indicates the amount of abrasive material in the fuel
affects the starting ability of a cold engine
determines the amount of fuel penetration engine
affects the compression ratio of an operating engine
第1题：
The cetane number of a diesel fuel oil indicates its ______.
A.viscosity
B.acid content
C.heating value
D.ignition quality
第2题：
How does foam extinguish an oil fire ?______.
A.By cooling the oil below the ignition temperature
B.By removing the fuel souce from the fire
C.By excluding the oxygen from the fire
D.By increasing the weight of the oil
第3题：
Crankcase explosions in propulsion diesel engines result from ____.
A.the splashing of lubrication oil by the crankshaft
B.the dilution of crankcase oil with particles of combustion
C.broken fuel lines spraying oil on the crankcase
D.the ignition of unburned fuel and air in the crankcase
第4题：
low lube oil temperature
low starting air temperature
air bubbles in the fuel oil system
water in the starting air system
第5题：
cetane number
octane number
ignition index number
volatility point
第6题：
Fuel has been injected but ignition fails. The possible cause may be ______.
A.slightly leaky exhaust valve
B.increased scavenging air temperature
C.engine cylinders not scavenged sufficiently
D.too much water in the fuel oil
第7题：
close the static leg filling valve
close the overflow tank falling valve
reduce the fuel oil pumping rate
stop the fuel oil pumping operation
第8题：
The cetane number of a diesel fuel oil indicates its ______.
A.ignition quality
B.acid content
C.heating value
D.viscosity
第9题：
improved cold weather starting
excessive fuel oil consumption
reduced ignition lag
smoother engine operation
第10题：
the worse
the better
the smaller
the greater