Flywheel MCQ

31. Which one of the following does not require a flywheel?

  1. Steam engine
  2. Engine-driven press
  3. CI engine
  4. Gas turbine
Answer
Answer. d

32. The torque crank angle diagram is used for the determination of ________ by the flywheel.

  1. amount of energy released
  2. amount of energy absorbed
  3. amount of torque produced
  4. amount of angle turned for the torque produced
Answer
Answer. b

33. One of the following is not pure rotation

  1. windmill
  2. the minutes hand of a clock
  3. bicycle wheel
  4. flywheel
Answer
Answer. c

34. The angular acceleration and the moment of inertia of the flywheel is 0.6 rad/s2 and 2500 kg-m2 respectively. What is the difference in kinetic energy (in kN-m) of the flywheel after 5 seconds and 10 seconds from start?

  1. 333.75
  2. 33.75
  3. 3375
  4. 33750
Answer
Answer. b

35. If a flywheel has mass moment of inertia I, rotating at a mean speed ω, kinetic energy is E and coefficient of fluctuation of speed is K, then maximum fluctuation of energy in a flywheel will be equal to

  1. Iω2K
  2. 2KE
  3. Iω(ω1 – ω2)
  4. all of the above
Answer
Answer. d

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

  1. Control valve
  2. Flywheel
  3. Governor
  4. Flywheel and Governor both
Answer
Answer. d

37. A flywheel fitted to a steam engine has a mass of 500 kg and radius of gyration 300 mm. The starting torque is 900 Nm. What is the kinetic energy after 10 s?

  1. 225 kJ
  2. 450 kJ
  3. 900 kJ
  4. 1800 kJ
Answer
Answer. c

38. The mass of flywheel of a steam engine is 3250 kg with the radius of gyration of 1 m. The starting torque of the engine is 4500 N-m, what is the angular acceleration (rad/s2) of the flywheel?

  1. 3.4
  2. 2
  3. 1.38
  4. 2.48
Answer
Answer. c

39. The turning moment diagram for a single cylinder double acting steam engine consists of +ve and-ve loops above and below the average torque line, For the +ve loop, the ratio of the speeds of the flywheel at the beginning and the end is which one of the following?

  1. Equal to unity
  2. Less than unity
  3. Zero
  4. Greater than unity
Answer
Answer. b

40. The angular acceleration and the moment of inertia of the flywheel is 0.6 rad/s2 and 2500 kgm2 respectively. What is the kinetic energy (in KN-m) of the flywheel after 10 seconds from the start?

  1. 45
  2. 450
  3. 4.5
  4. 4500
Answer
Answer. a
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