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Electrical Machines

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

 negative.
  zero.
 positive.
 low.

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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

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

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Electrical Machines
R1 is the resistance of the primary winding of the transformer. The turn ratio in terms of primary to secondary is K. Then the equivalent resistance of the primary referred to secondary is

 R1 /K
 K×R1
 R1 /K²
 K²R1

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Electrical Machines
Which of the following machines have highest power factor with respect to magnetizing current?

 Semi closed slot type machine.
 Open slot type machines.
 Closed slot type machines.
 Any of the above.

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Electrical Machines
The frame of an induction motor is made of

  closed grained cast iron.
  stainless steel.
  silicon steel.
  aluminium.

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Electrical Machines
The power flow of a dc motor, with respect to a DC generator is

  none of these.
  modified.
  reversed.
  increased.

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