Flywheel MCQ

51. A shaft of diameter 50 mm, length 900 mm and torsional stiffness 87 Nm/rad, carries two flywheels of mass moments of inertia 10 kgm² and 30 kgm² respectively. The distance of the node from smaller flywheel end is

1. 425 mm
2. 300 mm
3. 675 mm
4. 550 mm

52. A flywheel is connected to a punching machine. If supplied 400 Nm torque at 20 rad/s mean speed. If total fluctuation of speed not more than ±2% then mass moment inertia of flywheel will be?

1. 50 kg-m²
2. 25 kg-m²
3. 125 kg-m²
4. 100 kg-m²

53. A flywheel absorbs 24 kJ of energy while increasing its speed from 210 rps to 214 rps. What will be its kinetic energy at 220 rps?

1. 825.1 kJ
2. 790.4 kJ
3. 936.4 kJ
4. 684.9 kJ

54. A flywheel of a steam engine has a mass 2000 kg and a radius of gyration of 2 m. Its mass moment of inertia will be ______________ kgm².

1. 600
2. 8000
3. 16000
4. 24000

55. If the speed of the flywheel is to be maintained within ±1% of the mean speed, then the coefficient of the fluctuation of speed is

1. 0.01
2. 0.02
3. 0.03
4. 0.04