City Guilds Model Questions Vol1 2025 Engineering Question 8

Practice objective / multiple choice question 8 from the 2025 City Guilds Model Questions Vol1 Engineering examination.

City Guilds Model Questions Vol1 2025 Engineering Objective / Multiple Choice Medium Difficulty
Question 8 CITY_GUILDS_MODEL_QUESTIONS_VOL1 • 2025 • ENGINEERING • objective

A three‑phase balanced Y‑connected load is supplied from a 400 V line‑to‑line source. The total real power consumed is 30 kW and the power factor is 0.8 lagging. Determine the per‑phase impedance magnitude and angle, and then find the resistance and inductive reactance of each phase.

Answer Options

A. Per‑phase impedance Z = 4.27 Ω ∠ 45.0°; resistance R = 3.42 Ω; inductive reactance X_L = 3.00 Ω.
B. Per‑phase impedance Z = 3.85 Ω ∠ 45.0°; resistance R = 2.70 Ω; inductive reactance X_L = 2.70 Ω.
Correct Answer C. Per‑phase impedance Z = 4.27 Ω ∠ 36.9°; resistance R = 3.42 Ω; inductive reactance X_L = 2.56 Ω.
D. Per‑phase impedance Z = 5.12 Ω ∠ 30.0°; resistance R = 4.42 Ω; inductive reactance X_L = 3.00 Ω.
Correct Answer
C
Correct Option:
Per‑phase impedance Z = 4.27 Ω ∠ 36.9°; resistance R = 3.42 Ω; inductive reactance X_L = 2.56 Ω.

About This Question

This is City Guilds Model Questions Vol1 2025 Engineering Question 8. It is one of the objective questions from the 2025 City Guilds Model Questions Vol1 Engineering examination.

Difficulty level: Medium .

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