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The purpose of the skirt or trunk in four-stroke cycle engines is to act in a similar manner to a （）.
A . crosshead
B . crown
C . piston rod
D . connecting rod
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If the detergent type lubricating oil being used in a diesel engine is black, the oil （）
A . must be centrifuged
B . must by filtered
C . must be changed
D . is holding finely dispersed carbon in suspensio
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What is the typical number of trunks in a Call Center?（）
A . equal to half the number of IVR ports
B . greater than the number of IVR ports plus the number of agent phones
C . less than or equal to the number of IVR ports plus the number of agent phones
D . twice the number of IVR ports plus the number of agent phones&e
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Trunk-type diesel engine pistons are most effectively cooled by heat（）
A . conducted through the engine block
B . conducted to water cooled cylinder walls
C . conducted through the piston crown
D . loss to escaping exhaust gase
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A turbocharged, four-stroke/cycle diesel engine has a larger valve overlap than a naturally aspirated four-stroke/cycle diesel engine, in order to in crease the （）.
A . temperature of the exhaust gases
B . energy supplied to the turbocharger
C . air pressure to the intake manifold
D . purge of exhausted gases from the cylinder
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In a medium speed diesel engine, a trunk type piston may be cooled by（） Ⅰ.oil circulation though passages in the piston crown Ⅱ.heat transfer through piston rings and liner wall
A . Ⅰ only
B . Ⅱ only
C . either Ⅰ or Ⅱ
D . neither Ⅰ or Ⅱ
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Cooling water pumps driven by direct reversing diesel engines are usually of the straight impeller vane type pump with a concentric housing to（）
A . facilitate bi-directional operation
B . provide the greatest pump efficiency
C . prevent pump clogging from marine growth
D . prevent cavitation at the pump outlet
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Trunk type diesel engine pistons are effectively cooled when heat is（）
A . radiated through the engine block
B . transferred to water cooled cylinder walls
C . conducted through the piston crown
D . transferred to escaping exhaust gase
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A supercharged diesel engine when compared to a similar naturally aspirated diesel engine, will develop an increase in （）
A . ignition lag
B . engine horsepower
C . lube oil system pressure
D . specific fuel consumptio
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Worn main bearings in a diesel engine can result in （）
A . decreased compression pressure
B . increased lube oil pressure
C . lower lube oil temperature
D . excessive leakage past the piston ring
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Gear-type flexible couplings are often used in diesel engine drive trains because they（）
A . require no lubrication under normal operating conditions
B . compensate for gross misalignment in the drive train
C . are able to transmit high torque ,even where slight misalignment exists
D . will rapidly disconnect the engine from the line shaft
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A diesel engine is supercharged in order to（）
A . lower the no-load RPMs
B . provide more air for combine with the fuel
C . increase the no-load RPMs
D . provide more fuel combine with the air
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A drop in compression pressure in one cylinder of a diesel engine can be caused by（）
A . a leaking fuel injection nozzle
B . a clogged air filter
C . early fuel injection
D . burned valve
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A dry-type spark arrestor removes sparks from a diesel engine exhaust by（）
A . increasing the linear velocity of the exhaust gases
B . changing directions of exhaust gas flow
C . decreasing the temperature of the exhaust gases
D . accelerating the exhaust gas through a reduced size orifice
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Which encapsulation types are configurable on a Cisco switch for a trunk?（）
A . VTP
B . ISL
C . CDP
D . 802.1Q
E . 802.1p
F . LLC
G . IETF
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During the power stroke of a four-stroke/cycle diesel engine, most of the side thrust of a trunk-type piston is absorbed by the（）
A . piston skirt
B . pinion
C . crosshead
D . compression ring
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A defective injector nozzle in a propulsion diesel engine can cause（）
A . engine power losses
B . smoking due to unburned fuel
C . high exhaust temperature readings
D . all of the above
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The diesel engine is a type of （）.
A、A. turbine engine
B、B. gas turbine
C、C. steam engine
D、D. internal combustion engine
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To shut down a diesel engine after it exceeds the set maximum speed，which type of device listed should be used?（）
A . Speed limiting governor
B . Over-speed governor
C . Over-speed trip
D . Over-speed relay
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On a ship，the possibility of a blowout makes which type of diesel engine shutdown desirable?（）
A . Overspeed trip
B . Air inlet shut-off valve
C . Water injector
D . Fuel cutoff valve
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The diesel engine is a type of internal combustion engine which ignites the fuel by injecting it into hot, high pressure air in a （）.
A . air bottle
B . air compressor
C . crank case
D . combustion chamber
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In a diesel engine, blow-by（）
A . increase exhaust back pressure
B . causes excessive crankcase pressure
C . can only be detected by a compression check
D . decreases fuel consumptio
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During the power stroke of a four-stroke/cycle diesel engine, most of the side thrust of a trunk-type piston is absorbed by the_____________.
A.piston skirt
B.pinion
C.crosshead
D.compression rings
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The marine diesel engine is a type of diesel engine used on shipsThe _____ of its operation is not very difficult to understand.
A.principle
B.principal
C.cause
D.case
