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Electrical Machines

Electrical Machines
The current drawn by a 220 V DC series motor of armature resistance 0.5 Ω and back emf of 200 V is

 40 A.
 44 A.
 440 A.
 400 A.

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Electrical Machines
In which of the following generators negative voltage regulation can occur?

 both B and C
 series generators
 over compound generator
 shunt generator

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Electrical Machines
Synchronous condensers are used to

 reduce hunting
All of these
 improve starting torque
 improve the power factor

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Electrical Machines
In a transformer which of the following losses are zero?

 Copper loss
All of these
 Iron loss
 Rotational loss

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Electrical Machines
The efficiency of a transformer is mainly dependent on

 dielectric losses.
 stray losses.
 copper losses.
 core losses.

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Electrical Machines
If the excitation is increased, the power factor is

 unity power factor
None of these
 lagging power factor
 leading power factor

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