in 51. Thermoplastics are
the following shape of casting :
(A) Non-linear polymers in which
(A) U. rise in temperature increases
03)T plasticity.
(C)C (a) Linear polymers in which rise in
a)0 temperature increases plasticity.
(C) Linear polymers in which
47. Low permeability in sand can cause temperature has no effect on
following defects in casting :
plasticity.
(A) Rough surface
a) None of the above
a) Blowholes
(C) Hottears 52. Thermitwelding is a form of
a) Drop
(A) Resistance welding
48. Powders of two or morepure metals are (8) Gas welding
mixed in a ball mill. The process is (C) Fusion welding
known as
a) Arc welding
(A) Electrolytic deposition
a3) Reduction 53. The most commonly used flame is gas
(C) Communication welding is
a) Mechanical AIloying
(A) Neutral
49. Which of the following structure of 03) Oxidising
;teel is magnetic in nature ? (C) Carburising
(A) (D) None of the above
a)v
(C) or 54. In reverse polarity welding
a) None of the above (A) Electrode holder is comected to
negative and work to positive.
50. Hypoeutectoid steels on cooling during a3) Electrode holder is connect.ed to
amealing process converts to
positive and work to negative.
(A) Pearlite I-'
(C) - Electrode holder is comected to
a) Cementite . positive and work is earthed.
(C) Austenite a) Electrode holder is earthed and
a) None of the above-J` work is cormected to negative.
H
Series-A 05
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55. ,The time period between placing an 59. The Break Even quantity for an
order and its receipt in stock-is known industry selling a product for { 10/unit,
as with fixed cost for assets i 40,000 and
variable cost of { 6 per unit will be
(A) Canyingtime
(A) 8,000
a) Shortagetime
(8) 1o,ooo
(C) Overtime
(C) 12,000
a) Leadtime
(D) 14,ooo
56. Given amual usage, U = 50 units,
60. Short ten regular variations related to
Procurement cost, P = { 15 per order,
the calender or tine of day is known as
cost per piece, C] = { 100 per item and
(A) Seasonality
C2, a percentage including insurance,
a) Trend i
taxes, etc = loo/o, the economic order
(C) Cycles
quantity EOQ will be ` a) Random variations
•(A.) rfes
q3, rfeo 61. A dummy activity
(c) - JTifo (A) is artificially introduced.
(8) is represented by a dotted line.
.@) Vie
(C) does not cousumetime.
57. Inventory carrying cost a) Alloftheabove
(A) Increases with, quantity ordered.
62. PERT analysis is based on
q3) Is a fixed cost with refe;ence to
(A) Optimistic tine
quntity ordered.
03) Pessimistic time
(C) Decreases with quantity ordered.
(C) Mos.t likely time
a) 'First increases than decreases
with quantity ordered.
a) Alloftheabove
63 The perfopriance of a specific task in
58. AtBreakEvenpointthere is CPM is kn6un
(A) Profit (A) Dummy
a) Loss a3) Event
(C) .Noprofitorno loss (C) Activity
a) . None of the above @) Control
05 Series-A
Text of page 11
64. The critical activity has 69. The Robotic manipulator designed with
(A) Maximum float Cartesian co-ordinate systems has
@) Minimum float (A) three linear movements
(C) Zero float @) three rotational movements
a)) None of the aboJe •(C) two linear and one rotational
movements
65. For completion ofa project, the critical
a) two rotational and one linear
path of the network represents movement
(A) Minimumtime
@) Maximum time 70. The PUMA 560, a Programmable
(C) Maxinum cost Universal Machine for assembly robot
a)) MinimLm cost has the 6 degrees of freedom from `
(A) 3 revolute joints and 3 prismatic
66. Which one of the following represents joints
an event ?
(8) 2 revolutejoints and 4 prismatic
(A). Concrete cured joints
a) .Fixing of door (C) 4 revolute joints and 2 prismatic
(C) Plastering of walls joints
. a) Selectingsites a) 6 revolutejoints
67. The tool life equation is given by 71. Given the joint variables, q±,
` VT°.5 = const. If tool life is reduced to
determination of end effector' s position
one-fourth of its initial life, the
and orientation is known `as
percentage increase in cutting velocity is
(A) 1000/o (A) h.verse kinematics
@) 200% (8) Forward kinematics
(c) 125% (C) Backward kinematics
a) 80% a) None of the above
68. Word Robot was coined by a Czech 72. What is the name for space inside
novelist from a Czech word which a robotic manipulator operates ?
(A) Rabota (A) Envirorment
a) Rebota @) Spatialbase.
(C) Ribota
•J`ri' (C) Workenvelope
a) Robota
a) Exclusion zone
Series-A +
05
Text of page 12
73. The number ofmoveable joints in the 77 If z = *] + x2 is subjected to constraints
base, arm and end effector of the robot Xi + J;2 S 1, -3Jc[ + X2 S; 3 and xL S 0,
deterfues x2 > 0, then the maximum value of Z
(A) degrees offreedom occurs at
(8) payload capacity
(A) (i,i)
(C) operational limits
a3) (0,5)
a) flexibility
(C) Infeasible solution
@) None of these
74. Which part of the Robot
motion to the manipulator
78. ABC analysis helps segregating the
effectors ?
items and helps the organization to
(A) Controller control them. Amongst all items, A
items are
a) Sensor
(A) low .valued and constitute about
(C) Actuator 75% of total items.
0)) None of the above
a) account for 15-20% of the total
inventory and constitute about
15-20% of total items.
75. 0; in a serial robotic manipulator
(C) account for 70-80% of the total
according to Denavit-Hartenberg
inventory and constitute about
notation is
10% of total items.
(A) Rotation about x axis a) None of these
`03) Rotation aboutY axis
(C) Rotation aboutz axis The value of standard deviations v, are
used to decide the upper and lower
(D) None of the above
control liriits, 1o,limits occupy
(A) 99.73% of the areaofthe normal
76. According to Denavit-Hartenberg Curve
notationsjoint axis is taken as
a) 95.450/o of the area of the normal
(A) X axis of the frame Curve
a) Y axis of the frame (C) 100% of the area of the norlnal
Curve
(C) Z axis of the frame
a) 68.27% of the area of the normal
a) None of the above Curve
05 Series-A
Text of page 13
80. Process .charts are Value is the cost directly proportionate
represented by symbols to
symbol :
(A) Pace
(A)I a3) Product material
(C) Function
a)) All of the ab;ve
o3'O
84. Thepricepaidbythebuyer is
(c)V (A) Usevalue
a) Costvalue
(C) Esteemvalue
a)D • a) Exchangevalue
85. Who is named as Father of Value
81. A control chart indicates whether the
Analysis ?
process is in control or not. Following
is a process variability chart : (A) LaVIenceD. Miles
(8) FrankGilberth
(A) jEchart
(C) F.W. Taylor
a) pchart (D) Philip M. Morse
(C) np chart
a) cchart 86. Flowchart refers to a pictorial
representation of an algorithm. Various
symbols are used in a flow chart.
82. The cost reduction technique in Folloung5edboxdenotes
bomparison to the worth of a product is
kn Oun as
(A) Reverse Engineering
(A) Ihitiation
@) Value Engine'ering "
@) Input
(C) Material Engineering
(C) Output
a) Quality Engineering`.>. a) Decision
''!j
Series-A 05
Text of page 14
(
87. Nulnbers dfinstantaneous centres for a 90 In case of simple harmonic motion of a
follower (rise - 90°, dwell - 9o°, fall _
fo'urbarplanarkinematic.chainare
90°, rest - 900) the maximum velocity
of the follower will be
(A)4
@)5
(A)#
(C)6 (8)#
a)7 (c) 2#
co2s
@)fi
88. If three bodies haveplanarmotion, their
where, s -stoke of the follower
instantaneous centres lie on 0 - cam angle
co - angular velocity
(A) two parallel lines
91. Sensitiveness of a givvemor is defined
a3) two perpendicular lines
as
(C) two intersecting non-perpendicular N1 +N2
(A) N1 - N2
(D) on same straightline Nl -N2
a) Nl + N2
20V, -N2)
(C) Nl + N2
89. The degrees of freedom for the givqu
20V1 + N2)
planar mechanism will be
a) Nl - N2
NL, N2 are maximum and minimum
speed.
92. Addendum circle for a spur gear has a
(A)1
diameter\.equal to
a)2 (A) pitc`h circle diameter
a3) pitch circle diameter-2m
(C)3
(C) pitch circle diameter + 2m
a) None of the above
a) None of the above
05 Series-A
Text of page 15
93. Relationship between circular pitch pc 97. The locus of a point on a thread
and diametral .pitch Pd is unwound from a cylinder will be
(A) a straight line
(A) pc.pd-27t a) acircle
@, pc.pd-fl (C) ahelix
a)) aninvolute
1
(C) pc.pd-i
In viscous damping system,
a) pc-7,.Pd ri+ck+sr=0,overdampingQccurswhen
(A) ±,:
94. If two moving elements have surface
contact in motion, such a pair is known @) ±<:
as
(A) Lowerpair
(c) £,:
• (8) Higherpair a) None of the above
(C) Revolutepair 99. The frictional torque transmitted in a
(D) None of the above flat pivot bearing considering uniforln
pressure is
95. A closed links mechanism.will be an A, iHWR
assemblage of minimum
B, ZHWR
(A) 2links
@) 31inks. (c, iHWR
(C) 4links a) UWR
@) 51inks
100. If the rotating mass of a rim type
flywheel is distributed on another rim
96. Crowning on pulley helps type flywheel whose mean radius is
half the mean radius of the former, then
(A) in increasing velocityratio the energy stored in the latter at the
same speed will be
.(8) in decreasing the sli'PNofthe belt
(A) same as the first one
(C) in automatic adjustment of belt
@) two times the fist one
position so that belts run centrally
(C) fourtimes the first one
a)) None of the above../' .-.. / a) one fourth times the first one
Series-A 05
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 15
Source: Jharkhand Public Service Commission. Question paper published by Jharkhand Public Service Commission.