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Electrical Machines

Electrical Machines
From no load to full load the slip will

 slightly increase.
None of these
 slightly decrease.
 not change.

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Electrical Machines
Rotor resistance speed control is used in

 synchronous motor.
 squirrel cage induction motor.
 dc shunt motor.
 slip ring induction motor.

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Electrical Machines
Two mechanically coupled alternators deliver power at 50 Hz and 60 Hz respectively. The highest speed of the alternators is

  3000 rpm.
  500 rpm.
  3600 rpm.
  600 rpm.

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Electrical Machines
A series generator is connected in series to a feeder having 0.5Ω resistance to boost the voltage. The induced voltage is given by Eg = 0.6Ia, Ra = 0.2Ω and Rs = 0.3Ω. Find the voltage boosted by the generator, when delivering 400 Amp?

 30 V.
 90 V.
 60 V.
 40 V.

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Electrical Machines
The magnetic circuit of a dc shunt generator with negligible armature resistance and brush contact voltage drop remains unsaturated when it delivers full-load current at rated terminal voltage. The brushes are kept in the interpolar axis and speed is maintained constant. When the load is switched off, the terminal voltage would

 remain the same
 increase
 become zero
 decrease

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Electrical Machines
In dc machines, the space distribution of air-gap flux density wave at no load is

 sinusoidal
 rectangular
 co- sinusoidal
 flat-topped

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