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Electrical Machines

Electrical Machines
The slip of an induction motor during DC rheostatic braking is

 2 + s.
 1 - s.
  2 - s.
  s.

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Electrical Machines
The emf induced in a conductor rotating in a bipolar field is

 AC.
None of these
 both of above.
 DC.

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Electrical Machines
The full load copper loss and iron loss of transformer are 6400W and 5000W respectively. The copper loss and iron loss at half load will be respectively?

 3200 W and 2500 W
 3200 W and 5200 W
 1600 W and 1250 W
 1600 W and 5000 W

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Electrical Machines
A flat compound generator is obtained from compound generator by connecting a variable resistor

 in series with the shunt field
 in parallel with the shunt field
 in series with the series field
 in parallel with the series field

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Electrical Machines
In electric locomotives which of the following motor are used ?

 DC series motor.
 DC Shunt motor.
 Synchronous motor.
 DC compound motor.

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Electrical Machines
Generator works on the principle of production

 dynamically induced emf.
None of these
 static induced emf.
 both A and B.

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