Electro-Technical Competence

Marine Sensors: Principles and Troubleshooting

This test is designed for Electro-Technical Officers (ETOs), Marine Engineers, and cadets who want to test and improve their knowledge of sensors used onboard ships. It includes questions on pressure transmitters, pressure switches, Pt100/Pt1000 temperature sensors, thermocouples, temperature switches, and thermostats. Topics cover their operating principles, 4–20 mA signals, wiring diagrams, basic calculations, and fault diagnosis.

Питань 12

Час 9 min

Мова Англійська

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Питання 1

Which standardized thermocouple type uses Chromel and Alumel conductors?

A Type J.

B Type N.

C Type K.

D Type T.

Питання 2

What is the primary function of an electronic pressure transmitter?

A Change a relay contact at a fixed pressure threshold.

B Display pressure mechanically without an electrical signal.

C Limit pressure by opening a mechanical relief valve.

D Convert measured pressure into a corresponding electrical output signal.

Питання 3

What is the approximate nominal resistance of an IEC 60751 Pt100 at −20°C?

A 92.16 Ω.

B 80.31 Ω.

C 96.09 Ω.

D 100.00 Ω.

Питання 4

What is the main function of an ON/OFF thermostat in an electric heating system?

A Protect the heater against electrical overload current.

B Switch the heater on and off to maintain a selected temperature.

C Continuously vary the heater supply voltage.

D Convert the sensing temperature directly into 4–20 mA.

Питання 5

What is the approximate nominal resistance of an IEC 60751 Pt100 at 100°C?

A 138.51 Ω.

B 130.90 Ω.

C 142.29 Ω.

D 146.07 Ω.

Marine Sensors: Principles and Troubleshooting

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