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Electrical Machines

Electrical Machines
Number of slip rings in 3-phase synchronous motor will be

 3 or 4
 2
 1
 0

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Electrical Machines
A dc series motor driving and electric train faces a constant power load. It is running at rated speed and rated voltage. If the speed has to be brought down to 0.25 p.u. the supply voltage has to be approximately brought down to

  0.5 p.u
  0.75 p.u
  0.25 p.u
  0.125 p.u

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Electrical Machines
For a fault at the terminal of a synchronous generator, the fault current is maximum for a

 3 - phase fault.
  line to ground fault.
 line to line fault.
 3 - phase to ground fault.

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Electrical Machines
The sequence of induction motor is RYB, then the direction of induction motor can be changed by which of the following sequence?

 BYR
All of these
 BRY
 RBY

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Electrical Machines
When excitation is increased (over excitation), the synchronous generator operates at

 unity power factor.
 leading power factor.
 any of the above.
 lagging power factor.

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Electrical Machines
Synchronous reactance of an alternator represents

All of these
 field winding reactance
 armature reactance and leakage reactance
 a reactance operating at synchronous speed

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