Flywheel MCQ

41. If a flywheel having mass of 100 kg and radius of gyration 10 cm is rotating at 10 rad/s, its rotational kinetic energy will be

1. 10J
2. 25 J
3. 50 J
4. 100 J

42. Which of the following is NOT a function of flywheel?

1. Store and release energy during work cycle.
2. Reduce power capacity of the electric motor
3. Reduce amplitude of speed fluctuations
4. Reduce engine speed

43. The flywheel of a steam engine has a radius of gyration of 1 m and mass 2500 kg. The starting torque of the steam engine is 1500 N-m. Determine angular acceleration of the flywheel.

1. 0.8 rad/s
2. 0.6 rad/s
3. 0.9 rad/s
4. 1.6 rad/s

44. Which of the following is used for controlling energy fluctuations in an engine?

1. Control valve
2. Fuel injector
3. Flywheel
4. Governor

45. A flywheel of 1500 mm diameter is fit to the crankshaft of an engine, which rotates at 300 rpm. What will be its angular velocity?

1. 31.02 rad/sec
2. 31.42 rad/sec
3. 32.02 rad/sec
4. 32.42 rad/sec

46. A circular solid disc of uniform thickness of 20 mm, radius 200 mm and mass 20 kg, is used as a flywheel. If it rotates at 600 rpm, then the kinetic energy (in joules) of the flywheel is

1. 400
2. 790
3. 1600
4. 300

47. The speed of an engine varies from 210 rad/s to 190 rad/s. During cycle the change in kinetic energy is found to be 400 Nm. The inertia (I) of the flywheel in kgm² is

1. 0.40
2. 0.10
3. 0.20
4. 0.30

48. An engine, as the prime mover must have both flywheel and a governor provided in the system for which of the following purposes?

1. For increasing the speed
2. For minimizing the speed fluctuations
3. For maximizing the speed fluctuations
4. None of these

49. A circular solid disc of uniform thickness with radius 200 mm and mass 20 kg is used as flywheel. It is rotates at 600 rpm the kinetic energy of the flywheel in Joule is

1. 395
2. 790
3. 1580
4. 3160

50. Which of the following is used to store energy and give up whenever required?

1. Clutch
2. Gear
3. Governor
4. Flywheel