Semi Conductor

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Q1:-An electron tube can only operate when

1. anode is negative with respect to cathode
2. anode is positive with respect to cathode 
3. anode must be at zero potential with respect to cathode
4. anode to cathode

ANSWER:-2

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Q2:-The process of conversion ac into dc is called

1. amplification 
2. modulation 
3. rectification 
4. factorisation

ANSWER:-3

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Q3:-The semiconductor are replacing electron tube because they are

1. light in weight 
2. smaller in weight 
3. longer in life and greater in ruggedness
4. all of the above

ANSWER:-4

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Q4:-Oxide Coated cathode is used in

1. low power tubes 
2. medium power tubes
3. high power tube
4. medium and high power tubes

ANSWER:-1

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Q5:-The metal from which the electrons are emitted is called 

1. an emitter
2. a cathode
3. an emitter or a cathode
4. none of these

ANSWER:-3

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