Q. In a differential amplifier, what is the output voltage equation?
-
A.
Vout = (V2 - V1)(Rf/Rin)
-
B.
Vout = V1 - V2
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C.
Vout = (V1 + V2)/2
-
D.
Vout = V1 + V2
Solution
The output voltage of a differential amplifier is given by Vout = (V2 - V1)(Rf/Rin).
Correct Answer:
A
— Vout = (V2 - V1)(Rf/Rin)
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Q. In a differential amplifier, what is the output voltage if both inputs are equal?
-
A.
0V
-
B.
Vin
-
C.
Vout
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D.
Rf/Rin
Solution
If both inputs of a differential amplifier are equal, the output voltage is 0V.
Correct Answer:
A
— 0V
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Q. In a non-inverting amplifier configuration, what is the relationship between the input voltage and output voltage?
-
A.
Vout = Vin
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B.
Vout = Vin/2
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C.
Vout = Vin + 1
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D.
Vout = Vin * (1 + Rf/Rin)
Solution
In a non-inverting amplifier, the output voltage is given by Vout = Vin * (1 + Rf/Rin).
Correct Answer:
D
— Vout = Vin * (1 + Rf/Rin)
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Q. In a summing amplifier, how is the output voltage related to multiple input voltages?
-
A.
Vout = Vin1 + Vin2
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B.
Vout = (Vin1 + Vin2)/R
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C.
Vout = -Rf(Rin1*Vin1 + Rin2*Vin2)
-
D.
Vout = Vin1 * Vin2
Solution
In a summing amplifier, the output voltage is Vout = -Rf(Rin1*Vin1 + Rin2*Vin2).
Correct Answer:
C
— Vout = -Rf(Rin1*Vin1 + Rin2*Vin2)
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Q. What happens to the output of an operational amplifier when the input voltages are equal?
-
A.
Output is positive
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B.
Output is negative
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C.
Output is zero
-
D.
Output is infinite
Solution
When the input voltages of an operational amplifier are equal, the output is zero.
Correct Answer:
C
— Output is zero
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Q. What is the effect of negative feedback on the bandwidth of an operational amplifier?
-
A.
Increases bandwidth
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B.
Decreases bandwidth
-
C.
No effect
-
D.
Depends on the configuration
Solution
Negative feedback in an operational amplifier increases the bandwidth of the amplifier.
Correct Answer:
A
— Increases bandwidth
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Q. What is the primary characteristic of a voltage follower configuration using an operational amplifier?
-
A.
High gain
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B.
Low gain
-
C.
Unity gain
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D.
Negative gain
Solution
The primary characteristic of a voltage follower configuration is that it provides unity gain.
Correct Answer:
C
— Unity gain
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Q. What is the primary function of a feedback resistor in an operational amplifier circuit?
-
A.
To increase gain
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B.
To stabilize the output
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C.
To limit current
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D.
To reduce noise
Solution
The feedback resistor is used to set the gain of the operational amplifier, thus increasing the overall gain.
Correct Answer:
B
— To stabilize the output
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Q. What is the purpose of a bypass capacitor in an operational amplifier circuit?
-
A.
To increase gain
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B.
To filter noise
-
C.
To stabilize voltage
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D.
To reduce power consumption
Solution
A bypass capacitor is used to filter out noise and stabilize the voltage in an operational amplifier circuit.
Correct Answer:
B
— To filter noise
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Q. Which configuration of an operational amplifier provides a phase shift of 180 degrees?
-
A.
Inverting amplifier
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B.
Non-inverting amplifier
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C.
Voltage follower
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D.
Differential amplifier
Solution
The inverting amplifier configuration provides a phase shift of 180 degrees.
Correct Answer:
A
— Inverting amplifier
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