Machine Design Questions MCQs


machine design Questions

Total Questions : 604

Page 1 of 31 pages
Question 1. The helix angle for single helical gears ranges from
  1.    10° to 15°
  2.    15° to 20°
  3.    20° to 35°
  4.    35° to 50°
Answer: Option C
Question 2. In thrust bearings, the load acts
  1.    Along the axis of rotation
  2.    Parallel to the axis of rotation
  3.    Perpendicular to the axis of rotation
  4.    In any direction
Answer: Option A
Question 3. The strap end of a connecting rod of steam engine is joined by
  1.    Gib of cotter joint
  2.    Sleeve and cotter joint
  3.    Spigot socket cotter joint
  4.    Knuckle joint
Answer: Option A
Question 4. For steel, the ultimate strength in shear as compared to ultimate strength in tension is
  1.    1/2
  2.    1/3
  3.    1/4
  4.    2/3
Answer: Option D
Question 5. Failure of a material is called fatigue when it fails
  1.    At the elastic limit
  2.    Below the elastic limit
  3.    At the yield point
  4.    Below the yield point
Answer: Option D
Question 6. The ends of the leaves of a semi-elliptical leaf spring are made triangular in order to
  1.    Obtain variable moment of inertia (I) in each leaf
  2.    Permit each leaf to act as an overhanging beam
  3.    Have variable bending moment (M) in each leaf
  4.    Make M/I constant throughout the length of the leaf
Answer: Option D
Question 7. The taper on a rectangular sunk key is
  1.    1 in 16
  2.    1 in 32
  3.    1 in 48
  4.    1 in 100
Answer: Option D
Question 8. The standard length of the shaft is
  1.    6 m
  2.    5 m
  3.    7 m
  4.    All of these
Answer: Option D
Question 9. A tapered key which fits in a key way in the hub and is flat on the shaft, is known as
  1.    Feather key
  2.    Gib-head key
  3.    Wood ruff key
  4.    Flat saddle key
Answer: Option D
Question 10. A tapered key which fits in a key-way in the hub and is flat on the shaft, is known as
  1.    Woodruff key
  2.    Feather key
  3.    Flat saddle key
  4.    Gib head key
Answer: Option C
Question 11. A taper key which fits half in the key way of the hub and half in the key way of shaft, is known as
  1.    Angular bevel gears
  2.    Mitre gears
  3.    Crown Bevel gears
  4.    Internal bevel gears
Answer: Option B
Question 12. The creep in the belt is due to
  1.    Effect of temperature on belt
  2.    Material of belt
  3.    Unequal extensions in the belt due to tight and slack side tensions
  4.    Stresses beyond elastic limit of belt material
Answer: Option C
Question 13. In radial cams, the follower moves
  1.    In a direction parallel to the cam axis
  2.    In a direction perpendicular to the cam axis
  3.    In any direction irrespective of cam axis
  4.    Along the cam axis
Answer: Option B
Question 14. Which of the following is not correct procedure to increase the fatigue limit?
  1.    Cold working
  2.    Shot peening
  3.    Surface decarburisation
  4.    Under stressing
Answer: Option C
Question 15. In cylindrical cams, the follower moves
  1.    In a direction perpendicular to the cam axis
  2.    In a direction parallel to the cam axis
  3.    In any direction irrespective of cam axis
  4.    Along the cam axis
Answer: Option B
Question 16. The bearings of heavy series have capacity __________ over the medium series.
  1.    20 to 30%
  2.    10 to 20%
  3.    30 to 40%
  4.    40 to 50%
Answer: Option A
Question 17. If the centre distance of the mating gears having involute teeth is increased, then the pressure angle
  1.    Increases
  2.    Decreases
  3.    Remains unchanged
  4.    None of these
Answer: Option A
Question 18. The steel pulleys are __________ in weight than cast iron pulleys of the same capacity.
  1.    Heavier
  2.    Lighter
  3.    Moderate
  4.    None of these
Answer: Option B
Question 19. The piston rod of a steam engine is usually connected to the cross-head by means of
  1.    Bolted joint
  2.    Knuckle joint
  3.    Cotter joint
  4.    Universal joint
Answer: Option C
Question 20. If the centre distance of the mating gears having involute teeth is varied within limits, the velocity ratio
  1.    Increases
  2.    Decreases
  3.    Remains unchanged
  4.    None of these
Answer: Option C