Q. In an RC circuit, what does the time constant (τ) represent?
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A.
The time taken to charge or discharge the capacitor
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B.
The maximum voltage across the capacitor
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C.
The resistance of the circuit
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D.
The frequency of oscillation
Solution
The time constant (τ) in an RC circuit is the time taken for the capacitor to charge to about 63.2% of the maximum voltage.
Correct Answer:
A
— The time taken to charge or discharge the capacitor
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Q. What happens to the output voltage of an inverting op-amp when the input voltage increases?
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A.
It increases
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B.
It decreases
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C.
It remains constant
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D.
It oscillates
Solution
In an inverting op-amp configuration, an increase in input voltage results in a decrease in output voltage.
Correct Answer:
B
— It decreases
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Q. What happens to the output voltage of an RC low-pass filter as frequency increases?
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A.
It increases
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B.
It decreases
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C.
It remains constant
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D.
It oscillates
Solution
In an RC low-pass filter, the output voltage decreases as the frequency of the input signal increases.
Correct Answer:
B
— It decreases
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Q. What happens to the output voltage of an RC low-pass filter as the frequency increases?
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A.
It increases
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B.
It decreases
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C.
It remains constant
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D.
It oscillates
Solution
In an RC low-pass filter, as the frequency increases, the output voltage decreases due to the filter's attenuation of high frequencies.
Correct Answer:
B
— It decreases
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Q. What is the primary role of a capacitor in an RC circuit?
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A.
To resist current flow
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B.
To store and release energy
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C.
To amplify signals
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D.
To convert AC to DC
Solution
The primary role of a capacitor in an RC circuit is to store and release electrical energy.
Correct Answer:
B
— To store and release energy
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Q. What is the purpose of an operational amplifier in an RC circuit?
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A.
To rectify the signal
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B.
To amplify the signal
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C.
To filter the signal
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D.
To switch the signal
Solution
Operational amplifiers can be used in RC circuits to filter signals, such as in low-pass or high-pass configurations.
Correct Answer:
C
— To filter the signal
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Q. What is the role of the capacitor in an RC circuit?
-
A.
To provide a path for DC current
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B.
To store and release energy
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C.
To amplify the signal
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D.
To rectify the signal
Solution
The capacitor in an RC circuit stores electrical energy and releases it, affecting the timing and filtering characteristics of the circuit.
Correct Answer:
B
— To store and release energy
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