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 \[{{V}_{0}}\] changes by: (assume that the Ge diode has large breakdown voltage)   [JEE Main Online Paper (Held On 09-Jan-2019 Evening]

A) 0.4 V

B)                                       0.6 V

C) 0.8 V             

D)               0.2 V

Correct Answer: A

Solution :

  Initial output \[{{V}_{0}}=12-0.3\] \[=11.7\text{ }Volt\] When Ge is reversed only Si diode will work   Output voltage \[=\,\,\,12-0.7=11.3\text{ }V\] Change in output voltage \[=11.7-11.3\] \[=\text{ }0.4\text{ }volt\]