Small Vessel EOOW 060-01 Marine Diesel Engineering Exam

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Explain why relief valves may be fitted to diesel engine crankcases.

To prevent excessive pressure buildup inside the crankcase.

Outline the circumstances that may cause relief valves in diesel engine crankcases to operate.

Excessive pressure due to combustion blow-by or abnormal engine operation.

State a safety detection system that may be fitted to diesel engine crankcases.

Pressure sensors or alarms.

Describe what is meant by the term microbe in the context of microbial infestation of distillate fuel.

A microscopic organism, such as bacteria or fungi. Signup and view all the answers

State what microbes need to survive in distillate fuel.

Water and nutrients. Signup and view all the answers

Describe the possible diesel engine problems caused by microbial infestation of distillate fuel.

Clogged filters, corrosion, and fuel degradation. Signup and view all the answers

Describe how microbial infestation of distillate fuel can be identified.

Through visual inspection, microbial testing kits, or fuel analysis. Signup and view all the answers

Explain how the lubricating oil of a diesel engine may become contaminated with water.

Through condensation, leaks, or improper maintenance practices. Signup and view all the answers

Outline the problems that water in an engine oil may cause.

Reduced lubricating properties, corrosion, and accelerated wear. Signup and view all the answers

Explain the term 'atomisation' with reference to the combustion of fuel.

Atomisation refers to the process of breaking down fuel into small particles or droplets to mix better with air for efficient combustion. Signup and view all the answers

Describe the possible causes of high bearing temperatures in diesel engines.

Lack of lubrication, overloading, misalignment, or bearing damage. Signup and view all the answers

Explain the procedure to be adopted if high bearing temperatures are detected in a diesel engine.

Immediate shutdown, inspection, and rectification of the root cause. Signup and view all the answers

What is the purpose of the volute casing in main engine turbochargers?

The volute casing helps in converting the high-velocity exhaust gas energy into pressure energy before it enters the turbine blades. Signup and view all the answers

Explain the difference between in-line and Vee type engines.

In-line engines have cylinders arranged in a straight line, while Vee type engines have cylinders arranged in a V-shape. Signup and view all the answers

State the advantages of Vee type engines.

Vee type engines are more compact, have better balance, and allow for better power output compared to in-line engines. Signup and view all the answers

What factors influence the terms explained in the combustion of fuel?

Factors like air-fuel ratio, fuel quality, combustion chamber design, and engine operating conditions influence atomisation, penetration, and compression ratio. Signup and view all the answers

Explain the purpose of the diffuser in main engine turbochargers.

The diffuser slows down the high-velocity air from the compressor to convert kinetic energy into pressure energy before entering the engine. Signup and view all the answers

Sketch two Vee engine bottom end arrangement types.

Sketches will vary but should show the different configurations of crankshafts, connecting rods, and pistons in Vee engine bottom end arrangements. Signup and view all the answers