City Guilds Model Questions Vol1 2025 Engineering Question 10

Practice objective / multiple choice question 10 from the 2025 City Guilds Model Questions Vol1 Engineering examination.

City Guilds Model Questions Vol1 2025 Engineering Objective / Multiple Choice Medium Difficulty
Question 10 CITY_GUILDS_MODEL_QUESTIONS_VOL1 • 2025 • ENGINEERING • objective

A series RLC circuit contains a resistor \(R = 10\;\Omega\), an inductor \(L = 0.2\;\text{H}\) and is connected to a 50 Hz AC source. (a) Determine the capacitance \(C\) required for the circuit to be at resonance. (b) At resonance, compute the total impedance and the rms current drawn from the source if the source voltage is 120 V rms.

Answer Options

Correct Answer A. C ≈ 5.1 × 10⁻⁵ F (≈ 51 µF); impedance = 10 Ω; rms current = 12 A.
B. C ≈ 1.0 × 10⁻⁴ F (≈ 100 µF); impedance = 10 Ω; rms current = 12 A.
C. C ≈ 5.1 × 10⁻⁵ F (≈ 51 µF); impedance = 20 Ω; rms current = 6 A.
D. C ≈ 2.5 × 10⁻⁵ F (≈ 25 µF); impedance = 10 Ω; rms current = 12 A.
Correct Answer
A
Correct Option:
C ≈ 5.1 × 10⁻⁵ F (≈ 51 µF); impedance = 10 Ω; rms current = 12 A.

About This Question

This is City Guilds Model Questions Vol1 2025 Engineering Question 10. It is one of the objective questions from the 2025 City Guilds Model Questions Vol1 Engineering examination.

Difficulty level: Medium .

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