61. Which of the following motors has series characteristics ?
(a) Shaded pole motor
(b) Repulsion motor
(c) Capacitor start motor
(d) None of the above
Ans: b
62. Which of the following happens when star-delta starter is used ?
(a) Starting voltage is reduced
(b) Starting current is reduced
(c) Both (a) and (b)
(d) None of the above
Ans: c
63. For a D.C. shunt motor which of the following is incorrect 7
(a) Unsuitable for heavy duty starting
(b) Torque varies as armature current
(c) Torque-armature current is a straight line
(d) Torque is zero for zero armature current
Ans: a
64. For which of the following applications motor has to start with high acceleration?
(a) Oil expeller
(b) Floor mill
(c) Lifts and hoists
(d) Centrifugal pump
Ans: c
65. Which of the following types of motor enclosure is safest ?
(a) Totally enclosed
(b) Totally enclosed fan cooled
(c) Open type
(d) Semi closed
Ans: b
66. While selecting motor for an air conditioner which of the following characteristics is of great importance ?
(a) Type of bearings
(b) Type of enclosure
(c) Noise
(d) Arrangement for power transmis¬sion
(e) None of the above
Ans: c
67. The diameter of the rotor shaft for an electric motor depends on which of the following ?
(a) r.p.m. only
(b) Horse power only
(c) Horse power and r.p.m.
(d) Horse power, r.p.m. and power factor
Ans: c
68. Which of the following alternatives will be cheaper ?
(a) A 100 H.P. AC. three phase motor
(b) Four motors of 25 H.P. each
(c) Five motors of 20 H.P. each
(d) Ten motors of 10 H.P. each
Ans: a
69. The cost of an induction motor will increase as
(a) horsepower rating increases but r.p.m. decreases
(b) horsepower rating decreases but r.p.m. increases
(c) horsepower rating and operating speed increases
(d) horsepower rating and operating speed decreases
Ans: a
70. In series motor which of the following methods can be used for changing the flux per pole ?
(a) Tapped field control
(b) Diverter field control
(c) Series-parallel control
(d) Any of the above
Ans: d
Read More Questions:
Industrial Drives MCQs Part1
Industrial Drives MCQs Part2
(a) Shaded pole motor
(b) Repulsion motor
(c) Capacitor start motor
(d) None of the above
Ans: b
62. Which of the following happens when star-delta starter is used ?
(a) Starting voltage is reduced
(b) Starting current is reduced
(c) Both (a) and (b)
(d) None of the above
Ans: c
63. For a D.C. shunt motor which of the following is incorrect 7
(a) Unsuitable for heavy duty starting
(b) Torque varies as armature current
(c) Torque-armature current is a straight line
(d) Torque is zero for zero armature current
Ans: a
64. For which of the following applications motor has to start with high acceleration?
(a) Oil expeller
(b) Floor mill
(c) Lifts and hoists
(d) Centrifugal pump
Ans: c
65. Which of the following types of motor enclosure is safest ?
(a) Totally enclosed
(b) Totally enclosed fan cooled
(c) Open type
(d) Semi closed
Ans: b
66. While selecting motor for an air conditioner which of the following characteristics is of great importance ?
(a) Type of bearings
(b) Type of enclosure
(c) Noise
(d) Arrangement for power transmis¬sion
(e) None of the above
Ans: c
67. The diameter of the rotor shaft for an electric motor depends on which of the following ?
(a) r.p.m. only
(b) Horse power only
(c) Horse power and r.p.m.
(d) Horse power, r.p.m. and power factor
Ans: c
68. Which of the following alternatives will be cheaper ?
(a) A 100 H.P. AC. three phase motor
(b) Four motors of 25 H.P. each
(c) Five motors of 20 H.P. each
(d) Ten motors of 10 H.P. each
Ans: a
69. The cost of an induction motor will increase as
(a) horsepower rating increases but r.p.m. decreases
(b) horsepower rating decreases but r.p.m. increases
(c) horsepower rating and operating speed increases
(d) horsepower rating and operating speed decreases
Ans: a
70. In series motor which of the following methods can be used for changing the flux per pole ?
(a) Tapped field control
(b) Diverter field control
(c) Series-parallel control
(d) Any of the above
Ans: d
Read More Questions:
Industrial Drives MCQs Part1
Industrial Drives MCQs Part2
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