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Electrical Machines

Electrical Machines
In an induction motor, air gap power is 10 Kw and mechanically developed power is 8 Kw. What are the rotor ohmic losses?

 1.5KW
 0.5Kw
 2KW
 3KW

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Electrical Machines
A 220 V DC machine has an armature resistance 1Ω. If the full load current is 20 A, the difference of induced voltage and generator is

  40 V.
 20 V.
 60 V.
 0 V.

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Electrical Machines
A 8 pole, 50 Hz single phase induction motor is running at 690 rpm. Its slip with respect to forward field is

 0.08
 -1.92
 1.92
 -0.08

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Electrical Machines
An unexcited single phase synchronous motor is

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

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Electrical Machines
In Ward-Leonard method of speed control, the direction of rotation of motor is reversed usually reversing the connection of the

 generator armature terminal.
 motor field terminal.
 generator field terminal.
 motor armature terminal.

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Electrical Machines
If an additional resistance is connected in series with a DC motor operating at rated speed, the speed of the motor will

  Oscillate around the normal speed.
  Reduce.
  Remain unaltered.
  Increase.

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