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Electrical Machines

Electrical Machines
As compared to an induction motor, the air gap in a DC motor is

 more.
 less than 50%.
 between 50% and 90%.
 same.

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Electrical Machines
Which of the following statements are correct ?

None of these
 A small value of leakage reactance will increase the maximum power output of motor.
 Both 1 and 2.
 The leakage reactance of the induction motor should be small.

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Electrical Machines
The starting resistance of DC motor is generally

 Infinitely large.
 1000 ohms.
 around 500 ohms.
  Low.

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Electrical Machines
An induction motor has synchronous speed of 1500 rpm. What will be the slip when it is running at a speed of 1450 rpm?

 -3%
 +3.33%
 +3%
 -3.33%

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Electrical Machines
An unexcited single phase synchronous motor is

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

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Electrical Machines
The principle of dynamically induced emf is utilized in

 thermocouple.
 choke.
 transformer.
 generator.

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