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Electrical Machines

Electrical Machines
The 3 - Φ induction motor with rotor circuit open will

  not run.
  run normally.
  make noise.
  get over heated.

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Electrical Machines
In a single phase transformer the magnitude of leakage reactance is twice that of resistance of both primary and secondary. With secondary short circuited, the input power factor is

 1/√2
 2/√5
 1/3
 1/√5

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Electrical Machines
Synchronous reactance of an alternator represents

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

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Electrical Machines
The power flow of a dc motor, with respect to a DC generator is

  modified.
  none of these.
  increased.
  reversed.

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Electrical Machines
The emf induced in the dc generator armature winding is

 AC and DC
 DC
None of these
 AC

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Electrical Machines
Transformers operating in parallel will share the load depending upon their

 percentage impedance.
 efficiency.
 leakage reactance.
 rating.

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