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Electrical Machines

Electrical Machines
Hopkinss test in DC motor is conducted at ?

 Low load.
 None of these.
  Full load.
 No load.

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Electrical Machines
In which of the following, voltage regulation may be zero or negative

 unity power factor
 leading power factor
All of these
 lagging power factor

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Electrical Machines
Which of the following are variable losses?

 armature copper loss
 hysteresis loss
 shunt field copper loss
 eddy current loss

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Electrical Machines
The induction motor shaft is made of

  stainless steel.
  mild steel.
  cast iron.
  aluminium.

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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

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

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Electrical Machines
What will be the eddy current loss if the supply frequency of a transformer becomes double?

 Eight times.
 Remains same.
 Four times.
 Doubled.

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