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Electrical Machines
In synchronous motor the torque is proportional to
1/P
P²
1/P²
Power P
1/P
P²
1/P²
Power P
Answer
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Related Question
Electrical Machines
The armature mmf in a dc machine is 1. stationary with respect to field poles 2. stationary with respect to armature 3. rotating with respect to field poles 4. rotating with respect to armature From these, the correct answer is
1, 3
2, 3
2, 4
1, 4
1, 3
2, 3
2, 4
1, 4
Answer
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Electrical Machines
Which of the following is done in speed control of DC motor by field flux control?
Inserting resistance to armature circuit and field circuit.
Any of above.
Inserting an additional resistance in the field circuit.
Inserting an additional resistance in the armature circuit.
Inserting resistance to armature circuit and field circuit.
Any of above.
Inserting an additional resistance in the field circuit.
Inserting an additional resistance in the armature circuit.
Answer
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Electrical Machines
In an induction motor, the no-load slip is generally equal to
1.5 %.
less than 1 %.
4 %.
zero.
1.5 %.
less than 1 %.
4 %.
zero.
Answer
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Electrical Machines
The armature resistance of a permanent magnet dc motor is 0.8 Ohm. At no load, the motor draws 1.5 A from a supply voltage of 25 V and runs at 1500 rpm. The efficiency of the motor while it is operating on load at 1500 rpm drawing a current of 3.5 A from the same source will be
59.2%.
48.0%.
57.1%.
88.8%.
59.2%.
48.0%.
57.1%.
88.8%.
Answer
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Electrical Machines
φA DC shunt machine generates 250 V on open circuit at 1000 RPM. Armature resistance is 0.5 Ω, field resistance 250 Ω. When running as a motor takes 4 A at 250 V. Calculate the speed when running as a motor taking 40 A at 250 V. Armature reaction weakens the field by 4%.
920 RPM
960 RPM
940 RPM
970 RPM
920 RPM
960 RPM
940 RPM
970 RPM
Answer
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