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Free Practice Questions for MEngC PE Electrical Building Services

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Sample MEngC PE Electrical Building Services Practice Questions

Try these sample questions to review concepts for the MEngC PE Electrical Building Services exam. Each question includes a detailed explanation. Start the interactive quiz above for the full 100+ question experience with AI tutoring.

1In a balanced three-phase four-wire star (Y) connected electrical supply system with a line-to-neutral voltage of 230 V RMS, what is the nominal line-to-line RMS voltage and the phase angle displacement between line and phase voltages?
A.400 V RMS, with line voltage leading the corresponding phase voltage by 30 degrees
B.400 V RMS, with line voltage lagging the corresponding phase voltage by 30 degrees
C.325 V RMS, with line voltage in phase with the corresponding phase voltage
D.230 V RMS, with line voltage leading the corresponding phase voltage by 60 degrees
Explanation: In a balanced three-phase star (Y) connected system, the line-to-line voltage magnitude is related to the phase (line-to-neutral) voltage by V_L = sqrt(3) * V_ph. For a phase voltage of 230 V, V_L = 1.73205 * 230 V = 398.37 V (nominally 400 V). Furthermore, phasor analysis (V_AB = V_A - V_B) demonstrates that each line-to-line voltage leads its corresponding phase-to-neutral voltage by 30 degrees.
2A balanced delta-connected three-phase load consumes a total active power of 36 kW from a 400 V, 50 Hz supply at a lagging power factor of 0.80. What are the phase current (I_ph) in each load branch and the line current (I_L) supplied by the mains?
A.Phase current I_ph = 64.95 A, Line current I_L = 37.5 A
B.Phase current I_ph = 37.5 A, Line current I_L = 64.95 A
C.Phase current I_ph = 21.65 A, Line current I_L = 37.5 A
D.Phase current I_ph = 30.0 A, Line current I_L = 51.96 A
Explanation: For a balanced three-phase system, total power is P = sqrt(3) * V_L * I_L * cos(phi). Rearranging gives I_L = P / (sqrt(3) * V_L * cos(phi)) = 36000 / (1.73205 * 400 * 0.80) = 36000 / 554.256 = 64.95 A. In a delta-connected load, the relationship between line and branch phase current is I_L = sqrt(3) * I_ph, so I_ph = I_L / sqrt(3) = 64.95 / 1.73205 = 37.5 A.
3A 400 V balanced three-phase star-connected distribution feeder supplies a load drawing 50 A per line at a power factor of 0.866 lagging. What are the total apparent power (S), active power (P), and reactive power (Q) supplied by the feeder?
A.S = 34.64 kVA, P = 17.32 kW, Q = 30.00 kVAR
B.S = 20.00 kVA, P = 17.32 kW, Q = 10.00 kVAR
C.S = 34.64 kVA, P = 30.00 kW, Q = 17.32 kVAR
D.S = 60.00 kVA, P = 51.96 kW, Q = 30.00 kVAR
Explanation: Apparent power is S = sqrt(3) * V_L * I_L = 1.73205 * 400 V * 50 A = 34,641 VA = 34.64 kVA. Active power is P = S * cos(phi) = 34.641 * 0.866 = 30.00 kW. Reactive power is Q = S * sin(phi) = S * sqrt(1 - 0.866^2) = 34.641 * 0.500 = 17.32 kVAR.
4In a three-phase four-wire low-voltage building distribution system supplying perfectly balanced linear loads, what is the magnitude of the steady-state current flowing through the neutral conductor?
A.Equal to one-third of the total connected load current
B.Equal to the line current I_L, because the neutral conductor carries the common return current of the system
C.Equal to 1.732 times the line current, due to constructive interference between phase currents
D.0 A, because the phasor sum of the three balanced line currents displaced by 120 degrees is exactly zero
Explanation: In a three-phase four-wire system with balanced linear loads, the three line currents have identical magnitudes and are mutually displaced by 120 electrical degrees: I_N = I_A + I_B + I_C = I * (1 + e^(-j120) + e^(+j120)) = 0. Therefore, the neutral conductor carries zero fundamental current under balanced linear conditions.
5A three-phase four-wire 400/230 V star-connected distribution board supplies single-phase resistive lighting loads. The line currents measured at fundamental frequency are I_A = 60 A at 0 deg, I_B = 40 A at -120 deg, and I_C = 40 A at +120 deg. What is the magnitude of the resulting neutral current I_N?
A.20 A
B.140 A
C.46.7 A
D.0 A
Explanation: The neutral current is the phasor sum of the three line currents: I_N = -(I_A + I_B + I_C). Converting to rectangular coordinates: I_A = 60 + j0; I_B = 40 * cos(-120) + j40 * sin(-120) = -20 - j34.641; I_C = 40 * cos(120) + j40 * sin(120) = -20 + j34.641. Summing the components: I_A + I_B + I_C = (60 - 20 - 20) + j(0 - 34.641 + 34.641) = 20 + j0 A. Therefore, the magnitude of the neutral current is |I_N| = 20 A.
6What is the standard procedure to reverse the direction of rotation of a three-phase squirrel-cage induction motor operating on a building services ventilation system?
A.Interchange the incoming neutral conductor with any one of the phase conductors
B.Interchange any two of the three incoming supply phase conductors at the motor terminal box
C.Reverse the polarity of all three phase conductors simultaneously
D.Install a series resistor in one phase winding to shift the magnetic axis
Explanation: The direction of rotation of a three-phase induction motor is determined by the phase sequence (direction of rotation of the stator revolving magnetic field). Interchanging any two line conductors (e.g., swapping L1 and L2) reverses the phase sequence from positive (L1-L2-L3) to negative (L2-L1-L3), which reverses the revolving magnetic field and motor rotation.
7In symmetrical component analysis (Fortescue theorem) used for power system fault calculations, what are the sequence components present during a single line-to-ground (L-G) fault on an unloaded generator?
A.Positive and negative sequence currents are equal in magnitude but opposite in phase; zero sequence is zero
B.Only zero sequence current is present; positive and negative sequence currents remain zero
C.Positive, negative, and zero sequence currents are all equal in magnitude and in phase at the fault location: I_a1 = I_a2 = I_a0
D.Positive sequence current is double the negative sequence current, and zero sequence current is absent
Explanation: In symmetrical component analysis of a single line-to-ground fault (phase A to ground), boundary conditions require I_b = 0 and I_c = 0. Substituting these into the symmetrical component transformation matrix yields I_a1 = (1/3)(I_a), I_a2 = (1/3)(I_a), and I_a0 = (1/3)(I_a). Therefore, the three sequence networks are connected in series at the fault point, and I_a1 = I_a2 = I_a0.
8Before paralleling an incoming diesel generator with a live building main switchboard busbar, which set of conditions must be strictly satisfied at the moment the breaker is closed?
A.Identical governor droop percentage, zero reactive power output, and equal neutral grounding resistance
B.Equal active power rating, equal power factor, identical frequency, and 90-degree phase lead
C.Equal terminal voltage magnitude, identical short-circuit ratio, and 180-degree phase opposition
D.Equal terminal voltage magnitude, identical frequency, identical phase sequence, and zero phase angle difference
Explanation: Paralleling (synchronizing) an alternator to an energized busbar requires four essential conditions: (1) terminal voltage magnitude must match busbar voltage; (2) alternator frequency must match busbar frequency (or be marginally faster to prevent reverse-power tripping); (3) phase sequence must be identical (e.g. L1-L2-L3); and (4) phase angle displacement between corresponding phases must be zero at the moment of breaker closure.
9What is the synchronous speed of a 4-pole three-phase AC induction motor connected to a standard 50 Hz public distribution supply?
A.1,500 rpm
B.3,000 rpm
C.1,440 rpm
D.1,000 rpm
Explanation: Synchronous speed N_s is governed by the formula N_s = (120 * f) / P, where f is the supply frequency in Hertz and P is the number of magnetic poles. For a 4-pole machine at 50 Hz: N_s = (120 * 50) / 4 = 6000 / 4 = 1,500 revolutions per minute (rpm).
10A 4-pole, 50 Hz three-phase induction motor driving a chilled water circulating pump operates at a full-load rotor speed of 1,425 rpm. What is the operational per-unit slip of the motor at this loading condition?
A.0.025 (2.5%)
B.0.05 (5.0%)
C.0.075 (7.5%)
D.0.015 (1.5%)
Explanation: The synchronous speed for a 4-pole 50 Hz motor is N_s = (120 * 50) / 4 = 1,500 rpm. Slip is defined as s = (N_s - N_r) / N_s. With rotor speed N_r = 1,425 rpm: s = (1,500 - 1,425) / 1,500 = 75 / 1,500 = 0.05 or 5.0%.

About the MEngC PE Electrical Building Services Exam

The Myanmar Engineering Council Professional Engineer (P.E.) route assesses experienced engineers through professional development, written assessment, an English Professional Experiences and Competency Report (PECR), and a panel interview with a project presentation. The current Electrical (B.S) P.E. Part-I Day-2 outline covers protection and safety, earthing and lightning, building services, testing and commissioning, electrical codes and standards, and electronics and control. Detailed supplemental topics in this bank also draw from MEngC's published 2017 Electrical (B.S) scope.

Exam sponsor: Myanmar Engineering Council (MEngC). The requirements and fees below concern the certification or admission exam, separate from our free practice resources.

Assessment

The full PE registration route includes at least 30 hours of professional development training, written assessment, a 2,000–4,000-word English Professional Experiences and Competency Report (PECR), and a panel interview with a project presentation. The current Electrical (B.S) Part-I Day-2 outline has a closed-book morning session (24 questions, answer 20; MCQ and other formats) and an open-book afternoon session (12 questions, answer 10; problem solving and other formats). A separate Day-1 and separately scheduled Part-II also form part of the published route, subject to route exemptions.

Time Limit

Part-I Day-2: 4 hours (2-hour morning session and 2-hour afternoon session). The published route also includes a separate Day-1 for candidates who are not exempt and a separately scheduled Part-II stage.

Passing Score

Not published by the Myanmar Engineering Council in the public rules, Electrical Building Services Part-I outline, or current PE guidance reviewed.

Exam / Certification Fees

61,500 MMK PE registration fee. The official fee structure lists 30,000 MMK for PAWE Part-I, 30,000 MMK for PAWE Part-II, and 40,000 MMK for professional development training.

Exam sponsor website

Fees, eligibility, and exam policies can change. Confirm them with the exam sponsor before applying or paying.

Our practice resources: topics covered

We aim to reflect publicly available exam outlines and topic information in our study resources. Coverage, format, and difficulty may differ from the actual exam, and we cannot guarantee that every detail is accurate or current. Confirm exam requirements, fees, and policies with the official exam sponsor.

Day-2 — 6 of 36 set questions (16.7%)

Electrical Protection and Safety

Protective-device operation, overcurrent protection, conductor protection, discrimination, and safe electrical installation practice.

Day-2 — 3 of 36 set questions (8.3%)

Earthing and Lightning System

Earthing purpose and methods, earth-fault loop impedance and current, protective-conductor sizing, and lightning protection.

Day-2 — 9 of 36 set questions (25.0%)

Building Services Engineering

Building electrical design, cable selection and voltage drop, power-factor improvement, distribution systems, lighting design, and short-circuit calculations.

Day-2 — 3 of 36 set questions (8.3%)

Testing and Commissioning

Construction-stage inspection, completion testing, measuring instruments, and regular maintenance procedures.

Day-2 — 9 of 36 set questions (25.0%)

Electrical Codes, Rules, Regulations, and Standards

The 2024 MEngC outline names MNBC 2020, the IET Wiring Regulations, CP 5, SS 555, HPBC electrical guidance, and temporary electrical power supply references; Myanmar's Ministry of Construction has since published MNBC 2025.

Day-2 — 6 of 36 set questions (16.7%)

Electronics, Control Systems, Power Electronics, and Industrial Electronics

Industrial electronics, power electronics, PLC/PIC fundamentals, block diagrams, characteristic equations, frequency response, and stability.

Preparing for the MEngC PE Electrical Building Services Exam

What You Need to Know

  • Passing score: Not published by the Myanmar Engineering Council in the public rules, Electrical Building Services Part-I outline, or current PE guidance reviewed.
  • Assessment: The full PE registration route includes at least 30 hours of professional development training, written assessment, a 2,000–4,000-word English Professional Experiences and Competency Report (PECR), and a panel interview with a project presentation. The current Electrical (B.S) Part-I Day-2 outline has a closed-book morning session (24 questions, answer 20; MCQ and other formats) and an open-book afternoon session (12 questions, answer 10; problem solving and other formats). A separate Day-1 and separately scheduled Part-II also form part of the published route, subject to route exemptions.
  • Time limit: Part-I Day-2: 4 hours (2-hour morning session and 2-hour afternoon session). The published route also includes a separate Day-1 for candidates who are not exempt and a separately scheduled Part-II stage.
  • Exam / certification fees: 61,500 MMK PE registration fee. The official fee structure lists 30,000 MMK for PAWE Part-I, 30,000 MMK for PAWE Part-II, and 40,000 MMK for professional development training. Official sources

Using Our Practice Resources

  • Work through all 100 available questions
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MEngC PE Electrical Building Services: Suggested Study Strategy

1Review the references named in the 2024 MEngC outline, and check current MEngC notices because the Ministry of Construction has since published MNBC 2025.
2Practice multi-step calculations for power factor correction, three-phase load balancing, transformer equivalent circuit parameters, and protective conductor sizing using the adiabatic equation S = sqrt(I^2 * t) / k.
3Understand lightning protection risk assessment and protection zones using the rolling sphere and mesh methods defined in SS555 / IEC 62305.
4Study industrial electronics and motor control circuits, including SCRs, Triacs, optocouplers, PLC ladder logic structures, and control system transfer function stability criteria.

Frequently Asked Questions

Who is eligible to apply for the Myanmar Engineering Council Professional Engineer (PE) credential?

Under MEngC Notification No. 6/2016, candidates must hold a recognized Bachelor of Engineering (B.E.) degree and have at least 15 years of relevant engineering experience. Progression typically requires prior registration as a Registered Engineer (RE) or Registered Senior Engineer (RSE), completion of 30 hours of professional development training (PDP), passing written examinations (PAWE), submitting a 2,000–4,000-word PECR report, and passing a panel interview with project presentation.

What is the structure of the MEngC PE Part-I Electrical (Building Services) examination?

The current Electrical (B.S) P.E. Part-I Day-2 outline consists of a 2-hour closed-book morning session setting 24 questions (answer 20) and a 2-hour open-book afternoon session setting 12 questions (answer 10). The morning uses MCQ and other formats; the afternoon uses problem solving and other formats. The published route also has Day-1, subject to route exemptions.

Which official codes and reference standards govern the Electrical Building Services assessment?

The 2024 official MEngC outline names MNBC 2020, the IET Wiring Regulations, CP 5, SS 555, HPBC Electrical Guidelines, and temporary electrical power supply guidance. Myanmar's Ministry of Construction has since published MNBC 2025, so candidates should check current MEngC notices for the version expected at their sitting.

Is this practice question bank an official MEngC examination or an independent study resource?

This is an independent English-language MCQ study adaptation developed by OpenExamPrep for the published Electrical (Building Services) Day-2 knowledge scope. It is not an official translation, format simulation, or substitute for the afternoon problem-solving section, Part-II, the PECR competency report, project presentation, or oral panel interview.