1. In the BJT amplifier shown in figure, the transistor is based in the forward active region. Putting a capacitor across R

a. Decrease the voltage gain and decrease the input impedance

b. Increase the voltage gain and decrease the input impedance

c. decrease the voltage gain and increase the input impedance

d. Increase the voltage gain and increase the input impedance

Solution:
https://www.youtube.com/watch?v=dyVSC2Y1uGI

2. A cascode amplifier stage is equivalent to

a. A common emitter stage followed by a common base stage

b. A common base stage followed by an emitter follower

c. An emitter follower stage followed by a common base stage

d. A common base stage followed by a common emitter stage

Solution:
https://www.youtube.com/watch?v=SPCOV6Ty37Y

3. The output voltage V

a. – 4 volts

b. 6 volts

c. 5 volts

d. – 5.5 volts

Solution:
https://www.youtube.com/watch?v=Pm1HOcvc9Og

4. A half wave rectifier uses a diode with a forward resistance R

Solution:
https://www.youtube.com/watch?v=boqmSFp0yRQ

5. Negative feedback in

1. Voltage Series configuration

2. Current Shunt configuration

a. Increases input impedance

b. Decreases input impedance

c. Increases closed loop gain

d. leads to oscillation

6. The transistor in the circuit shown is so biased (dc biasing network is not shown) that the dc collector current, I

Evaluate small signal voltage gain A

a. C

b. The bypass capacitor C

7. Consider the circuit given in the figure is using an ideal operational amplifier. The characteristics of the diode are given by the relation I = I

a. Express V

b. If R = 100 kΩ, I

8. In circuit shown, assume that the operational amplifier is ideal and that V

a. Calculate the charge transferred per second from node A to node B.

b. Derive the average rate of change of the output voltage V

c. If the capacitor and the switch are removed and a resistor is connected between points A and B, find the value of the resistor to get the same average rate of change of the output voltage?

d. If the repetition rate of the switching action is 10

9. An IC 555 chip has been used to construct a pulse generator. Typical pin connections with components are shown below. It is desired to generate a square pulse of 10 kHz.

Evaluate values of R

_{E}willa. Decrease the voltage gain and decrease the input impedance

b. Increase the voltage gain and decrease the input impedance

c. decrease the voltage gain and increase the input impedance

d. Increase the voltage gain and increase the input impedance

2. A cascode amplifier stage is equivalent to

a. A common emitter stage followed by a common base stage

b. A common base stage followed by an emitter follower

c. An emitter follower stage followed by a common base stage

d. A common base stage followed by a common emitter stage

3. The output voltage V

_{o}of the circuit shown isa. – 4 volts

b. 6 volts

c. 5 volts

d. – 5.5 volts

4. A half wave rectifier uses a diode with a forward resistance R

_{f}. The voltage is V_{m}sinωt and the load resistance is R_{L}. The DC current is given by5. Negative feedback in

1. Voltage Series configuration

2. Current Shunt configuration

a. Increases input impedance

b. Decreases input impedance

c. Increases closed loop gain

d. leads to oscillation

**Solution:**6. The transistor in the circuit shown is so biased (dc biasing network is not shown) that the dc collector current, I

_{C}= 1 mA and V_{CC}= 5 volts. The network components have following values: R_{C}= 2 kΩ, R_{S}= 1.4 kΩ and R_{E}= 100 Ω. The transistor has β = 100 and a base spreading resistance, r_{bb}’ = 100Ω. Assume V_{T}= 25 mV.Evaluate small signal voltage gain A

_{VS}at a frequency of 10 kHz, and input resistance R_{i}for two cases:a. C

_{E}, the bypass capacitor across R_{E}is 25 µFb. The bypass capacitor C

_{E}is removed leaving RE unbypassed**Solution:****https://www.youtube.com/watch?v=RoUrqP0JRF4**7. Consider the circuit given in the figure is using an ideal operational amplifier. The characteristics of the diode are given by the relation I = I

_{S}(e^{qV/KT}– 1), where V is the forward voltage across the diode.a. Express V

_{o}as function of V_{i}, assuming V_{i}> 0b. If R = 100 kΩ, I

_{S}= 1 µA and V_{T}= 25 mV, find the input voltage V_{i}for which V_{o}= 0.**Solution:****https://www.youtube.com/watch?v=uuBa60badBA**8. In circuit shown, assume that the operational amplifier is ideal and that V

_{o}= 0 volts initially. The switch is connected first to ‘A’ charging C_{1}to the voltage V. it is then connected to the point ‘B’. This process is repeated 'f' times per second.a. Calculate the charge transferred per second from node A to node B.

b. Derive the average rate of change of the output voltage V

_{o}.c. If the capacitor and the switch are removed and a resistor is connected between points A and B, find the value of the resistor to get the same average rate of change of the output voltage?

d. If the repetition rate of the switching action is 10

^{4}times per second, C_{1}= 100pF, C_{2}= 10pF and V= 10 mV. What is the average change of the output voltage?**Solution:****https://www.youtube.com/watch?v=5lfnNxFBP8M**9. An IC 555 chip has been used to construct a pulse generator. Typical pin connections with components are shown below. It is desired to generate a square pulse of 10 kHz.

Evaluate values of R

_{A}and R_{B}if the capacitor C has the value of 0.01 µF for the configuration chosen. If necessary you can suggest modification in the external configuration.**Solution:****https://www.youtube.com/watch?v=kDhOOwDVZPo**
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