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Electrical Machines

Electrical Machines
In an induction motor, the no-load slip is generally equal to

 4 %.
  zero.
  less than 1 %.
 1.5 %.

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

 92%
 96%
 94%
 95%

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Electrical Machines
If field current is decreased in shunt dc motor, the speed of the motor

 increases.
 decreases.
 remains same.
None of these

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Electrical Machines
A transformer has resistance and reactance in per unit as 0.01 and 0.04 respectively. Its voltage regulation for 0.8 power factor lagging and leading will be

None of these
 3.2% and -1.6%
 6% and -4%
 4.8% and -3.2%

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Electrical Machines
To increase starting torque of a 3-phase slip ring induction motor, preferred method is to increase

 supply voltage
None of these
 rotor resistance
 supply frequency

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Electrical Machines
A 3-phase, 50Hz, 4 pole induction motor is running at 1440 rpm and rotor input power is 2KW. Find the rotor output power?

 2000W
 1450W
 1920W
 1820W

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