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Electrical Machines

Electrical Machines
The slot edges in a DC machine are made of

 Cast iron.
 Silicon steel.
  Fibre.
 Mild steel.

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Electrical Machines
Rotor resistance speed control is used in

 squirrel cage induction motor.
 slip ring induction motor.
 dc shunt motor.
 synchronous motor.

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Electrical Machines
Dynamic braking is very effective for

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

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Electrical Machines
If s is the slip and f is the supply frequency of an induction motor, the frequency of rotor current is given by

  sf / 2.
  s2.
  sf.
  f / s.

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Electrical Machines
Synchronous reactance of an alternator represents

All of these
 field winding reactance
 a reactance operating at synchronous speed
 armature reactance and leakage reactance

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Electrical Machines
When an electric train is moving down a hill, the DC motor will operate as

 DC shunt motor.
  DC series generator.
  DC series motor.
 DC shunt generator.

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