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MCQs

Total Questions : 86 | Page 7 of 9 pages
Question 61. For a motor-generator set which of the following motors will be preferred?
  1.    Synchronous motor
  2.    Slip ring induction motor
  3.    Pole changing induction motor
  4.    Squirrel cage induction motor
 Discuss Question
Answer: Option A. -> Synchronous motor
Question 62. Heat control switches are used in
  1.    Transformers
  2.    Cooling ranges
  3.    Three phase induction motors
  4.    Single phase
 Discuss Question
Answer: Option B. -> Cooling ranges
Question 63. In _________ method of staging three phase induction motors the starting voltage is not reduced.
  1.    Autotransformer
  2.    Star-delta
  3.    Slip ring
  4.    Any of the above
 Discuss Question
Answer: Option C. -> Slip ring
Question 64. Battery operated scooter for braking uses
  1.    Plugging
  2.    Mechanical braking
  3.    Regenerative braking
  4.    Rheostatic braking
 Discuss Question
Answer: Option B. -> Mechanical braking
Question 65. In squirrel cage induction motors which of the following methods of starting cannot be used?
  1.    Resistance in rotor circuit
  2.    Resistance in stator circuit
  3.    Autotransformer starting
  4.    Star-delta starting
 Discuss Question
Answer: Option A. -> Resistance in rotor circuit
Question 66. The cost of an induction motor will increase as
  1.    Horsepower rating increases but r.p.m. decreases
  2.    Horsepower rating decreases but r.p.m. increases
  3.    Horsepower rating and operating speed increases
  4.    Horsepower rating and operating speed decreases
 Discuss Question
Answer: Option A. -> Horsepower rating increases but r.p.m. decreases
Question 67. Which of the following alternatives will be cheaper?
  1.    A 100 H.P. AC. three phase motor
  2.    Four motors of 25 H.P. each
  3.    Five motors of 20 H.P. each
  4.    Ten motors of 10 H.P. each
 Discuss Question
Answer: Option A. -> A 100 H.P. AC. three phase motor
Question 68. For a particular application the type of electric and control gear are determined by which of the following considerations?
  1.    Starting torque
  2.    Conditions of environment
  3.    Limitation on starting current
  4.    All of the above
 Discuss Question
Answer: Option D. -> All of the above
Question 69. Which of the following motors always starts on load?
  1.    Conveyor motor
  2.    Floor mill motor
  3.    Fan motor
  4.    All of the above
 Discuss Question
Answer: Option D. -> All of the above
Question 70. The capacity of a crane is expressed in terms of
  1.    Type of drive
  2.    Span
  3.    Tonnes
  4.    Any of the above
 Discuss Question
Answer: Option C. -> Tonnes

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