Regulated D.C. Power Supply

31. The load voltage is approximately constant when a Zener diode is __________

1. Forward biased
2. Unbiased
3. Reverse biased
4. Operating in the breakdown region

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32. The rupture of co-valent bonds will occur when the electric field is __________

1. 100 V/cm
2. 6 V/cm
3. 1000 V/cm
4. More than 105 V/cm

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33. The Zener current will be minimum when __________

1. Load current is maximum
2. Load current is minimum
3. Load current is zero
4. None of the above

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34. Two similar 15 V Zeners are connected in series. What is the regulated output voltage?

1. 15 V
2. 5 V
3. 30 V
4. 45 V

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35. What is true about the breakdown voltage in a Zener diode?

1. It decreases when load current increases
2. It destroys the diode
3. It equals current times the resistance
4. It is approximately constant

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36. When load current is zero, the Zener current will be __________

1. Zero
2. Minimum
3. Maximum
4. None of the above

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37. Which of these is the best description for a Zener diode?

1. It is a diode
2. It is a constant current device
3. It is a constant-voltage device
4. It works in the forward region

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38. Zener diode are generally made of __________

1. Germanium
2. Silicon
3. Carbon
4. None of the above

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39. Zener diode can be used as __________

1. c. voltage regulator only
2. c. voltage regulator only
3. both d.c. and a.c. voltage regulator
4. none of the above

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