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Question 1
In a balanced three-phase star (Y) connected electrical power system, what is the fundamental mathematical relationship between line-to-line voltage U and phase-to-neutral voltage V?
Correct Answer:
U = sqrt(3) * V with a phase lead of 30 degrees
Question 2
A balanced three-phase industrial load operates at a line-to-line voltage of U = 400 V, drawing a line current of I = 15 A with a lagging power factor of cos(phi) = 0.80. What is the total active power P consumed by this installation?
Correct Answer:
P = 8.31 kW
Question 3
An electrical workshop draws an active power of P = 24 kW and a reactive power of Q = 18 kvar from a 400 V three-phase supply. What is the apparent power S and overall power factor cos(phi) of the facility?
Correct Answer:
S = 30.0 kVA and cos(phi) = 0.80
Question 4
In an unbalanced four-wire three-phase star system with neutral conductor, phase currents are measured as i1(t) = 20*sin(omega*t) A, i2(t) = 20*sin(omega*t - 2*pi/3) A, and i3(t) = 0 A (phase 3 open). What is the RMS magnitude of the current flowing in the neutral conductor I_N?
Correct Answer:
I_N = 14.14 A
Question 5
Why do electrical utility operators such as SBEE penalize industrial installations operating with a low power factor (e.g., cos phi < 0.90)?
Correct Answer:
Low power factor increases line current for the same active power, causing higher I^2*R transmission losses and voltage drops
Question 1
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Prepare with the Bac F3 Bénin Practice Questions - Baccalauréat Série F3 (Électrotechnique) - Bénin Exam practice quiz. This question bank includes 100 questions covering power, three-phase, electrical, voltage, and standard. Use it to review important concepts, identify knowledge gaps, and build confidence for the related exam, course, or assessment.

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Bac F3 Bénin Practice Questions - Baccalauréat Série F3 (Électrotechnique) - Bénin Exam

This practice set contains 100 questions from the matching question bank and focuses on power, three-phase, electrical, voltage, and standard. Work through each question carefully, review the provided solutions, and revisit topics that need more study before your next attempt.

This is an independent study resource intended for practice and review; it is not an official examination or an endorsement by any organization named in the title.

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