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Electrical Machines

Electrical Machines
Voltage regulation of transformer is given by

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

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Electrical Machines
A large series motor is never started without some mechanical load on it because otherwise it will

 develop excessive speed and damage itself.
 draw too much current.
 open fuse or circuit breaker.
 produce sparking at brushes.

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Electrical Machines
The power factor of an induction motor operating at no load will have a value around

 0.9 lag
 0.2 lag
 0.2 lead
 unity

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Electrical Machines
The back emf produced in a dc motor depends on

  P.
  P and Z.
  Z.
  none of these.

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Electrical Machines
An induction motor has a rotor resistance of 0.002 Ω / phase. If the resistance is increased to 0.004 Ω / phase then the maximum torque will

 reduced to half
 remain unaltered
 increase by 100%
 increase by 200%

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Electrical Machines
The speed regulation of a DC motor is given as

 NnL − NfL.
 (NnL − NfL)/NfL.
 NnL/NfL.
 (NfL − NnL)/NnL.

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