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Electrical Machines

Electrical Machines
Voltage regulation of transformer is given by

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

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Electrical Machines
Which type of motors uses slip rings?

 Both Synchronous and Induction motor
 Synchronous motors
 Induction motors
 DC Shunt Motor

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Electrical Machines
To increase starting torque of a 3-phase slip ring induction motor, preferred method is to increase

 rotor resistance
None of these
 supply voltage
 supply frequency

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Electrical Machines
No load saturation characteristics are plotted between

 short circuit current and armature current
 no load voltage and field current
 no load voltage and armature current
 short circuit current and field current

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Electrical Machines
What is the effect of armature reaction ?

 Armature flux distorts the main field flux.
  Both option B and C.
 None of the options.
 Armature flux weakens the main field flux.

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Electrical Machines
The no load current in a transformer lags the applied voltage by

  about 75°.
 0°.
 about 115°.
 90°.

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