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单选题
Diesel engine cylinder head test cocks are used to（）
A
check cylinder lubrication prior to starting engine
B
connect exhaust gas analyzers to determine engine efficiency
C
pressure test cylinder heads to check for leaks
D
remove moisture accumulations from cylinder prior to starting
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单选题Low compression in a diesel engine can be caused by （）A
clogged coolant passagesB
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worn or broken cylinder liner sealing rings
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单选题A diesel engine cylinder head can crack as a result of （）A
a leaking seal ringB
heat transfer from exhaust valvesC
restricted cooling passagesD
overheated intake valves
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单选题One end of a diesel engine cylinder is sealed by the cylinder head and the other end by the （）A
crankcaseB
pistonC
cylinder linerD
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单选题If a crankcase explosion has occurred in a diesel engine, and the crankcase remains intact, which of following precautions should be observed?（）A
The cylinder indicator cocks should be openedB
The sump lube oil scavenge pump should be secured immediatelyC
The explosion relief valves should be manually openedD
The crankcase should remain unopened until the engine has cooled
考题
单选题Which of the following conditions could contribute to the cracking of a diesel engine cylinder head?（）A
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Insufficient heat transfer from the exhaust valvesC
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考题
单选题In the cylinder head of a two-stroke/cycle diesel engine, valves are used for（）A
air intakeB
a fuel outletC
cooling water inletsD
exhausting combustion gas
考题
单选题Which of the following statements represents the reason for rolling over a diesel engine with the cylinder indicator cocks open prior?（）A
To test the starting systemB
To remove air bubbles from the jacket waterC
To ensure that the lube oil system delivers pressureD
To ensure foreign material (water etc) is not present in the cylinders
考题
单选题The function of the piston compression rings used in a diesel engine is to （）A
seal the space between the piston and linerB
transmit heat from the piston to the cylinder linerC
reduce the amount of combustion gas blow-byD
all of the above
考题
单选题A change in the quality of fuel atomization by a diesel engine fuel injector would be caused by a/an （）A
increase in engine speedB
increase in cylinder turbulenceC
leaking needle valveD
reduction in cylinder turbulence
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单选题If water is found in the crankcase of a diesel engine, the cause may be due to（）A
a cracked cylinder headB
a leaky cylinder head gasketC
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考题
单选题Prior to starting, the purpose of turning over a main propulsion diesel engine with the cylinder test cocks open, is to （）A
test the starting systemB
remove condensation from the cylindersC
check the compressionD
check for proper lube oil pressure
考题
单选题In a large, low-speed diesel engine the clearance between the piston crown and cylinder head is found to be excessiveIn order to correct for this, you should（）A
build up the piston crown by metal sprayingB
build up the cylinder head by metal sprayingC
insert shims between the crankpin bearing box and the connecting rod footD
install a thinner head gasket
考题
单选题How does combustion air enter the cylinder of a two-cycle diesel engine?（）A
Cylinder head valvesB
PortsC
Turbo chargersD
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考题
单选题Engine coolant accumulating in the diesel engine lubricating oil can result from a （）A
low oil pressureB
high coolant pressureC
leaking fuel injectorD
cracked cylinder head or liner
考题
单选题What causes diesel fuel to be ignited in the cylinder of an operating diesel engine?（）A
Spark plugB
Heat of compressionC
CarburetorD
Glow plug
考题
单选题If you notice smoke coming fro the crankcase exhaust fan outlet of an operating diesel engine, you would suspect（）A
a cracked cylinder linerB
clogged intake portsC
broken piston ringsD
a faulty head gasket
考题
单选题Which of the following statements is correct for the design and installation of diesel engine cooling water systems?（）A
An alarm device with audible and visible signals is required for all cooling water systemsB
Propulsion engines with bores over 200 mm are to be fitted with cooling water jacketsC
Each totally enclosed cooling system shall be provided with a suitable head tankD
Drain cocks are to be provided at the lowest points of all cylinder water jackets
考题
单选题Piston compression rings used in a diesel engine function to （）A
transfer heat from the cylinder to the pistonB
scrape oil from the sides of the pistonC
seal the combustion space from the crankcasesD
prevent any piston contact with the cylinder liner
考题
单选题In an operating diesel engine, which of the following condition is an indication of a leaking air starting valve?（）A
noise coming from that air starting valveB
continuous operation of the starting air compressorC
zero air pressure in the air starting systemD
overheated starting air pipe to the cylinder head
考题
单选题A Kort nozzle is a(n)（）.A
hollow tube surrounding the propeller used to improve thrustB
nozzle attached to a firefighting hoseC
intake valve on a diesel engineD
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考题
单选题Fresh water is used for the cooling of cylinder jackets and （） of the marine diesel engine.A
cylinder coversB
lubricating spaceC
crossheadD
exhaust manifold
考题
单选题Diesel engine cylinder head test cocks are used to （）A
check cylinder lubricationB
connect the pressure indicator pressureC
test cylinder headsD
connect the exhaust gas pyrometers
考题
单选题Failure to open the diesel engine test cocks after a long period of shutdown, prior to starting may result in （）A
an air bound fuel systemB
damage to cylinder heads and pistonsC
excessive fuel injectionD
excessive air valve lift
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