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MCQs

Dc Motors

Total Questions : 240 | Page 9 of 24 pages
Question 81. Which motor has the poorest speed control?
  1.    Differentially compounded motor
  2.    Cumulatively compounded motor
  3.    Shunt motor
  4.    Series motor
 Discuss Question
Answer: Option D. -> Series motor
Question 82. The direction of rotation of a D.C. series motor can be changed by
  1.    Interchanging supply terminals
  2.    Interchanging field terminals
  3.    Either of (A) and (B) above
  4.    None of the above
 Discuss Question
Answer: Option B. -> Interchanging field terminals
Question 83. 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 84. If the supply voltage for a D.C. motor is increased, which of the following will decrease?
  1.    Starting torque
  2.    Operating speed
  3.    Full-load current
  4.    All of the above
 Discuss Question
Answer: Option C. -> Full-load current
Question 85. Differentially compound D.C. motors can find applications requiring
  1.    High starting torque
  2.    Low starting torque
  3.    Variable speed
  4.    Frequent on-off cycles
 Discuss Question
Answer: Option B. -> Low starting torque
Question 86. At the instant of starting when a D.C. motor is put on supply, it behaves like
  1.    A highly resistive circuit
  2.    A low resistance circuit
  3.    A capacitive circuit
  4.    None of the above
 Discuss Question
Answer: Option B. -> A low resistance circuit
Question 87. For the same H.P. rating and full load speed, following motor has poor starting torque
  1.    Shunt
  2.    Series
  3.    Differentially compounded
  4.    Cumulatively compounded
 Discuss Question
Answer: Option C. -> Differentially compounded
Question 88. Which D.C. motor is generally preferred for cranes and hoists?
  1.    Series motor
  2.    Shunt motor
  3.    Cumulatively compounded motor
  4.    Differentially compounded motor
 Discuss Question
Answer: Option A. -> Series motor
Question 89. The armature torque of the D.C. shunt motor is proportional to
  1.    field flux only
  2.    armature current only
  3.    both (A) and (B)
  4.    none of the above
 Discuss Question
Answer: Option B. -> armature current only
Question 90. What will happen if the back e.m.f. of a D.C. motor vanishes suddenly?
  1.    The motor will stop
  2.    The motor will continue to run
  3.    The armature may burn
  4.    The motor will run noisy
 Discuss Question
Answer: Option C. -> The armature may burn

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