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Electrical Machines

Electrical Machines
The current drawn by a DC motor at the time of starting is

 Normal.
 Zero.
 Very high.
 Very low.

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Electrical Machines
What is the frequency of rotor current of 50 Hz induction motor operating at 4% slip?

 50Hz
 1 Hz
 2.5Hz
 2HZ

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Electrical Machines
A large series motor is never started without some mechanical load on it because otherwise it will

 draw too much current.
 develop excessive speed and damage itself.
 open fuse or circuit breaker.
 produce sparking at brushes.

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Electrical Machines
Eb/Vt ratio of a DC motor is an indication of

 starting torque.
 speed regulation.
 running torque.
 efficiency.

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Electrical Machines
Direction of rotation of DC motor is reversed by

 Adding resistance to field circuit.
 Reversing armature connection or field connection.
 Interchanging armature and field connection.
 Reversing supply connection.

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Electrical Machines
Field weakening control method is used for the _________ ?

 both A and B
 below rated speed
None of these
 above rated speed

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MORE MCQ ON Electrical Machines

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