Machine Design 1000+ MCQ with answer for FCI Recruitment
Thursday 9th of March 2023
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1. A hot short metal is
A. Brittle when cold
B. Brittle when hot
C. Brittle under all conditions
D. Ductile at high temperature
Answer : B
A. Brittle when cold
B. Brittle when hot
C. Brittle under all conditions
D. Ductile at high temperature
Answer : B
2. Which of the following is a permanent fastening?
A. Bolts
B. Keys
C. Cotters
D. Rivets
Answer : D
A. Bolts
B. Keys
C. Cotters
D. Rivets
Answer : D
3. When a bolt is subjected to shock loading, the resilience of the bolt should be considered in order to prevent breakage at the
A. Thread
B. Middle
C. Shank
D. Head
Answer : A
A. Thread
B. Middle
C. Shank
D. Head
Answer : A
4. Which of the following statement is wrong?
A. The pitch of rivets is obtained by equating the tearing resistance of the plate to the shearing resistance of the rivets
B. The pitch of rivets should not be less than 2d, where d is the diameter of rivet hole
C. The maximum value of the pitch of rivets for a longitudinal joint of a boiler, as per I.B.R., is given by Pmax = C.t + 41.28 mm
D. According to I.B.R., the thickness of butt strap shall not be less than 5 mm
Answer : D
A. The pitch of rivets is obtained by equating the tearing resistance of the plate to the shearing resistance of the rivets
B. The pitch of rivets should not be less than 2d, where d is the diameter of rivet hole
C. The maximum value of the pitch of rivets for a longitudinal joint of a boiler, as per I.B.R., is given by Pmax = C.t + 41.28 mm
D. According to I.B.R., the thickness of butt strap shall not be less than 5 mm
Answer : D
5. Lewis form factor for 14 ½° composite and full depth involute system is (where T = Number of teeth)
A. 0.124 - (0.684/T)
B. 0.154 - (0.912/T)
C. 0.175 - (0.841/T)
D. None of these
Answer : A
A. 0.124 - (0.684/T)
B. 0.154 - (0.912/T)
C. 0.175 - (0.841/T)
D. None of these
Answer : A
6. 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
7. 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
8. Rankine's theory is used for
A. Brittle materials
B. Ductile materials
C. Elastic materials
D. Plastic materials
Answer : A
A. Brittle materials
B. Ductile materials
C. Elastic materials
D. Plastic materials
Answer : A
9. The material commonly used for crane hooks is
A. Cast iron
B. Wrought iron
C. Mild steel
D. Aluminium
Answer : B
A. Cast iron
B. Wrought iron
C. Mild steel
D. Aluminium
Answer : B
10. The deflection of a cantilever beam under load W is 8. If its width is halved, then the deflection under load W will be
A. 2/8
B. 8/2
C. 4/8
D. 8/4
Answer : C
A. 2/8
B. 8/2
C. 4/8
D. 8/4
Answer : C
11. The permissible stress for carbon steel under static loading is generally taken as
A. 2000-3000 kg/m²
B. 3000-4000 kg/cm²
C. 4000-4500 kg/cm²
D. 7500-10,000 kg/cm²
Answer : C
A. 2000-3000 kg/m²
B. 3000-4000 kg/cm²
C. 4000-4500 kg/cm²
D. 7500-10,000 kg/cm²
Answer : C
12. In a marine flange coupling, the pitch circle diameter of bolts is taken as
A. 1.2 d
B. 1.6 d
C. 2d
D. 2.5 d
Answer : B
A. 1.2 d
B. 1.6 d
C. 2d
D. 2.5 d
Answer : B
13. In the case of an elastic bar fixed at upper end and loaded by a falling weight at lower end, the shock load produced can be decreased by
A. Decreasing the cross-section area of bar
B. Increasing the cross-section area of bar
C. Remain unaffected with cross-section area
D. Would depend upon other factors
Answer : A
A. Decreasing the cross-section area of bar
B. Increasing the cross-section area of bar
C. Remain unaffected with cross-section area
D. Would depend upon other factors
Answer : A
14. Tearing resistance required to tear off the plate per pitch length is (where p = Pitch of rivets, d = Dia. of rivet hole, and ?t = Permissible tensile stress for plate material)
A. p.d.?t
B. p.t.?t
C. (p - d) ?t
D. (p - d) t.?t
Answer : D
A. p.d.?t
B. p.t.?t
C. (p - d) ?t
D. (p - d) t.?t
Answer : D
15. In a band and block brake, the ratio of tensions on the tight and slack sides of band is given by (where ? = Coefficient of friction between the blocks and the drum, ? = Semi-angle of each block subtending at the centre of drum, and n = Number of blocks)
A. T?/T? = ?? × n
B. T?/T? = (??)n
C. T?/T? = [(1 - ? tan?)/ (1 + ? tan?)]n
D. T?/T? = [(1 + ? tan?)/ (1 - ? tan?)]n
Answer : D
A. T?/T? = ?? × n
B. T?/T? = (??)n
C. T?/T? = [(1 - ? tan?)/ (1 + ? tan?)]n
D. T?/T? = [(1 + ? tan?)/ (1 - ? tan?)]n
Answer : D
16. For a square key made of mild steel, the shear and crushing strength are related as
A. Shear strength is equal to crushing strength
B. Shear strength is greater than crushing strength
C. Shear strength is less than crushing strength
D. None of the above
Answer : A
A. Shear strength is equal to crushing strength
B. Shear strength is greater than crushing strength
C. Shear strength is less than crushing strength
D. None of the above
Answer : A
17. The number of slots in a 25 mm castle nut is
A. 8
B. 4
C. 2
D. 6
Answer : D
A. 8
B. 4
C. 2
D. 6
Answer : D
18. A localised compressive stress at the area of contact between two members is known as
A. Tensile stress
B. Bending stress
C. Bearing stress
D. Shear stress
Answer : C
A. Tensile stress
B. Bending stress
C. Bearing stress
D. Shear stress
Answer : C
19. Which of the following statement is correct regarding power screws?
A. The efficiency of a self locking screw can not be more than 50%
B. The efficiency of Acme (trapezoidal) thread is less than that of a square thread
C. If the friction angle is less than the helix angle of the screw, then the efficiency will be more than 50%
D. (A) and (B) Only
Answer : D
A. The efficiency of a self locking screw can not be more than 50%
B. The efficiency of Acme (trapezoidal) thread is less than that of a square thread
C. If the friction angle is less than the helix angle of the screw, then the efficiency will be more than 50%
D. (A) and (B) Only
Answer : D
20. The included angle for the V-belt is usually
A. 10°-20°
B. 30°-40°
C. 40°-60°
D. 60°-80°
Answer : B
A. 10°-20°
B. 30°-40°
C. 40°-60°
D. 60°-80°
Answer : B
21. Which of the following cotter joint will be used to connect strap end of a connecting rod?
A. Spigot and socket cotter joint
B. Sleeve and cotter joint C. Gib and cotter joint
D. Any one of these
Answer : C
A. Spigot and socket cotter joint
B. Sleeve and cotter joint C. Gib and cotter joint
D. Any one of these
Answer : C
22. In second type of levers,
A. Load is in between the fulcrum and effort
B. Effort is in between the fulcrum and load
C. Fulcrum is in between the load and effort
D. None of these
Answer : A
A. Load is in between the fulcrum and effort
B. Effort is in between the fulcrum and load
C. Fulcrum is in between the load and effort
D. None of these
Answer : A
23. The most important dimension in the design of a nut is
A. Pitch diameter
B. Inside diameter
C. Outside diameter
D. Height
Answer : D
A. Pitch diameter
B. Inside diameter
C. Outside diameter
D. Height
Answer : D
24. 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
25. If the size of a standard specimen for a fatigue testing machine is increased, the endurance limit for the material will
A. Have same value as that of standard specimen
B. Increase
C. Decrease
D. None of these
Answer : C
A. Have same value as that of standard specimen
B. Increase
C. Decrease
D. None of these
Answer : C
26. According to Indian standards, total numbers of fundamental deviations are
A. 10
B. 15
C. 20
D. 25
Answer : D
A. 10
B. 15
C. 20
D. 25
Answer : D
27. 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
28. Which of the following pipe joints would be suitable for pipes carrying steam?
A. Flanged
B. Threaded
C. Bell and spigot
D. Expansion
Answer : D
A. Flanged
B. Threaded
C. Bell and spigot
D. Expansion
Answer : D
29. If T is the actual number of teeth on a helical gear and ? is the helix angle for the teeth, then formative number of teeth is written as
A. T sec3?
B. T sec²?
C. T/sec3?
D. T cosec?
Answer : A
A. T sec3?
B. T sec²?
C. T/sec3?
D. T cosec?
Answer : A
30. 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
31. For longitudinal joint in boilers, the type of joint used is
A. Butt joint with single cover plate
B. Butt joint with double cover plate
C. Lap joint with one ring overlapping the other
D. Any one of the above
Answer : B
A. Butt joint with single cover plate
B. Butt joint with double cover plate
C. Lap joint with one ring overlapping the other
D. Any one of the above
Answer : B
32. The ratio of driving tensions in V-belt drives is __________ flat belt drives.
A. Equal to
B. sin? times more than
C. sin? times less than
D. cosec? times more than
Answer : D
A. Equal to
B. sin? times more than
C. sin? times less than
D. cosec? times more than
Answer : D
33. In designing a connecting rod, it is considered like __________ for buckling about Y-axis.
A. Both ends hinged
B. Both ends fixed
C. One end fixed and the other end hinged
D. One end fixed and the other end free
Answer : B
A. Both ends hinged
B. Both ends fixed
C. One end fixed and the other end hinged
D. One end fixed and the other end free
Answer : B
34. Cap screws are
A. Similar to small size tap bolts except that a greater variety of shapes of heads are available
B. Slotted for a screw driver and generally used with a nut
C. Used to prevent relative motion between parts
D. Provided with detachable caps
Answer : A
A. Similar to small size tap bolts except that a greater variety of shapes of heads are available
B. Slotted for a screw driver and generally used with a nut
C. Used to prevent relative motion between parts
D. Provided with detachable caps
Answer : A
35. The strap end of a connecting rod of steam engine is joined by
A. Gib of cotter joint
B. Sleeve and cotter joint
C. Spigot socket cotter joint
D. Knuckle joint
Answer : A
A. Gib of cotter joint
B. Sleeve and cotter joint
C. Spigot socket cotter joint
D. Knuckle joint
Answer : A
36. The arms of the pulleys for flat belt drive have
A. Elliptical cross-section
B. Major axis in plane of rotation
C. Major axis twice the minor axis
D. All the three characteristics
Answer : D
A. Elliptical cross-section
B. Major axis in plane of rotation
C. Major axis twice the minor axis
D. All the three characteristics
Answer : D
37. The stress induced in the belt is,
A. Tensile stress
B. Compressive stress
C. Direct shear stress
D. Torsional shear stress
Answer : A
A. Tensile stress
B. Compressive stress
C. Direct shear stress
D. Torsional shear stress
Answer : A
38. The process extensively used for making bolts and nuts is
A. Hot piercing
B. Extrusion
C. Cold peening
D. Cold heading
Answer : D
A. Hot piercing
B. Extrusion
C. Cold peening
D. Cold heading
Answer : D
39. 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
40. Which of the following screw thread is adopted for power transmission in either direction?
A. Acme threads
B. Square threads
C. Buttress threads
D. Multiple threads
Answer : B
A. Acme threads
B. Square threads
C. Buttress threads
D. Multiple threads
Answer : B
41. The rivet head used for boiler plate riveting is usually
A. Pan Head
B. Snap head
C. Counter sunk head
D. Conical head
Answer : B
A. Pan Head
B. Snap head
C. Counter sunk head
D. Conical head
Answer : B
42. The size of a gear is usually specified by
A. Pressure angle
B. Pitch circle diameter
C. Circular pitch
D. Diametral pitch
Answer : B
A. Pressure angle
B. Pitch circle diameter
C. Circular pitch
D. Diametral pitch
Answer : B
43. The property of a material which enables it to resist fracture due to high impact loads is known as
A. Elasticity
B. Endurance
C. Strength
D. Toughness
Answer : D
A. Elasticity
B. Endurance
C. Strength
D. Toughness
Answer : D
44. The strength of a riveted joint is equal to
A. Tearing strength of plate (Pt)
B. Shearing strength of rivet (Ps)
C. Crushing strength of rivet (Pc)
D. Least value of Pt Ps and Pc
Answer : D
A. Tearing strength of plate (Pt)
C. Crushing strength of rivet (Pc)
D. Least value of Pt Ps and Pc
Answer : D
45. The velocity factor for very accurately cut and ground metallic gears operating at velocities upto __________ are equal to 6/(6 + v).
A. 10 m/s
B. 12.5 m/s
C. 15 m/s
D. 20 m/s
Answer : D
A. 10 m/s
B. 12.5 m/s
C. 15 m/s
D. 20 m/s
Answer : D
46. The condition for maximum power transmission is that the maximum tension in the flat belt should be equal to
A. 3 Pc
B. Pc
C. Pc/3
D. 2 Pc Where, Pc = tension in belt due to centrifugal force
Answer : A
A. 3 Pc
B. Pc
C. Pc/3
D. 2 Pc Where, Pc = tension in belt due to centrifugal force
Answer : A
47. 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
48. 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
49. The crest diameter of a screw thread is same as
A. Major diameter
B. Minor diameter
C. Pitch diameter
D. Core diameter
Answer : A
A. Major diameter
B. Minor diameter
C. Pitch diameter
D. Core diameter
Answer : A
50. A crankshaft is a __________ shaft.
A. Transmission
B. Machine
C. Machine frame
D. None of these
Answer : B
A. Transmission
B. Machine
C. Machine frame
D. None of these
Answer : B
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