# Differential Amplifiers with Multiple Op-Amp – 1 MCQ’s

This set of Linear Integrated Circuits Multiple Choice Questions & Answers (MCQs) focuses on “Differential Amplifiers with Multiple Op-Amp – 1″.

1. Which of the following is a combination of inverting and non-inverting amplifier?

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

2. 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}

3. 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

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

a) -17v

b) -27v

c) -39v

d) -15v

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

a) -51

b) 34

c) -17

d) 14

6. The gain of differential amplifier with one op-amp is 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

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

a) Inverted Voltage

b) Same as the input voltage

c) Amplified inverted voltage

d) Cannot be determined

8. 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

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 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

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