1. Why differential amplifiers are preferred for instrumentation and industrial applications?

A. Input resistance is low

B. Produce amplified output

C. Amplify individual input voltage

D. Reject common-mode voltage

2. Which of the following is a combination of inverting and non-inverting amplifiers?

A. Differential amplifier with one op-amp

B. Differential amplifier with two op-amps

C. Differential amplifier with three op-amps

D. Differential amplifier with four op-amps

3. What will be the output voltage when V_{x} =0v?

(Where V_{x} –> inverting input terminal of differential amplifier with one op-amp)

A. V_{o} = -(1+R _{F}/R_{1})*V_{1}

B. V_{o} = -(1- R _{F}/ R_{1})*V_{1}

C. V_{o} = (1+ R _{F}/ R_{1})*V_{1}

D. V_{o} = (R _{F}/ R_{1})*V_{1}

4. Compute the output voltage from the following circuit diagram?

A. -17v

B. -27v

C. -39v

D. -15v

5. Compute the output voltage if the input voltage is reduced to zero in a differential amplifier with one op-amp?

A. Inverted Voltage

B. Same as the input voltage

C. Amplified inverted voltage

D. Cannot be determined

6. The difference between the input and output voltage is -1v and 17v. Calculate the closed-loop voltage gain of differential amplifier with one op-amp?

A. -51

B. 34

C. -17

D. 14

7. For the differential amplifier given below, determine the V_{x} and R_{F} value. Assume that the circuit is initially nulled.

A. V_{x} = -8v, R_{F} = 9.9kΩ

B. V_{x} = 8v, R_{F} = 9.9kΩ

C. V_{x} = -8v, R_{F} = -9.9kΩ

D. V_{x} = 8v, R_{F} = -9.9kΩ

8. The gain of a differential amplifier with one op-amp is the same as that of

A. The inverting amplifier

B. The non-inverting amplifier

C. Both inverting and non-inverting amplifier

D. None of the mentioned

9. Find the value of input resistance for differential amplifier with one op-amp. If R_{1} = R_{2}=100Ω and R_{F} = R_{3} =5kΩ.

A. R_{IFx} = 110Ω; R_{IFy} = 6.7kΩ

B. R_{IFx} = 100Ω; R_{IFy} = 5.1kΩ

C. R_{IFx} = 150Ω; R_{IFy} = 7.2kΩ

D. R_{IFx} = 190Ω; R_{IFy} = 9.0kΩ

10. What is the net output voltage for a differential amplifier with one op-amp

A. V_{o} = -(R_{F} /R_{1})*V_{x}

B. V_{o} = -(R_{F} /R_{1})*(V_{x} -V_{y})

C. V_{o} = (1+R_{F} /R_{1})*(V_{x} -V_{y})

D. None of the mentioned

11. The characteristics of a non-inverting amplifier are identical to

A. Differential Amplifier with one op-amp

B. Differential Amplifier with two op-amp

C. Differential Amplifier with three op-amp

D. None of the mentioned

12. How is it possible to vary the voltage from the closed-loop gain to the open-loop gain?

A. By using a differential amplifier with a larger gain

B. By using a differential amplifier with a small gain

C. By using a differential amplifier with variable gain

D. By using a differential amplifier with differential gain

13. A differential amplifier with two op-amps has the following specifications:

R_{1}=R_{3}=1.5kΩ ; R_{F}=R_{2}=5.7kΩ. Compute the input resistance for the following circuit.

A. R_{IFx} = 83GΩ, R_{IFy} = 317GΩ

B. R_{IFx} = 90GΩ, R_{IFy} = 400GΩ

C. R_{IFx} = 59GΩ, R_{IFy} = 269GΩ

D. R_{IFx} = 36GΩ, R_{IFy} = 156GΩ

14. Determine the output voltage from the diagram. Where V_{1}=-4.3Vpp and V_{2} = -5.1Vpp sinewave at 1000hz.

A. 12 Vpp sinewave at 1000hz

B. 13.3 Vpp sinewave at 1000hz

C. 14 Vpp sinewave at 1000hz

D. 11 Vpp sinewave at 1000hz

15. Determine the output resistance of the differential amplifier with three op-amps. The op-amp used is 741c, with A=200000 and R_{o}. The output and difference of input voltages are 44 and 11.

A. 5.5mΩ

B. 3.5mΩ

C. 2.4mΩ

D. 1.5mΩ

16. Find the input resistance for the given circuit

A. R_{IF} = R_{i}*[1+(A*R_{4}+R_{5})/(2* R_{4}+R_{5})].

B. R_{IF} = R_{i}*[1+(A*R_{4})/(2* R_{4}+R_{5})].

C. R_{IF} = R_{i}*[1+(A*R_{4}+R_{5})/(R_{4}+R_{5})].

D. None of the mentioned

17. The bandwidth of the differential amplifier increases, if the value of

A. Open loop voltage gain decreases

B. Closed-loop voltage gain decreases

C. Differential voltage gain decreases

D. All of the mentioned

18. Calculate the bandwidth for the given circuit. (Where the 741 op-amp has a gain of 200000).

A. 560hz

B. 390khz

C. 25.6khz

D. 1.5Mhz

19. Calculate the output voltage. If V_{x}=3.9Vpp and V_{y} = 5.5 Vpp sinewave at 1khz for the following circuit.

A. 11 Vpp sinewave at 1Khz

B. -8Vpp Vpp sinewave at 1Khz

C. -10 Vpp sinewave at 1Khz

D. 6 Vpp sinewave at 1Khz

20. Miniaturization of components with superior performance can be obtained in

A. Integrated circuits

B. Discrete circuits

C. Both integrated and discrete circuits

D. None of the mentioned