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Electrical Machines
A self-excited shunt generator fails to build up, because 1. the field circuit is open 2. The armature circuit is open 3. the residual magnetism is absent 4. The direction of rotation is wrong From these, the correct answer is
1, 2, 3 and 4
1, 2 and 3
3 only
1, 3
1, 2, 3 and 4
1, 2 and 3
3 only
1, 3
Answer
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Related Question
Electrical Machines
A 220 V dc machine has an armature resistance of 1Ω.If the full-load current is 20 A, the differenc in the induced voltages when the machine is running as a motor and as a generator is
zero
20 V
50 V
40 V
zero
20 V
50 V
40 V
Answer
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Electrical Machines
Hunting in a synchronous motor takes place
motor is under loaded.
when power factor is unity.
when load varies.
when supply voltage fluctuates.
motor is under loaded.
when power factor is unity.
when load varies.
when supply voltage fluctuates.
Answer
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Electrical Machines
What is/are the necessary conditions for voltage build up in self excited generator?
Field winding should be properly connected to armature winding.
All of these
Poles should contain residual flux.
Field winding resistance should be less than critical resistance.
Field winding should be properly connected to armature winding.
All of these
Poles should contain residual flux.
Field winding resistance should be less than critical resistance.
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 ?
2, 3 and 4
1, 2 and 5
3 and 5
1 and 4
2, 3 and 4
1, 2 and 5
3 and 5
1 and 4
Answer
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Electrical Machines
The crawling in the induction motor is caused by
low voltage supply
high loads
improper design of stator laminations
harmonics developed in the motor
low voltage supply
high loads
improper design of stator laminations
harmonics developed in the motor
Answer
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