# Summing, Scaling & Averaging Amplifier – 2 MCQ’s

This set of Linear Integrated Circuits Multiple Choice Questions & Answers (MCQs) focuses on “Summing, Scaling & Averaging Amplifier – 2″.

1. Expression for output voltage of non-inverting summing amplifier with five input voltage?
a) Vo = 5×( Va + Vb+ Vc+ Vd+ Ve)
b) Vo = [1+( Rf/R1)]× ( Va + Vb+ Vc+ Vd+ Ve)
c) Vo = Va + Vb+ Vc+ Vd+ Ve
d) Vo = ( Va + Vb+ Vc+ Vd+ Ve) /5

2. Find the value of V1 in the circuit shown below?

a) 4v
b) 2v
c) 3v
d) None of the mentioned

3. Which type of amplifier has output voltage equal to the average of all input voltages?
a) Inverting averaging amplifier
b) Non-inverting averaging amplifier
c) Non-inverting summing amplifier
d) Inverting scaling amplifier

4. If the gain of a non-inverting averaging amplifier is one, determine the input voltages if the output voltage, if the output voltage is 3v?
a) V1 =6v ,V2=3v and V3=2v
b) V1 =9v ,V2=5v and V3=-4v
c) V1 =8v ,V2=-6v and V3=1v
d) V1 =7v ,V2=4v and V3=-3v

5. Find the type of amplifier that cannot be constructed in differential configuration?
a) Summing amplifier
b) Scaling amplifier
c) Averaging amplifier
d) Subtractor

6. Find the differential amplifier configured as a subtractor from the given circuit.
a) b) c) d) 7. In the circuit shown, supply voltage = ±15v, Va= +3v , Vb= -4v , Vc= +5v, R= R1= 1kΩ and RF= 2kΩ. 741 op-amp has A= 2×105 and R1= 10kΩ. Determine the output voltage internal resistance of the circuit?

a) Vo ≅3v , RiF=6.67MΩ
b) Vo ≅3v , RiF= 7MΩ
c) Vo ≅3v , RiF=9.2MΩ
d) Vo ≅3v , RiF= 3.5MΩ

8. Calculate the output voltage, when a voltage of 12mv is applied to the non-inverting terminal and 7mv is applied to inverting terminal of a subtractor.
a) 19mv
b) 5mv
c) 1.7mv
d) 8.4mv

9. How many additional sources are connected to each input terminal to obtain an eight input summing amplifier?
a) Six
b) Three
c) Four
d) Eight

10. The output voltage of a summing amplifier is equal to (assume sum of input voltage as Vn )
a) Vn (non-inverting terminal)+ Vn (inverting terminal)
b) Vn (non-inverting terminal)+ (-Vn (inverting terminal)
c) -Vn (non-inverting terminal)+ (-Vn (inverting terminal)
d) -Vn (non-inverting terminal)+ Vn (inverting terminal)

11. Calculate the output voltage for the summing amplifier given below, where R=2kΩ and RL =10kΩ.

a) 4v
b) 18v
c) 8v
d) None of the mentioned 5 Star
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