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Small Vessel EOOW 060-01 Marine Diesel Engineering Exam

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Questions and Answers

What is meant by the term 'atomisation' in the combustion of fuel?

Atomisation refers to the process of breaking down the fuel into very fine droplets to increase the surface area for efficient combustion.

What is meant by the term 'penetration' in the combustion of fuel?

Penetration refers to the depth to which the fuel spray can penetrate into the combustion chamber.

What is the compression ratio in an engine?

The compression ratio is the ratio of the volume of the cylinder when the piston is at the bottom of its stroke to the volume when the piston is at the top of its stroke.

What factors influence the atomisation, penetration, and compression ratio in an engine?

The factors that influence these terms include the fuel injection system, combustion chamber design, engine speed, and engine load. Signup and view all the answers

What is the purpose of the volute casing in a turbocharger?

The volute casing in a turbocharger is designed to collect the exhaust gases from the engine and direct them towards the turbine wheel, which drives the compressor. Signup and view all the answers

What is the purpose of the diffuser in a turbocharger?

The diffuser in a turbocharger is designed to slow down the high-speed exhaust gases exiting the turbine, which helps to increase the pressure and efficiency of the turbocharger. Signup and view all the answers

What is the purpose of the nozzle ring in a turbocharger?

The nozzle ring in a turbocharger is designed to direct the high-speed exhaust gases onto the turbine wheel, which in turn drives the compressor. Signup and view all the answers

What are the main differences between in-line and V-type engines?

In-line engines have all the cylinders arranged in a single row, while V-type engines have the cylinders arranged in two rows at an angle to each other. Signup and view all the answers

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

To prevent excessive pressure buildup inside the crankcase, which could lead to engine damage. Signup and view all the answers

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

Pressure sensors or temperature sensors. Signup and view all the answers

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

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

Clogged filters, fuel system corrosion, and reduced engine efficiency. Signup and view all the answers

Explain how water contamination may occur in the lubricating oil of a diesel engine.

Water can enter through condensation, leaks, or incomplete combustion processes. Signup and view all the answers

Outline the problems that water in engine oil may cause.

Reduced lubrication efficiency, corrosion, and engine wear. Signup and view all the answers

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

Lack of lubrication, bearing misalignment, or overloading. 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

Explain the effects of oil contamination of friction pads in pneumatically operated friction clutches.

Reduced friction, slippage, and decreased clutch performance. Signup and view all the answers

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