Semiconductor Electronics

In the circuit shown in the figure, the input voltage Vi is 20 V, VBE = 0 and VCE = 0. The values of IB, IC and β are given by [figure]

1. IB = 40 , IC = 10 mA, β = 250
2. IB = 25 , IC = 5 mA, β = 200
3. IB = 20 , IC = 5 mA, β = 250
4. IB = 40 , IC = 5 mA, β = 125

The given electrical network is equivalent to [figure]

1. OR gate
2. NOR gate
3. NOT gate
4. AND gate

Which one of the following represents forward bias diode ?

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

In a common emitter transistor amplifier the audio signal voltage across the collector is 3 V. The resistance of collector is 3 k . If current gain is 100 and the base resistance is 2 k , the voltage and power gain of the amplifier is

1. 15 and 200
2. 150 and 15000
3. 20 and 2000
4. 200 and 1000

To get output 1 for the following circuit, the correct choice for the input is [figure]

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

Consider the junction diode as ideal. The value of current flowing through AB is [figure]

1. 10-1 A
2. 10-3 A
3. 0 A
4. 10-2 A

A npn transistor is connected in common emitter configuration in a given amplifier. A load resistance of 800 is connected in the collector circuit and the voltage drop across it is 0.8 V. If the current amplification factor is 0.96 and the input resistance of the circuit is 192 , the voltage gain and the power gain of the amplifier will respectively be

1. 4, 4
2. 4, 3.69
3. 4, 3.84
4. 3.69, 3.84

The given circuit has two ideal diodes connected as shown in the figure. The current flowing through the resistance R1 will be [figure]

1. 2.5 A
2. 10.0 A
3. 1.43 A
4. 3.13 A

What is the output Y in the following circuit, when all the three inputs A, B, C are first 0 and then 1? [figure]

1. 0, 1
2. 0, 0
3. 1, 0
4. 1, 1

For CE transistor amplifier, the audio signal voltage across the collector resistance of 2 k is 4 V. If the current amplification factor of the transistor is 100 and the base resistance is 1 k , then the input signal voltage is

1. 10 mV
2. 20 mV
3. 30 mV
4. 15 mV