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MCQs

Total Questions : 86 | Page 3 of 9 pages
Question 21. The starting torque of a D.C. motor is independent of which of the following?
  1.    Flux
  2.    Armature current
  3.    Flux and armature current
  4.    Speed
 Discuss Question
Answer: Option D. -> Speed
Question 22. Light duty cranes are used in which of the following?
  1.    Power houses
  2.    Pumping stations
  3.    Automobile workshops
  4.    All of the above
 Discuss Question
Answer: Option D. -> All of the above
Question 23. The diameter of the rotor shaft for an electric motor depends on which of the following?
  1.    r.p.m. only
  2.    Horse power only
  3.    Horse power and r.p.m.
  4.    Horse power, r.p.m. and power factor
 Discuss Question
Answer: Option C. -> Horse power and r.p.m.
Question 24. In case of __________ speed control by injecting e.m.f. in the rotor circuit is possible,
  1.    D.C. shunt motor
  2.    Schrage motor
  3.    Synchronous motor
  4.    Slip ring induction motor
 Discuss Question
Answer: Option D. -> Slip ring induction motor
Question 25. Which of the following motors is preferred when smooth and precise speed control over a wide range is desired?
  1.    D.C. motor
  2.    Squirrel cage induction motor
  3.    Wound rotor induction motor
  4.    Synchronous motor
 Discuss Question
Answer: Option A. -> D.C. motor
Question 26. The selection of an electric motor for any application depends on which of the following factors?
  1.    Electrical characteristics
  2.    Mechanical characteristics
  3.    Size and rating of motors
  4.    All of the above
 Discuss Question
Answer: Option D. -> All of the above
Question 27. By the use of which of the following D.C. can be obtained from AC.?
  1.    Silicon diodes
  2.    Mercury arc rectifier
  3.    Motor generator set
  4.    Any of the above
 Discuss Question
Answer: Option D. -> Any of the above
Question 28. Which of the following is essentially needed while selecting a motor?
  1.    Pulley
  2.    Starter
  3.    Foundation pedal
  4.    Bearings
 Discuss Question
Answer: Option B. -> Starter
Question 29. Short time rated motors are preferred for overhead traveling cranes
  1.    True
  2.    False
 Discuss Question
Answer: Option A. -> True
Question 30. Reluctance motor is a
  1.    Variable torque motor
  2.    Low torque variable speed motor
  3.    Self starting type synchronous motor
  4.    Low noise, slow speed motor
 Discuss Question
Answer: Option C. -> Self starting type synchronous motor

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