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Electrical Machines

Electrical Machines
An induction motor has synchronous speed of 1500 rpm. What will be the slip when it is running at a speed of 1450 rpm?

 -3.33%
 +3%
 -3%
 +3.33%

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Electrical Machines
In DC machine shape of main field flux distribution is?

 flat tapped or trapezoidal
 saddle shape
 peaky in nature
 triangular

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Electrical Machines
A three phase induction motor has a synchronous speed of 1500 rpm the machine runs at 1460 rpm at a particular load. The slip at this load is ___________.

 5 %.
 1.5 %.
  2.67 %.
  30 %.

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

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

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Electrical Machines
Secondary winding of an auto transformer is also called

 damping winding.
 compensating winding.
  common winding.
 tertiary winding.

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Electrical Machines
The slip of an induction motor normally does not depend on which of the following?

  Core loss component.
 Shaft torque.
 Synchronous speed.
 Rotor speed.

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