BPSC AE 2024: Assistant Engineer (Civil/Mechanical/Electrical) (Advt. 33/2024), Paper VI Mechanical Engineering II
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Booklet Serial No.
22/AE/CM/M –2024-06
Booklet Series Question Booklet
W
MECHANICAL ENGINEERING – II
Paper – VI Candidate’s Roll Number
Time Allowed : 01 Hour Maximum Marks : 100
Read the following instructions carefully before you begin to answer the questions.
IMPORTANT INSTRUCTIONS
1. This Question Booklet contains 50 questions in all.
2. All questions carry equal marks.
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1. The rate of decay of oscillations is 4. Directional solidification in castings
known as can be improved by
(A) Transmissibility (A) Chills and Padding
(B) Damping coefficient (B) Chaplets and Padding
(C) Logarithmic decrement (C) Chills, Chaplets and Padding
(D) Critical damping (D) Chills and Chaplets
2. The variation of circumferential 5. Work study is concerned with
stress across the thickness of a thick
cylinder is (A) Improving present method and
finding standard time
(A) Uniform
(B) Linear (B) Improving production capability
(C) Parabolic (C) Motivation of workers
(D) None of the above
(D) None of the above
3. A closed coil helical spring is subjected
6. In a fillet welded joint, the weakest
to a torque about its axis. The spring
area of the weld is
wire would experience a
(A) Root
(A) Bending stress
(B) Face
(B) Torsional shear stress
(C) Direct tensile stress (C) Throat
(D) Direct shear stress (D) Toe
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7. What is the name of a system which 10. The interference in involute spur gears
brings together several manufacturing
will increase when
operations into a coherent system ?
(A) Automated integration systems (A) The pressure angle is increased
(B) Flexible manufacturing systems
(B) The module is increased
(C) Focused integration systems
(D) Portable manufacturing systems (C) The centre distance is increased
(D) The number of teeth on the pinion
8. Two 1 mm thick steel sheets are to be
spot welded at a current of 5000 A. are reduced
Assuming effective resistance to be
200 ohm and current flow time of
0.2 second, heat generated during the
process will be
11. A helical compression spring of
(A) 1000 Joule stiffness K is cut into two pieces, each
(B) 500 Joule having equal number of turns and kept
side-by-side under compression. The
(C) 0.2 Joule
equivalent spring stiffness of this new
(D) 0 Joule
arrangement is equal to
9. In industrial engineering, application,
(A) K
PERT has
(A) Two time estimate
(B) 2 K
(B) Four time estimate
(C) 0.5 K
(C) Three time estimate
(D) One time estimate (D) 4 K
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12. The stress induced in a body, when 15. When the shafts are slightly misaligned
suddenly loaded, is _____________ the then most suitable coupling to connect
stress induced when the same load is them as
applied gradually.
(A) Rigid coupling
(A) Twice
(B) Flexible coupling
(B) One-half
(C) Four times (C) Oldham-hook coupling
(D) Equal to
(D) None of these
13. When two streams of molten metal do
16. Failure of material is called fatigue
not fuse with each other during casting
when it fails
of an automobiles part, the defect is
known as (A) Below the elastic limit
(A) Cold shut (B) At the yield point
(B) Scab
(C) Below the yield point
(C) Dry shut
(D) At the elastic limit
(D) Pore
17. CPM is the
14. Brasses and bronze are welded using
(A) Activity-oriented technique
(A) Reducing flame
(B) Event-oriented technique
(B) Carburizing flame
(C) Target-oriented technique
(C) Oxidizing flame
(D) Neutral flame (D) Time-oriented technique
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18. If coefficient of speed f luctuation 21. Hoop stress in a thin cylinder of
is 0.05 then ratio of maximum to
diameter ‘d’ and thickness ‘t’ subjected
minimum speed is
to pressure ‘p’ will be
(A) 1.10
pd
(B) 1.05 (A)
2t
(C) 1.01 (B) pd
t
(D) 1.15
2pd
(C)
t
19. If the ratio of rivet hole to the pitch of pd
(D)
rivet is 0.25, then the tearing efficiency 4t
of the joint is
22. While machining which of the following
(A) 0.25
improves surface finish ?
(B) 0.75
(A) Increased feed rate
(C) 0.87
(B) Increased cutting speed
(D) 0.5 (C) Formation of built up edge
(D) Increased depth of cut
20. Whirling speed of a shaft coincides
with the natural frequency of its
23. If the radius of wire stretched by a load
is doubled, then its Young’s Modulus
(A) Transverse vibration
will be
(B) Coupled bending vibration (A) Becomes four times
(B) Halved
(C) Longitudinal vibration
(C) Unaffected
(D) Torsional vibration
(D) Doubled
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24. Which of the following is an example of 27. Removing dull grains in order to make
thermosetting plastics ? grinding wheel sharp is known as
(A) Polyvinyl Chloride (PVC) (A) Dressing
(B) Bakelite (B) Glazing
(C) Celluloid
(C) Trueing
(D) Polythene
(D) Loading
25. Pitch point on cam is
28. Tool life is generally better when
(A) Any point on pitch circle
(A) Grain size of the metal is large
(B) The point on cam pitch curve
having maximum pressure angle (B) Hard constituents are present in the
microstructure of the tool material
(C) The point on cam pitch curve having
minimum pressure angle
(C) Grain size of the metal is small
(D) Any point on pitch curve
(D) None of the above
26. A material capable of absorbing large
amount of energy before fracture is 29. The failure of a key is due to
known as
(A) Bending
(A) Resilience
(B) Tension
(B) Toughness
(C) Plasticity (C) Twisting
(D) Ductility (D) Shearing
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30. A transmission shaft subjected to 33. If Poisson’s ratio of a material is
0.5, then the elastic modulus for the
bending and torsional moments should
material is
be designed on the basis of
(A) Equal to its shear modulus
(A) Maximum principal stress theory
(B) 4 times its shear modulus
(B) Permissible bearing pressure
(C) Indeterminate
(C) Maximum shear stress theory
(D) 3 times its shear modulus
(D) None of the mentioned above
34. _________ is the phenomenon of slow
31. A cam in which the follower reciprocates
extension of the material at a constant
or oscillates in a plane parallel to the
load during tensile test.
axis of the cam is known as
(A) Breaking
(A) Reciprocating cam
(B) Creeping
(B) Circular cam
(C) Plasticity
(C) Tangent cam
(D) Yielding
(D) Cylindrical cam
35. In a steam engine, the valve rod is
32. Which of the following locating device connected to an eccentric rod by
is used to locate cylindrical jobs ? means of
(A) V-blocks (A) Universal joint
(B) Angle plates (B) Knuckle joint
(C) Metal pins (C) Flange coupling
(D) Drill jigs (D) Cotter joint
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36. In value engineering, the term value 39. A shaft directly coupled to a power
refers to source is called
(A) Total cost of the product (A) Line shaft
(B) Selling price of the product (B) Counter shaft
(C) Utility of the product (C) Jack shaft
(D) Manufacturing cost of the product (D) Flexible shaft
37. Major constituents of stellite are 40. In CNC programming G-code used
for circular interpolation (counter
(A) Zinc, Lead and Tin
clockwise) is
(B) Nickel, Copper and Zinc
(A) G 01
(C) Cobalt, Chromium, Tungsten
(B) G 02
(D) Cobalt, Vanadium and Nickel
(C) G 00
(D) G 03
38. An optimum project schedule implies
(A) Lowest possible cost and shortest 41. In a turning moment diagram, the
possible time of project variations of energy above and below
the mean resisting torque line is called
(B) Timely execution of project
(A) Fluctuation of energy
(C) To produce best results under given
(B) Coefficient of fluctuation of energy
constraints
(C) Maximum fluctuation of energy
(D) Optimum utilization of men,
(D) None of the above
machines and materials
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42. Two beams of equal cross section 45. Motion and time study in case of
area are subjected to equal bending
moment. If one beam has square cross product analysis involves
section and the other has circular
section, then
(A) Man operation chart
(A) Circular section beam will be
stronger
(B) Work place layout
(B) Square cross section beam will be
stronger
(C) Depends on the loading condition (C) Multi man operation chart
(D) Both the beams will be equally
strong (D) Process chart
43. Machine tool guideways are usually
hardened by
46. In a computer numerical controlled
(A) Induction hardening
turning center, the backlash error
(B) Martempering
(C) Flame hardening during longitudinal feed motion is
(D) Vacuum hardening accomplished by
44. The cutting force in punching and (A) Gears
blanking operations mainly depends on
(A) The bulk modulus of material (B) Recirculating ballscrew and nut
(B) The shear strength of material
(C) Worm wheels
(C) The yield strength of material
(D) The modulus of elasticity of (D) Pulley and belt
material
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47. The motion of a nut on a threaded 49. Section modulus (Z) of a beam
bolt is
depends on
(A) Plane
(A) Only on length of the beam
(B) Helical
(B) Weight of the beam
(C) Spherical
(D) None of the above (C) Density of the beam
(D) The geometry of the cross section
48. In an automobile, if the vehicle makes
a left turn, the gyroscopic torque
(A) Increase the forces on the outer 50. Manganese in steel increases its
wheels
(A) Ductility
(B) Does not affect the forces on the
outer wheels
(B) Hardness
(C) Decreases the forces on the outer
(C) Fluidity
wheels
(D) None of these (D) Tensile strength
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SPACE FOR ROUGH WORK 22/AE/CM/M– 2024-06/W 11 [ P.T.O.
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SPACE FOR ROUGH WORK 22/AE/CM/M– 2024-06/W 12
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Bihar Public Service Commission, Patna
Advt. No. 33/2024, Mechanical Engineering - II, Paper - VI
Assistant Engineer, Mechanical Written (Objective)
Competitive Examination
Final Answer key (Set – W)
Question No. Ans. Key Question No. Ans. Key
1 C 26 B
2 C 27 A
3 A 28 Deleted
4 A 29 D
5 A 30 C
6 C 31 D
7 B 32 A
8 A 33 D
9 C 34 B
10 D 35 B
11 D 36 C
12 A 37 C
13 A 38 A
14 C 39 A
15 B 40 D
16 C 41 A
17 A 42 B
18 B 43 C
19 B 44 B
20 A 45 D
21 A 46 B
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Question No. Ans. Key Question No. Ans. Key
22 B 47 B
23 C 48 A
24 B 49 D
25 B 50 D
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(Set – X)
Question No. Ans. Key Question No. Ans. Key
1 D 26 C
2 B 27 C
3 B 28 B
4 A 29 C
5 C 30 A
6 C 31 D
7 A 32 C
8 D 33 A
9 D 34 B
10 C 35 B
11 A 36 D
12 B 37 D
13 C 38 A
14 A 39 C
15 A 40 B
16 C 41 B
17 C 42 B
18 A 43 B
19 C 44 B
20 D 45 C
21 D 46 D
22 D 47 A
23 B 48 D
24 A 49 C
25 Deleted 50 D
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(Set – Y)
Question No. Ans. Key Question No. Ans. Key
1 B 26 B
2 D 27 B
3 D 28 C
4 A 29 A
5 B 30 D
6 A 31 B
7 B 32 Deleted
8 C 33 A
9 D 34 B
10 A 35 B
11 D 36 B
12 A 37 B
13 A 38 C
14 D 39 A
15 C 40 B
16 B 41 D
17 A 42 A
18 C 43 A
19 C 44 C
20 C 45 D
21 A 46 B
22 B 47 A
23 C 48 A
24 D 49 C
25 C 50 C
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(Set – Z)
Question No. Ans. Key Question No. Ans. Key
1 C 26 C
2 A 27 D
3 B 28 A
4 A 29 A
5 C 30 C
6 C 31 B
7 C 32 D
8 C 33 C
9 D 34 D
10 B 35 A
11 D 36 A
12 C 37 D
13 Deleted 38 C
14 B 39 C
15 C 40 A
16 B 41 D
17 B 42 A
18 D 43 B
19 B 44 D
20 A 45 B
21 C 46 D
22 D 47 D
23 B 48 B
24 A 49 A
25 C 50 B
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Question sequence as per Set-W
Set-W Set-X Set-Y Set-Z
2 18 17 26
28 25 32 13
Reasons as per Set-W
Q. No. 02- No Change.
Reason :- The variation of circumferential stress across the thickness of a
thick cylinder is parabolic in nature.
Q. No. 28- Deleted
Reason :- Option (A) and (C) do not identify whether the metal
mentioned here is work piece or tool material. So the question is
not complete.Page 1 of 12
Source: Bihar Public Service Commission. Question paper published by Bihar Public Service Commission.