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Electrical Machines

Electrical Machines
Hopkinss test in DC motor is conducted at ?

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

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Electrical Machines
Centrifugal switch is absent in which of the single phase induction motor?

 Shaded pole motor.
None of these
  PSC (permanent split capacitor) motor.
 Split phase motor.

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Electrical Machines
Which of following components of a DC generator plays vital role for providing direct electric current of a DC generator?

 Dummy coils.
 Equalizer rings.
 Eye bolt.
 Commutator.

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Electrical Machines
If direct axis reactance Xd and quadrature axis reactance Xq are equal, then reluctance power is

 zero
 maximum
All of these
 minimum

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Electrical Machines
Field weakening method is also called as-----------?

 constant power control
 constant voltage control
 constant current control
 constant torque control

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Electrical Machines
In DC machine yoke offers

 mechanical protection to the machine
 both A and B
 produce working flux
 flux path completion

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