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Electrical Machines
The synchronous speed of an induction motor will be increased by
increasing number of poles.
increasing of frequency.
decreasing of frequency.
speed can not be increased.
increasing number of poles.
increasing of frequency.
decreasing of frequency.
speed can not be increased.
Answer
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Related Question
Electrical Machines
Addition of 0.3 % to 4.5 % silicon to iron
increases the electrical resistivity of iron.
increases the hysteresis loss.
None of these
reduces the saturation magnetization.
increases the electrical resistivity of iron.
increases the hysteresis loss.
None of these
reduces the saturation magnetization.
Answer
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Electrical Machines
Which of the following bearings and their uses are correct
roller bearings → large machines
neither 1 nor 2
ball bearings → small machines
both A and B
roller bearings → large machines
neither 1 nor 2
ball bearings → small machines
both A and B
Answer
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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%
95%
94%
92%
96%
95%
94%
Answer
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Electrical Machines
In synchronous motor the torque is proportional to
1/P²
1/P
Power P
P²
1/P²
1/P
Power P
P²
Answer
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Electrical Machines
In speed control of DC Series motor, speed lower than the rated speed can be obtained by
Any of the above.
Connecting an additional resistance in the field circuit.
Connecting an additional resistance in stator circuit.
Connecting an additional resistance in the armature circuit.
Any of the above.
Connecting an additional resistance in the field circuit.
Connecting an additional resistance in stator circuit.
Connecting an additional resistance in the armature circuit.
Answer
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