Free mock exam
Wiring & Installation — Instrumentation Practice
Free topic-focused mock exam: all 28 questions on Wiring & Installation, drawn from the wider Instrumentation bank. 35-minute timer, 70% to pass, worked explanation on every question. Use this when you've taken the full mock once and want to drill the topics you got wrong.
- Questions
- 28
- Time limit
- 35 min
- Pass mark
- 70% · 20/28
- Question bank
- 28
Free, no sign-up. Retake as many times as you like — the questions are reshuffled, with the answer order changed.
Sample questions
01What is the main advantage of twisted pair cable?
- AHigher temperature rating
- BImproved noise immunity
- CGreater flexibility
- DLower cost
Why: Twisted pair cable reduces electromagnetic interference by cancelling out induced noise in both conductors.
02What is the recommended shield connection for a 4-20mA signal cable?
- AConnect shield at both ends
- BConnect shield at receiver end only
- CConnect shield at transmitter end only
- DLeave shield unconnected
Why: Earth the screen at one end only, normally the host (receiver) end, so no current loop forms through the screen between two earth points at different potentials. The single earthed screen still guards against capacitive coupling.
03What is IS barrier in instrumentation?
- AImpedance Stabiliser unit
- BIsolation Switch
- CIntrinsic Safety barrier
- DInsulated Signal Separator
Why: An Intrinsic Safety barrier limits energy to safe levels for use in potentially explosive atmospheres.
Common questions
Is the Wiring & Installation mock exam free?
Yes, it is free with no sign-up needed. Questions are pulled at random from a substantial bank, with a worked explanation on every question after you submit.
Can I retake the mock exam?
Yes. Every attempt picks a different random selection and reshuffles the options, so each retake gives you genuinely new questions. No limit on retakes.
Does this count as a qualification?
No. This is independent practice material and does not award a qualification, card or certificate. Where a subject has a formal qualification or card, you gain it through an approved provider.