Class 1 (Chief Engineer) Engineering Management 📅 Nov 2023

Exam Question

(a) Illustrate mean piston speed and its significance on consumption of F.O. (5)

(b) Explain how mean piston speed is related to rpm and ideal combustion. (5)

(c) After joining an old ship as Chief Engineer, formulate a methodology by which you can ascertain maximum F.O. viscosity desired mean piston speed. (6)

Reference Answer

### (a) Mean Piston Speed and its Significance on Fuel Oil Consumption
**Definition:**
Mean Piston Speed (MPS) is the average speed of the piston as it travels from Top Dead Centre (TDC) to Bottom Dead Centre (BDC) and back within the cylinder. It is a critical design and operational parameter for reciprocating engines.
**Formula:**

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