NABTEB Electrical Installation 2021 Past Questions & Answers
Practise all 11 NABTEB Electrical Installation questions from the 2021 exam, each with a worked answer and explanation. Free CBT-format practice on web, iOS and Android.
8 questions from the 2021 NABTEB Electrical Installation paper
Try them on paper first. The correct options and worked answers are in the app.
1.In a ring final circuit, the maximum floor area served should not exceed:
- A.50 m²
- B.100 m²
- C.150 m²
- D.200 m²
2.An earth continuity test measures the:
- A.Voltage between earth and neutral
- B.Resistance of the protective conductor from the consumer unit to each point
- C.Current flowing to earth during normal operation
- D.Insulation resistance between live and earth
3.Which type of cable is most suitable for underground installation without additional mechanical protection?
- A.PVC twin and earth
- B.Mineral insulated cable
- C.Steel wire armoured (SWA) cable
- D.Flexible cord
4.Three resistors of 10Ω, 20Ω, and 30Ω are connected in parallel. What is the total resistance?
- A.60 Ω
- B.5.45 Ω
- C.20 Ω
- D.6.67 Ω
5.An RCD operates by detecting:
- A.Overcurrent in the circuit
- B.Overvoltage in the circuit
- C.An imbalance between the line and neutral currents
- D.A rise in temperature of the cable
6.When stripping cable insulation for termination, the correct tool to use is:
- A.A sharp knife cutting towards the body
- B.A cable stripping tool appropriate for the cable type
- C.Side cutters to tear the insulation
- D.Pliers to pull the insulation off
7.A circuit diagram differs from a wiring diagram in that it shows:
- A.The physical layout of components
- B.The electrical connections and function of the circuit using standard symbols
- C.The exact cable routes in the building
- D.Only the protective devices
8.When terminating an SWA cable, the armour wires must be:
- A.Cut flush with the outer sheath
- B.Folded back and secured under the gland cone
- C.Left loose inside the enclosure
- D.Insulated with PVC tape
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Sign up to see answersAbout the 2021 NABTEB Electrical Installation paper
These are real NABTEB Electrical Installation questions from the 2021 exam, sourced from the official paper. Paper 1 (Objective) + Paper 2 (Essay) per subject. Practising a specific year shows you the style and difficulty the examiners set that year — useful for spotting recurring topics across 2005–2024.
Preparing for the NABTEB Electrical Installation 2021 theory paper
The 2021 NABTEB Electrical Installation paper has an objective section and a theory (essay) section — and both test the same syllabus. ExamPadi gives you the objective questions in CBT format with worked answers, the most efficient way to master the topics and the recall the theory paper rewards too.
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NABTEB Electrical Installation 2021 — frequently asked
How many NABTEB Electrical Installation 2021 past questions are there?
ExamPadi has 11 NABTEB Electrical Installation questions from the 2021 exam, each with a worked answer and explanation.
Are the 2021 NABTEB Electrical Installation answers included?
Yes — every question has a worked answer, not just the correct option.
Does this help with the NABTEB Electrical Installation 2021 theory paper too?
ExamPadi gives you the objective (multiple-choice) NABTEB Electrical Installation questions, each with a worked answer. The objective and theory papers test the same syllabus, so drilling these questions is also strong preparation for the 2021 theory paper.
Can I download the NABTEB Electrical Installation 2021 questions and answers as a PDF?
You can practise every 2021 NABTEB Electrical Installation question and answer free on the ExamPadi web and mobile apps, and the mobile app saves them for offline study — a faster, always-corrected alternative to a static PDF download.
Can I practise NABTEB Electrical Installation 2021 free?
Yes. The free tier gives 20 questions per day across any subject and year. Pro removes the cap and unlocks full timed mock exams.