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Electrical Machines
The power factor of an induction motor operating at no load will have a value around
unity
0.9 lag
0.2 lead
0.2 lag
unity
0.9 lag
0.2 lead
0.2 lag
Answer
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Related Question
Electrical Machines
When maximum flux density is constant, the eddy current losses are proportional to
f
f2
V2
V
f
f2
V2
V
Answer
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Electrical Machines
In DC machine shape of armature MMF wave is?
Triangular and directed towards main pole.
Peaky in nature.
Saddle shape.
Triangular and directed towards brush axis.
Triangular and directed towards main pole.
Peaky in nature.
Saddle shape.
Triangular and directed towards brush axis.
Answer
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Electrical Machines
Rotor resistance speed control is used in
dc shunt motor.
synchronous motor.
squirrel cage induction motor.
slip ring induction motor.
dc shunt motor.
synchronous motor.
squirrel cage induction motor.
slip ring induction motor.
Answer
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Electrical Machines
For a fault at the terminal of a synchronous generator, the fault current is maximum for a
line to ground fault.
3 - phase to ground fault.
3 - phase fault.
line to line fault.
line to ground fault.
3 - phase to ground fault.
3 - phase fault.
line to line fault.
Answer
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Electrical Machines
A compound dc generator is delivering full load current at a terminal voltage of 230 V. Its series-field winding gets short circuited. If its terminal voltage 1. becomes more than 230 V, it is overcompounded generator 2. becomes more than 230 V, it is differentially compounded generator 3. becomes less than 230 V, it is overcompounded generator 4. becomes less than 230 V, it is differentially compounded generator 5. becomes less than 230 V, it is level compounded generator From these, the correct answer is
2,3
2, 3, 5
1, 4, 5
1, 4
2,3
2, 3, 5
1, 4, 5
1, 4
Answer
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