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Electrical Machines

Electrical Machines
In salient pole synchronous machine, the reluctance power varies as

 sin2δ
 cos2δ
 cosδ
 sinδ

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Electrical Machines
The direction of rotation of a 3 - Φ induction motor is clockwise when it is supplied with 3 - Φ sinusoidal voltage having phase sequence A - B - C. For counterclockwise rotation of motor, the phase sequence of the supply should be

 B - C - A or C - A - B.
  A - C - B.
 C - A - B.
 B - C - A.

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Electrical Machines
In an auto-transformer, power is transferred through

None of these
 conduction process only.
 induction process only.
 both A and B.

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Electrical Machines
Which of the following motor used in hair dryers?

  Split phase IM.
  Cage induction motor.
  Synchronous motors.
  Shaded pole IM.

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Electrical Machines
Armature resistance control method is used for the _______ ?

 both 1 and 2
None of these
 above rated speed
 below rated speed

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Electrical Machines
In a synchronous machine, if φ is the flux per pole and f is the frequency of the emf induced E then

 E ∝ 1/(φf)
 E ∝ f/φ
 E ∝ φ/f
 E ∝ φf

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