MEK Exit Exam • Set 2 Question 23 of 30

Purpose of fresh water circulation through diesel engine cylinder is to

✓

Direct Answer

Option B: remove heat of combustion

The primary purpose of circulating fresh water through a diesel engine's cooling system is to absorb and remove the immense heat generated by combustion, thereby maintaining optimal operating temperatures. It does not primarily prevent corrosion or clean exhaust gases.

All Options

A

prevent corrosion

B

remove heat of combustion (Correct Answer)

C

clean exhaust gases

D

lubricate moving part

Detailed Explanation & Context

The primary purpose of circulating fresh water through a diesel engine's cooling system is to absorb and remove the immense heat generated by combustion, thereby maintaining optimal operating temperatures. It does not primarily prevent corrosion or clean exhaust gases.

Relevant Framework: STCW 2010 Manila Amendments • DG Shipping E-Learning & Exit Exam Standards • Marine Engineering Knowledge (MEK).

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Q1 Why is jacket cooling water kept treated with chemical inhibitors in marine diesel engines? Q2 What is the function of the economizer fitted in a ship's main engine exhaust boiler system? Q3 What safety device prevents starting air from entering an engine cylinder when the piston is in motion? Q4 What is the function of an oily water separator (OWS) bilge alarm (15 ppm monitor)? Q5 What causes thermal surging in a marine engine turbocharger? Q6 What is the main advantage of using a variable pitch propeller (CPP) on merchant vessels? Q7 What type of valve is installed on cylinder heads to protect against excessive combustion pressure? Q8 What is the primary function of the stern tube seal assembly? Q9 Why must auxiliary diesel engines be warmed up before applying heavy electrical load? Q10 What is the purpose of an air compressor intercooler?