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Module 1 Test: Introduction to Basic Electrics

20 multiple-choice questions on everything in the Module 1 notes (Day 1 and Day 2). Pick one answer per question, then press Mark my test to see your score, the right answers and where to revise.

20 questions·One correct answer each·Aim for 13 / 20 (65%), about the real exam pass mark·Calculator allowed

What is the UK nominal single-phase supply voltage (U₀)?
A. 110 V B. 230 V C. 240 V D. 400 V
Three resistors of 10 Ω, 20 Ω and 30 Ω are connected in series across 230 V. What current flows?
A. 7.67 A B. 23 A C. 1.28 A D. 3.83 A
A 20 Ω and a 30 Ω resistor are connected in parallel. What is the total resistance?
A. 12 Ω B. 25 Ω C. 50 Ω D. 0.08 Ω
In a parallel circuit, which quantity is the same across every branch?
A. Current B. Resistance C. Voltage D. Power
A 3 kW immersion heater runs on 230 V. What current does it draw?
A. 69.00 A B. 7.67 A C. 10.00 A D. 13.04 A
What is 0.5 MΩ expressed in kilohms?
A. 5 kΩ B. 50 kΩ C. 500 kΩ D. 5000 kΩ
What is the frequency of the UK mains supply?
A. 50 Hz B. 60 Hz C. 100 Hz D. 25 Hz
A transformer has 400 turns on the primary at 230 V and 20 turns on the secondary. What is the secondary voltage?
A. 4.6 V B. 11.5 V C. 20 V D. 4600 V
On a UK three-phase supply, what is the voltage between two line conductors?
A. 115 V B. 230 V C. 400 V D. 460 V
Which of these is statutory, so you can be prosecuted for breaking it?
A. The Electricity at Work Regulations 1989 B. The Electrician's Guide to the Building Regulations C. BS 7671 (the Wiring Regulations) D. The On-Site Guide
Under Part P, which of these jobs is notifiable?
A. Replacing a cable like-for-like on the same route B. Replacing a damaged socket front C. Adding a socket to an existing ring in a bedroom D. Installing a new circuit for a cooker
Which room is a special location under BS 7671 Part 7?
A. A bedroom with an en-suite door B. A room containing a bath or shower C. A garage with a consumer unit D. A kitchen in England
What is the typical maximum external earth fault loop impedance (Ze) for a TN-C-S (PME) supply?
A. 200 Ω B. 0.35 Ω C. 0.8 Ω D. 21 Ω
On a TT system, who is responsible for providing the earth electrode?
A. The local authority B. The DNO C. The energy supplier D. The client
Which single device protects against overload, short circuit AND earth faults?
A. Circuit breaker (CB) B. RCD C. RCBO D. SPD
A B32 circuit breaker must trip within 0.4 s at what current?
A. 160 A B. 320 A C. 32 A D. 46.4 A
Which formula gives the total earth fault loop impedance, Zs?
A. Zs = Ze + (R1 + R2) B. Zs = Ze × (R1 + R2) C. Zs = (R1 + R2) ÷ Ze D. Zs = Ze − (R1 + R2)
What does an AFDD detect?
A. Overloads on a ring final circuit B. Transient overvoltages from lightning C. Arc faults caused by loose or poor connections D. An imbalance between line and neutral current
Approved Document M gives what height range for switches and sockets above finished floor level?
A. 600–1400 mm B. 150–1000 mm C. 300–1500 mm D. 450–1200 mm
Under Approved Document A, how deep can a HORIZONTAL chase in a wall be?
A. No more than ⅓ of the wall thickness B. No more than ⅙ of the wall thickness C. No more than 50 mm D. Any depth if the cable is in conduit

Unofficial practice questions written from the Module 1 study notes, not from the awarding body's exam. Always check against your course books and BS 7671.

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