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More Questions on This Topic :

Question 1. Which D.C. motor is preferred for elevators?
  1.    Shunt motor
  2.    Series motor
  3.    Differential compound motor
  4.    Cumulative compound motor
Answer: Option D

Question 2. During rheostatic braking of D.C. series motors
  1.    Motor is run as a generator
  2.    Motor is reversed in direction
  3.    Motor is run at reduced speed
  4.    None of these
Answer: Option A

Question 3. In a D.C. generator all of the following could be the effects of iron losses except
  1.    Loss of efficiency
  2.    Excessive heating of core
  3.    Increase in terminal voltage
  4.    Rise in temperature of ventilating air
Answer: Option C

Question 4. In case the back e.m.f. and the speed of a D.C. motor are doubled, the torque developed by the motor will
  1.    Remain unchanged
  2.    Reduce to one-fourth value
  3.    Increase four folds
  4.    Be doubled
Answer: Option A

Question 5. 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
Answer: Option D

Question 6. When two D.C. series motors are connected in parallel, the resultant speed is
  1.    More than the normal speed
  2.    Loss than the normal speed
  3.    Normal speed
  4.    Zero
Answer: Option A