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Electrical Machines

Electrical Machines
The rotor power output of 3-phase induction motor is 15 KW. The rotor copper losses at a slip of 4% will be

 625 W
 700 W
 650 W
 600 W

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Electrical Machines
Conservator tank is used

 for better cooling of transformer.
 to act as an oil storage.
None of these
 to take up the expansion of oil due to temperature rise.

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Electrical Machines
Which of the following induction motor has maximum speed?

  2 pole.
 6 pole.
 4 pole.
 8 pole.

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Electrical Machines
Stability of a synchronous motor ---------- with the increase in excitation.

 remains unaffected
 any of the above
 decreases
 increases

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Electrical Machines
Demagnetization effects which of the following?

 reduces the terminal voltage
 reduction in main field flux
 commutation
 both B and C

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

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

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