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Electrical Machines

Electrical Machines
Which of the following DC generators has rising V-I characteristics?

  None of them.
  Compound.
  Shunt.
  Series.

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Electrical Machines
Alternator operates on the principle of

  self or mutual induction.
  mutual induction.
  self induction.
  electromagnetic induction.

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Electrical Machines
If a DC Series motor is connected across an AC supply it will

 not run.
 run at lower speed.
 run at normal speed.
 burn.

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Electrical Machines
In DC machines internal characteristics are plotted between

 Vt vs Ia
 Vt vs load current
 Eg vs Ia
 Eg vs load current

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Electrical Machines
A 250 V DC generator in run at rated speed with no excitation. The open circuit voltage will be

 about 100 V.
  250 V.
  very small, say about 2 or 3 V.
  zero.

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Electrical Machines
An unexcited single phase synchronous motor is

 repulsion motor.
  universal motor.
 AC series motor.
 reluctance motor.

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