Question 1
What is the standard analogue current signal range used to transmit process variables in the instrumentation trade?
Correct Answer:
4-20 mA
Question 2
Why does the standard current loop use 4 mA rather than 0 mA to represent 0% of the measured range?
Correct Answer:
To provide a live zero that allows broken-loop detection
Question 3
A pressure transmitter is ranged 0-250 kPa with a 4-20 mA output. What output current corresponds to an applied pressure of 125 kPa?
Correct Answer:
12 mA
Question 4
What does the HART protocol superimpose on the 4-20 mA analogue signal to provide digital communication?
Correct Answer:
A frequency-shift-keyed (FSK) digital signal averaging to zero
Question 5
Which temperature sensor produces a small DC millivolt signal based on the Seebeck effect at the junction of two dissimilar metals?
Correct Answer:
Thermocouple
Question 1
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About this Exam

Prepare with the Instrument Mechanician Trade Test Practice Questions - South Africa Artisan Trade Test - Instrument Mechanician Exam practice quiz. This question bank includes 100 questions covering flow, pressure, control, transmitter, and level. Use it to review important concepts, identify knowledge gaps, and build confidence for the related exam, course, or assessment.

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Instrument Mechanician Trade Test Practice Questions - South Africa Artisan Trade Test - Instrument Mechanician Exam

This practice set contains 100 questions from the matching question bank and focuses on flow, pressure, control, transmitter, and level. Work through each question carefully, review the provided solutions, and revisit topics that need more study before your next attempt.

This is an independent study resource intended for practice and review; it is not an official examination or an endorsement by any organization named in the title.

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