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Electrical Machines

Electrical Machines
In a transformer which of the following losses are zero?

 Iron loss
All of these
 Rotational loss
 Copper loss

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Electrical Machines
A DC generator without commutator is a

 DC generator
 AC generator
 DC motor
 induction motor

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Electrical Machines
Wave winding is prefered for which of the following rating?

 high current and low voltage
 low current and high voltage
 high current and high voltage
 low current and low voltage

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Electrical Machines
For a fault at the terminal of a synchronous generator, the fault current is maximum for a

 line to line fault.
 3 - phase fault.
  line to ground fault.
 3 - phase to ground fault.

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Electrical Machines
An unexcited single phase synchronous motor is

  universal motor.
 repulsion motor.
 reluctance motor.
 AC series motor.

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Electrical Machines
If the no-voltage release in a DC motor starter fails to operate on failure of supply, on resumption of supply the motor will

 start automatically without trouble.
 not start automatically.
 get damaged.
 develop very low starting torque.

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