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Electrical Machines

Electrical Machines
Flux density under trailing pole tips in case of generator will

 increase
 decrease
 either increase or decrease
None of these

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Electrical Machines
If the back emf in DC motor vanishes suddenly the motor will

 burn.
 start haunting.
 run at very high speed.
 run at very low speed.

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Electrical Machines
A single-winding single-phase motor has

 low starting torque.
 high starting torque.
  zero starting torque.
 starting torque equal to full-load torque.

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Electrical Machines
A 220 V DC machine has an armature resistance 1Ω. If the full load current is 20 A, the difference of induced voltage and generator is

 60 V.
 0 V.
 20 V.
  40 V.

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Electrical Machines
For standing a DC motor a starter is required because

  it limits the speed of the motor.
  It starts the motor.
None of these
  it limits the starting current to a safe value.

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Electrical Machines
Which of the following is/are effects of armature reaction?

 increase the iron loss
 increase the maintenance and repair
All of these
 increases the design cost

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MORE MCQ ON Electrical Machines

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