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Electrical Machines

Electrical Machines
A Shunt generator running at 1000 rpm has generated emf of 100 V. If the speed increases to 1200 rpm, the generated emf will be nearly

 120 V
 175 V
 140 V
 240 V

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Electrical Machines
In a seperately excited DC Motor if field current is increased, it will

 Reduce starting torque.
 Reduce armature heating.
 Increase acceleration duration.
 Increase speed

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Electrical Machines
Which of the following DC Motor requires 3 point starter?

  Series motor.
  Shunt, compound and series motor.
  Shunt motor.
  Shunt motor as well as compound motors.

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Electrical Machines
Commutators in DC machines have a role of which converts

 high voltage DC to low voltage DC.
 Both AC to DC and DC to AC.
 AC to DC.
 none of these.

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Electrical Machines
Synchronous reactance of an alternator represents

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

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Electrical Machines
A 20KVA auto transformer, turn ratio is 0.8. Find the power transferred conductively?

 16KVA
 4KVA
 0KVA
 20KVA

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