Diodes

Q1. A crystal diode has forward resistance of the order of ……………

1.kΩ

2. Ω

3. MΩ

4. none of the above

Answer : 2

Q2. If the arrow of crystal diode symbol is positive w.r.t. bar, then diode is ………….. biased.

1. forward

2.reverse

3.either forward or reverse

4.none of the above

Answer : 1

Q3. The reverse current in a diode is of the order of ……………….

1.kA

2.mA

3.μA

4.A

Answer : 3

Q4 The d.c. resistance of a crystal diode is ………….. its a.c. resistance

1.the same as

2.more than

3.less than

4.none of the above

Answer : 3

Q5 The PIV rating of a crystal diode is ………….. that of equivalent vacuum diode

1.the same as

2.lower than

3.more than

4.none of the above

Answer :2

Q6. If the doping level of a crystal diode is increased, the breakdown voltage………….

1.remains the same

2.is increased

3.is decreased

4.none of the above

Answer :3

Q6. A crystal diode is a …………… device

1.non-linear

2.bilateral

3.linear

4.none of the above

Answer :1

Q7. When a crystal diode is used as a rectifier, the most important consideration is ………..

1.forward characteristic

2.doping level

3.reverse characteristic

4.PIC rating

Answer :4

Q8. If the doping level in a crystal diode is increased, the width of depletion layer………..

1.remains the same

2.is decreased

3.in increased

4.none of the above

Answer :3

Q9. A zener diode is used as …………….

1.an amplifier

2.a voltage regulator

3.a rectifier

4.a multivibrator

Answer :2

Q10. The doping level in a zener diode is …………… that of a crystal diode 

1.the same as

2.less than

3.more than

4.none of the above

Answer :3

Q11. A zener diode is always ………… connected.

1.reverse

2.forward

3.either reverse or forward

4.none of the above

Answer :1

Q12. A series resistance is connected in the zener circuit to………..

1.properly reverse bias the zener

2.protect the zener

3.properly forward bias the zener

4.none of the above

Answer :2

Q13. A zener diode is …………………. device

1.a non-linear

2.a linear

3.an amplifying

4.none of the above

Answer :1

Q14. A zener diode has ………….. breakdown voltage

1.undefined

2.sharp

3.zero

4.none of the above

Answer :2

Q15. The disadvantage of a half-wave rectifier is that the……………….

1.components are expensive

2.diodes must have a higher power rating

3.output is difficult to filter

4.none of the above

Answer :3

Q16 Cathode of zener diode in a voltage regulator is normally

1.more negative than anode

2.more positive than anode

3.at + 0.7 V

4.grounded

Answer : 2