Virtual Labs

IV characteristics of a PN junction diode

11. What is the primary cause of the forward voltage drop in a PN junction diode?

a: Recombination of electrons and holes Explanation

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b: Thermal generation Explanation

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c: Electric field Explanation

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d: Minority carrier injection Explanation

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12. What happens to the depletion region when a PN junction diode is forward biased?

a: It widens Explanation

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b: It narrows Explanation

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c: It remains unchanged Explanation

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d: It disappears Explanation

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13. What is the effect of increasing the forward current on the voltage drop across a PN junction diode?

a: The voltage drop decreases Explanation

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b: The voltage drop increases Explanation

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c: The voltage drop remains constant Explanation

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d: The voltage drop becomes negative Explanation

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14. What type of breakdown occurs in a heavily doped PN junction diode at a relatively low reverse voltage?

a: Zener breakdown Explanation

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b: Avalanche breakdown Explanation

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c: Thermal breakdown Explanation

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d: Tunneling breakdown Explanation

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15. What is the primary mechanism of current flow in a PN junction diode under reverse bias?

a: Majority carrier diffusion Explanation

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b: Minority carrier drift Explanation

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c: Thermal conduction Explanation

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d: Photon emission Explanation

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16. What parameter is used to describe the sharpness of the knee of the IV curve in a PN junction diode?

a: Ideality factor Explanation

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b: Saturation current Explanation

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c: Series resistance Explanation

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d: Knee voltage Explanation

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17. Which of the following factors can influence the IV characteristics of a PN junction diode?

a: Temperature Explanation

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b: Doping concentration Explanation

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c: Material properties Explanation

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d: All of the above Explanation

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18. At what voltage does a silicon diode typically enter breakdown in the reverse bias?

a: Around 0.7V Explanation

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b: Around 1.1V Explanation

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c: Around 5V Explanation

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d: Greater than 20V Explanation

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19. What is the typical behavior of a PN junction diode in the reverse saturation region?

a: Current increases exponentially Explanation

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b: Current remains very low and nearly constant Explanation

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c: Current increases linearly Explanation

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d: Current fluctuates unpredictably Explanation

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20. In the IV characteristics curve of a PN junction diode, what does the slope of the curve in the forward bias region represent?

a: Current gain Explanation

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b: Dynamic resistance Explanation

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c: Static resistance Explanation

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d: Breakdown voltage Explanation

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