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Electrical Machines

Electrical Machines
Slip rings of an induction motors are made of

  stainless steel.
  aluminium.
  phosphor bronze.
  carbon.

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Electrical Machines
The magnetic field which initially induces emf in the armature in a self excited DC generator is because of

None of these
 armature reaction.
  permanent magnets.
  residual magnetism.

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Electrical Machines
A dc shunt motor has external resistance Ra and Rf in the armature and field circuits respectively. Armature current at starting can be reduced by keeping

 Rf maximum and Ra minimum
 Ra maximum and Rf maximum
 Ra maximum and Rf minimum
 Ra minimum and Rf minimum

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Electrical Machines
A motor operates in stable region at which of the following slip?

 unity slip
 low slip region
 both 1 and 2
 high slip region

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Electrical Machines
Dynamic braking is very effective for

 separately excited motors.
 differential compound motors.
 shunt motors.
 series motors.

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Electrical Machines
A 3-phase 6 pole 50 Hz induction motor is running at 5% slip.What is the speed of the motor?

 900 rpm
 850 rpm
 1000 rpm
 950 rpm

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