NABTEB Electrical Installation 2023 Past Questions & Answers
Practise all 11 NABTEB Electrical Installation questions from the 2023 exam, each with a worked answer and explanation. Free CBT-format practice on web, iOS and Android.
8 questions from the 2023 NABTEB Electrical Installation paper
Try them on paper first. The correct options and worked answers are in the app.
1.What is the peak voltage of a 230V RMS AC supply?
- A.230 V
- B.325.3 V
- C.162.6 V
- D.460 V
2.Discrimination between protective devices means that:
- A.All devices trip simultaneously during a fault
- B.Only the device nearest to the fault operates, leaving other circuits unaffected
- C.The main switch always trips first
- D.No device operates during an earth fault
3.When sizing cables for an industrial installation, which factor does NOT need to be considered?
- A.Ambient temperature
- B.Grouping with other cables
- C.The colour of the cable sheath
- D.Type of protective device
4.A single-line diagram (SLD) is used primarily to show:
- A.Detailed wiring connections between components
- B.The overall power distribution path from source to loads in simplified form
- C.The physical dimensions of the installation
- D.Only the lighting circuit layout
5.Polarity testing verifies that:
- A.The supply voltage is correct
- B.Single-pole switches are connected in the live conductor and not the neutral
- C.The earth resistance is adequate
- D.The insulation is intact
6.In a DC series motor, what happens to the speed when the load is removed?
- A.Speed remains constant
- B.Speed decreases gradually
- C.Speed increases dangerously and may damage the motor
- D.The motor stops immediately
7.If a 1200 lumen lamp illuminates a surface area of 4 m², what is the average illuminance?
- A.4800 lux
- B.300 lux
- C.1200 lux
- D.150 lux
8.A resin-filled joint box is used for:
- A.Temporary connections during testing
- B.Permanent waterproof joints in underground or exposed cable runs
- C.Indoor lighting connections only
- D.Replacing fuses
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Sign up to see answersAbout the 2023 NABTEB Electrical Installation paper
These are real NABTEB Electrical Installation questions from the 2023 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 2023 theory paper
The 2023 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 2023 — frequently asked
How many NABTEB Electrical Installation 2023 past questions are there?
ExamPadi has 11 NABTEB Electrical Installation questions from the 2023 exam, each with a worked answer and explanation.
Are the 2023 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 2023 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 2023 theory paper.
Can I download the NABTEB Electrical Installation 2023 questions and answers as a PDF?
You can practise every 2023 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.
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Yes. The free tier gives 20 questions per day across any subject and year. Pro removes the cap and unlocks full timed mock exams.