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Electrical Machines

Electrical Machines
A transformer has maximum efficiency at 3/4 load. The ratio of iron loss and full load copper loss is

 3/4.
 16/9.
 4/3.
 9/16.

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Electrical Machines
A 4 pole 50 Hz induction motor is running at 1470 rpm. Find the speed of stator magnetic field with respect to rotor?

 1470 rpm
 1500 rpm
 30 rpm
 zero

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Electrical Machines
The power factor of squirrel cage induction motor is

 both A and B
 low at light loads only
 low at heavy loads only
 low at rated load only

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Electrical Machines
In above question, find rms line voltage for delta connection?

  230.2 V.
 100 V.
 50 V.
 399 V.

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Electrical Machines
Ward-Leonard control is basically a ___________ control method.

 Armature resistance control.
 Field diverter control.
 Field control.
 Armature voltage control.

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Electrical Machines
A DC series motor drawing an armature current of Ia is operating under saturated magnetic conditions. The torque developed in the motor is proportional to

 1/Ia
 I/Ia2
 Ia2
 Ia

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