Class 2 (2nd Engineer) MEP 📅 Jul 2018

Exam Question

(a) Values of some main engine exhaust temperatures displayed in the engine control room differ from those displayed on the engine for the same cylinders.

(i) Explain how it may be determined which readings are inaccurate

(ii) State possible reasons for these inaccurate readings

(iii) Explain how the location of the faults may be detected

(b) State the periodic checks which should be carried undertaken to ensure that remote engine instrumentation is readings accurately

Reference Answer

(a) To ascertain which readings are correct, a comparison would be made between the control room display and the local display. The simplest way to find the correct temperature is to change the local thermometer with a new one. This new reading would be used as the datum to check the control room display.
A portable laser thermometer can also be used to check the local temperature and determine the correctness of readings
(b) Possible reasons for inaccurate readings are:
Vibrations

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