DC Machine

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Q1:-Which of the following statements is incorrect in dc shunt generators about hysteresis loss?

1. it can be minimized by laminating the armature
2. it is independent of laminating thickness
3. it depends upon the supply frequency 
4. none of these

ANSWER:-1

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Q2:- An ideal dc generator has a regulation of 

1. 0 %
2. 50 %
3. 75 %
4. 100 %

ANSWER:-1

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Q3:-Which of the following methods is most economical for finding the no load losses of a large dc shunt motor ?

1. hopkinson's test
2. swinburne's test
3. retardation test
4. none of these

ANSWER:-2

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Q4:-Why is the air gap between stator and armature of an electric motor kept as small as possible

1. to get strong magnetic field 
2. to make the rotation easier 
3. to reach a higher speed of rotation
4. to improve the air circulation

ANSWER:-1

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Q5:-The generator of a power station produces an electric pressure by 

1. conversion of heat
2. magnetic induction 
3. conversion of light
4. mechanical pressure
5. ANSWER:-4 

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