Chapter 3 SPECIAL DIODES MCQs 25 min Score: 0 Attempted: 0/25 Subscribe 1. .1 Zener diodes are also known as (A) Breakdown diode (B) Forward bias diode (C) Voltage regulators (D) None of theseShow All Answers 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 resistanceShow All Answers 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 biasedShow All Answers 4. .4 A zener diode has (A) None of the above (B) Two PN junctions (C) Three PN junctions (D) One PN junctionShow All Answers 5. .5 Zener diode is used primarily as (A) Amplifier (B) Rectifier (C) Voltage regulator (D) OscillatorShow All Answers 6. .6 A zener diode is always connected in (A) None of the above (B) Forward (C) Either reverse or forward (D) ReverseShow All Answers 7. .7 A zener diode utilizes ___ characteristic for its operation. (A) Forward (B) None of the above (C) Both forward and reverse (D) ReverseShow All Answers 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 aboveShow All Answers 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 currentShow All Answers 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 zenerShow All Answers 11. .11 The load voltage is constant when the Zener diode is (A) Reverse biased (B) Forward biased (C) Operating in breakdown region (D) UnbiasedShow All Answers 12. .12 If the load resistance decreases in a Zener regulator, the Zener current (A) Remains constant (B) Increases (C) Decreases (D) None of theseShow All Answers 13. .13 If the load resistance decreases in a Zener regulator, the series current (A) Increases (B) Decreases (C) Remains constant (D) None of theseShow All Answers 14. .14 At high frequencies, ordinary diode does not work properly because of (A) Charge Storage (B) Reverse biased (C) Breakdown (D) Forward biasedShow All Answers 15. .15 The doping level of a Zener diode is (A) Low (B) Medium (C) High (D) None of theseShow All Answers 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 itShow All Answers 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 diodeShow All Answers 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 theseShow All Answers 19. .19 The capacitance of a varactor diode increases when the reverse voltage across it (A) Decreases (B) Increases (C) Breakdown (D) None of theseShow All Answers 20. .20 A Photodiode is normally (A) Forward biased (B) Reverse biased (C) Neither forward nor reverse biased (D) Emitting lightShow All Answers 21. .21 When the light increases, the reverse current in a photodiode (A) Decreases (B) Increases (C) Is unaffected (D) None of the aboveShow All Answers 22. .22 When the light increases, the reverse minority charge carriers current in photodiode (A) Decreases (B) Increases (C) Unaffected (D) Reverses DirectionShow All Answers 23. .23 A photoconductive cell is also known as (A) Phototransistor (B) Photo resistor (C) Both (b) and (c) (D) Light Dependent ResistorShow All Answers 24. .24 The varactor is usually (A) Forward-biased (B) In the breakdown region (C) Unbiased (D) Reverse-biasedShow All Answers 25. .25 The device associated with voltage-controlled capacitance is (A) Light Emitting diode (B) Photodiode (C) Varactor Diode (D) Zener DiodeShow All Answers
