Class 2 (2nd Engineer) MET 📅 Feb 2024

Exam Question

(a) Sketch a magnetic overload device incorporating a dashpot and explain how the current and time setting of the device may be varied. (8)

(b) With the aid of a sketch, outline the essential feature of a three stage "Preferential tripping" scheme for the main generators of a ship. (8)

Reference Answer

(b) Three-stage preferential tripping:
Preferential trips operate after a fixed time delay, causing non-essential loads to be shed.
When the generator load reaches 110%, preferential Trip comes into operation as follows
First Stage Preferential Tripping (PT1):

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