Question

What is true about the breakdown voltage in a zener diode?
A. It decreases when current increases
B. It destroy the diode
C. It equal the current time the resistance
D. It was approximately constant

Answer 1

Hint : A Zener diode is a special purpose diode with high doping. The large amount of doping causes the high magnitude of breakdown voltage. It is used as a voltage regulator.

Complete step by step solution:
A Zener diode is a special type of diode designed to reliably allow current to flow backwards. When a certain set reverse voltage known as the Zener voltage is reached in Zener diodes are manufactured with a great variety.
Some low Zener diodes have a sharp highly doped p-n junction with a low Zener voltage in which case the reverse conduction occurs due to electrons. Quantum tunnelling in short space between p and n regions is known as Zener effect after clearance Zener.
As the current in the zener diode increases the voltage across, the diode remains constant.
This voltage will be equal to the zener diode breakdown voltage.

Thus, option D is the correct answer.

Additional information:
Diodes with a higher zener voltage have a more gradual junction and their mode of operation also involves avalanche breakdown. Both breakdown types are present in the zener diodes with the zener effect predominating at the lower voltages and avalanche breakdown at high voltages.
Zener diode is widely used in electronic equipment of all kinds and is one of the basic building blocks of electronic circuits. They are used to generate low power stabilized supplies from a higher voltage and to provide reference voltage for the circuit, especially stabilized power supply. They are also used to protect circuits from over voltage especially electronic discharge.
Zener diodes are widely used as the voltage reference and as the shunt regulator to regulate the voltage across small circuits.

Note:
By using zener voltage theory the breakdown voltage in a zener diode is approximately constant.