question_answer

.The Zener diode normally operates under reverse bias condition, the major use of this fact is in the applications where, we require

A)  large value of current

B)  a constant voltage

C)  a current that is increasing without any change in applied voltage

D)  All of the above

Correct Answer: B

Solution :

 The circuit used for working Zener diode is as shown. Once the diode attains the breakdown voltage, there is no change in voltage across the diode even if we change the current in circuit by changing the position of rheostat and that's why the voltage across Zener diode is constant.