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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

 0 Hz
 1 Hz
 5 Hz
 50 Hz

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Electrical Machines
The volt-ampere euation for a long-shunt compound motor is given by

 Vt = Ea + Ia(ra + rs)
 Vt= Ea + Iara
 Vt= Ea– Iara
 Vt = Ea + Iara+ ILrs

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Electrical Machines
A 3 - Φ induction motor draws an current of 50 A from mains when starts by direct switching. If an auto transformer with 60 % tapping is used for starting the current drawn from the mains will be

  18.
 80.
 50.
 36.

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Electrical Machines
Which of following motor is preferred for belt conveyor?

  Synchronous motors.
  Reluctance motor.
  Slip ring induction motor.
  Universal motor.

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Electrical Machines
The core flux in transformer depends mainly on

 supply voltage and frequency
 supply voltage
 supply voltage and load
 supply voltage, frequency and load

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Electrical Machines
If input of a transformer is square wave the output will be

 sine wave.
 triangular wave.
  pulsed wave.
 square wave.

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