Virtual Lab

Summer and Subtractor using Operational Amplifier 741.

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Pre Test

1. Differential amplifier amplifies ___________ between two input signals

a) addition
b) subtraction
c) multiplication
d) division

2. The output voltage expression for inverting summing amplifier consisting of four internal resistors is _________ (Assume all the value of internal resistors are equal)

a) Vo = -(Rf/R )×(Va +Vb+Vc+Vd)
b) Vo = (Rf/R )×(Va +Vb+Vc+Vd)
c) Vo = (R/Rf )×(Va +Vb+Vc+Vd)
d) None of the mentioned

3. What will happen , if there is a mismatch between two input terminals in an op-amp?

a) Input Offset Voltage
b) Output Offset Voltage
c) Both the input and output offset voltage
d) None of the mentioned

4. Which of the following is not an Op-Amp characteristic?

a) High Gain
b) Low Gain
c) High input impedance
d) Low output impedance

5. ________ makes the output voltage to reduce to zero.

a) Input offset voltage
b) Output offset voltage
c) Offset minimizing voltage
d) Error voltage