网友您好, 请在下方输入框内输入要搜索的题目:
题目内容
(请给出正确答案)
单选题
A faulty thermostatic bypass valve, in a diesel engine cooling system, can result in ()
A
excessive time required for warming-up
B
excessive freshwater corrosion
C
scale formation on the saltwater side
D
saltwater mixing with the freshwater
参考答案
参考解析
解析:
暂无解析
更多 “单选题A faulty thermostatic bypass valve, in a diesel engine cooling system, can result in ()A excessive time required for warming-upB excessive freshwater corrosionC scale formation on the saltwater sideD saltwater mixing with the freshwater” 相关考题
考题
In a diesel engine closed freshwater cooling system, the amount of coolant flowing through the heat exchanger is controlled by the __.A.suction pressure regulatorB.thermostatic bypass valveC.sea water temperatureD.water level in the expansion tank
考题
If the jacket water temperature rises rapidly above normal in a diesel engine, you should firstA.place standby cooler in operationB.reduce engine loadC.check thermostatic valveD.clean sea water strainer
考题
The main propulsion diesel engine jacket water temperature rises above normal, with the raw sea suction and the expansion tank water level being normal. Which of the following problems is most likely the cause?A.Faulty thermostatic bypass valveB.Eroded zinc pencils in the heat exchangerC.Steam formation in the expansion tankD.Excessive leakage from jacket water pump seals
考题
A bypass line provided around a waste heat auxiliary boiler in a diesel engine exhaust system, may be used to avoid boiler ______.A.corrosion at low engine loadsB.erosion at high engine loadsC.overload at high engine loadsD.scaling at all exhaust temperatures
考题
单选题A three-way thermostatic control valve regulates the diesel engine cooling water temperature by passing a portion of the water ().A
around the engineB
around the coolerC
to the expansion tankD
overboard
考题
单选题The shape of a cam on a diesel engine determines the valve’s ()A
point of openingB
speed of openingC
lift from its seatD
all of the above
考题
单选题White smoke issuing from the exhaust of an auxiliary diesel engine valve opening ()A
the engine is overloadedB
the engine is coldC
there is too much lube oil in the cylindersD
the turbocharger is fouled
考题
单选题The diesel engine exhaust gas bypass, as fitted with some waste heat boilers, is installed to ()A
prevent engine back pressure at heavy loadsB
increase total engine efficiency at low loadsC
prevent boiler corrosion at low engine loadsD
improve engine fuel consumption at any load
考题
单选题If the operating element of a thermostatic valve installed in a diesel engine cooling system malfunctions, it may result in ()A
a low level in the engine expansion tankB
excessively high coolant pressureC
improper temperaturesD
malfunctioning of the jacket water heater
考题
单选题Before starting a diesel engine that has an engine driven lube oil pump, the engineer should ().A
open the bypass lineB
cut in the lube oil coolerC
pressurize the lube oil systemD
top off the expansion tank
考题
单选题If a single cylinder relief valve on a diesel engine lists frequently while the engine is running, the cause may be an ()A
excessively late injection timing for each cylinderB
incorrectly adjusted intake valve timingC
incorrectly adjusted fuel injectorD
incorrectly adjusted intake valve clearance
考题
单选题The main propulsion diesel engine jacket water temperature rises above normal, with the raw water sea suction and the expansion tank water level being normalWhich of the following problems is most likely the cause?()A
Faulty thermostatic bypass valveB
Eroded zinc pencils in the heat exchangerC
Steam formation in the expansion tankD
Excessive leakage from jacket water pump seal
考题
单选题The size of the exhaust valve opening is ()A
most critical in a four-stroke cycle diesel engineB
most critical in a two-stroke/cycle diesel engineC
most critical in a four-stroke/cycle diesel engine if it is turbochargedD
of equal importance in a two-stroke/cycle diesel engine as in a four-stroke/cycle diesel engine
考题
单选题Worn diesel engine intake valve guides can result in ()A
increased engine breathing efficiencyB
excessive valve lashC
excessive lube oil consumptionD
lower than normal fuel consumption
考题
单选题Diesel engine air start valve timing is controlled by()A
engine operating speedB
an air manifoldC
a hydraulic distributorD
individual cams and valve gear
考题
单选题Icreasing the exhaust valve tappet clearance of a diesel engine will result in the exhaust valve opening ()A
later and closing earlierB
later and closing laterC
earlier and closing earlierD
earlier and closing later
考题
单选题Broken intake valve springs on one cylinder of a diesel engine can cause the engine to ()A
Over speedB
fire improperlyC
lose oil pressureD
overheatrapidly
考题
单选题A faulty injection in one cylinder of an operating diesel engine can be located by ()A
cutting out individual injectors and noting engine performanceB
checking lube oil temperatureC
checking cam positionD
using a timing light
考题
单选题If the jacket water temperature rises rapidly above normal in a diesel engine, you should FIRST ()A
place standby cooler in operationB
reduce engine loadC
check thermostatic valveD
clean sea water strainer
考题
单选题A loud clicking noise from the valve compartment of an operating diesel engine would indicate()A
worn valve seatsB
worn main bearingC
excessive valve clearanceD
weak rocker arm springs
考题
单选题Which of the following precautions must be taken if an electric immersion heater is used to keep the coolant in a diesel engine warm during the time the engine is secured?()A
The coolant temperature must be maintained at 180℃B
The thermostatic bypass valves must be manually opened before the engine is startedC
The pressure cap must be removed while the engine is securedD
Electrical power to the heater must be secured before the cooling system is drained
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
piston cylinder on a diesel engine
考题
单选题A faulty thermostatic bypass valve, in a diesel engine cooling system, can result in ()A
excessive time required for warming-upB
excessive freshwater corrosionC
scale formation on the saltwater sideD
saltwater mixing with the freshwater
考题
单选题Scavenging in a turbocharged, four-stroke/cycle diesel engine is accomplished()A
during the valve overlap periodB
with only the exhaust valve openC
at a pressure below atmosphericD
without cooling the cylinders or pistons
考题
单选题Compared to a naturally aspirated diesel engine, a supercharged diesel engine has()A
a cylinder air charge of higher pressureB
increased pumping lossesC
less valve overlapD
reduced blow-by
考题
单选题In a diesel engine, an extremely leaking exhaust valve can cause ().A
misfiringB
pre-ignitionC
interrupted scavengingD
reduced scavenging
考题
单选题The timing of diesel engine air starting valves is controlled by()A
the air start valve timing gears and rodsB
a cylinder check valveC
individual cams and valve gearD
an air manifold poppet valve
考题
单选题The jacket water temperature in a diesel engine closed freshwater cooling system is normally controlled by ()A
regulating the level of corrosion inhibitor in the primary cooling systemB
the level of the freshwater expansion tankC
varying the engine load to meet temperature requirementsD
the operation of the thermostatic valve
热门标签
最新试卷