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Electrical Machines

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

 AC.
 both of above.
 DC.
None of these

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Electrical Machines
In an auto transformer, for what value of turn ratio, power transferred by inductively and conductively are same?

 0.5
 any of the above
 1
 0

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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/√5
 1/3
 2/√5
 1/√2

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Electrical Machines
What is the reason for stationary armature essential in alternators above 5 KVA?

 Operating cost is less.
All of these
 Collecting of large current is simple.
 Insulation requirement is less.

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Electrical Machines
A dc motor with armature resistance of 0.5 ohms connected directly to a 230 Volt supply. If the armature is stationary then the current flowing through armature is

 250 A.
  340 A.
  460 A.
 570 A.

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Electrical Machines
A 3-phase, 50 Hz, 4 pole induction motor is running at 1440 rpm. Find the rotor efficiency?

 96%
 92%
 94%
 95%

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