Semiconductor Electronics

Identify the logic gate given in the circuit : [figure]

1. OR gate
2. NAND gate
3. NOR gate
4. AND gate

In the given circuit if the power rating of Zener diode is 10 mW, the value of series resistance Rs to regulate the input unregulated supply is : [figure]

1. 10 k
2. 10
3. 1 k
4. 37 k < Rs < 35 k

Conductivity of a photodiode starts changing only if the wavelength of incident light is less than 660 nm. The band gap of photodiode is found to be ( X8 )eV. The value of X is : (Given, h=6.6 10-34 Js, e=1.6 10-19 C)

1. 11
2. 13
3. 15
4. 21

Identify the logic operation performed by the given circuit. [figure]

1. AND
2. NOR
3. OR
4. NAND

[figure] The output of the given circuit diagram is -

1. [figure]
2. [figure]
3. [figure]
4. [figure]

A Zener diode of breakdown voltage 10 V is used as a voltage regulator as shown in the figure. The current through the Zener diode is : [figure]

1. 0
2. 30 mA
3. 20 mA
4. 50 mA

[figure] In the given circuit, the voltage across load resistance (RL) is :

1. 8.75 V
2. 9.00 V
3. 8.50 V
4. 14.00 V

In the given circuit, the breakdown voltage of the Zener diode is 3.0 V. What is the value of Iz ? [figure]

1. 3.3 mA
2. 10 mA
3. 5.5 mA
4. 7 mA

The truth table for this given circuit is : [figure]

1. [figure]
2. [figure]
3. [figure]
4. [figure]

Which of the following circuits is reverse - biased?

1. [figure]
2. [figure]
3. [figure]
4. [figure]