In the circuit shown, the value of $$\beta $$ of the transistor is 48. If the supplied base current is 200 $$\mu $$A, what is the voltage at the terminal Y?

In the circuit shown, what will be the current through the 6V zener?

Each of the two inputs A and B can assume values either 0 or 1. Then which of the following will be equal to $$\overline {A\,} $$ . $$\overline {B\,} $$?

In the circuit shown, inputs A and B are in states 1 and 0 respectively. What is the only possible stable state of the outputs X and Y?