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Electrical Machines

Electrical Machines
A 4 pole 50 Hz induction motor is running at 1470 rpm. The frequency of rotor current is

 5 Hz
 1 Hz
 0 Hz
 50 Hz

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Electrical Machines
Which of the following motors are suitable for computer printer drive ?

 Reluctance motor.
 Shaded pole motor.
 Hysteresis motor.
  Stepper motor.

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Electrical Machines
Reversing the direction of rotation of split phase motors is done by

 reversing the terminals of main winding.
 reversing the terminals of starting winding.
All of these
 interchanging the capacitor from starting winding to main winding or vice versa.

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Electrical Machines
3rd harmonics are eliminated in induction motor by using

  delta connection.
  zig - zag connection.
  star connection.
  V connection.

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Electrical Machines
Eddy current loss will depends on

 Frequency
All of these
 Thickness
 Flux density

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Electrical Machines
With the increases in field excitation of a DC generator, its generated emf

  increases upto a limit and then remains almost constant.
  remains constant.
 increases.
  decreases.

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