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Electrical Machines

Electrical Machines
The slot edges in a DC machine are made of

 Mild steel.
 Cast iron.
  Fibre.
 Silicon steel.

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Electrical Machines
There are two 2-pole DC machines. Main field axis of machine A is horizontal and that of B is vertical. It is preferable to purchase

 machine B
 none of these
 any of the two machines
 machine A

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Electrical Machines
Essential conditions for two DC generators are connecting for parallel operation is/are

 polarities should be same.
 terminal voltage should be same.
 rating of generators should be same.
 both A and B.

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Electrical Machines
A short-shunt cumulatively-compounded dc generator builds up a voltage of 220 V at no load at rated speed. If it is operated as a differentially compounded generator, other things remaining the same, it would build up

 6 V
 220 V
 somewhat less than 220 V
 more than 220 V

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Electrical Machines
Which of the following motor is expensive for same Kw output rates?

 DC Shunt Motor
 AC single phase motor.
 Induction motor.
 Synchronous motor.

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Electrical Machines
Which of the following statement is true for an AC synchronous motor?

  It is a constant speed motor.
 It is a high reluctance motor.
 It is a variable speed motor.
 It is a step angled motor.

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