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Electrical Machines

Electrical Machines
Pole changing methods are suitable only for ___________ type induction motor.

  none of these.
  linear.
  wound.
  cage.

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Electrical Machines
If the source voltage of a DC motor is increased, which of the following will decrease?

 Operating speed.
 Starting torque, operating speed, full load current.
 Starting torque.
  Full load current.

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Electrical Machines
If we increase the rotor reactance value, the maximum torque will

 decrease
None of these
 not changed
 increase

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Electrical Machines
A 240 V dc series motor takes 40 A when giving its rated output at 1500 rpm. Its resistance is 0.3 Ω. The value of resistance which must be added to obtain rated torque at 1000 rpm is

 1.9 Ω
 5.7 Ω
 6 Ω
 2.2 Ω

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

 90°.
  about 75°.
 0°.
 about 115°.

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Electrical Machines
In an ideal DC generator the regulation is

 zero.
 high.
 positive.
 low.

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