1. In the differential amplifier of the figure, if the source resistance of the current source I

a. Zero

b. Infinite

c. Indeterminate

d. (V

Solution: https://www.youtube.com/watch?v=goC-ZRrr_Yw

2. In the circuit shown in figure, the output voltage V

a. – 1 volts

b. 2 volts

c. + 1 volts

d. + 15 volts

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

3. Introducing a resistor in the emitter of a CE amplifier stabilizes the dc operating point against variations in

a. Only the temperature

b. Only the β of the transistor

c. Both temperature and β

d. None of the above

Solution: https://www.youtube.com/watch?v=Hj4RgZDwBwk

4. The current gain of a bipolar transistor drops at high frequencies because of

a. Transistor capacitances

b. High current effects in the base

c. Parasitic inductance effects

d. The Early Effect

Solution: https://www.youtube.com/watch?v=mZE9xTPfxjs

5. If the OP-AMP in the figure is ideal, then the output voltage V

a. Zero

b. (V

c. – (V

d. (V

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

6. The configuration of the figure is a

a. Precision rectifier

b. Hartley oscillator

c. Butterworth high pass filter

d. Wien-bridge oscillator

Solution: https://www.youtube.com/watch?v=PxZImxr0h6Q

7. Assume that the OP-AMP of the figure is ideal. If V

a. Square wave

b. Triangular wave

c. Parabolic wave

d. Sine wave

Solution: https://www.youtube.com/watch?v=ZvsEb1Tpxaw

8. The most commonly used amplifier in Sample and Hold circuits is

a. Unity gain inverting amplifier

b. Unity gain non-inverting amplifier

c. An inverting amplifier with a gain of 10

d. An inverting amplifier with a gain of 100

Solution: https://www.youtube.com/watch?v=JFfOcIr8x7U

9. If the OP-AMP in the figure has an input offset voltage of 5 mV and an open loop voltage gain of 10,000. Then the output V

a. 0 volts

b. 5 mV

c. + 15 volts or – 15 volts

d. + 50 volts or – 50 volts

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

10. a. For the circuit shown, plot V

b. Design a circuit using two ideal diodes, one resistor and two voltage sources that would convert the input voltage to the output voltage as shown in figure. The resistor value need not be specified.

11. For the amplifier circuit shown, I

a. What is the small signal voltage gain, V

b. What is the approximate voltage gain if C

c. What will be the output Vo, if C

12. For a feedback amplifier, the open loop transfer function has three poles at 100 k rad/sec, 1 M rad/sec and 10 M rad/sec. The low frequency open loop gain is 1000 and the feedback factor (β) is 1. Use Bode plots to determine the phase margin of the amplifier. Is the amplifier stable?

13. Below figure shown is a common base amplifier.

a. Write expressions for the time constants associated with the capacitances C

b. What is the approximate lower cutoff frequency of the amplifier?

_{EE}is infinite, then the common mode gain isa. Zero

b. Infinite

c. Indeterminate

d. (V

_{in1}+ V_{in2}) / 2V_{T}2. In the circuit shown in figure, the output voltage V

_{o}isa. – 1 volts

b. 2 volts

c. + 1 volts

d. + 15 volts

3. Introducing a resistor in the emitter of a CE amplifier stabilizes the dc operating point against variations in

a. Only the temperature

b. Only the β of the transistor

c. Both temperature and β

d. None of the above

4. The current gain of a bipolar transistor drops at high frequencies because of

a. Transistor capacitances

b. High current effects in the base

c. Parasitic inductance effects

d. The Early Effect

5. If the OP-AMP in the figure is ideal, then the output voltage V

_{o}isa. Zero

b. (V

_{1}– V_{2}) sinωtc. – (V

_{1}+ V_{2}) sinωtd. (V

_{1}+ V_{2}) sinωt6. The configuration of the figure is a

a. Precision rectifier

b. Hartley oscillator

c. Butterworth high pass filter

d. Wien-bridge oscillator

7. Assume that the OP-AMP of the figure is ideal. If V

_{i}is a triangular wave, then V_{o}will bea. Square wave

b. Triangular wave

c. Parabolic wave

d. Sine wave

8. The most commonly used amplifier in Sample and Hold circuits is

a. Unity gain inverting amplifier

b. Unity gain non-inverting amplifier

c. An inverting amplifier with a gain of 10

d. An inverting amplifier with a gain of 100

9. If the OP-AMP in the figure has an input offset voltage of 5 mV and an open loop voltage gain of 10,000. Then the output V

_{o}will bea. 0 volts

b. 5 mV

c. + 15 volts or – 15 volts

d. + 50 volts or – 50 volts

10. a. For the circuit shown, plot V

_{o}under steady state conditions, with and without capacitor C. Assume that the diode is ideal.**Solution:****https://www.youtube.com/watch?v=GJXs26_62eE**b. Design a circuit using two ideal diodes, one resistor and two voltage sources that would convert the input voltage to the output voltage as shown in figure. The resistor value need not be specified.

**Solution:****https://www.youtube.com/watch?v=gXD0ms6S8iY**11. For the amplifier circuit shown, I

_{C}= 1.3 mA, R_{C}= 2 kΩ, R_{E}= 500 Ω, V_{T}= 26 mV, β = 100, V_{CC}= 15 volts, V_{S}= 0.01 sin(ωt) volts and C_{b}= C_{e}= 10 µF.a. What is the small signal voltage gain, V

_{o}/V_{S}b. What is the approximate voltage gain if C

_{e}is removed?c. What will be the output Vo, if C

_{b}is short circuited?**Solution:****https://www.youtube.com/watch?v=x75WPMXrTOg**12. For a feedback amplifier, the open loop transfer function has three poles at 100 k rad/sec, 1 M rad/sec and 10 M rad/sec. The low frequency open loop gain is 1000 and the feedback factor (β) is 1. Use Bode plots to determine the phase margin of the amplifier. Is the amplifier stable?

**Solution:**Amplifier is**Unstable.**13. Below figure shown is a common base amplifier.

a. Write expressions for the time constants associated with the capacitances C

_{b}and C_{s}.b. What is the approximate lower cutoff frequency of the amplifier?

**Solution:****https://www.youtube.com/watch?v=wTtlORiy598**