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Electrical Machines
The power factor of squirrel cage induction motor is
both A and B
low at rated load only
low at heavy loads only
low at light loads only
both A and B
low at rated load only
low at heavy loads only
low at light loads only
Answer
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Related Question
Electrical Machines
Consider the following statements about commutating poles which are fitted on most large dc Shunt motors: 1. The commutating poles are placed in the geometric neutral plane and their number is usually Equal to the number of main poles 2. The winding on the commutating poles is connected in series with the shunt-field winding on the main poles 3. The polarity of the commutating pole must be that of the next pole further ahead 4. The commutating poles neutralize the reactance voltage produced in the coil undergoing Commutation. Of these statements,
2, 3 and 4 are correct
1 and 4 are correct
1, 2 and 4 are correct
1, 2 and 3 are correct
2, 3 and 4 are correct
1 and 4 are correct
1, 2 and 4 are correct
1, 2 and 3 are correct
Answer
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Electrical Machines
Consider the following statements regarding the magnetization characteristics of a dc generator : 1. It represents the variation of field flux with field current. 2. Variation of open-circuit terminal voltage with field current is independent of speed 3. It is non-linear from zero to rated field current 4. It helps to determine the critical field resistance at a given speed 5. It always starts from the origin Which of these statements are correct ?
3 and 5
2, 3 and 4
1 and 4
1, 2 and 5
3 and 5
2, 3 and 4
1 and 4
1, 2 and 5
Answer
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Electrical Machines
Star - delta method of starting of motor is not possible in case of
single phase induction motor.
high torque motor.
high speed motor.
low horse power motor.
single phase induction motor.
high torque motor.
high speed motor.
low horse power motor.
Answer
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Electrical Machines
The slip of an induction motor normally does not depend on
shaft torque.
synchronous speed.
core loss component.
rotor speed.
shaft torque.
synchronous speed.
core loss component.
rotor speed.
Answer
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Electrical Machines
To have sparkless commutation, the armature reaction effect in a DC machine is neutralized by
increasing field excitation.
shifting the brush axis from GNA to MNA.
compensating winding and commutating poles.
fixing the brush axis inline with the pole axis.
increasing field excitation.
shifting the brush axis from GNA to MNA.
compensating winding and commutating poles.
fixing the brush axis inline with the pole axis.
Answer
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