Marine Diesel Engineering Certification Exam

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What is the purpose of fitting double (nested) valve springs in a four-stroke diesel engine?

To provide greater valve control and prevent valve float (correct)

To increase engine efficiency

To reduce engine emissions

To improve fuel combustion

Why may too small a tappet clearance in a four-stroke diesel engine have negative effects?

It increases engine durability

It improves engine power output

It leads to lower fuel consumption

It may cause valve sticking and incomplete closing (correct)

What is the role of zinc anodes in air coolers on marine vessels?

To regulate air flow

To prevent galvanic corrosion (correct)

To enhance heat transfer efficiency

To maintain optimal coolant temperature

Why are vent cocks installed in air coolers on marine vessels?

To drain any accumulated water or condensate Signup and view all the answers

Which procedure involves testing the set points on diesel generator HT cooling water, high-temperature alarm, and shutdown manually?

Safety system function verification Signup and view all the answers

In a Bosch or jerk type fuel injection pump, how is the delivered quantity of fuel oil controlled?

By varying the stroke length of the plunger through mechanical means Signup and view all the answers

What is the primary purpose of the delivery valve in a fuel injection pump?

To prevent backflow of fuel from the high-pressure line Signup and view all the answers

Which of the following is NOT a method of cylinder liner lubrication in medium speed diesel engines?

Gravity feed lubrication from an overhead tank Signup and view all the answers

What is a potential effect of insufficient lubrication in a diesel engine?

Excessive wear of moving parts Signup and view all the answers

Which of the following statements about plate type heat exchangers is correct?

The plates have a corrugated surface to enhance heat transfer Signup and view all the answers

Which of the following is NOT an advantage of plate type heat exchangers compared to tube type heat exchangers?

Lower initial cost Signup and view all the answers

Which of the following safety interlocks is NOT commonly fitted to a direct air start medium speed diesel engine?

Low fuel level trip Signup and view all the answers

In relation to the crank angle and valve timing, when does the air start valve open on a four-stroke diesel engine?

Shortly after top dead center on the compression stroke Signup and view all the answers

When inspecting a cylinder liner and piston assembly after removal from the engine, which of the following faults is NOT likely to be found?

Cracks in the piston skirt Signup and view all the answers

Marine Diesel Engineering Certification Exam

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