Testing Equipment & Measuring Instruments is one of 9 topics in the Grade 11 Electrical Technology CAPS syllabus, covered across 3 lessons on Study Vault. Below are real practice questions from this topic with full worked answers.
Sample practice questions
Easy
1. What is the main use of a line tester?
A fast, basic check for the presence of voltage at a point before work begins
Measuring precise current values on a live circuit
Measuring power factor of an AC load
Measuring resistance of a de-energised component
Answer: A fast, basic check for the presence of voltage at a point before work begins — A line tester gives a fast, basic go/no-go check for the presence of voltage before work begins on a circuit, though it does not give a precise voltage reading.
Easy
2. What key advantage does a clamp meter have over a standard multimeter when measuring current?
It measures current without needing to break the circuit and insert the meter in series
It gives a more precise voltage reading than a multimeter
It can measure resistance on a live circuit safely
Clamp meters cannot measure current at all, only voltage
Answer: It measures current without needing to break the circuit and insert the meter in series — A clamp meter measures current non-invasively by clamping around a conductor and using the magnetic field the current produces, unlike a multimeter which must be wired in series.
Medium
3. Name the instrument that measures how closely the current and voltage waveforms of an AC circuit are in phase with each other.
Answer: power factor meter — A power factor meter measures the power factor of an AC circuit directly, giving a reading of how closely current and voltage are in phase.
