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Electrical Machines

Electrical Machines
A 3-phase, 2 pole, 12 slot synchronous machine is operating at synchronous speed. Find the slot angle?

 60°
 18°
 30°
 20°

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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
A dc shunt motor runs at a no-load speed of 1140 rpm. At full load, armature reaction weakens the main flux by 5% whereas the armature circuit voltage drops by 10%. The motor full-load speed in rpm is

 1203
 1080
 1000
 1200

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Electrical Machines
If an AC servomotor has one of its winding excited by AC, then voltage measured at the other winding with rotor running will be

  proportional to rotor speed.
 proportional to square of rotor speed.
 constant independent of speed.
 zero.

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Electrical Machines
What is the effect of armature reaction ?

  Both option B and C.
 None of the options.
 Armature flux weakens the main field flux.
 Armature flux distorts the main field flux.

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Electrical Machines
A single phase transformer when supplied from 220 V, 50 Hz has eddy current loss of 50 W. If the transformer is connected voltage of 330 V, 75 Hz, the eddy current loss will be

 168.75 W
 75 W
 50 W
 112.5 W

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