Semiconductor Electronics

The acceptor level of a p-type semiconductor is 6 eV. The maximum wavelength of light which can create a hole would be : Given hc = 1242 eV nm.

1. 407 nm
2. 103.5 nm
3. 414 nm
4. 207 nm

Following gates section is connected in a complete suitable circuit. [figure] For which of the following combination, bulb will glow (ON) :

1. A = 1, B = 1, C = 1, D = 0
2. A = 1, B = 0, C = 0, D = 0
3. A = 0, B = 0, C = 0, D = 1
4. A = 0, B = 1, C = 1, D = 1

The output (Y) of logic circuit given below is 0 only when : [figure]

1. A = 0, B = 0
2. A = 0, B = 1
3. A = 1, B = 0
4. A = 1, B = 1

The value of net resistance of the network as shown in the given figure is : [figure]

1. ( 3011 )
2. 6
3. ( 52 )
4. ( 154 )

Which of the diode circuits shows correct biasing used for the measurement of dynamic resistance of p-n junction diode :

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

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]