Small Vessel Second Engineer - Marine Diesel Engineering Exam
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Questions and Answers

What are the effects of too large a tappet clearance in four-stroke diesel engine exhaust valves?

Decreased compression and loss of power

What are the effects of too small a tappet clearance in four-stroke diesel engine exhaust valves?

Valve not fully closing, leading to burnt valves

Why may double (nested) valve springs be fitted in a four-stroke diesel engine?

To prevent valve float and ensure proper valve operation

What is the purpose of zinc anodes in air coolers?

<p>To protect against galvanic corrosion</p> Signup and view all the answers

What is the purpose of vent cocks in air coolers?

<p>To release trapped air and gases</p> Signup and view all the answers

What is the purpose of tube fins in air coolers?

<p>To increase the surface area for better heat transfer</p> Signup and view all the answers

Describe a procedure for manually testing the set points on diesel generator HT cooling water, high temperature alarm, and shut down.

<p>Manually adjust the set points and observe the responses to ensure proper functioning</p> Signup and view all the answers

How can the delivered quantity of fuel oil be controlled in Bosch or jerk type fuel injection pumps?

<p>By adjusting the rack position or the cam profile</p> Signup and view all the answers

What is the purpose of the delivery valve in fuel injection pumps?

<p>Prevents fuel from flowing back into the pump</p> Signup and view all the answers

Describe TWO methods of cylinder liner lubrication in medium speed diesel engines.

<p>Splash lubrication and forced lubrication</p> Signup and view all the answers

What are the possible effects of insufficient lubrication in an engine?

<p>Increased friction, overheating, and wear on engine components</p> Signup and view all the answers

What are the possible effects of excessive lubrication in an engine?

<p>Oil leaks, increased oil consumption, and potential damage to the engine seals</p> Signup and view all the answers

Describe the construction of a plate type heat exchanger with the aid of a sketch.

<p>Plate heat exchangers consist of multiple thin plates with gaskets in between, stacked together to create flow channels for heat exchange</p> Signup and view all the answers

State THREE advantages of plate type heat exchangers compared with tube type heat exchangers.

<p>Higher heat transfer efficiency, compact size, and ease of maintenance</p> Signup and view all the answers

List FOUR safety interlocks that may be fitted to a direct air start medium speed diesel engine to prevent inadvertent starting during maintenance.

<p>Locking pins, key switches, warning signs, and mechanical barriers</p> Signup and view all the answers

Explain the opening period of an air start valve on a four-stroke diesel engine in relation to the crank angle, inlet, and exhaust valves.

<p>The air start valve opens during the compression stroke after the exhaust valve closes and before the inlet valve opens</p> Signup and view all the answers

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