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Electrical Machines

Electrical Machines
Voltage regulation of transformer is given by

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

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Electrical Machines
Which of the following machine will have maximum efficiency?

 Induction motor.
  Electrical power transformer.
 DC motor.
 Electrical power generator.

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Electrical Machines
Armature reaction effect is more in which of the following methods?

 field weakening method
 same in both methods
None of these
 armature resistance control

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Electrical Machines
In case the conditions for maximum power for DC motor are established, the efficiency of the motor will be

 Less than 50 %
 Around 90 %
 Any where between 75 % and 90 %.
 Around 100 %.

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Electrical Machines
In an ideal DC generator the regulation is

 low.
 positive.
 high.
 zero.

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Electrical Machines
A smaller air gap in a induction motor helps to

 reduce the magnetizing current.
 increase the starting torque.
 reduce the chance of crawling.
 reduce the chance of cogging.

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