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Electrical Machines

Electrical Machines
A 4 pole 50 Hz induction motor is running at 1470 rpm. What is the slip value?

 0.02
 0.2
 0.04
 0.4

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Electrical Machines
Flux density under leading pole tips in case of generator will

 either increase or decrease
 increase
None of these
 decrease

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Electrical Machines
An unexcited single phase synchronous motor is

 AC series motor.
 repulsion motor.
 reluctance motor.
  universal motor.

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Electrical Machines
In a DC motor under constant terminal voltage what is the relation between torque (Te) and power (P)

 T∝ P
 T∝ P²
 T is independent of P
 T∝ P³

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Electrical Machines
Demagnetization effects which of the following?

 reduces the terminal voltage
 reduction in main field flux
 commutation
 both B and C

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Electrical Machines
In a transformer the magnetic coupling between the primary and secondary winding can be increased by

 using transformer oil of better quality.
 using the magnetic core of low reluctance.
 using soft material for winding.
 increasing the number of turns.

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