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Operational Amplifiers
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Operational Amplifiers
mcqs by everyone
When a capacitor is used in place of a resistor in an op-amp network, its placement determines
open- or closed-loop gain
saturation or cutoff
addition or subtraction
integration or differentiation
______ is NOT a characteristic of an ideal op-amp
Minimum bandwidth
Zero output impedance
Infinite input impedance
Infinite voltage gain
All of the following are basic op-amp input modes of operation EXCEPT
double-ended
inverting mode
common-mode
single-ended
The Schmitt trigger is a two-state device that is used for
filtering
input noise rejection
peak detection
pulse shaping
The voltage required to force the differential output to zero is called _______
input-offset voltage
input-offset current
input bias current
slew rate voltage
The closed-loop voltage gain of an inverting amplifier equals
the ratio of the input resistance to the feedback resistance
the open-loop voltage gain
the input resistance
the feedback resistance divided by the input resistance
A circuit that uses an amplifier with passive filter elements is called a(n)
relaxation oscillator
active filter
signal generator
differential amplifier
The input voltage must be ______ in the given circuit to obtain the given output voltage
600 mV
343 mV
480 mV
400 mV
The open-loop voltage gain
(Aol) of an op-amp is the
external voltage gain the device is capable of
internal voltage gain the device is capable of
same as Acl
most controlled parameter
If the input to a comparator is a sine wave, the output is a(n) _________
rectangular wave
Sine wave
ramp voltage
sawtooth wave
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
Saturation
7.82 V
Cutoff
9.52 V
The feedback resistor has a value of ______ in the given circuit
2 K
10.5 k
40 K
21 k
What is the output waveform of the circuit
Square wave
sawtooth wave
Sine wave
triangle wave
An ideal amplifier should have
zero offset
high output impedance
moderate gain
high input current
A circuit that has an output equal to the algebraic sum of the inputs is called a(n) ______
summing amplifier
differential amplifier
voltage multiplier
integrator amplifier
If ground is applied to the (+) terminal of an inverting op-amp, the (–) terminal will
have high reverse current
be virtual ground
not need an input resistor
not invert the signal
An oscillator whose frequency can be controlled by an input "control voltage" is called a(n) ______
PLL
VCO
S-R latch
Schmitt trigger
An output that is proportional to the addition of two or more inputs is from which type of amplifier
differentiator
summing
analog subtractor
difference
What is the output waveform
Sine wave
Square wave
+15 V
–15 V
An op-amp circuit in which the output voltage is equal to the difference between the two input voltages is called a(n) _____
differential amplifier
differentiator
integrator
voltage regulator
The voltage follower has a
small open-loop voltage gain
closed-loop voltage gain of unity
closed-loop bandwidth of zero
large closed-loop output impedance
Another name for a unity gain amplifier is
voltage follower
single ended
Comparator
difference amplifier
Input impedance [Zin(I)] of an inverting amplifier is approximately equal to
Rf – Ri
∞
Rf + Ri
Ri
Op-amps used as high- and low-pass filter circuits employ which configuration
open-loop
inverting
Comparator
noninverting
With a differential gain of 50,000 and a common-mode gain of 2, what is the common-mode rejection ratio
87.9 dB
–43.9 dB
–87.9 dB
43.9 dB
The voltage gain is ______ for the amplifier in the given circuit
–7
–6
–4
–5
The ratio between differential gain and common-mode gain is called
Amplitude
Phase
common-mode rejection
differential-mode rejection
In order for an output to swing above and below a zero reference, the op-amp circuit requires
a wide bandwidth
a negative and positive supply
zero offset
a resistive feedback network
With negative feedback, the returning signal
aids the input signal
opposes the input signal
is proportional to the differential voltage gain
is proportional to the output current
How many leads does the TO-5 metal can package of an operational amplifier have
8, 10, or 12
8 or 16
8 or 14
6, 8, or 10
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