# The Inverting Configuration MCQ’s

This set of Electronic Devices & Circuits Multiple Choice Questions & Answers (MCQs) focuses on “The Inverting Configuration”.

1. The effect of the inverting configuration is
a) The output signal and the input signal are out of phase by 180o
b) The output signal and the input signal are in phase
c) The output phase is leading the input phase by 90o
d) The output phase is lagging behind the input phase by 90o

2. For an ideal negative feedback configuration which of the following is true?
a) There is a virtual open circuit between the input terminals
b) The closed loop gain for a negative feedback does not depend only on the external parameters
c) There is a virtual short circuit between the input terminals
d) There is a virtual ground at the negative input terminal

3. When does a resistance provide a negative feedback to an amplifier?
a) Resistance is connected between the positive input terminal and the output terminal
b) Resistance is connected between the negative input terminal and the output terminal
c) Resistance is connected between the input terminals
d) Resistance is connected between the negative input terminal and ground

4. The negative feedback causes
a) The voltage between the two input terminals to the very small, ideally zero
b) The voltage between the two input resistance very high, ideally infinite
c) Current flow through the positive input terminal and no current flows through the negative input terminal
d) Both a and c

5. The advantage of a weighted summer operational amplifier is
a) It is capable of summing various input voltages together
b) Each input signal may be independently adjusted by adjusting the corresponding input resistance
c) If one needs both sign of a voltage signal then two operational amplifiers are needed
d) All of the mentioned

6. You are provided with an ideal op amp and three 10kΩ resistors. Using series and parallel resistor combinations, how many different inverting-amplifier circuit topologies are possible?
a) 2
b) 3
c) 4
d) 5

7. The non-inverting closed loop configuration features a high resistance. Therefore in many cases unity gain follower called buffer amplifier is often used to
a) Connect a high resistance source to high resistance load
b) Connect low resistance source to low resistance load
c) Connect low resistance source to a high resistance source
d) Connect high resistance source to a low resistance load

8. The following is a circuit of weighted summer capable of summing coefficients of both sign. The expressions for the output voltage v0 is

a) v0 = v1 (R1/Ra ) (Rc/Rb ) + v1 (Ra/R2 ) (Rc/Rb ) – v1 (Rc/R3 ) – v1 (Rc/R4 )
b) v0 = – v1 (R1/Ra ) (Rc/Rb ) – v1 (Ra/R2 ) (Rc/Rb ) + v1 (Rc/R3 ) + v1 (Rc/R4 )
c) v0 = v1 (Ra/R1 ) (Rc/Rb ) + v1 (Ra/R2 ) (Rc/Rb ) – v1 (Rc/R3 ) – v1 (Rc/R4 )
d) v0 = – v1 (Ra/R1 ) (Rc/Rb ) – v1 (Ra/R2 ) (Rc/Rb ) + v1 (Rc/R3 ) + v1 (Rc/R4 )

9. The loop gain for an ideal operational amplifier with R1 = 10kΩ and R2(negative feedback) = 1MΩ is
a) 20 db
b) 40 db
c) 60 db
d) 80 db

10. In an inverting op-amp circuit for which the gain is −4 V/V and the total resistance used is 100 kΩ. Then the value of R1 and R2 (negative feedback)
a) R1 = 20KΩ and R1 = 80KΩ
b) R1 = 80KΩ and R1 = 20KΩ
c) R1 = 40KΩ and R1 = 60KΩ
d) R1 = 50KΩ and R1 = 50KΩ