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Operational Amplifiers
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Operational Amplifiers
mcqs by everyone
______ is NOT a characteristic of an ideal op-amp
Infinite voltage gain
Minimum bandwidth
Infinite input impedance
Zero output impedance
What is the frequency of this 555 astable multivibrator
178 Hz
8 Hz
78 Hz
278 Hz
The input impedance is ______ for the amplifier in the givencircuit.
The data sheet values are Zin = 3 M, Zout = 80 , and Aol = 250,000
68.6 k
3 m
4.7 k
22.7 k
The given circuit is ___
a noninverting amplifier
a differential amplifier
an inverting amplifier
a voltage follower
How many logic states does an S-R flip-flop have
5
3
2
4
The ratio between differential gain and common-mode gain is called
common-mode rejection
differential-mode rejection
Phase
Amplitude
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
3.5 mV
1.42 mV
ground
0.56 mV
What is the output waveform of the circuit
sawtooth wave
Square wave
triangle wave
Sine wave
A portion of the output that provides circuit stabilization is considered to be
negative feedback
Distortion
positive feedback
open-loop
The voltage follower has a
closed-loop voltage gain of unity
small open-loop voltage gain
closed-loop bandwidth of zero
large closed-loop output impedance
A virtual ground is a(n) ______ ground because this point is at zero volts
Voltage
Ordinary
Earth
chassis
Another name for a unity gain amplifier is
difference amplifier
voltage follower
single ended
Comparator
What value of input resistance is needed in the given circuit to produce the given output voltage
4 k
5 k
4.08 k
50
A series dissipative regulator is an example of a
switching regulator
shunt regulator
linear regulator
dc-to-dc converter
In a PLL, to obtain lock, the signal frequency must
be greater than the capture frequency
come within the capture range
be less than the capture frequency
come within the lock range
The input voltage must be ______ in the given circuit to obtain the given output voltage
480 mV
600 mV
343 mV
400 mV
A circuit whose output is proportional to the difference between the input signals is considered to be which type of amplifier
darlington
Differential
operational
common-mode
What is the output voltage
15 V
–5 V
–15 V
5 V
A ______ is not a multivibrator
Bistable
Flip-Flop
one-shot
VCO
The Schmitt trigger is a two-state device that is used for
filtering
peak detection
input noise rejection
pulse shaping
When a capacitor is used in place of a resistor in an op-amp network, its placement determines
saturation or cutoff
addition or subtraction
open- or closed-loop gain
integration or differentiation
With a differential gain of 50,000 and a common-mode gain of 2, what is the common-mode rejection ratio
–43.9 dB
–87.9 dB
43.9 dB
87.9 dB
Op-amps used as high- and low-pass filter circuits employ which configuration
noninverting
inverting
open-loop
Comparator
What three subcircuits does a phase locked loop (PLL) consist of
phase comparator, comparator, and VCO
phase comparator, low-pass filter, and VCO
phase comparator, bandpass filter, and VCO
phase comparator, bandpass filter, and demodulator
The Q of a crystal _________
is about 40 or so in most cases
is extremely high
is extremely low
None of the above
If ground is applied to the (+) terminal of an inverting op-amp, the (–) terminal will
be virtual ground
not invert the signal
have high reverse current
not need an input resistor
A circuit that has an output equal to the algebraic sum of the inputs is called a(n) ______
differential amplifier
integrator amplifier
voltage multiplier
summing amplifier
The 555 timer can be connected to operate a(n) ___________
astable multivibrator and a monostable multivibrator
astable multivibrator
monostable multivibrator
bistable multivibrator
The major difference between ground and virtual ground is that virtual ground is only a
difference reference
power reference
current reference
voltage reference
The resistors Rf and Ri in an op-amp circuit control ______
open and closed loop gain
negative feedback and voltage gain
positive feedback and current gain
negative feedback and power gain
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