TEST NO. 5

MAXIMUM MARKS : 17

1. The following table gives the output of a two input logic gate. (2)

Identify the logic gate and draw its logic symbol

A B Y

0 0 0

1 0 0

0 1 0

1 1 1

2. The output of a 2 input AND gate is fed to a NOT gate. Draw the (2)

Logic circuit of this combination of gates and write its truth table.

3. What is Zener diode? Give its symbol. (2)

4. What is OR gate? Give Boolean expression for it. (2)

5. With the help of circuit diagram, explain how a Zener diode can be (3)

used as voltage regulator.

6. Draw the circuit diagram of a full wave rectifier. Explain its working. (3)

Draw the input / output waveforms indicating clearly the functions of

Two diodes used.

7. Identify the logic gates 1 and 2. The output of these gates are fed to (3)

NOR gate as shown below

.

Name the logic gate so obtained and write its truth table.