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Electrical Machines

Electrical Machines
Hysteresis loss is proportional to

 f2.
  f.
 f1.5.
 f3.

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Electrical Machines
The principal of starting of 3 - Φ IM is similar to

  transformer with short-circuited secondary.
  synchronous motor.
  capacitor run IM.
  repulsion motor type starting.

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Electrical Machines
If the load current and the flux of a DC motor are held constant and voltage applied across its armature is increased by 5%, the speed of the motor will

 depend on other factors.
 increase by 5 %.
 remain unchanged.
 reduce by 5 %.

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Electrical Machines
Which of the following alternators contain large number of poles?

None of these
 Turbo alternators.
 Aame in both alternators.
 Hydro alternators.

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Electrical Machines
The use of double squirrel cage winding on the rotor provides

 reduced starting torque.
 low noise.
 higher efficiency.
  a large starting torque.

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Electrical Machines
The output power indicated on the name plate of any motor is always the

 Gross power.
 Power drawn in KW.
 Power drawn in KVA.
 Output power at the shaft.

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