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Electrical Machines

Electrical Machines
What is the highest possible speed of turbo alternators?

 3000 rpm
 1500 rpm
 1000 rpm
 4000 rpm

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Electrical Machines
As compared to DOL starting, a cage induction motor with star-delta starting shall have

 more starting time.
 reduced starting current.
 more starting torque.
 smoother acceleration.

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Electrical Machines
Transformers operating in parallel will share the load depending upon their

 efficiency.
 leakage reactance.
 rating.
 percentage impedance.

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

 2000.
 500.
 0.
 1000.

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Electrical Machines
The back emf produced in a dc motor depends on

  none of these.
  P and Z.
  P.
  Z.

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Electrical Machines
As compared to an induction motor, the air gap in a DC motor is

 same.
 more.
 less than 50%.
 between 50% and 90%.

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