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Operational Amplifiers - Technical MCQs

Q1:

What is the output waveform of the circuit?

A sine wave

B square wave

C sawtooth wave

D triangle wave

ANS:B - square wave

There is not negative feed back applied. The open loop gain of the opamp is of the order of 10^5. Then the output would be vin x 10^5 = 10^5 mV = 100 V.

Since the value of Vcc is +/- 15 V, the output will be clipped at I and - saturations. Therefore the output will be square wave.