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Electrical Machines

Electrical Machines
The field divertor resistance for a DC series motor is of order of

 10 Ω
 100 Ω
 0.1 Ω
 50 Ω

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Electrical Machines
If a shunt generator delivers 100 A at 200 V, and the resistances of the shunt field and armature are 100 ohms and 0.01 ohms respectively, the generator emf will be

  no resistance is connected.
  parallel.
  any one of the connection.
  series.

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

 60W
 100W
 40W
 80W

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Electrical Machines
Demagnetization effects which of the following?

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

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Electrical Machines
In an auto-transformer, power is transferred through

 both A and B.
 induction process only.
None of these
 conduction process only.

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Electrical Machines
Which of the following voltage regulation method is accurate ?

 MMf method
 Synchronous impedance method
 ZPF method
 American standard association method

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