Class 2 (2nd Engineer) MEP 📅 Feb 2025

Exam Question

(a) Sketch and describe a pneumatic control system for controlling temperature of main engine lubricating oil at outlet of the cooler (6)

(b) Explain why air supplied to a pneumatic control system must be free from dust and water (4)

(d) State the possible consequences if the air supply is contaminated (2)

Reference Answer

(a) Pneumatic control system for controlling temperature of lubricating oil at outlet of the cooler:
The arrangement is as shown in figure.
Lubricating oil is pumped from the sump via a filter to a 3-way valve fitted in the line.
This valve is controlled by a temperature sensor located at the inlet to the main engine.

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