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Electrical Machines
The slip of an induction motor normally does not depend on which of the following?
Rotor speed.
Core loss component.
Synchronous speed.
Shaft torque.
Rotor speed.
Core loss component.
Synchronous speed.
Shaft torque.
Answer
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Related Question
Electrical Machines
If dimension of all the parts of a synchorous generator and the number of field and armature turns are double, then generated voltage will change by a factor of
8.
4.
1.
2.
8.
4.
1.
2.
Answer
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Electrical Machines
A single-phase transformer has its maximum efficiency at 60 percent of full load. At full load copper loss will be
more than core loss.
zero.
less than core loss.
equal to core loss.
more than core loss.
zero.
less than core loss.
equal to core loss.
Answer
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Electrical Machines
For very sensitive and wide speed control, the preferable control method is
Multiple voltage control.
Field control.
Armature control.
Ward-Leonard control.
Multiple voltage control.
Field control.
Armature control.
Ward-Leonard control.
Answer
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Electrical Machines
A synchronous motor will deliver maximum power when
load angle is equal to internal angle θ.
load angle is 0°.
input power factor is unity.
load angle is 45°.
load angle is equal to internal angle θ.
load angle is 0°.
input power factor is unity.
load angle is 45°.
Answer
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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.
constant independent of speed.
proportional to square of rotor speed.
zero.
proportional to rotor speed.
constant independent of speed.
proportional to square of rotor speed.
zero.
Answer
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