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Electrical Machines

Electrical Machines
At stand still condition the value of slip is

 1
 finite value
 infinite value
 0

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Electrical Machines
The shaft torque of a dc motor is less than the electromagnetic torque because of

  hysteresis losses.
  eddy current losses.
  ohmic losses.
  mechanical losses.

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Electrical Machines
For very sensitive and wide speed control, the preferable control method is

 Armature control.
 Ward-Leonard control.
 Field control.
 Multiple voltage control.

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Electrical Machines
Consider the following statements : For a level compounded dc generator to run at constant voltage, the series field mmf must effectively compensate 1. armature reaction mmf 2.armature resistance drop 3. brush contact voltage drop Which of these statements is/are correct ?

 1 and 3
 1, 2 and 3
 2 alone
 1 and 2

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Electrical Machines
Commonly used starters of cage motor is

  DOL.
  star delta.
None of these
  both A and B.

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Electrical Machines
The type of DC motor generally used for shears and punches is

 Series motor.
 Cummulative compound motor.
 Differential compound motor.
 Shunt motor.

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MORE MCQ ON Electrical Machines

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