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Electronic Devices and Circuits: Introduction to Electronic Devices
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Electronic Devices and Circuits: Introduction to Electronic Devices
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25 Questions

1. A Zener regulator has to handle supply voltage variation from 19.5V to 22.5V. Find the magnitude of regulating resistance, if the load resistance is 6KΩ. The Zener diode has the following specifications: breakdown voltage =18V, (IZ)Min=2µA, maximum power dissipation=60mW and Zener resistance =20Ω.
2. At room temperature (VT = 26) what will be the approximate value of r when n=1 and I=100mA?
3. The current in the diode is - Unipolar - Bipolar
4. During reverse bias, a small current develops known as
5. If the voltage of the potential barrier is V0. A voltage V is applied to the input, at what moment will the barrier disappear?
6. If the positive terminal of the battery is connected to the anode of the diode, then it is known as
7. If 120 C of charge passes through an electric conductor in 60 sec, the current in the conductor is _________
8. What does Inp represent?
9. Which of these following is not a characteristic of an ideal diode?
10. The zener diode is heavily doped because______
11. The limiting value of the current resistor used in a Zener diode (when used as a regulator)
12. The energy required to move 120 coulomb through 3 V is _________
13. Determine the minimum value of load resistance that can be used in the circuit with (IZ)Min=3mA. The input voltage is 10V and the resistance R is 500Ω. The Zener diode has a VZ=6V 0and (IZ)MAX=90mA.
14. Deep into the p side the current is a drift current Ipp of holes sustained by the small electric field in the semiconductor. Is the statement true or false?
15. Twelve 6 ohm resistors are used to form an edge of a cube. The resistance between two diagonally opposite corner of the cube (in ohm) is ________
16. A transistor series regulator has the following specifications: VIN=15V, VZ=8.3V, β=100, R=1.8KΩ, RL=2KΩ. What will be the Zener current in the regulator circuit?
17. The energy required to charge a 10 µF capacitor to 100 V is ________
18. The number of injected minority carriers falls off linearly with the increase in the distance from the junction. Is it true or false?
19. What will be the approximate value of thermal voltage of diode?
20. When is a regulator used?
21. In piecewise linear characteristics what will be the RF value if the slope is 0.5?
22. When the diode is reverse biased with a voltage of 6V and Vbi=0.63V. Calculate the total potential.
23. In the diode volt ampere characteristics what will be the resistance if a slope is drawn between the voltages 50 to 100 and corresponding current 5 to 10?
24. A diode will behave as an open circuit if the voltage in the circuit is less than __________
25. When a forward biased is applied to a diode, the electrons enter to which region of the diode?

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