1. .1 Zener diodes are also known as
(A) Breakdown diode
(B) Forward bias diode
(C) Voltage regulators
(D) None of these
2. .2 Which of the following is true about the resistance of a Zener diode?
(A) All of these
(B) It has dynamic resistance
(C) Value is the inverse of the slope of the i-v characteristics
(D) It has an incremental resistance
3. .3 A Zener diode
(A) Has Constant voltage in breakdown region
(B) Is a battery
(C) Has potential barrier of 1 volt
(D) Is forward biased
4. .4 A zener diode has
(A) None of the above
(B) Two PN junctions
(C) Three PN junctions
(D) One PN junction
5. .5 Zener diode is used primarily as
(A) Amplifier
(B) Rectifier
(C) Voltage regulator
(D) Oscillator
6. .6 A zener diode is always connected in
(A) None of the above
(B) Forward
(C) Either reverse or forward
(D) Reverse
7. .7 A zener diode utilizes ___ characteristic for its operation.
(A) Forward
(B) None of the above
(C) Both forward and reverse
(D) Reverse
8. .8 In the breakdown region, a zener diode behaves like a
(A) Constant voltage source
(B) Constant current source
(C) Constant resistance source
(D) None of the above
9. .9 A zener diode is destroyed if it
(A) Is forward biased
(B) Is reverse biased
(C) None of the above
(D) Carries more than rated current
10. .10 A series resistance is connected in the zener circuit to
(A) Properly reverse bias the zener
(B) None of the above
(C) Properly forward bias the zener
(D) Protect the zener
11. .11 The load voltage is constant when the Zener diode is
(A) Reverse biased
(B) Forward biased
(C) Operating in breakdown region
(D) Unbiased
12. .12 If the load resistance decreases in a Zener regulator, the Zener current
(A) Remains constant
(B) Increases
(C) Decreases
(D) None of these
13. .13 If the load resistance decreases in a Zener regulator, the series current
(A) Increases
(B) Decreases
(C) Remains constant
(D) None of these
14. .14 At high frequencies, ordinary diode does not work properly because of
(A) Charge Storage
(B) Reverse biased
(C) Breakdown
(D) Forward biased
15. .15 The doping level of a Zener diode is
(A) Low
(B) Medium
(C) High
(D) None of these
16. .16 A Zener diode when biased correctly
(A) Acts as a fixed resistance
(B) Has a constant voltage across it
(C) Never overheats
(D) Has a constant current passing through it
17. .17 For typical operation, you need to use the reverse biased voltage with
(A) All of these
(B) Varactor Diode
(C) Zener Diode
(D) Photo diode
18. .18 A Zener diode
(A) Has a high forward voltage rating
(B) Has a sharp breakdown at low reverse voltage
(C) Is useful as an amplifier
(D) None of these
19. .19 The capacitance of a varactor diode increases when the reverse voltage across it
(A) Decreases
(B) Increases
(C) Breakdown
(D) None of these
20. .20 A Photodiode is normally
(A) Forward biased
(B) Reverse biased
(C) Neither forward nor reverse biased
(D) Emitting light
21. .21 When the light increases, the reverse current in a photodiode
(A) Decreases
(B) Increases
(C) Is unaffected
(D) None of the above
22. .22 When the light increases, the reverse minority charge carriers current in photodiode
(A) Decreases
(B) Increases
(C) Unaffected
(D) Reverses Direction
23. .23 A photoconductive cell is also known as
(A) Phototransistor
(B) Photo resistor
(C) Both (b) and (c)
(D) Light Dependent Resistor
24. .24 The varactor is usually
(A) Forward-biased
(B) In the breakdown region
(C) Unbiased
(D) Reverse-biased
25. .25 The device associated with voltage-controlled capacitance is
(A) Light Emitting diode
(B) Photodiode
(C) Varactor Diode
(D) Zener Diode