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Electrical Machines

Electrical Machines
The supply voltage to an induction motor is reduced by 10%. By what percentage, approximately, will the maximum torque decrease?

 19%
 10%
 5%
 40%

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Electrical Machines
Type of single phase motor having highest power factor at full load is

  shaded pole type.
  split phase.
  capacitor start.
  capacitor run.

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Electrical Machines
A 3-phase, 50 Hz, 4 pole induction motor is running at 1440 rpm. Find the rotor efficiency?

 95%
 94%
 96%
 92%

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Electrical Machines
In dc machines, the space waveform of the air-gap flux distribution affects

 torque but not the voltage
 neither the voltage nor the torque
 both the torque and voltage
 voltage but not the torque

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

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

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Electrical Machines
Counter emf of a DC motor

 helps in energy conversion.
 aids applied voltage.
 exceeds supply voltage
 regulates its armature voltage.

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