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单选题
The ignition quality of a fuel oil is an important operational consideration because it（）
A
indicates the amount of abrasive material in the fuel
B
affects the starting ability of a cold engine
C
determines the amount of fuel penetration engine
D
affects the compression ratio of an operating engine
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考题
Crankcase explosions in propulsion diesel engines result from ____.A.the splashing of lubrication oil by the crankshaftB.the dilution of crankcase oil with particles of combustionC.broken fuel lines spraying oil on the crankcaseD.the ignition of unburned fuel and air in the crankcase
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The cetane number of a diesel fuel oil indicates its ______.A.ignition qualityB.acid contentC.heating valueD.viscosity
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The cetane number of a diesel fuel oil indicates its ______.A.viscosityB.acid contentC.heating valueD.ignition quality
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Fuel has been injected but ignition fails. The possible cause may be ______.A.slightly leaky exhaust valveB.increased scavenging air temperatureC.engine cylinders not scavenged sufficientlyD.too much water in the fuel oil
考题
How does foam extinguish an oil fire ?______.A.By cooling the oil below the ignition temperatureB.By removing the fuel souce from the fireC.By excluding the oxygen from the fireD.By increasing the weight of the oil
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单选题If the overflow tank high-level alarm sounds while the fuel oil tanks are being topped off, the engineer should （）.A
close the static leg filling valveB
close the overflow tank falling valveC
reduce the fuel oil pumping rateD
stop the fuel oil pumping operation
考题
单选题In diesel engineering practice, the term used to express the ignition quality of a particular fuel is（）A
cetane numberB
octane numberC
ignition index numberD
volatility point
考题
单选题Fuel oil having a low cetane rating could result in（）A
improved cold weather startingB
excessive fuel oil consumptionC
reduced ignition lagD
smoother engine operation
考题
单选题A diesel engine is turned at normal cranking speed and no ignition occursThis could be the result of （）A
low lube oil temperatureB
low starting air temperatureC
air bubbles in the fuel oil systemD
water in the starting air system
考题
单选题The higher the cetane number, （） the ignition quality of the fuel.A
the worseB
the betterC
the smallerD
the greater
考题
单选题The cetane number of a diesel fuel oil indicates its（）A
ViscosityB
acid contentC
heating valueD
ignition quality
考题
单选题The temperature of the fuel oil received during bunkering operation is critical in determining the （）A
expansion space to leave in a tankB
flash point at which the fuel will burnC
temperature to which the fuel must be heatedD
rate at which the fuel can be pumped during transfer operations
考题
单选题Crankcase explosions in propulsion diesel result from（）A
the splashing of lubrication oil by the crankshaftB
the dilution of crankcase oil with particles of combustionC
broken fuel lines spraying oil on the crankcaseD
the ignition of unburned fuel and air in the crankcase
考题
单选题Proper filtering and straining of diesel fuel is important because the（）A
fuel oil pump will over-speed if dirt is not removedB
fuel oil transfer pumps cannot tolerate small amounts of grit in the oilC
fuel injectors may be damaged by foreign particles in the fuel oil dirtyD
fuel will clog the intake air filter
考题
单选题The quality of the fuel oil and lube oil （）, Im afraid.A
has much to do with the operation of the engine and its lifeB
have much to do with the operation of the engine and its lifeC
has much doing with the operation of the engine and its lifeD
have much doing with the operation of the engine and its life
考题
单选题The ignition quality of diesel fuel is indicated by its（）A
octane numberB
cetane numberC
viscosity in Saybolt secondsD
air fuel ratio
考题
单选题The ignition quality of a diesel fuel is indicated by the （）A
cetane numberB
volatility pointC
viscosity indexD
octane number
考题
单选题Ignition failure in an automatically controlled auxiliary boiler could be caused by（）A
carbon deposits on the flame scannerB
high fuel oil temperatureC
low fuel oil viscosityD
high steam pressure
考题
单选题One result of operating a diesel engine at light load with excessively low cooling water temperature is a/an （）A
decrease in ignition lagB
increase in fuel economyC
reduction in lube oil viscosityD
increase in cylinder misfiring
考题
单选题Faulty operation of diesel engine fuel injection nozzles can be directly caused by （）.A
water in the fuel oil supplyB
excessive fuel nozzle holder coolingC
a distorted fuel spray patternD
leakage past the plunger into the oil drain
考题
单选题The ignition quality of a diesel fuel oil is indicated by the （）A
specific gravityB
cetane numberC
viscosityD
calorific valve
考题
单选题Heat for igniting the fuel oil in the cylinder of a diesel engine is generated by the （）A
electronic ignition systemB
compression of air by the pistonC
friction in the fuel injectorD
fuel oil bearing system
考题
单选题Surface irregularities, such as erosion and pitting on injection pump plungers, will（）A
increase ignition delayB
affect fuel oil meteringC
affect engine performance at low speedD
only disappear due to fuel oil abrasion
考题
单选题Fuel has been injected but ignition fails The possible cause may be （）.A
leaky exhaust valveB
increased scavenging air temperatureC
engine cylinders not scavenged sufficientlyD
water in the fuel oil
考题
单选题When comparing different fuels for different engines, the ignition quality of diesel fuel oils becomes a less critical consideration as （）A
the amount of lube oil additives increaseB
piston speeds increaseC
injection pressure decreaseD
engine speeds decrease
考题
单选题Proper filtering and straining of fuel oil is important because the （）.A
fuel oil pump will over-speed if dirt is not removedB
fuel oil transfer pumps cannot tolerate small amounts of dirt in the oilC
fuel injectors may be damaged by foreign particles in the fuel oilD
dirty fuel will clog the intake air filter
考题
单选题The minimum fuel oil delivery pressure required for diesel engine injection depends primarily on the（）A
degree of cylinder air turbulenceB
firing pressure in the engineC
quality of fuel to be injectedD
duration of the ignition delay period
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