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100+ Free SOLAS Instrumentation Practice Questions

SOLAS Ireland Electrical Instrumentation Apprenticeship (Phase Exams) practice questions are available now; exam metadata is being verified.

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2026 Statistics

Key Facts: SOLAS Instrumentation Exam

100

Practice Questions

OpenExamPrep

Level 6

NFQ Award (QQI Advanced Certificate Craft)

SOLAS / QQI

4 years

Minimum Apprenticeship Duration

SOLAS

4-20 mA

Analogue Signal Standard

Instrumentation standard

Phases 2, 4, 6

Off-the-Job Training Phases

SOLAS

HSA

Irish Safety Regulator

Health and Safety Authority

The SOLAS Electrical Instrumentation apprenticeship is a four-year QQI Advanced Certificate Craft at NFQ Level 6, regulated by SOLAS and delivered through Ireland's Education and Training Boards and partner colleges. Apprentices alternate off-the-job training phases (Phase 2, 4 and 6) with employer-based on-the-job phases, and are assessed by modular phase theory examinations plus practical skills tests. The syllabus covers process measurement (pressure, temperature, flow and level), control loops and PID, transmitters, sensors and calibration, final control elements and pneumatics, PLCs and electronics, and safety including hazardous areas. This free prep includes 100 research-based practice questions with explanations and an AI tutor.

Sample SOLAS Instrumentation Practice Questions

Try these sample questions to test your SOLAS Instrumentation exam readiness. Each question includes a detailed explanation. Start the interactive quiz above for the full 100+ question experience with AI tutoring.

1What is the standard analogue current signal range used to transmit a process variable in industrial instrumentation?
A.0-10 mA
B.4-20 mA
C.0-5 V DC
D.1-5 mA
Explanation: The 4-20 mA current loop is the universal analogue standard for transmitting process variables. The 4 mA 'live zero' allows a broken wire (0 mA) to be distinguished from a genuine 0% reading, while the current signal is immune to voltage drop over long cable runs.
2A 4-20 mA transmitter is measuring a temperature range of 0-200 degC. What current will it output at 100 degC?
A.8 mA
B.10 mA
C.12 mA
D.16 mA
Explanation: 100 degC is 50% of the 0-200 degC span. The output is 4 mA + (0.50 x 16 mA) = 4 + 8 = 12 mA. The span of the current signal is 16 mA (20 minus 4), so 50% of span equals the midpoint, 12 mA.
3What does the HART protocol allow that a plain 4-20 mA loop does not?
A.It increases the current range to 4-40 mA
B.It superimposes a digital signal on the 4-20 mA analogue signal for two-way communication
C.It converts the signal to a pneumatic 3-15 psi output
D.It removes the need for a power supply in the loop
Explanation: HART (Highway Addressable Remote Transducer) superimposes a low-level FSK digital signal on the standard 4-20 mA analogue current without affecting the analogue value. This allows a handheld communicator or DCS to read diagnostics, ranges, and configuration data over the same two wires.
4Which temperature sensor relies on the change in electrical resistance of a metal (typically platinum) with temperature?
A.Thermocouple
B.RTD (resistance temperature detector)
C.Thermistor with NTC characteristic only
D.Bimetallic strip
Explanation: An RTD measures temperature from the predictable change in electrical resistance of a metal element, usually platinum. The common Pt100 has a resistance of 100 ohms at 0 degC and rises in a near-linear, repeatable manner, giving high accuracy and stability.
5What is the nominal resistance of a Pt100 RTD at 0 degC?
A.10 ohms
B.100 ohms
C.120 ohms
D.1000 ohms
Explanation: A Pt100 is a platinum RTD with a nominal resistance of 100 ohms at 0 degC, which is the origin of its name. Its resistance increases by approximately 0.385 ohms per degC (the standard alpha value for industrial platinum RTDs).
6Why is a 3-wire or 4-wire connection preferred over a 2-wire connection for an RTD?
A.It increases the sensor's measuring range
B.It compensates for the resistance of the connecting lead wires
C.It allows the RTD to generate its own voltage
D.It converts the resistance signal directly to 4-20 mA
Explanation: In a 2-wire RTD the resistance of the lead wires adds directly to the measured resistance, causing an error. The 3-wire connection lets the transmitter cancel out the lead resistance, and the 4-wire (Kelvin) connection eliminates it entirely for the highest accuracy.
7On what physical principle does a thermocouple generate a measurable voltage?
A.The Seebeck effect, where a voltage arises from a temperature difference across a junction of two dissimilar metals
B.The Hall effect from a magnetic field
C.The piezoelectric effect from mechanical strain
D.The photoelectric effect from incident light
Explanation: A thermocouple uses the Seebeck effect: when two dissimilar metals are joined and the junction is at a different temperature from the reference (cold) junction, a small temperature-dependent EMF (millivolts) is produced. Measuring this EMF gives the temperature relative to the reference junction.
8What is the purpose of cold-junction compensation in a thermocouple measurement circuit?
A.To cool the measuring junction below ambient
B.To correct the reading for the temperature of the reference (cold) junction at the instrument terminals
C.To convert millivolts to a pneumatic signal
D.To electrically isolate the thermocouple from earth
Explanation: A thermocouple only measures the temperature difference between the hot (measuring) and cold (reference) junctions. Cold-junction compensation measures the terminal temperature and adds the equivalent EMF so the instrument reports the true absolute temperature of the process.
9Which thermocouple type uses Chromel-Alumel and is the most common general-purpose type?
A.Type J
B.Type K
C.Type T
D.Type R
Explanation: Type K thermocouples use a Chromel (nickel-chromium) positive leg and Alumel (nickel-aluminium) negative leg. They are the most widely used general-purpose type, covering roughly -200 to 1260 degC with good linearity and low cost.
10A pressure transmitter is calibrated for 0-10 bar. What is the measured pressure when its output is 16 mA?
A.6 bar
B.7.5 bar
C.8 bar
D.10 bar
Explanation: 16 mA represents (16-4)/16 = 12/16 = 75% of span. 75% of the 0-10 bar range is 7.5 bar. Always subtract the 4 mA live zero before calculating the percentage of span.

About the SOLAS Instrumentation Practice Questions

Verified exam format metadata for SOLAS Ireland Electrical Instrumentation Apprenticeship (Phase Exams) is pending. The practice questions above remain available while official exam length, timing, passing score, fee, and administrator details are reviewed.