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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?

 1000.
 500.
 0.
 2000.

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Electrical Machines
Which single phase motor is used for a refrigerator?

  Capacitor run.
  Repulsion.
  Universal.
  Split phase.

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

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

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Electrical Machines
Semi closed slots or totally closed slots are used in induction motors, essentially to

 increase pull out torque
 improve starting torque
 reduce magnetising current and improve power factor
 decrease starting torque

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Electrical Machines
In a 3-phase induction motor, torque and supply voltage are related as

 T ∝ 1/V
 T∝ V²
 T ∝ V
 T ∝ 1/V²

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Electrical Machines
The speed of a 3-phase induction motor operating in its stable region

 decreases with decrease in the load torque.
 decreases with increase in the load torque.
 remains constant.
 increases with increase in the load torque.

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