Basic Op-Amp Circuits

Q1: A basic series regulator has

A an error detector

B a load

C a reference voltage

D both an error detector and a reference voltage

Q2: A zero-level detector is a

A comparator with a sine-wave output

B comparator with a trip point referenced to zero

C peak detector

D limiter

Initially, the closed-loop gain (Acl) of a Wien-bridge oscillator should be

Acl < 3

Acl > 3

C 0

Acl approxequalto.gif 1

Q4: In an averaging amplifier, the input resistances are

A equal to the feedback resistance

B less than the feedback resistance

C greater than the feedback resistance

D unequal

Q5: 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

Q6: A two-pole high-pass active filter would have a roll-off rate of

A 40 dB/decade

B –40 dB/decade

C 20 dB/decade

D –20 dB/decade

Q7: A triangular-wave oscillator can consist of an op-amp comparator, followed by a(n)

A differentiator

B amplifier

C integrator

D multivibrator

The formula mcq19_1008_1.gif shows that for a given capacitor, if the voltage changes at a constant rate with respect to time, the current will

A increase

B decrease

C be constant

D decrease logarithmically

Q9: A digital-to-analog converter is an application of the

A scaling adder

B voltage-to-current converter

C noninverting amplifier

D adjustable bandwidth circuit

Q10: The ramp voltage at the output of an op-amp integrator

A increases or decreases at a linear rate

B increases or decreases exponentially

C is always increasing and never decreasing

D is constant

Q11: The center frequency of a band-pass filter is always equal to the

A bandwidth

B –3 dB frequency

bandwidth divided by Q

D geometric average of the critical frequencies

If the value of resistor Rf in an averaging amplifier circuit is equal to the value of one input resistor divided by the number of inputs, the output will be equal to

A the average of the individual inputs

B the inverted sum of the individual inputs

C the sum of the individual inputs

D the inverted average of the individual inputs

Q13: A comparator is an example of a(n)

A active filter

B current source

C linear circuit

D nonlinear circuit

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