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 Vx =0v?
(Where Vx –> inverting input terminal of differential amplifier with one op-amp)
A. Vo = -(1+R F/R1)*V1
B. Vo = -(1- R F/ R1)*V1
C. Vo = (1+ R F/ R1)*V1
D. Vo = (R F/ R1)*V1
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 Vx and RF value. Assume that the circuit is initially nulled.
A. Vx = -8v, RF = 9.9kΩ
B. Vx = 8v, RF = 9.9kΩ
C. Vx = -8v, RF = -9.9kΩ
D. Vx = 8v, RF = -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 R1 = R2=100Ω and RF = R3 =5kΩ.
A. RIFx = 110Ω; RIFy = 6.7kΩ
B. RIFx = 100Ω; RIFy = 5.1kΩ
C. RIFx = 150Ω; RIFy = 7.2kΩ
D. RIFx = 190Ω; RIFy = 9.0kΩ
10. What is the net output voltage for a differential amplifier with one op-amp
A. Vo = -(RF /R1)*Vx
B. Vo = -(RF /R1)*(Vx -Vy)
C. Vo = (1+RF /R1)*(Vx -Vy)
D. None of the mentioned