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Electrical Machines

Electrical Machines
A 3-phase, 50Hz, 4 pole induction motor is running at 1440 rpm and rotor input power is 2KW. Find the rotor output power?

 1450W
 1820W
 1920W
 2000W

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Electrical Machines
In dc motors, under leading pole tips flux density will--------?

 increase
 decrease
 either increase or decrease
None of these

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Electrical Machines
In a single phase induction motor driving a fan load, the reason for having a high resistance rotor is to achieve

 low starting torque.
  quick acceleration.
 high efficiency.
 reduced size.

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Electrical Machines
An auto transformer having a transformation ratio of 0.8 supplies a load pf 10 KW. The power transfered inductively from the primary to secondary is

 0.
 8 KW.
 10 KW.
  2 KW.

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Electrical Machines
In a single phase induction motor, the starting torque developed is proportional to

 supply voltage V
 V²
 1/V²
 1/V

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Electrical Machines
The use of higher flux density in the transformer design

 increases the weigh per KVA
None of these
 has no relation with the weight of transformer
 reduces the weigh per KVA

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