Semiconductor Electronics

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]

The truth table of the given circuit diagram is : [figure]

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