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Electrical Machines

Electrical Machines
A 3 - Φ, 4 pole, 50 Hz induction motor 4 % slip, calculate frequency of the rotor emf?

 50 Hz.
  3 Hz.
 10 Hz.
  2 Hz.

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

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

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Electrical Machines
Series field consists of--------number of turns and ---------- conductors respectively

 less and thick
 large and thin
 less and thin
 large and thick

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Electrical Machines
Why are capacitors used with large AC induction motor?

  Improve current level.
  Improve voltage level.
  Improve power factor.
  Improve power level.

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Electrical Machines
Direct-on-line (DOL) starters are not suitable for starting large DC motors, because

 the starting torque becomes low.
 the motor may run away.
 the motor may not start.
 the starting current will be enormously high.

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Electrical Machines
Which of the following motor is suitable for frequent starting and stoppings?

 Capacitor start motor
All of these
 Resistance split phase motor
 Capacitor start capacitor run motor

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