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Q. No.In the circuit shown in Fig. 14.5, if the diode forward voltage drop is 0.3 V, the voltage difference between A and B is
1. 1.3 V
2. 2.3 V
3. 0
4. 0.5 V
Subtopic: Â PN junction |
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Level 1: 80%+
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Consider an npn transitor with its base-emitter junction forward biased and collector base junction reverse biased. Which of the following statements are true?.
a. Electrons crossover from emitter to collector.
b. Holes move from base to collector.
c. Electrons move from emitter to base.
d. Electrons from emitter move out of base without going to the collector
Choose the correct option:
1. (a), (b), (c)
2. (b), (d)
3. (a), (c)
4. (b), (c)
a. Electrons crossover from emitter to collector.
b. Holes move from base to collector.
c. Electrons move from emitter to base.
d. Electrons from emitter move out of base without going to the collector
Choose the correct option:
1. (a), (b), (c)
2. (b), (d)
3. (a), (c)
4. (b), (c)
Level 3: 35%-60%
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Figure 14.7 shows the transfer characteristics of a base biased CE transistor. Which of the following statements are true?
a. At Vi = 0.4V, transistor is in active state.
b. At Vi = 1V , it can be used as an amplifier.
c. At Vi = 0. .5V, it can be used as a switch turned off.
d. At Vi = 2.5V, it can be used as a switch turned on.
Choose the correct option:
1. (b), (c), (d)
2. (b), (d)
3. (a), (d)
4. (b), (c)
a. At Vi = 0.4V, transistor is in active state.
b. At Vi = 1V , it can be used as an amplifier.
c. At Vi = 0. .5V, it can be used as a switch turned off.
d. At Vi = 2.5V, it can be used as a switch turned on.
Choose the correct option:
1. (b), (c), (d)
2. (b), (d)
3. (a), (d)
4. (b), (c)
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Level 3: 35%-60%
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In a npn transistor circuit, the collector current is 10mA. If 95 per cent of the electrons emitted reach the collector, which of the following statements are true?
a. The emitter current will be 8 mA.
b. The emitter current will be 10.53 mA.
c. The base current will be 0.53 mA.
d. The base current will be 2 mA.
Choose the correct option:
1. (a), (b), (c)
2. (b), (d)
3. (a), (d)
4. (b), (c)
a. The emitter current will be 8 mA.
b. The emitter current will be 10.53 mA.
c. The base current will be 0.53 mA.
d. The base current will be 2 mA.
Choose the correct option:
1. (a), (b), (c)
2. (b), (d)
3. (a), (d)
4. (b), (c)
Level 3: 35%-60%
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In the depletion region of a diode:
Choose the correct option from the given ones:
| (a) | There are no mobile charges. |
| (b) | An equal number of holes and electrons exist, making the region neutral. |
| (c) | Recombination of holes and electrons has taken place. |
| (d) | Immobile charged ions exist. |
Choose the correct option from the given ones:
| 1. | (a), (c), (d) | 2. | (b), (d) |
| 3. | (a), (d) | 4. | (b), (c) |
Subtopic: Â Energy Band theory |
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Level 2: 60%+
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The conductivity of a semiconductor increases with increase in temperature because
1. number density of free current carriers increases.
2. relaxation time increases.
3. both number density of carriers and relaxation time increase.
4. number density of current carriers increases, relaxation time decreases but effect of decrease in relaxation time is much less than increase in number density.
1. number density of free current carriers increases.
2. relaxation time increases.
3. both number density of carriers and relaxation time increase.
4. number density of current carriers increases, relaxation time decreases but effect of decrease in relaxation time is much less than increase in number density.
Subtopic: Â Types of Semiconductors |
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The breakdown in a reverse-biased \(\mathrm{p\text-n}\) junction is more likely to occur due to:
| (a) | the large velocity of the minority charge carriers if the doping concentration is small. |
| (b) | the large velocity of the minority charge carriers if the doping concentration is large. |
| (c) | strong electric field in a depletion region if the doping concentration is small. |
| (d) | strong electric field in the depletion region if the doping concentration is large. |
Choose the correct option:
1. (a), (d)
2. (b), (d)
3. (c), (d)
4. (b), (c)
Subtopic: Â PN junction |
Level 3: 35%-60%
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To reduce the ripples in rectifier circuit with capacitor filter:
| (a) | \(R_L\) should be increased |
| (b) | input frequency should be decreased |
| (c) | input frequency should be increased |
| (d) | capacitors with high capacitance should be used |
Choose the correct option:
| 1. | (a), (c) | 2. | (b), (d) |
| 3. | (a), (c), (d) | 4. | (b), (c), (d) |
Subtopic: Â Applications of PN junction |
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Level 2: 60%+
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What happens during the regulation action of a Zener diode?
| a. | the current and voltage across the Zener remain fixed. |
| b. | the current through the series Resistance \((R_s)\) changes. |
| c. | the Zener resistance is constant. |
| d. | the resistance offered by the Zener changes. |
Choose the correct option:
| 1. | (a, b) | 2. | (b, d) |
| 3. | (b, c) | 4. | (c, d) |
Subtopic: Â Applications of PN junction |
 54%
Level 3: 35%-60%
Hints
In the depletion region of a diode:
Choose the correct option from the given ones:
| (a) | There are no mobile charges. |
| (b) | An equal number of holes and electrons exist, making the region neutral. |
| (c) | Recombination of holes and electrons has taken place. |
| (d) | Immobile charged ions exist. |
Choose the correct option from the given ones:
| 1. | (a), (c), (d) | 2. | (b), (d) |
| 3. | (a), (d) | 4. | (b), (c) |
Subtopic: Â PN junction |
Level 4: Below 35%
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