For faster action which transistor is used and why?

2

(a)

A germanium diode is preferred to a silicon one for rectifying small voltages. Explain why?

2

(a)

Express by a truth table the output Y for all possible inputs A and B in the circuit shown below 

2

(a)

Write the Boolean equation and truth table for the circuit shown below.What is the output when all the inputs are high?

2

(a)

Construct AND gate using NAND GATE and give its truth table

2

(a)