ECE21M05L01Q1

What is true about the breakdown voltage in a zener diode?

• It decreases when current increases
• It destroys the diode.
• It equals the current times the resistance.
• It is approximately constant.

Which of these is the best description of a zener diode?

• It is a rectifier diode.
• It is a constant-voltage device.
• It is a constant-current device.
• It works in the forward region.

A zener diode

• Is a battery
• Has a constant voltage in the breakdown region
• Has a barrier potential of 1 V
• Is forward biased

The voltage across the zener resistance is usually

• Small
• Large
• Measured in volts
• Subtracted from the breakdown voltage

If the series resistance increases in an unloaded zener regulator, the zener current

• Decreases
• Stays the same
• Increases
• Equals the voltage divided by the resistance

In the second approximation, the total voltage across the zener diode is the sum of the breakdown voltage and the voltage across the

• Source
• Series resistor
• Zener resistance
• Zener diode

The load voltage is approximately constant when a zener diode is

• Forward biased
• Reverse biased
• Operating in the breakdown region
• Unbiased

In a loaded zener regulator, which is the largest current?

• Series current
• Zener current
• Load current
• None of these

If the load resistance increases in a zener regulator, the zener current

• Decreases
• Stays the same
• Increases
• Equals the source voltage divided by the series resistance

If the load resistance decreases in a zener regulator, the series current

• Decreases
• Stays the same
• Increases
• Equals the source voltage divided by the series resistance