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Electrical Machines

Electrical Machines
At stand still condition the value of slip is

 1
 infinite value
 0
 finite value

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Electrical Machines
The rotor of a three phase induction motor has an impedance of 0.4 + j4 ohm per phase at standstill the maximum torque occurs at a slip of _____________.

 25 %.
 50 %.
 15 %.
  10 %.

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Electrical Machines
A 4 pole lap wound dc generator has 4 brushes, if one of the brush is damaged, what will be the change in V, I and P ratings

 V/2, I and P/2
 V, I and P
 V/2, I/2 and P/4
 V, I/2 and P/2

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Electrical Machines
If the excitation is critical, the power factor of the alternator is

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

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Electrical Machines
Dynamic braking is employed to brake

 both 1 and 2
 non reversing drive
None of these
 reversing drive

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Electrical Machines
Synchronous condensers are used to

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

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