Semiconductor Diode

21. If the arrow of crystal diode symbol is positive w.r.t. bar, then diode is __________ biased.

1. forward
2. reverse
3. either forward or reverse
4. none of the above

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22. If the doping level in a crystal diode is increased, the width of depletion layer __________

1. remains the same
2. is decreased
3. in increased
4. none of the above

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23. If the doping level of a crystal diode is increased, the breakdown voltage __________

1. remains the same
2. is increased
3. is decreased
4. none of the above

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24. If the PIV rating of a diode is exceeded, __________

1. the diode conducts poorly
2. the diode is destroyed
3. the diode behaves like a zener diode
4. none of the above

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25. If the temperature of a crystal diode increases, then leakage current __________

1. remains the same
2. decreases
3. increases
4. becomes zero

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26. In the breakdown region, a zener didoe behaves like a __________

1. source.
2. constant voltage
3. constant current
4. constant resistance

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27. Mains a.c. power is converrted into d.c. power for __________

1. lighting purposes
2. heaters
3. using in electronic equipment
4. none of the above

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28. The __________ filter circuit results in the best voltage regulation

1. choke input
2. capacitor input
3. resistance input
4. none of the above

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29. The d.c. resistance of a crystal diode is __________ its a.c. resistance

1. the same as
2. more than
3. less than
4. none of the above

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30. The disadvantage of a half-wave rectifier is that the __________

1. components are expensive
2. diodes must have a higher power rating
3. output is difficult to filter
4. none of the above

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