Semiconductor Electronics · Question 38

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

In the given figure, a diode D is connected to an external resistance R = 100 Ω and an e.m.f. of 3.5 V. If the barrier potential developed across the diode is 0.5 V, the current in the circuit will be [figure]

1. 20 mA
2. 35 mA
3. 30 mA
4. 40 mA

The input signal given to a CE amplifier having a voltage gain of 150 is Vi = 2 (15t + 3 ). The corresponding output signal will be

1. 2 (15t + 5 6 )
2. 300 (15t + 4 3 )
3. 300 (15t + 3 )
4. 75 (15t + 2 3 )

Which logic gate is represented by the following combination of logic gates? [figure]

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

If in a p-n junction, a square input signal of 10 V is applied, as shown, [figure] then the output across RL will be

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

The given graph represents V-I characteristic for a semiconductor device. [figure] Which of the following statement is correct ?

1. It is V-I characteristic for solar cell where, point A represents open circuit voltage and point B short circuit current.
2. It is for a solar cell and points A and B represent open circuit voltage and current, respectively.
3. It is for a photodiode and points A and B represent open circuit voltage and current, respectively.
4. It is for a LED and points A and B represent open circuit voltage and short circuit current, respectively.

The barrier potential of a p-n junction depends on Which one of the following is correct ?

1. A and B only
2. B only
3. B and C only
4. A, B and C