# Zener Diode MCQ Questions with Answers

Zener Diode MCQ Questions with Answers

## A Zener diode is designed for operation in the

A Zener diode is designed for operation in the:

1. Forward bias region
2. Reverse bias region on right side of knee voltage
3. Reverse-breakdown region
4. None of these

Correct answer: 3. Reverse-breakdown region

## Zener diode can be best defined as

Zener diode can be best defined as:

1. Voltage clipper
2. Voltage clamper
3. Voltage regulator
4. Power diode

Correct answer: 3. Voltage regulator

## To reduce the breakdown voltage a zener diode is

To reduce the breakdown voltage a zener diode is:

1. Lightly doped
2. Moderately doped
3. Heavily doped
4. None of above

Correct answer: 3. Heavily doped

## Zener diodes that are having breakdown voltages of less than 5 V operate predominately in

Zener diodes that are having breakdown voltages of less than 5 V operate predominately in:

1. Avalanche breakdown
2. Zener breakdown region
3. Both of these
4. None of these

Correct answer: 2. Zener breakdown region

## Zener diodes that are having breakdown voltages greater than 5 V operate predominately in

Zener diodes that are having breakdown voltages greater than 5 V operate predominately in:

1. Avalanche breakdown
2. Zener breakdown region
3. Both of these
4. None of these

Correct answer: 1. Avalanche breakdown

## Under normal operations a zener diode maintains

Under normal operations a zener diode maintains

1. Nearly constant voltage across its terminals
2. Pulsating voltage across its terminals

Correct answer: 1. Nearly constant voltage across its terminals

## If IK = Zener knee current and IM = Zener maximum current, then to maintain constant voltage across a Zener diode should operate when it current value is

If IK = Zener knee current and IM = Zener maximum current, then to maintain constant voltage across a Zener diode should operate when it current value is

1. Lesser than IK
2. Lesser than IM, but greater than IK
3. Greater than IK and IM
4. Greater tahan IK and IM both

Correct answer: 2. Lesser than IM, but greater than IK

## The maximum power rating of a zener diode has 500 mW at 50°C and a derating factor of 2.2 mW/°C. The maximum power zener can dissipate at a temperature of 70°C is

The maximum power rating of a zener diode has 500 mW at 50°C and a derating factor of 2.2 mW/°C. The maximum power zener can dissipate at a temperature of 70°C is:

1. 228 mW
2. 456 mW
3. 624 mW
4. 1099 mW

Correct answer: 2. 456 mW

Solution:

PD(derated) = PD(max) – (mW/°C) *ΔT

= 500 mW – (2.2 mW/°C)( 70°C – 50°C)

= 456 mW