MEK Exit Exam • Set 2 Question 7 of 30

What type of valve is installed on cylinder heads to protect against excessive combustion pressure?

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Direct Answer

Option C: Cylinder Safety Relief Valve

Marine Diesel Engine classification rules mandate spring-loaded cylinder safety relief valves on every combustion chamber. These valves automatically lift and reseat to vent dangerous overpressure caused by abnormal combustion, safeguarding structural integrity without total pressure loss.

All Options

A

Starting air valve

B

Fuel injection valve

C

Cylinder Safety Relief Valve (Correct Answer)

D

Indicator cock

Detailed Explanation & Context

Marine Diesel Engine classification rules mandate spring-loaded cylinder safety relief valves on every combustion chamber. These valves automatically lift and reseat to vent dangerous overpressure caused by abnormal combustion, safeguarding structural integrity without total pressure loss.

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?