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MCQs

Dc Motors

Total Questions : 240 | Page 19 of 24 pages
Question 181. In a dc motor if the back emf is absent
  1.    Motor will run at very slow speed
  2.    Motor will not run at all
  3.    Motor will run at very high speed
  4.    Motor will burn
 Discuss Question
Answer: Option D. -> Motor will burn
Question 182. In the dc motor the iron losses occur in
  1.    Field
  2.    Commutator
  3.    Brushes
  4.    Armature
 Discuss Question
Answer: Option D. -> Armature
Question 183. The dirction of rotation of a dc series motor can be changed by
  1.    Either of Interchanging field or Interchanging supply
  2.    Interchanging field terminals
  3.    Interchanging supply terminals
  4.    None of the listed here
 Discuss Question
Answer: Option B. -> Interchanging field terminals
Question 184. The speed of a series motor at no load is
  1.    1000 rpm
  2.    Infinity
  3.    4000 rpm
  4.    2000 rpm
 Discuss Question
Answer: Option B. -> Infinity
Question 185. Which of the following application requires high starting torque?
  1.    Air blower
  2.    Lathe machine
  3.    Locomotive
  4.    Centrifugal pump
 Discuss Question
Answer: Option C. -> Locomotive
Question 186. If a dc motor is to be selected for conveyors, which motor would be preferred?
  1.    Differentially compound motor
  2.    Shunt motor
  3.    Series motor
  4.    Cummulative compound motor
 Discuss Question
Answer: Option C. -> Series motor
Question 187. In dc machines fractional pitch winding is used
  1.    To reduce the generated emf
  2.    To reduce the sparking
  3.    To improve cooling
  4.    To increase the generated emf
 Discuss Question
Answer: Option B. -> To reduce the sparking
Question 188. Which motor has the poorest speed control?
  1.    Cummulative compounded motor
  2.    Differentially compounded motor
  3.    Shunt motor
  4.    Series motor
 Discuss Question
Answer: Option D. -> Series motor
Question 189. For starting a dc motor a starter is required because
  1.    None of the listed here
  2.    It limits the starting current to a safe value
  3.    It limits the speed of the motor
  4.    It starts the motor
 Discuss Question
Answer: Option B. -> It limits the starting current to a safe value
Question 190. A dc series motor is that which
  1.    Has a poor torque
  2.    Has almost constant speed
  3.    Can be started easily without load
  4.    Has its field winding consisting of thick wire and less turns
 Discuss Question
Answer: Option D. -> Has its field winding consisting of thick wire and less turns

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