question_answer

Ge and Si diodes start conducting at 0.3 V and 0.7 V respectively. In the following figure if Ge diode connection are reversed, the value of  changes by: (assume that the Ge diode has large breakdown voltage)

[JEE Main 09-Jan-2019 Evening]

A) 0.4 V 

B) 0.6 V

C) 0.8 V

D) 0.2 V

Correct Answer: A

Solution :

[a]

Initial output

When Ge is reversed only Si diode will work

Output voltage

Change in output voltage