Alternate Questions

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Q1:-Which of the following class is mainly used in electrical machines for insulation

1. class Y
2. class A
3. class F
4. class C

ANSWER:-2

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Q2:-When the excitation of synchronous motor is varied 

1. the pf and the armature current varies 
2. the pf varies but the armature current does no vary 
3. the armature current varies but the pf does not vary 
4. neither the pf nor the armature current varies

ANSWER:-1

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Q3:-For steady flux and good mechanical properties the material extensively used for magnetic circuit is 

1. iron 
2. cast iron
3. grey cast iron
4. cast steel

ANSWER:-3

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Q4:-The resistance of insulation material is 

1. proportional to its resistivity
2. inversely proportional to its resistivity
3. independent of the temperature 
4. independent of material

ANSWER:-1

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Q5:-When a substance is placed in a magnetic field its ability to get magnetised depends upon its 

1. permittivity
2. permeability
3. susceptibiltiy
4. none of these

ANSWER:-3

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