Class 4 (4th Engineer) MEKM 📅 Oct 2022

Exam Question

(a) Values of some main engine exhaust temperatures displayed in the engine control room console differ from those displayed locally on the engine for the same cylinders. (9)

(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 undertaken to ensure that remote engine instrumentation is working accurately. (7)

Reference Answer

### (a) Discrepancies in Main Engine Exhaust Temperatures
This situation involves a discrepancy between the local temperature reading at the cylinder head and the remote reading displayed in the Engine Control Room (ECR). A systematic approach is required to identify the source of the error.
#### (i) Determining which readings are inaccurate
To ascertain which reading is correct, a reliable third-party measurement, or datum, must be established. The following methods are employed:

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