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Electrical Machines

Electrical Machines
For the purpose of starting an induction motor, star/delta switch is an equivalent to auto transformer of ratio

 50%
 33.3%
 57.7%
 66.3%

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Electrical Machines
A 3 - Φ, 4 pole IM is supplied from a 50 Hz source. Calculate rotor frequency when rotor runs 600 rpm?

  30 Hz.
 20 Hz.
 35 Hz.
  Can be determined.

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Electrical Machines
The self induced emf in the coil undergoing commutation is called the

None of these
  reactance voltage.
  dynamically induced voltage.
  statically induced voltage.

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Electrical Machines
A series generator is connected in series to a feeder having 0.5Ω resistance to boost the voltage. The induced voltage is given by Eg = 0.6Ia, Ra = 0.2Ω and Rs = 0.3Ω. Find the voltage boosted by the generator, when delivering 400 Amp?

 90 V.
 30 V.
 60 V.
 40 V.

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

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

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Electrical Machines
A 3 - φ induction motor can also be referred to as a

  repulsion motor.
  shunt motor.
  asynchronous motor.
  transformer.

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