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Electrical Machines

Electrical Machines
Voltage regulation of transformer is given by

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

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Electrical Machines
A 220 V DC machine has an armature resistance 1Ω. If the full load current is 20 A, the difference of induced voltage and generator is

  40 V.
 20 V.
 0 V.
 60 V.

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Electrical Machines
A differentially compound motor under high-over-load conditions will behave like a / an

 shunt motor.
  series motor.
 cummulative compound motor.
 AC synchronous motor.

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Electrical Machines
DC Shunt Motor has disadvantage(s) of

 not suitable for rapidly changing loads.
 less expensive.
 none of above.
 constant speed.

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Electrical Machines
Eg (generated emf) and Eb (back emf) both are

 different.
 same.
 none of above.
 changes.

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Electrical Machines
For a fault at the terminal of a synchronous generator, the fault current is maximum for a

  line to ground fault.
 3 - phase to ground fault.
 line to line fault.
 3 - phase fault.

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