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Key Facts: C&G 2365-03 Level 3 Exam

100

Practice Questions

OpenExamPrep

Level 3

Advanced Diploma

City & Guilds

Multiple

e-volve Unit Exams

City & Guilds

~60%

Typical MCQ Pass Mark

City & Guilds

BS 7671

Wiring Regulations Applied

IET/BSI

6 units

Knowledge Areas

City & Guilds 2365-03

The City & Guilds 2365-03 Level 3 Diploma in Electrical Installations (Buildings & Structures) is the advanced underpinning-knowledge qualification for UK electricians, building on the Level 2 (2365-02) Diploma. It is assessed through several City & Guilds e-volve online multiple-choice unit exams (Units 301, 303, 304 and 305, typically 27-60 questions each with around 60% to pass), alongside written papers, a design assignment and practical assessments, rather than one single exam. Content covers advanced electrical principles and science (AC theory, transformers, motors and power factor), electrical systems design to BS 7671 (cable calculations, correction factors, the adiabatic equation, Zs and protective devices), inspection, testing and commissioning, fault diagnosis and rectification, environmental technology systems, and the electrotechnical industry. This free prep includes 100 research-based practice questions with explanations and an AI tutor.

Sample C&G 2365-03 Level 3 Practice Questions

Try these sample questions to review concepts for the C&G 2365-03 Level 3 exam. Each question includes a detailed explanation. Start the interactive quiz above for the full 100+ question experience with AI tutoring.

1A single-phase transformer has 800 primary turns and 200 secondary turns. If the primary is supplied at 230 V, what is the approximate secondary voltage?
A.920 V
B.57.5 V
C.115 V
D.460 V
Explanation: For an ideal transformer, Vp/Vs = Np/Ns. So Vs = Vp x (Ns/Np) = 230 x (200/800) = 230 x 0.25 = 57.5 V. With fewer secondary turns the transformer steps the voltage down.
2A four-pole three-phase induction motor is supplied at 50 Hz. What is its synchronous speed?
A.1000 rev/min
B.1500 rev/min
C.3000 rev/min
D.750 rev/min
Explanation: Synchronous speed Ns = (120 x f) / p, where p is the number of poles. Ns = (120 x 50) / 4 = 6000 / 4 = 1500 rev/min. The rotor runs slightly below this due to slip.
3An induction motor has a synchronous speed of 1500 rev/min and runs at a full-load speed of 1440 rev/min. What is the percentage slip?
A.6%
B.4%
C.2%
D.10%
Explanation: Slip = ((Ns - Nr) / Ns) x 100 = ((1500 - 1440) / 1500) x 100 = (60 / 1500) x 100 = 4%. Typical full-load slip for a standard induction motor is in the 3-5% region.
4In a purely inductive AC circuit, what is the phase relationship between current and voltage?
A.Current and voltage are in phase
B.Current lags the voltage by 90 degrees
C.Current leads the voltage by 90 degrees
D.Current lags the voltage by 45 degrees
Explanation: In a purely inductive circuit the current lags the applied voltage by 90 degrees because the inductor opposes the change in current. The memory aid CIVIL gives 'in an Inductor, current (I) lags voltage (V)'.
5A coil has a resistance of 6 ohms and an inductive reactance of 8 ohms. What is its impedance?
A.14 ohms
B.10 ohms
C.2 ohms
D.48 ohms
Explanation: In a series R-L circuit, impedance Z = square root of (R squared + XL squared) = square root of (6^2 + 8^2) = square root of (36 + 64) = square root of 100 = 10 ohms. R, XL and Z form a right-angled impedance triangle.
6For the circuit with R = 6 ohms and Z = 10 ohms, what is the power factor?
A.0.8 lagging
B.0.6 lagging
C.1.0
D.0.6 leading
Explanation: Power factor = cos(phi) = R / Z = 6 / 10 = 0.6. Because the circuit is inductive (R-L), the power factor is lagging as the current lags the voltage.
7Why is a low (poor) power factor undesirable for an industrial consumer?
A.It increases the supply voltage
B.It increases the current drawn for a given real power, raising losses and demand charges
C.It reduces the kVA rating required
D.It improves the efficiency of transformers
Explanation: For a given real power (kW), a lower power factor means a higher apparent power (kVA) and therefore a higher current. This increases I-squared-R cable losses, requires larger conductors and switchgear, and often attracts reactive-power demand charges from the supplier.
8Which component is normally connected in parallel with an inductive load to correct a lagging power factor?
A.A series inductor
B.A capacitor
C.An additional resistor
D.A step-up transformer
Explanation: A capacitor draws a leading current that cancels part of the lagging reactive current of the inductive load, raising the overall power factor toward unity. Capacitor banks are the standard means of power-factor correction.
9A three-phase balanced load draws a line current of 20 A at 400 V line voltage with a power factor of 0.85. What is the approximate real power consumed?
A.11.8 kW
B.13.9 kW
C.6.8 kW
D.8.0 kW
Explanation: For a balanced three-phase load, P = square root of 3 x VL x IL x cos(phi) = 1.732 x 400 x 20 x 0.85 = approximately 11 778 W, or about 11.8 kW. The square root of 3 factor links line and phase quantities in a three-phase system.
10In a star (wye) connected three-phase system, how does the line voltage relate to the phase voltage?
A.Line voltage equals phase voltage
B.Line voltage equals square root of 3 times the phase voltage
C.Line voltage equals 3 times the phase voltage
D.Line voltage equals phase voltage divided by square root of 3
Explanation: In a star connection, VL = square root of 3 x Vph, while the line current equals the phase current. This is why a 230 V phase voltage gives a 400 V line voltage (230 x 1.732 = 400).

About the C&G 2365-03 Level 3 Exam

The City & Guilds 2365-03 Level 3 Diploma in Electrical Installations (Buildings & Structures) is the advanced theory qualification for trainee electricians in the UK. It builds on Level 2 with advanced electrical science, BS 7671 systems design, inspection and testing, fault diagnosis, and environmental technology, assessed through e-volve online multiple-choice unit exams, written papers, assignments and practical work.

Exam sponsor: City & Guilds. The requirements and fees below concern the certification or admission exam, separate from our free practice resources.

Assessment

Multiple e-volve online multiple-choice unit exams (Units 301, 303, 304, 305) plus written papers, design assignments and practical assessments; pass marks are typically around 60% per MCQ unit

Time Limit

75-120 minutes per unit exam

Passing Score

Around 60% per multiple-choice unit exam (varies by unit)

Exam / Certification Fees

Included in the training provider's course fee (typically GBP 1,800-3,000 overall)

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.

25%

Electrical Principles & Science (Unit 302)

Advanced AC theory, impedance and power factor, single- and three-phase power, transformers and turns ratio, induction and DC machines, star-delta starting, and machine efficiency

20%

Electrical Systems Design (Unit 305)

Circuit design to BS 7671, cable selection and correction factors, voltage drop, the adiabatic equation and CPC sizing, maximum demand and diversity, Zs, and protective device selection

18%

Inspection, Testing & Commissioning (Unit 304)

Safe isolation and GS38, the dead and live test sequence, continuity, insulation resistance, polarity, Zs, RCD testing, prospective fault current, certification and functional testing

15%

Fault Diagnosis & Rectification (Unit 303)

Logical fault-finding, open-circuit, short-circuit, earth and high-resistance faults, RCD nuisance tripping, single phasing, live-working precautions and re-testing after rectification

14%

Environmental Technology Systems (Unit 301)

Solar PV and inverters, solar thermal, ground- and air-source heat pumps, micro-wind, micro-CHP, biomass, rainwater harvesting, greywater recycling, MCS and the Smart Export Guarantee

8%

Electrotechnical Industry & Communication (Unit 308)

EAWR 1989, Part P, the status of BS 7671, industry bodies, drawings and graphical symbols, career pathways and the AM2, and competent person schemes

Preparing for the C&G 2365-03 Level 3 Exam

What You Need to Know

  • Passing score: Around 60% per multiple-choice unit exam (varies by unit)
  • Assessment: Multiple e-volve online multiple-choice unit exams (Units 301, 303, 304, 305) plus written papers, design assignments and practical assessments; pass marks are typically around 60% per MCQ unit
  • Time limit: 75-120 minutes per unit exam
  • Exam / certification fees: Included in the training provider's course fee (typically GBP 1,800-3,000 overall) Official sources

Using Our Practice Resources

  • Work through all 100 available questions
  • Review every answer and explanation
  • Track weak areas and revisit them
  • Use our AI tutor for tough concepts

C&G 2365-03 Level 3: Suggested Study Strategy

1Weight your study toward electrical principles (Unit 302) and systems design (Unit 305) — they carry the most demanding calculations
2Practise BS 7671 cable calculations: Ib <= In <= Iz, correction factors Ca/Cg/Ci/Cc, voltage drop (mV/A/m), and the adiabatic equation S = root(I^2 t)/k with k = 115 for 70 C copper
3Memorise the dead and live test sequence and the BS 7671 test values: 500 V DC insulation resistance with a 1 megohm minimum, and 0.4 s disconnection for 32 A TN final circuits
4Know the EICR classification codes (C1 immediate danger, C2 potentially dangerous, C3 improvement recommended, FI further investigation)
5For the environmental technology unit, learn each micro-renewable's principle and the difference between MCS certification and the Smart Export Guarantee
6Complete all 100 practice questions and review every miss with the AI tutor before sitting each e-volve unit exam

Frequently Asked Questions

How is the City & Guilds 2365-03 Level 3 Diploma assessed?

The 2365-03 is assessed through several City & Guilds e-volve online multiple-choice unit exams (Units 301, 303, 304 and 305), plus written papers, a design assignment and practical assessments. There is no single combined exam; each unit is assessed separately, with MCQ pass marks typically around 60%.

How many questions are in each 2365-03 unit exam?

It varies by unit. The e-volve multiple-choice exams typically contain between 27 and 60 questions and run for 75 to 120 minutes. For example, the environmental technology MCQ has around 27 questions while the systems design and other unit exams can be longer.

What is the difference between the 2365 Level 2 and Level 3 diplomas?

Level 2 (2365-02) covers foundational health and safety, basic electrical science, installation methods and earthing. Level 3 (2365-03) is more advanced, adding AC theory, transformers and motors, BS 7671 systems design and cable calculations, inspection and testing, fault diagnosis, and environmental technology systems.

Do I need the 2365 Level 3 to become a qualified electrician?

The 2365-03 provides the Level 3 underpinning knowledge, but full electrician status normally also requires a workplace NVQ (or apprenticeship) and the AM2/AM2S end-point assessment. Together these lead to the ECS gold card.

Is BS 7671 used throughout the 2365 Level 3?

Yes. BS 7671 (the IET Wiring Regulations) underpins the systems design, inspection and testing units, including cable selection, correction factors, the adiabatic equation, Zs and disconnection times. The current edition is the 18th Edition (BS 7671:2018+A2:2022).

Is this free 2365 Level 3 practice as good as paid prep?

Our 100 practice questions span every 2365-03 knowledge unit, with a teaching explanation for every answer plus free daily AI tutor interactions. All content is free forever and updated for 2026, using correct UK terminology and BS 7671 references.