Operational Amplifier MCQs

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1.An operational amplifier's output voltage rises by 8 volts over a period of 12 microseconds. What is the slew rate of the op-amp?

90 volts per microsecond0.67 volts per microsecond1.5 volts per microsecondNone of the above

2.What effect does negative feedback have on a circuit's input impedance and bandwidth?

Raises both input and output impedancesEnhances input impedance and expands bandwidthReduces output impedance and limits bandwidthHas no impact on impedance or bandwidthLowers input impedance and bandwidth

3.In a differential amplifier, the differential voltage gain is calculated as RC divided by which of the following?

4.In a differential amplifier, the gain for common-mode signals is given by the value of RC divided by which of the following?

r’e2 times r’er’e divided by 22 times RE

5.How does the common-mode voltage gain compare to the differential voltage gain?

It is less than the differential voltage gainIt is the same as the differential voltage gainIt exceeds the differential voltage gainNone of the above

6.The input impedance of a differential amplifier is given by r’e multiplied by which of the following?

7.What is the approximate voltage at the node located at the top of the tail resistor?

Voltage of the collector supplyApproximately zero voltsVoltage of the emitter supplyProduct of tail current and base resistance

8.What types of signals can an operational amplifier amplify?

Only alternating current (AC) signalsOnly direct current (DC) signalsBoth alternating current (AC) and direct current (DC) signalsNeither alternating current (AC) nor direct current (DC) signals

9.What is the closed-loop voltage gain of a non-inverting amplifier with an input resistor (Ri) of 1 kΩ and a feedback resistor (Rf) of 100 kΩ?

10.In an operational amplifier circuit with negative feedback, where is the output signal directed?

11.Which of the following is the most plausible value for the open-loop voltage gain of an operational amplifier?

12,00080 decibels100,000

12.Given that ADM equals 3500 and ACM is 0.35, what is the value of the CMRR?

122510,00080 decibelsBoth options (A) and (B) are correct

13.What is the typical characteristic of common-mode gain in an amplifier?

Extremely largeExtremely smallExactly oneCannot be determined

14.What occurs in differential-mode operation?

Signals with opposite phases are fed into the inputsThe amplifier's gain equals oneThe output signals vary in amplitudeA single supply voltage powers the circuit

15.How would you describe the differential gain in an amplifier?

Extremely highExtremely lowVaries with input voltageApproximately 100

16.In a single-ended operation of a differential amplifier, what is the typical input configuration?

The output terminal is connected to groundOne input terminal is connected to ground while the signal is applied to the other inputBoth input terminals are tied togetherThe output signal does not undergo inversion

17.What is the ideal output voltage of an operational amplifier when both its inputs are at zero volts?

Matches the positive power supply voltageMatches the negative power supply voltageExactly zero voltsEquivalent to the common-mode rejection ratio (CMRR)None of the above

18.What characterizes the common mode in a circuit?

Both input terminals are connected to groundThe outputs are linked directly to each otherThe same signal is present on both input terminalsThe output signals maintain the same phase

19.Which of the following statements correctly describe a differential amplifier?

It forms a component within an operational amplifierIt features a single input and a single outputIt provides two separate outputsBoth statements A and B are trueNone of the above

20.In a differential amplifier, the tail current is equal to which of the following?

Half the value of one collector currentThe same as one collector currentTwice the magnitude of either collector currentEqual to the difference between the base currents