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Electrical Machines

Electrical Machines
Slip rings of an induction motors are made of

  stainless steel.
  phosphor bronze.
  aluminium.
  carbon.

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Electrical Machines
Cross magnetization effects which of the following?

 reduces the terminal voltage
 both 2 and 3
 reduction in main field flux
 commutation

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Electrical Machines
A DC generator beyond critical resistance will generate

 maximum current.
 no voltage.
 maximum voltage.
 maximum power.

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Electrical Machines
Induction motor operation depends on

 either of these.
 rotating magnetic field.
 stationary magnetic field.
None of these

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Electrical Machines
Which motor cannot be started on no load?

 both B and C
 shunt motors
 cumulative compound motors
 series motors

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Electrical Machines
In an induction motor, what is the ratio of rotor input to rotor copper loss?

 1-S
 S
 1/(1-S)
 1/S

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