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Electrical Machines

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

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

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Electrical Machines
When two DC series motors are connected in parallel, the resultant speed is

 less than normal speed.
 normal speed.
 more than normal speed.
 zero.

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Electrical Machines
When flux density is constant in a transformer, hysteresis loss varies as

 f²
 f
 V
 V²

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

 starting torque.
 running torque.
 speed regulation.
 efficiency.

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Electrical Machines
If B is flux density, l the length of the conductor and v the velocity of the conductor, then emf is given by

 Blv.
 Bl2v2.
 Bl2v.
 Blv2.

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Electrical Machines
Synchronous condensers are used to

All of these
 reduce hunting
 improve starting torque
 improve the power factor

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