Belt Drive MCQ and Pulley MCQ

51. A pulley is driven by a flat belt and the maximum tension produced in the belt is of 1400N. The belt has the density of 1000 kg/m3, 100 mm wide and5 mm thick. What is the speed (m/sec) of the belt for the maximum power?

  1. 31
  2. 32
  3. 3.05
  4. 30.55
Answer
Answer. d

52. In a flat belt drive, slip between the driver and belt is 1% and that between belt and follower is 3%. If the pulley diameters are same, the velocity ratio of the drive is

  1. 0.96
  2. 0.97
  3. 0.98
  4. 0.99
Answer
Answer. a

53. The power transmission takes place from a pulley of diameter 1 m running at the speed of 250 rpm to a pulley of 2.50 m diameter by means of a belt. Determine the speed (in rpm) of the driven pulley?

  1. 110
  2. 150
  3. 100
  4. 625
Answer
Answer. c

54. The pulley, which is used to increase the angle of contact, is called a/an _________ pulley.

  1. fast
  2. cross belt
  3. loose
  4. idler
Answer
Answer. d

55. Average tensions on the tight side and slack side of a flat belt drive are 700 N and 400 N respectively. If linear velocity of the belt is 5 m/s, the power transmitted will be

  1. 2.5 kW
  2. 1.5 kW
  3. 3.0 kW
  4. 2.8 kW
Answer
Answer. b

56. Crowning of a pulley is done to

  1. avoid slipping of the belt
  2. increase strength of the pulley
  3. enable pulley rigidity fixed to the shaft
  4. prevent the wear and fear of the belt
Answer
Answer. a

57. The power transmission takes place in shaft rotating at 400 rpm and this rotating shaft drives another shaft at 600 rpm. The smaller pulley has the diameter of 0.5 m. The centre distance between pulleys is 4m. If the angle of contact on the smaller pulley for the open belt drive is 1.8° then calculate the diameter of larger pulley (in m) and angle of contact (in rad)?

  1. 0.50 and 2.00
  2. 0.75 and 2.00
  3. 0.50 and 3.08
  4. 0.75 and 3.08
Answer
Answer. d

58. The difference between tensions on the tight and slack sides of a belt drive is 3000 N. If the belt speed is 15m/sec, the transmitted power in

  1. 90
  2. 22.5
  3. 100
  4. 45
Answer
Answer. d

59. Which of the following is the CORRECT reason for the creep in a belt drive?

  1. Elongation of belt due to tension
  2. Plasticity of belt material
  3. Elongation of belt material
  4. Differential elongation of belt due to difference in tension on two sides of pulley
Answer
Answer. d

60. A shaft is driven with the help of a belt which is passing over the engine and shaft. The engine is running at 200 r.p.m. The diameter of engine pulley is 51 cm and that of shaft is 30 cm. The speed of the shaft will be

  1. 300 r.p.m.
  2. 200 r.p.m.
  3. 340 r.p.m.
  4. 400 r.p.m.
Answer
Answer. c
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