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Electrical Machines

Electrical Machines
Voltage regulation of transformer is given by

 (E2 - V2) / V2
 (V2 - E2) / E2
 (V2 - E2) / V2
 (E2 - V2) / E2

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Electrical Machines
The current drawn by a 220 V DC series motor of armature resistance 0.5 Ω and back emf of 200 V is

 44 A.
 400 A.
 40 A.
 440 A.

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Electrical Machines
If the field of a dc shunt motor gets opened while the motor is running, then the

 motor will attain dangerously high speed
 armature will oscillate about original speed as the mean speed
 armature current will drop
 motor will become slow.

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Electrical Machines
In an alternator the voltage generated per phase is proportional to

  frequency of waveform.
  number of turns in coil.
All of these
  flux per pole.

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Electrical Machines
If the field circuit of a DC shunt motor is opened

 The armature current will reduce.
  The motor will attain dangerously high speed.
 The speed of motor will be reduced.
 DC Shunt Motor

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Electrical Machines
Field weakening method is also called as-----------?

 constant torque control
 constant voltage control
 constant current control
 constant power control

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