Q. In a differential amplifier configuration, what does the operational amplifier amplify?
-
A.
The average of the input signals
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B.
The difference between the input signals
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C.
The sum of the input signals
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D.
The square of the input signals
Solution
A differential amplifier configuration amplifies the difference between the input signals.
Correct Answer:
B
— The difference between the input signals
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Q. In an inverting amplifier, if the feedback resistor is 10k Ohm and the input resistor is 1k Ohm, what is the gain?
Solution
The gain of an inverting amplifier is given by -Rf/Rin, which in this case is -10.
Correct Answer:
A
— -10
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Q. In an operational amplifier, what does the term 'common-mode rejection ratio' (CMRR) refer to?
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A.
The ability to reject noise
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B.
The ability to reject common-mode signals
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C.
The ratio of output to input voltage
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D.
The gain of the amplifier
Solution
Common-mode rejection ratio (CMRR) refers to the ability of an operational amplifier to reject common-mode signals.
Correct Answer:
B
— The ability to reject common-mode signals
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Q. What happens to the output of an operational amplifier if the non-inverting input is greater than the inverting input?
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A.
Output is zero
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B.
Output is positive saturation
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C.
Output is negative saturation
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D.
Output is equal to the input voltage
Solution
If the non-inverting input is greater than the inverting input, the output of the operational amplifier goes to positive saturation.
Correct Answer:
B
— Output is positive saturation
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Q. What is the output voltage of an operational amplifier when the input voltage is zero and the op-amp is powered?
-
A.
0V
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B.
Positive saturation voltage
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C.
Negative saturation voltage
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D.
Depends on the circuit configuration
Solution
The output voltage of an operational amplifier with zero input voltage depends on the circuit configuration and can be in saturation.
Correct Answer:
D
— Depends on the circuit configuration
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Q. What is the purpose of the offset null terminals in an operational amplifier?
-
A.
To adjust the gain
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B.
To eliminate noise
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C.
To nullify the output voltage when inputs are shorted
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D.
To increase bandwidth
Solution
The offset null terminals are used to nullify the output voltage when the inputs are shorted, correcting for any offset voltage.
Correct Answer:
C
— To nullify the output voltage when inputs are shorted
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Q. Which configuration of an operational amplifier provides the highest input impedance?
-
A.
Inverting
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B.
Non-inverting
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C.
Voltage follower
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D.
Differential
Solution
The voltage follower configuration provides the highest input impedance.
Correct Answer:
C
— Voltage follower
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Q. Which of the following is a common application of operational amplifiers?
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A.
Rectification
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B.
Signal amplification
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C.
Voltage regulation
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D.
All of the above
Solution
Operational amplifiers are used in various applications including signal amplification, voltage regulation, and rectification.
Correct Answer:
D
— All of the above
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