Class 2 (2nd Engineer) MEKM 📅 Jun 2019

Exam Question

With reference to bridge control of a large slow speed propulsion engine:

(a) How is starting and reversing achieved

(b) Investigate and propose remedial action if the engine

(i) Fails to turn on air.

(ii) Turns on air but fails to fire on fuel.

(iii) Fails to reverse.

Reference Answer

(a) Starting and Reversing from Bridge Control
Starting:
When the telegraph is moved to the desired command, e.g., Dead Slow Ahead from STOP , a solenoid valve in the control system is energized.
This admits control air to the Ahead switch , which directs air to pneumatic cylinders fitted on each fuel pump. These cylinders shift the fuel pump roller to the “ahead firing” position.

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