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Electrical Machines

Electrical Machines
When the rotor of a 3 phase induction motor is blocked then the slip is

 0.7.
 0.3.
  1.
  0.54.

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Electrical Machines
The voltage regulation of a DC generator at full load being zero implies that the generator is

  cumulatively compounded.
  series connected.
 shunt connected.
  deferentially compounded.

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Electrical Machines
A 4-pole DC generator runs at 1500 rpm. The frequency of current in the armature winding is:

 25 Hz.
 100 Hz.
 50 Hz.
 Zero Hz.

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Electrical Machines
In a DC compound motor the field regulator is provided to

 demagnetize the field partially.
 control the field flux.
 control the armature flux.
 limit the armature current.

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Electrical Machines
What will be the e.m.f. generated by a 4 pole lap connected DC Generator rotating at 1500 r.p.m.? Its flux per pole is 0.4 mWb and total no of armature conductors is 1000.

 40 volts.
 10 volts.
 20 volts.
 30 volts.

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Electrical Machines
An ideal DC generated is one that has _____________ voltage regulation.

 low.
 negative.
 positive.
  zero.

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