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Electrical Machines

Electrical Machines
For satisfactory performance of 3-phase 480V, 60 Hz induction motor, the supply voltage at 50 Hz should be equal to

 400 V.
 420 V.
 350 V.
 480 V.

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Electrical Machines
In applied voltage is reduced in a dc shunt motor

 Full load speed.
  Full load current.
 Full load torque.
 None of these.

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Electrical Machines
A single phase transformer has specifications as 250 KVA, 11000 V/415 V, 50 Hz. What are the values of primary and secondary currents?

 primary = 11.4 A, secondary = 301 A
 primary = 301 A, secondary = 22.7 A
 primary = 22.7 A, secondary = 602.4 A
 primary = 602 A, secondary = 22.7 A

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Electrical Machines
A 230 volt dc motor has an armature winding resistance of 0.5 ohm. Calculate the emf induced by the motor if the full load armature current is 23 ampere.

  None of these.
  120 volt.
  218.5 volt.
 220.4 volt.

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

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

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Electrical Machines
Capacitor start capacitor run provides

  high power factor only.
  none.
  high staring torque and high power factor.
  high staring torque only.

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MORE MCQ ON Electrical Machines

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