Motor 1

Friction developing between the moving parts of a governor, governor linkage and control valve will cause the governor to __________.

• react with insufficient speed droop

• fail to react to small speed changes

• have excessive sensitivity to small speed changes

• remain in the neutral position

Diesel engine jacket water is used in the fresh water distillation process as the __________.

• coolant for the distillate

• coolant for the brine cooler

• means of heating the feedwater

• primary means of producing a vacuum within the distiller

Microbiological growths in marine fuel are a common occurrence that can be __________.

• extremely detrimental to equipment and operating processes

• prevented by maintaining higher storage temperatures

• removed from emulsified fuel oil during the centrifuging processes

• All of the above are correct.

When a waste heat boiler is installed in the exhaust of a main propulsion diesel engine, the exhaust gas bypass would be used __________.

• at high loads to prevent overheating

• at low loads to prevent corrosion in the boiler

• during periods of high steam demand

• when the turbocharger is in operation

Which of the following statements describes the function of an expansion tank in a diesel engine cooling system?

• Maintains a constant head on the system.

• Reduces the likelihood of air or steam pockets formation.

• Provides a low pressure point for the addition of makeup cooling water and chemicals.

• All of the above.

Throttling a burner air register on an auxiliary boiler could result in __________.

• smoky boiler operation

• decreased fuel consumption

• improved fuel combustion

• fewer soot deposits

Lubrication for the main reduction gears used with diesel engines is usually supplied by __________.

• oil from the main engine sump

• an independent lube oil system

• the stern bearing head tank

• the stern bearing sump tank

The most common cause of scale formation in an auxiliary boiler is __________.

• concentrations of calcium sulfate in the boiler water

• fuel oil in the feedwater

• improper treatment of the feedwater with calcium sulfate

• excessive feedwater alkalinity

The concentration of dissolved solids in the boiler water of an auxiliary boiler could increase as a result of __________.

• phosphate treatment

• zero water hardness

• dissolved oxygen deaeration

• frequent bottom blows

With regards to a diesel engine crankcase explosion, the most violent is the __________.

 I.  primary explosion
 II. secondary explosion

• I only

• II only

• both I and II

• neither I or II