DC Motors MCQ Questions and Answers Quiz

111. Which of the following losses are significantly reduced by laminating the core of aD.C. generator ?

  1. Hysteresis losses
  2. Eddy current losses
  3. Copper losses
  4. Windage losses

112. Which of the following method of speed control of D.C. machine will offer minimum efficiency ?

  1. Voltage control method
  2. Field control method
  3. Armature control method
  4. All above methods

113. Which of the following motor has the poorest speed regulation ?

  1. Shunt motor
  2. Series motor
  3. Differential compound motor
  4. Cumulative compound motor

114. Which of the following motor is preferred for operation in highly explosive atmosphere ?

  1. Series motor
  2. Shunt motor
  3. Air motor
  4. Battery operated motor

115. Which of the following motors is most suitable for signalling devices and many kinds of timers ?

  1. D.C. shunt motor
  2. D.C. series motor
  3. Induction motor
  4. Reluctance motor

116. Which of the following motors is usually used in house-hold refrigerators ?

  1. D.C. shunt motor
  2. D.C. series motor
  3. Single phase induction motor (split phase start or induction run motor)
  4. Reluctance motor

117. Which of the following motors one will choose to drive the rotary compressor ?

  1. D.C. shunt motor
  2. D.C. series motor
  3. Universal motor
  4. Synchronous motor

118. Which of the following steps is likely to result in reduction of hysteresis loss in a D.C. generator ?

  1. Providing laminations in armature core
  2. Providing laminations in stator
  3. Using non-magnetic material for frame
  4. Using material of low hysteresis co-efficient for armature core material

119. Which of the following tests will be suitable for testing two similar D.C. series motorsof large capacity ?

  1. Swinburnes test
  2. Hopkinsons test
  3. Field test
  4. Brake test

120. Which one of the following is not necessarily the advantage of D.C. motors over A.C. motors ?

  1. Low cost
  2. Wide speed range
  3. Stability
  4. High starting torque.

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