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Electrical Machines

Electrical Machines
A shunt generator is running at 1000 rpm. If flux is reduced by half, then what is the new speed?

 2000.
 1000.
 0.
 500.

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Electrical Machines
What happens if fifth multiples of harmonics is given to induction motor?

  Either short circuit or open circuit occurs.
  Fail to start.
  It will rotates in normal operation.
  It will rotates in reverse direction.

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Electrical Machines
A 4 pole 50 Hz 1-phase induction motor is running at 1470 rpm. Find the forward and backward slips?

 0.04, 0.96
 0.02, 0.98
 0.04, 1.96
 0.02, 1.98

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Electrical Machines
Armature reaction in DC generators will result in

 increase in slip.
 reduction in generated emf.
 short circuit.
 open circuit.

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Electrical Machines
Ward Leonard control is provides speed control

  In one direction only.
  Above rated speed.
  Below rated speed.
  In both direction.

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Electrical Machines
Shunt field of DC generators consists of--------number of turns and ---------- conductors respectively

 less and thick
 less and thin
 large and thick
 large and thin

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