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Question 1
In a balanced three-phase star-connected low voltage AC system in Hong Kong (400V line-to-line), what is the relationship between the line voltage (V_L) and the phase voltage (V_ph)?
Correct Answer:
V_L = sqrt(3) * V_ph, with line voltage leading phase voltage by 30 degrees
Question 2
A 400V balanced three-phase industrial motor draws a line current of 50 A at a lagging power factor of 0.85. What is the total active power (P) consumed by the motor?
Correct Answer:
29.44 kW
Question 3
According to Fortescue's theorem, an unbalanced three-phase power system can be resolved into three symmetrical components. Which sequence component is characterized by equal phase magnitudes rotating in the reverse phase sequence (L1-L3-L2)?
Correct Answer:
Negative sequence component (I_2)
Question 4
A 11kV/400V, 1500 kVA distribution transformer has a per-unit impedance of Z_pu = 0.05 (5%) on its rating base. Assuming an infinite 11kV busbar upstream, what is the prospective three-phase symmetrical short-circuit fault current (I_sc) at the LV secondary busbars?
Correct Answer:
43.30 kA
Question 5
A 400V 3-phase 4-wire sub-main circuit carries a balanced design load current of 120 A over a cable route length of 80 meters. The selected copper XLPE cable has a tabulated voltage drop value of 0.38 mV/A/m. What is the total voltage drop and percentage voltage drop at the load terminals?
Correct Answer:
3.648 V (0.91%)
Question 1
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About this Exam

Prepare with the HKIE Professional Assessment - Electrical Discipline Practice Questions - HKIE Professional Assessment - Electrical Discipline (Hong Kong Institution of Engineers) Exam practice quiz. This question bank includes 100 questions covering voltage, power, phase, current, and transformer. Use it to review important concepts, identify knowledge gaps, and build confidence for the related exam, course, or assessment.

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HKIE Professional Assessment - Electrical Discipline Practice Questions - HKIE Professional Assessment - Electrical Discipline (Hong Kong Institution of Engineers) Exam

This practice set contains 100 questions from the matching question bank and focuses on voltage, power, phase, current, and transformer. 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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