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Electrical Machines

Electrical Machines
A shunt generator is running at 1000 rpm. If flux is reduced by half, then what is the new speed?

 1000.
 2000.
 0.
 500.

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Electrical Machines
The 3 - Φ induction motor with rotor circuit open will

  get over heated.
  make noise.
  not run.
  run normally.

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Electrical Machines
In dc machines, the space waveform of the air-gap flux distribution affects

 torque but not the voltage
 voltage but not the torque
 neither the voltage nor the torque
 both the torque and voltage

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Electrical Machines
If the temperature of armature resistance is increased, the speed of a series motor would

 increase.
 not change.
 None of above.
 decrease.

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Electrical Machines
Lap winding is prefered for which type of machines?

 low current and low voltage
 high current and low voltage
 high current and high voltage
 low current and high voltage

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Electrical Machines
Which of the following will vary the maximum torque?

 both 1 and 2
 rotor reactance X
 rotor resistance R
None of these

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