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MCQs

Dc Motors

Total Questions : 240 | Page 21 of 24 pages
Question 201. One D.C. motor drives another D.C. motor. The second D.C. motor when excited and driven
  1.    Also runs as a motor comes to stop after sometime
  2.    Runs as a generator
  3.    None of these
  4.    Does not run as a generator
 Discuss Question
Answer: Option B. -> Runs as a generator
Question 202. Which of the following motors is most suitable for signalling devices and many kinds of timers ?
  1.    Reluctance motor
  2.    C. shunt motor
  3.    Induction motor
  4.    C. series motor
 Discuss Question
Answer: Option A. -> Reluctance motor
Question 203. Where D.C. motor of H.P. 12 or more requires frequent starting, stopping, reversing and speed control
  1.    Four point starter is used
  2.    Drum type controller is used
  3.    All above can be used
  4.    Three point starter is used
 Discuss Question
Answer: Option B. -> Drum type controller is used
Question 204. Which of the following losses are significantly reduced by laminating the core of a D.C. generator?
  1.    Windage losses
  2.    Eddy current losses
  3.    Copper losses
  4.    Hysteresis losses
 Discuss Question
Answer: Option B. -> Eddy current losses
Question 205. In case the conditions for maximum power for a D.C. motor are established, the efficiency of the motor will be
  1.    1
  2.    Around 90%
  3.    Anywhere between 75% and 90%
  4.    Less than 50%
 Discuss Question
Answer: Option D. -> Less than 50%
Question 206. At the instant of starting when a D.C. motor is put on supply, it behaves like
  1.    A low resistance circuit
  2.    A capacitive circuit
  3.    A highly resistive circuit
  4.    None of these
 Discuss Question
Answer: Option A. -> A low resistance circuit
Question 207. Flywheel is used with D.C. compound motor to reduce the peak demand by the motor, compound motor will have to be
  1.    Level compounded
  2.    Under compounded
  3.    Cumulatively compounded
  4.    Differentially compounded
 Discuss Question
Answer: Option C. -> Cumulatively compounded
Question 208. Differentially compound D.C. motors can find applications requiring
  1.    Frequent on-off cycles
  2.    Low starting torque
  3.    High starting torque
  4.    Variable speed
 Discuss Question
Answer: Option B. -> Low starting torque
Question 209. If the supply voltage for a D.C. motor is increased, which of the following will decrease?
  1.    Operating speed
  2.    All of these
  3.    Full-load current
  4.    Starting torque
 Discuss Question
Answer: Option C. -> Full-load current
Question 210. The direction of rotation of a D.C. series motor can be changed by
  1.    Either of (A) and (B) above
  2.    Interchanging supply terminals
  3.    None of these
  4.    Interchanging field terminals
 Discuss Question
Answer: Option D. -> Interchanging field terminals

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