| 1. | Choose proper substitutes for X and Y to make the following statement correct. Tunnel diode and Avalanche diode are operated in X bias and Y bias respectively ? | |
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X: forward, Y: reverse
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X: reverse, Y: reverse
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X: reverse, Y: forward
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X: forward, Y: forward
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Report Question| 2. | Which of the following is NOT associated with a p-n junction ? | |
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Charge Storage Capacitance
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Channel Length Modulation
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Depletion Capacitance
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Junction Capacitance
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| 3. | The doping concentration on the n-side of a p-a junction diode is enhanced. Which one of the following will get affected ? | |
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No change in width of depletion regions
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Width of the depletion region on n-side
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Width of the depletion region on both sides
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Width of the depletion region on p-side
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| 4. | In a step-graded p-n junction diode, what is the ratio of depletion region penetration depths into p and n regions (if the ratio of acceptor to donor impurity atoms densities is 1:2) ? | |
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4:1
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1:2
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2:1
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1:4
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| 5. | Which one of the following statements is correct, A tunnel diode is always biased ? | |
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in the reverse direction
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in the positive resistance region nearest to zero
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by a dc source
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in the middle of its negative resistance region
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| 6. | A PIN diode is ? | |
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often used as a microwave oscillator
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a microwave mixer diode
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suitable to use as a microwave switch
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a metal semiconductor point contact diode
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| 7. | Schottky barrier diode can be used as ? | |
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low lever detector
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power supply rectifier
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variable capacitance device
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low noise amplifier
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| 8. | The impurity commonly used for realizing the base region of a silicon n-p-n transistor is ? | |
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Phosphorus
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Gallium
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Indium
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Boron
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| 9. | In a junction transistor, the collector cut-off current lo reduces considerably by doping the ? | |
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emitter with low level of impurity
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collector with low level of impurity
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emitter with high level of impurity
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collector with high level of impurity
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| 10. | If a transistor is operating with both of its junctions forward biased, but with the collector base forward bias greater than the emitter base forward bias, then it is operating in the ? | |
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reverse active mode
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forward saturation mode
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reverse saturation mode
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forward active mode
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