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Electrical Machines

Electrical Machines
The current drawn by a DC motor at the time of starting is

 Very low.
 Very high.
 Zero.
 Normal.

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Electrical Machines
For pure resistive load what is the armature reaction?

 magnetization
 demagnetization
All of these
 cross magnetization

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Electrical Machines
A 220 V DC generator is run at full speed without any excitation. The open circuit voltage will be

  about 50 V.
  about 2 V.
  220 V.
  zero.

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Electrical Machines
Which one of the following statement is correct ? In an induction motor if the air gap is increased then

 its power factor will reduce
 its speed will reduce
 its speed will increase
 its efficiency will improve

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Electrical Machines
An induction motor is, in general analogous to

 two winding transformer with secondary short circuited.
 two winding transformer with secondary open circuited.
 auto transformer.
None of these

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Electrical Machines
Series field consists of--------number of turns and ---------- conductors respectively

 less and thin
 large and thin
 large and thick
 less and thick

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