Class 12 Physics · Chapter 5 · Test 3
RLC Circuits and Resonance
37 MCQs
37 questions · 35 min · 37 marks
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Sample questions
The first 5 of 37. Try each one, then tap to see the answer.
Question 1
The impedance of an RLC series circuit is:
- AZ = R + XL + Xc
- BZ = sqrt(R² + (XL + Xc)²)
- CZ = R + (XL - Xc)
- DZ = sqrt(R² + (XL - Xc)²)
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Answer: D
XL and Xc act in opposite directions so the net reactance is XL - Xc.
Question 2
At high frequency an RLC series circuit behaves like an:
- ARC series circuit
- BRL series circuit
- CPure resistor
- DOpen circuit
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Answer: B
At high frequency XL is much larger than Xc so inductance dominates.
Question 3
At low frequency an RLC series circuit behaves like an:
- ARC series circuit
- BRL series circuit
- CPure inductor
- DShort circuit
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Answer: A
At low frequency Xc is much larger than XL so capacitance dominates.
Question 4
The resonance condition in an RLC series circuit is:
- AXL = R
- BXc = R
- CXL = Xc
- DXL = 2Xc
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Answer: C
At resonance the inductive and capacitive reactances are equal and opposite.
Question 5
The resonance frequency of an RLC series circuit is:
- Af0 = 2π sqrt(LC)
- Bf0 = 1/(2π sqrt(LC))
- Cf0 = sqrt(LC)/2π
- Df0 = 1/(LC)
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Answer: B
Setting ωL = 1/ωC gives f0 = 1/(2π sqrt(LC)).
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