Flywheel MCQ

21. If the size of the flywheel in a punching machine is increased, then

  1. fluctuation of speed as well as fluctuation of energy will decrease
  2. fluctuation of speed will decrease but the fluctuation of energy will increase
  3. fluctuation of speed will increase and the fluctuation of energy will decrease
  4. fluctuation of speed as well as fluctuation of energy will increase
Answer
Answer. b

22. In a flywheel the value of safe stress is 25 MN/m2 and density of material is 10000 kg/m3. The maximum peripheral velocity will be

  1. 50
  2. 25
  3. 100
  4. 200
Answer
Answer. a

23. In a turning moment diagram, the variations of energy above and below the mean resisting torque line is called

  1. fluctuation of energy
  2. maximum fluctuation of energy
  3. coefficient of fluctuation of energy
  4. none of these
Answer
Answer. a

24. The primary function of the flywheel is

  1. to limit the fluctuations of speed during each
  2. to absorb energy during these periods of crank rotation when turning moment is less than the resisting points
  3. to maintain the constant speed of rotation of the crankshaft when the load on the engine increases
  4. to maintain constant speed of rotation of the crank shaft when the load on the engine decreases
Answer
Answer. a

25. A flywheel in an I.C. engine

  1. controls the supply of fuel to the engine
  2. controls the cyclic fluctuation of speed
  3. controls the speed variation due to load
  4. all the above
Answer
Answer. b

26. The function of a flywheel is to

  1. facilitate start of machine
  2. smooth out power impulses
  3. act as pulley for belt drive
  4. to store energy for periods of failure of main supply
Answer
Answer. b

27. Which of the following is a correct statement?

  1. A flywheel regulates speed during one cycle while the governor regulates speed from cycle to cycle.
  2. The flywheel is an essential element of every prime mover.
  3. A flywheel controls the quantity or quality of the working agent.
  4. A governor regulates speed by storing kinetic energy
Answer
Answer. a

28. The moment of inertia of a flywheel is 19.6 kgm2 and it fluctuates at the speed of 40 rpm for the fluctuation in energy of 2036 joule. What is the mean speed of the flywheel (rad/s)?

  1. 24.79
  2. 25
  3. 30
  4. 27
Answer
Answer. a

29. A flywheel on a motor speeds up from rest to 1000 r.p.m. in 6 seconds. The number of revolutions made thereby is nearly

  1. 200
  2. 100
  3. 50
  4. 20
Answer
Answer. c

30. A solid disc type flywheel has the diameter D, what is the radius of gyration of the solid disc type?

  1. D
  2. D/2
  3. $\frac{D}{2\sqrt{2}}$
  4. 2/D
Answer
Answer. c
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