4A practice exam › Unit A-9
71 practice questions in this unit. Each practice set pulls 20 at a time, so you keep seeing new questions as you go.
What this unit covers: Measuring pressure, level, flow and temperature; transmitters, controllers, actuators; boiler programming controls.
Exam theme: Electrical, controls and communication. Commonly reported share of the 100-question 4A exam: about 10 questions (unofficial; SOPEEC and ABSA do not publish per-unit counts). See the 4A exam breakdown.
Original exam-style questions written to the public syllabus, from our free public sample. They are not questions from a real exam.
1. An open-loop control system is also referred to by which alternative name?
Answer: C. An open loop is a non-feedback control system: it does not measure the result and send that measurement back. A closed loop is a feedback control system, because it uses a measurement of the process to adjust the output.
← A-8: Basic Concepts in Electrotechnology · A-10: Fundamental Industrial Communication Skills →
Free worksheet
8 multiple choice strategies used on every SOPEEC paper, on one printable page. Two minutes to read, and it travels well to the exam room.
Here is your worksheet:
Want a real look at your weak spots? Try 20 free questions, no signup.
Free. No spam. Unsubscribe any time.