Free mock exam
Control Systems — Instrumentation Practice
Free topic-focused mock exam: all 28 questions on Control Systems, 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
01In a PID controller, what does the 'P' term represent?
- AProcess
- BPower
- CProportional
- DPressure
Why: The 'P' in PID stands for Proportional, which provides a control output proportional to the error.
02What does integral (I) action do that proportional action alone cannot?
- AEliminates measurement noise
- BRemoves the steady-state offset
- CAnticipates the rate of change
- DReduces overshoot on every loop
Why: Proportional-only control leaves an offset whenever the load changes. Integral action keeps moving the output for as long as any error remains, so it drives the offset to zero. It does not filter noise, it tends to add overshoot rather than remove it, and anticipating the rate of change is derivative action.
03What is the purpose of derivative (D) action in a PID controller?
- ATo filter measurement noise out of the process variable
- BTo anticipate future error and reduce overshoot
- CTo provide an output directly proportional to the current error
- DTo eliminate steady-state offset from the process variable
Why: Derivative action anticipates future error based on the rate of change, helping to reduce overshoot and improve stability.
Common questions
Is the Control Systems 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.