1.Flywheels are used in punching and shear operation?
a) True
b) False
2. Which of the following are functions of flywheel?
a) Store and release energy during work cycle
b) Reduce power capacity of the electric motor
c) Reduce amplitude of speed fluctuations
d) All of the listed
3. When comes down to stress reduction, which one is preferred?
a) Solid flywheel
b) Split flywheel
c) Both have equal stresses
d) Cannot be determined
4. The operation of flywheel is continuous?
a) True
b) False
5. Is use of a flywheel recommended when a large motor is required only for a small instant
of time?
a) True
b) False
6. Clamp coupling employ bolts?
a) True
b) False
7. Entire torque is transmitted by friction in the clamp coupling?
a) True
b) False
8. Does shaft has to be shifted i axial direction to remove clamp coupling?
a) Yes
b) No
9. Power is transmitted by only in rigid flange coupling?
a) True
b) False
10. If shaft diameter is 60mm, how many bolts are recommended for rigid flange coupling?
a) 2
b) 3
c) 4
d) 5
Belt Drive
11. Belt, chain and rope are called rigid drives.
a) True
b) Belt is a flexible drive only
c) All three are flexible drives
d) None of the listed
Answer: b
12. In flexible drives, rotary motion of driving shaft is directly converted to rotary motion of
driven shafts
a) Yes
b) No, translator motion is involved
c) No, Cylindrical motion is involved
d) No, Parabolic motion is involved\
Answer: b
13. Velocity ratio in both flexible and rigid drive is constant.
a) True
b) False
Answer: b
14. Is there any worry for overloading conditions in flexible belt drives?
a) Yes
b) No
c) Only after a particular threshold limit
d) Depends on external factors
Answer: b
15. V belts have v shaped cross section.
a) No, rectangular
b) No, trapezium
c) No, circular
d) No, spherical
Answer: b
16. The force of friction between belt and V grooved pulley is high.
a) Yes, supported by wedge action
b) No
c) There is no wedge action involved
d) None of the listed
Answer: a
17. V belts result in smooth and quite operation even at high speeds.
a) Yes
b) No they are very noisy
c) They are not endless and hence not smooth motion
d) None of the listed
Answer: a
18. There is problem of bending stress in the V belt drive.
a) True
b) False
Answer: a
Chain Drive
19. A chain drive consist of an endless chain wrapped around two sprockets.
a) True
b) False
Answer: a
20. The chain drive is same as gear drive.
a) Yes
b) No, it is intermediate between belt and gear drive
c) It is superior to gear drive
d) It is inferior to gear drive
Answer: b
21. Gear drives are preferred over chain drives for long centre distances.
a) Yes
b) No, they require additional idle gears.
c) No idler gears are required
d) None of the listed
Answer: b
22. Belt drives have compact construction as compared to chain drives.
a) Yes
b) No, chain drives have compact construction
c) Both have same construction
d) Can’t be cited
Answer: b
23. Chain drives suffer from wear problems.
a) Yes, chain might leave the sprocket
b) No, there is no wear problem
c) Wear is insignificant in chain drives
d) None of the listed
Answer: a
24. For non-parallel shafts, chain drives are highly recommended.
a) True
b) Gear drive is preferred
c) Depends on the transmission ratio
d) Can’t be stated
Answer: b
25. The velocity of the chain is always constant in case of chain drive.
a) Yes
b) No, it can never be constant
c) It is constant above a particular value
d) Can’t be stated
Answer: b
26. Chain drives require little or no maintenance and creates no noise.
a) True
b) False
Answer: b
27. In roller chains, there is sliding friction between roller and sprocket teeth.
a) True
b) False
Answer: b
Bearing
28. A radial bearing supports the load that acts along the axis of the shaft.
a) True
b) False
Answer: b
29. A_______ bearing supports the load acting along the axis of the shaft.
a) Thrust
b) Radial
c) Longitudinal
d) Transversal
Answer: a
30. Sliding contact bearings, also called plain bearings have no problem of wear.
a) True
b) False
Answer: b
31. In steam and gas turbines, rolling contact bearings are used.
a) True
b) False
Answer: b
32. Viscosity is defined as the external resistance offered by a fluid to change its
shape or relative motion of its parts.
a) Yes
b) It is internal resisting force
c) It is not offered but exerted on the fluids
d) None of the listed
Answer: b
33. Viscosity of lubricating oil decrease with increasing temperature.
a) Yes
b) It increases linearly
c) It increases hyperbolically
d) it remains constant
Answer: a
34. In hydrodynamic lubrication, film thickness remains unaffected by change in
speeds.
a) True
b) Increase with increase in speed
c) Decrease with increase in speed
d) Disappear as the speed tends to infinity
Answer: b
Gear
35. The common normal to the curves of the two teeth must not pass through the
pitch point.
a) True
b) It must pass
c) It may or may not pass
d) None of the listed
Answer: b
36. Which of the following can be used for power transmission in intersecting
shafts.
a) Spur Gear
b) Helical Gear
c) Bevel Gear
d) None of the listed
Answer: c
37. Which of the following is not true about gears?
a) Positive drive
b) Constant velocity ratio
c) Transmit large power
d) Bulky construction
Answer: d
38. Gear drive don’t require precise alignment of shafts.
a) True
b) False
Answer: b
39. The teeth of the helical gears are cut parallel to the shaft axis.
a) True
b) False
Answer: b
40. Herringbone gear can be used in
a) Intersecting shafts only
b) Parallel shafts only
c) Both intersection and parallel shafts
d) None of the mentioned
Answer: b
41. Bevel gears impose ____ loads on the shafts.
a) Radial and thrust
b) Radial
c) Thrust
d) Neither radial nor thrust
Answer: a
42. Which of the following are true for worm gears?
a) Worm is in the shape of threaded screw
b) Threads on the worm have small lead
c) Worm imposes high thrust loads
d) Characterised by low speed reduction ratio
Answer: d
Terminology of spur gears
43. Required velocity ratio is 60:1, which of the following are recommended?
a) Worm
b) Spur
c) Bevel
d) None of the mentioned
Answer: a
44. Pressure angle remains constant in case of involute profile.
a) True
b) False
Answer: a
45. Pressure angle is _____ in case of cycloidal teeth.
a) Constant
b) Variable
c) zero
d) None of the listed
Answer: b
46. 4. If no re boring allowance is to be given, then thickness of cylinder wall
is max pressure is 3.5N/mm², bore diameter=200mm and permissible tensile
stress is 40N/mm².
a) 7mm
b) 8mm
c) 9mm
d) 10mm
Answer: c
47. If diameter of cylinder of bore is 120mm, then thickness of the cylinder will
be
a) Information not sufficient
b) 7mm
c) 12mm
d) 6mm
Answer: b
48. The circumferential hoop stress and longitudinal stress are both shear
stress.
a) True
b) False
Answer: b
49. The circumferential hoop stress and longitudinal stress act in same
direction and hence are straight away added.
a) True
b) False
Answer: b
