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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
 0 Hz
 1 Hz
 50 Hz

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Electrical Machines
If a transformer has turns ratio K, the primary and secondary current are I1 and I2 respectively and magnetizing current and core loss component of no load current Iμ and Iw respectively, then

  I1 = KI2 + Iw + Iμ.ok
 I1 = KI2.
 I1 = KI2 + Iμ.
 I1 = KI2 + Iw.

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Electrical Machines
Ward-Leonard control is basically a ___________ control method.

 Armature voltage control.
 Field control.
 Field diverter control.
 Armature resistance control.

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Electrical Machines
The three point starter is used for

  Shunt motor.
  Shunt, compound and series motor.
  Series motor.
  Shunt motor as well as compound motors.

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

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

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Electrical Machines
Generator works on the principle of production

 both A and B.
 static induced emf.
None of these
 dynamically induced emf.

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