Operational Amplifiers

Q1: The common-mode voltage gain is

A smaller than differential voltage gain

B equal to voltage gain

C greater than differential voltage gain

D None of the above

Q2: An ideal amplifier should have:

A high input current

B zero offset

C high output impedance

D moderate gain

Q3: All of the following are basic op-amp input modes of operation EXCEPT

A inverting mode

B common-mode

C double-ended

D single-ended

What is the output waveform of the circuit?

A sine wave

B square wave

C sawtooth wave

D triangle wave

Q5: An output that is proportional to the addition of two or more inputs is from which type of amplifier?

A differentiator

B difference

C summing

D analog subtractor

Q6: A noninverting closed-loop op-amp circuit generally has a gain factor:

A less than one

B greater than one

C of zero

D equal to one

Q7: The closed-loop voltage gain of an inverting amplifier equals:

A the ratio of the input resistance to the feedback resistance

B the open-loop voltage gain

C the feedback resistance divided by the input resistance

D the input resistance

Q8: With negative feedback, the returning signal

A is proportional to the output current

B is proportional to the differential voltage gain

C opposes the input signal

D aids the input signal

Q9: The Schmitt trigger is a two-state device that is used for:

A pulse shaping

B peak detection

C input noise rejection

D filtering

What is the output voltage?

A 15 V

B 5 V

C –5 V

D –15 V

Q11: The ratio between differential gain and common-mode gain is called:

A amplitude

B differential-mode rejection

C common-mode rejection

D phase

Q12: The voltage follower has a:

A closed-loop voltage gain of unity

B small open-loop voltage gain

C closed-loop bandwidth of zero

D large closed-loop output impedance

Q13: An astable multivibrator is also known as a:

A one-shot multivibrator

B free-running multivibrator

C bistable multivibrator

D monostable multivibrator

Q14: An ideal operational amplifier has

A infinite output impedance

B zero input impedance

C infinite bandwidth

D All of the above

Q15: A portion of the output that provides circuit stabilization is considered to be:

A negative feedback

B distortion

C open-loop

D positive feedback

Q16: If an op-amp has one input grounded and the other input has a signal feed to it, then it is operating as what?

A Common-mode

B Single-ended

C Double-ended

D Noninverting mode

Q17: If the gain of a closed-loop inverting amplifier is 3.9, with an input resistor value of 1.6 kilohms, what value of feedback resistor is necessary?

A 6240 ohms

B 2.4 kilohms

C 410 ohms

D 0.62 kilohms

What is this circuit?

A a low-pass filter

B a high-pass filter

C a bandpass filter

D a band-stop filter

Q19: A circuit whose output is proportional to the difference between the input signals is considered to be which type of amplifier?

A common-mode

B darlington

C differential

D operational

What is the frequency of this 555 astable multivibrator?


A 278 Hz

B 178 Hz

C 78 Hz

D 8 Hz

Q21: If the input to a comparator is a sine wave, the output is a:

A ramp voltage

B sine wave

C rectangular wave

D sawtooth wave

Q22: Op-amps used as high- and low-pass filter circuits employ which configuration?

A noninverting

B comparator

C open-loop

D inverting

Q23: In a PLL, to obtain lock, the signal frequency must:

A come within the lock range

B be less than the capture frequency

C come within the capture range

D be greater than the capture frequency

Q24: The open-loop voltage gain (Aol) of an op-amp is the

A external voltage gain the device is capable of

B internal voltage gain the device is capable of

C most controlled parameter

D same as Acl

Q25: How many leads does the TO-5 metal can package of an operational amplifier have?

A 8, 10, or 12

B 6, 8, or 10

C 8 or 14

D 8 or 16

What is the output waveform?

A sine wave

B square wave

C sawtooth wave

D triangle wave

What is the output waveform?

A sine wave

B square wave

C +15 V

D –15 V

Q28: What starts a free-running multivibrator?

A a trigger

B an input signal

C an external circuit

D nothing

Q29: In an open-loop op-amp circuit, whenever the inverting input (–) is negative relative to the noninverting input (+), the output will:

A swing negative

B close the loop

C be balanced

D swing positive

Q30: Input impedance [Zin(I)] of an inverting amplifier is approximately equal to:

A Ri

B Rf + Ri


Rf – Ri

mcq18_1012.gifDecreasing the gain in the given circuit could be achieved by

A reducing the amplitude of the input voltage

B increasing the value of the feedback resistor

C increasing the value of the input resistor

D removing the feedback resistor

Q32: A differential amplifier has a common-mode gain of 0.2 and a common-mode rejection ratio of 3250. What would the output voltage be if the single-ended input voltage was 7 mV rms?

A 1.4 mV rms

B 650 mV rms

C 4.55 V rms

D 0.455 V rms

mcq18_1012.gifWhat value of input resistance is needed in the given circuit to produce the given output voltage?

A 50 omega.gif

B 4 komega.gif

C 4.08 komega.gif

D 5 komega.gif

Q34: What three subcircuits does a phase locked loop (PLL) consist of?

A phase comparator, comparator, and VCO

B phase comparator, bandpass filter, and VCO

C phase comparator, bandpass filter, and demodulator

D phase comparator, low-pass filter, and VCO

Q35: Another name for a unity gain amplifier is:

A difference amplifier

B comparator

C single ended

D voltage follower

Q36: The input offset current equals the

A average of two base currents

B collector current divided by the current gain

C difference between two base-emitter voltages

D difference between two base currents

Q37: In order for an output to swing above and below a zero reference, the op-amp circuit requires:

A a resistive feedback network

B zero offset

C a wide bandwidth

D a negative and positive supply

Q38: If a noninverting amplifier has an RIN of 1000 ohms and an RFB of 2.5 kilohms, what is the RIN voltage when 1.42 mV is applied to the correct input?

A 3.5 mV

B ground

C 1.42 mV

D 0.56 mV

Q39: The major difference between ground and virtual ground is that virtual ground is only a:

A voltage reference

B current reference

C power reference

D difference reference

Q40: With negative feedback, the returning signal:

A aids the input signal

B is proportional to output current

C opposes the input signal

D is proportional to differential voltage gain

Q41: If the feedback/input resistor ratio of a feedback amplifier is 4.6 with 1.7 V applied to the noninverting input, what is the output voltage value?

A 7.82 V

B saturation

C cutoff

D 9.52 V

Q42: With a differential gain of 50,000 and a common-mode gain of 2, what is the common-mode rejection ratio?

A –87.9 dB

B –43.9 dB

C 43.9 dB

D 87.9 dB

Q43: What is the difference between common-mode and differential-mode input signals?

A phase relationship

B voltage

C current

D apparent power

Q44: When a capacitor is used in place of a resistor in an op-amp network, its placement determines:

A open- or closed-loop gain

B integration or differentiation

C saturation or cutoff

D addition or subtraction

Q45: How many logic states does an S-R flip-flop have?

A 2

B 3

C 4

D 5

Q46: The magnitude of closed-loop voltage gain (Acl) of an inverting amplifier equals:

A the ratio of the input resistance to the feedback resistance

B the open-loop voltage gain Aol

C the feedback resistance divided by the input resistance

D the input resistance

Q47: A series dissipative regulator is an example of a:

A linear regulator

B switching regulator

C shunt regulator

D dc-to-dc converter

Q48: If ground is applied to the (+) terminal of an inverting op-amp, the (–) terminal will:

A not need an input resistor

B be virtual ground

C have high reverse current

D not invert the signal

Q49: A circuit that uses an amplifier with passive filter elements is called a(n):

A relaxation oscillator

B signal generator

C differential amplifier

D active filter

What is the cutoff frequency of this low-pass filter?

A 4.8 kHz

B 3.8 kHz

C 2.8 kHz

D 1.8 kHz

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