Machine Design 1000+ MCQ with answer for SSC MTS
Thursday 9th of March 2023
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1. The width of the pulley should be __________ width of the belt.
A. Equal to
B. Less than
C. Greater than
D. None of these
Answer : C
A. Equal to
B. Less than
C. Greater than
D. None of these
Answer : C
2. The elasticity is the property of a material which enables it to
A. Regains its original shape after deformation when the external forces are removed
B. Draw into wires by the application of a tensile force
C. Resists fracture due to high impact loads
D. Retain deformation produced under load permanently
Answer : A
A. Regains its original shape after deformation when the external forces are removed
B. Draw into wires by the application of a tensile force
C. Resists fracture due to high impact loads
D. Retain deformation produced under load permanently
Answer : A
3. A key way lowers
A. The strength of the shaft
B. The rigidity of the shaft
C. Both the strength and rigidity of the shaft
D. The ductility of the shaft
Answer : C
A. The strength of the shaft
B. The rigidity of the shaft
C. Both the strength and rigidity of the shaft
D. The ductility of the shaft
Answer : C
4. A sliding bearing in which although lubricant is present, the working surfaces __________ contact each other at least part of the time, is called boundary lubricated bearing.
A. Partially
B. Fully
C. Either A or B
D. None of these
Answer : A
A. Partially
B. Fully
C. Either A or B
D. None of these
Answer : A
5. The function of cutting oil when threading a pipe is to
A. Provide cooling action
B. Lubricate the dies
C. Help removes chips
D. All of the above
Answer : D
A. Provide cooling action
B. Lubricate the dies
C. Help removes chips
D. All of the above
Answer : D
6. The rolling contact bearings as compared to sliding contact bearings have
A. Low starting and low running friction except at very high speeds
B. Accuracy of shaft alignment
C. Small overall dimensions
D. All of the above
Answer : D
A. Low starting and low running friction except at very high speeds
B. Accuracy of shaft alignment
C. Small overall dimensions
D. All of the above
Answer : D
7. In a journal bearing, the load on the bearing is __________ to the axis of the journal.
A. Parallel
B. Perpendicular
C. Both A and B
D. None of these
Answer : B
A. Parallel
B. Perpendicular
C. Both A and B
D. None of these
Answer : B
8. A self locking screw has
A. Fine threads
B. Course threads
C. Coefficient of friction is greater than tangent of load angle
D. Hole for inserting split pin
Answer : C
A. Fine threads
B. Course threads
C. Coefficient of friction is greater than tangent of load angle
D. Hole for inserting split pin
Answer : C
9. Which of the following has threads at both ends?
A. Bolt
B. Tap bolt
C. Stud
D. None of these
Answer : C
A. Bolt
B. Tap bolt
C. Stud
D. None of these
Answer : C
10. The design of shafts made of brittle materials is based on
A. Guest's theory
B. Rankine's theory
C. St Venant's theory
D. Von Mises theory
Answer : B
A. Guest's theory
B. Rankine's theory
C. St Venant's theory
D. Von Mises theory
Answer : B
11. Which of the following property is essential for spring materials?
A. Stiffness
B. Ductility
C. Resilience
D. Plasticity
Answer : C
A. Stiffness
B. Ductility
C. Resilience
D. Plasticity
Answer : C
12. The sleeve or muff coupling is designed as a
A. Dun cylinder
B. Hollow shaft
C. Solid shaft
D. Thick cylinder
Answer : B
A. Dun cylinder
B. Hollow shaft
C. Solid shaft
D. Thick cylinder
Answer : B
13. A hollow saddle key is
A. A taper key which fits half in the key way of hub and half in the key way of shaft
B. A taper key which fits in a key way of the hub and is flat on the shaft
C. A taper key which fits in a key way of the hub and the bottom of the key is shaped to fit the curved surface of the shaft
D. Provided in pairs at right angles and each key is to withstand torsion in one direction only
Answer : C
A. A taper key which fits half in the key way of hub and half in the key way of shaft
B. A taper key which fits in a key way of the hub and is flat on the shaft
C. A taper key which fits in a key way of the hub and the bottom of the key is shaped to fit the curved surface of the shaft
D. Provided in pairs at right angles and each key is to withstand torsion in one direction only
Answer : C
14. The draw of cotter need not exceed
A. 3 mm
B. 5 mm
C. 10 mm
D. 20 mm
Answer : A
A. 3 mm
B. 5 mm
C. 10 mm
D. 20 mm
Answer : A
15. The power transmitted by belt drive depends upon
A. Belt velocity
B. Initial belt tension
C. Arc of contact
D. All of the above
Answer : D
A. Belt velocity
B. Initial belt tension
C. Arc of contact
D. All of the above
Answer : D
16. A key made from a cylindrical disc having segmental cross-section, is known as
A. Woodruff key
B. Feather key
C. Flat saddle key
D. Gib head key
Answer : A
A. Woodruff key
B. Feather key
C. Flat saddle key
D. Gib head key
Answer : A
17. The resistance to fatigue of a material is measured by
A. Elastic limit
B. Ultimate tensile strength
C. Young's modulus
D. Endurance limit
Answer : D
A. Elastic limit
B. Ultimate tensile strength
C. Young's modulus
D. Endurance limit
Answer : D
18. Endurance limit or fatigue limit is the maximum stress that a member can withstand for an infinite number of load applications without failure when subjected to
A. Dynamic loading
B. Static loading
C. Combined static and dynamic loading
D. Completely reversed loading
Answer : D
A. Dynamic loading
B. Static loading
C. Combined static and dynamic loading
D. Completely reversed loading
Answer : D
19. A stud
A. Has a head on one end and a nut fitted to the other
B. Has head at one end and other end fits into a tapped hole in the other part to be joined
C. Has both the ends threaded
D. Has pointed threads
Answer : C
A. Has a head on one end and a nut fitted to the other
B. Has head at one end and other end fits into a tapped hole in the other part to be joined
C. Has both the ends threaded
D. Has pointed threads
Answer : C
20. When bevel gears having equal teeth and equal pitch angles connect two shafts whose axes intersect at right angle, then they are known as
A. Angular bevel gears
B. Crown bevel gears
C. Internal bevel gears
D. Mitre gears
Answer : D
A. Angular bevel gears
B. Crown bevel gears
C. Internal bevel gears
D. Mitre gears
Answer : D
21. The material generally used for aircraft components is
A. Mild steel
B. High speed steel
C. Stainless steel
D. Aluminium
Answer : D
A. Mild steel
B. High speed steel
C. Stainless steel
D. Aluminium
Answer : D
22. In helical gears, the distance parallel to the axis, between similar faces of adjacent teeth, is called
A. Normal pitch
B. Axial pitch
C. Diametral pitch
D. Module
Answer : B
A. Normal pitch
B. Axial pitch
C. Diametral pitch
D. Module
Answer : B
23. The helix angle for single helical gears ranges from
A. 10° to 15°
B. 15° to 20°
C. 20° to 35°
D. 35° to 50°
Answer : C
A. 10° to 15°
B. 15° to 20°
C. 20° to 35°
D. 35° to 50°
Answer : C
24. A transmission shaft includes
A. Over head shaft
B. Counter shaft
C. Line shaft
D. All of these
Answer : D
A. Over head shaft
B. Counter shaft
C. Line shaft
D. All of these
Answer : D
25. In a transverse fillet welded joint, the size of weld is __________ the throat of weld.
A. 0.5 times
B. Equal to
C. 2 times
D. Double
Answer : C
A. 0.5 times
B. Equal to
C. 2 times
D. Double
Answer : C
26. A locking device extensively used in marine type connecting rod ends is a
A. Jam nut
B. Castle nut
C. Sawn nut
D. Ring nut
Answer : D
A. Jam nut
B. Castle nut
C. Sawn nut
D. Ring nut
Answer : D
27. A shaft is subjected to a maximum bending stress of 80 N/mm² and maximum shearing stress equal to 30 N/mm² at a particular section. If the yield point in tension of the material is 280 N/mm² and the maximum shear stress theory of failure is used, then the factor of safety obtained will be
A. 2.5
B. 2.8
C. 3.0
D. 3.5
Answer : B
A. 2.5
B. 2.8
C. 3.0
D. 3.5
Answer : B
28. The ball bearings are provided with a cage
A. To reduce friction
B. To facilitate slipping of balls
C. To prevent the lubricant from flowing out
D. To maintain the balls at a fixed distance apart
Answer : D
A. To reduce friction
B. To facilitate slipping of balls
C. To prevent the lubricant from flowing out
D. To maintain the balls at a fixed distance apart
Answer : D
29. If a shaft made from ductile material is subjected to combined bending and twisting moment, calculations based on which one of the following failure theories will give the most conservative value?
A. Maximum principal stress theory
B. Maximum shear stress theory
C. Maximum strain energy theory
D. Maximum distortion energy theory
Answer : A
A. Maximum principal stress theory
B. Maximum shear stress theory
C. Maximum strain energy theory
D. Maximum distortion energy theory
Answer : A
30. For a bevel gear having the pitch angle ?, the ratio of formative number of teeth (TE) to actual number of teeth (T) is
A. 1/sin?
B. 1/cos?
C. 1/tan?
D. sin? cos?
Answer : B
A. 1/sin?
B. 1/cos?
C. 1/tan?
D. sin? cos?
Answer : B
31. Lewis equation in gears is used to find the
A. Tensile stress in bending
B. Shear stress
C. Compressive stress in bending
D. Fatigue stress
Answer : C
A. Tensile stress in bending
B. Shear stress
C. Compressive stress in bending
D. Fatigue stress
Answer : C
32. The helix angle for double helical gears may be made up to
A. 45°
B. 60°
C. 75°
D. 90°
Answer : A
A. 45°
B. 60°
C. 75°
D. 90°
Answer : A
33. In order to ensure self locking in a screw jack, it is essential that helix angle is __________ friction angle.
A. Larger than
B. Smaller than
C. Equal to
D. None of these
Answer : B
A. Larger than
B. Smaller than
C. Equal to
D. None of these
Answer : B
34. The expansion joint is mostly used for pipes which carry steam at __________ pressures.
A. Low
B. High
C. Medium
D. None of these
Answer : B
A. Low
B. High
C. Medium
D. None of these
Answer : B
35. Which process will increase the fatigue duration of parts?
A. Finishing and polishing
B. Shotpeening
C. De-carburisation
D. Electroplating
Answer : B
A. Finishing and polishing
B. Shotpeening
C. De-carburisation
D. Electroplating
Answer : B
36. The bearings of heavy series have capacity ________ over the medium series.
A. 20 to 30%
B. 10 to 20%
C. 30 to 40%
D. 40 to 50%
Answer : A
A. 20 to 30%
B. 10 to 20%
C. 30 to 40%
D. 40 to 50%
Answer : A
37. Crushing resistance required to crush the rivet per pitch length is
A. p.d.?c
B. p.t.?c
C. n.d.t.?c
D. (p - d) t.?c
Answer : C
A. p.d.?c
B. p.t.?c
C. n.d.t.?c
D. (p - d) t.?c
Answer : C
38. The coefficient of friction between the belt and pulley depends upon the
A. Material of belt and pulley
B. Slip of belt
C. Speed of belt
D. All of these
Answer : D
A. Material of belt and pulley
B. Slip of belt
C. Speed of belt
D. All of these
Answer : D
39. In composite or reverse laid ropes
A. Direction of twist of wires in strands is opposite to the direction of twist of strands
B. Direction of twist of wires and strands are same
C. Wires in two adjacent strands are twisted in opposite direction
D. Wires are not twisted
Answer : C
A. Direction of twist of wires in strands is opposite to the direction of twist of strands
B. Direction of twist of wires and strands are same
C. Wires in two adjacent strands are twisted in opposite direction
D. Wires are not twisted
Answer : C
40. Taper on the cotter and slot is provided
A. On both the sides
B. On one side only
C. On none of the sides
D. May be provided anywhere
Answer : B
A. On both the sides
B. On one side only
C. On none of the sides
D. May be provided anywhere
Answer : B
41. In a belt drive, if the pulley diameter is doubled keeping the tension and belt width constant, then it will be necessary to
A. Increase the key length
B. Increase the key depth
C. Increase the key width
D. Decrease the key length
Answer : A
A. Increase the key length
B. Increase the key depth
C. Increase the key width
D. Decrease the key length
Answer : A
42. A machine part subjected to __________ is called a strut.
A. An axial compressive force
B. A tangential force
C. An axial tensile force
D. Any one of these
Answer : A
A. An axial compressive force
B. A tangential force
C. An axial tensile force
D. Any one of these
Answer : A
43. If the centre distance of the mating gears having involute teeth is varied within limits, the velocity ratio.
A. Increases
B. Decreases
C. Remains unchanged
D. None of these
Answer : C
A. Increases
B. Decreases
C. Remains unchanged
D. None of these
Answer : C
44. A connecting rod subjected to an axial load may buckle with
A. X-axis as neutral axis
B. Y-axis as neutral axis
C. X-axis or Y-axis as neutral axis
D. Z-axis
Answer : C
A. X-axis as neutral axis
B. Y-axis as neutral axis
C. X-axis or Y-axis as neutral axis
D. Z-axis
Answer : C
45. A spring is used to
A. Measure forces
B. Apply forces
C. Store energy
D. All of these
Answer : D
A. Measure forces
B. Apply forces
C. Store energy
D. All of these
Answer : D
46. Silver based solder is used for
A. Flaring
B. Brazing
C. Soft soldering
D. Fusion welding
Answer : B
A. Flaring
B. Brazing
C. Soft soldering
D. Fusion welding
Answer : B
47. When carbon in the cast iron is principally in the form of graphite, the cast iron will be of
A. Brown colour
B. Yellow colour
C. White colour
D. Grey colour
Answer : D
A. Brown colour
B. Yellow colour
C. White colour
D. Grey colour
Answer : D
48. Split nut is a locking device in which
A. One smaller nut is tightened over main nut and main nut tightened against smaller one by loosening, creating friction jamming
B. A slot is cut partly in middle of nut and then slot reduced by tightening screw
C. A hard fibre or nylon cotter is recessed in the nut and becomes threaded as the nut is screwed on the bolt causing a tight grip
D. Through slots are made at top and a cotter pin is passed through these and a hole in the bolt, and cotter pin splitted and bent in reverse direction at the other end
Answer : B
A. One smaller nut is tightened over main nut and main nut tightened against smaller one by loosening, creating friction jamming
B. A slot is cut partly in middle of nut and then slot reduced by tightening screw
C. A hard fibre or nylon cotter is recessed in the nut and becomes threaded as the nut is screwed on the bolt causing a tight grip
D. Through slots are made at top and a cotter pin is passed through these and a hole in the bolt, and cotter pin splitted and bent in reverse direction at the other end
Answer : B
49. The velocity of sliding ________ the distance of the point of contact from the pitch point.
A. Is directly proportional to
B. Is inversely proportional to
C. Is equal to cos ? multiplied by
D. Does not depend upon
Answer : A
A. Is directly proportional to
B. Is inversely proportional to
C. Is equal to cos ? multiplied by
D. Does not depend upon
Answer : A
50. The acme threads are usually found on
A. Spindles of bench vices
B. Railway carriage couplings
C. Feed mechanism of machine tools
D. Screw cutting lathes
Answer : D
A. Spindles of bench vices
B. Railway carriage couplings
C. Feed mechanism of machine tools
D. Screw cutting lathes
Answer : D
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