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
The longer the ignition delay period occurs in a diesel engine, the （）.
A
less fuel will enter the cylinder
B
lower will be cylinder compression temperatures
C
more complete will be fuel combustion
D
more rapid will be the rise in combustion pressure
参考答案
参考解析
解析：
暂无解析
更多 “单选题The longer the ignition delay period occurs in a diesel engine, the （）.A less fuel will enter the cylinderB lower will be cylinder compression temperaturesC more complete will be fuel combustionD more rapid will be the rise in combustion pressure” 相关考题
考题
Fuel droplets injected into a diesel engine cylinder must have adequate penetration to ____.A.prolong the ignition delay periodB.ensure the beginning of fuel injectionC.thoroughly utilize the air chargeD.allow controlled fuel combustion
考题
International traders often () a longer period for ()of an account.A、requested,settlementB、requested,settlingC、request,settlementD、request,settling
考题
The cetane number of a diesel fuel oil indicates its ______.A.ignition qualityB.acid contentC.heating valueD.viscosity
考题
How are STP timers and state transitions affected when a topology change occurs in an STP environment？（）A、All ports will temporarily transition to the learning state for a period equal to the max age timer plus the forward delay interval.B、All ports will transition temporarily to the learning state for a period equal to the forward delay interval.C、The default aging time for MAC address entries will be reduced for a period of the max age timer plus the forward delay interval.D、The default hello time for configuration BDPUs will be reduced for the period of the max age timer.
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The ignition of the fuel in diesel engine is caused by the （） of compression of the air previously admitted into the cylinders.A
vacuum pressureB
specific gravityC
heatD
viscosity
考题
单选题A diesel engine will lose power if fuel injection occurs too early because the （）A
fuel will not be properly atomized in the cylinderB
ignition will be delayed due to low ignition temperatureC
maximum fuel expansion will occur on the compression strokeD
fuel will ignite before top dead center
考题
单选题In an operating diesel engine, pre-ignition can be caused by （）A
excessively late fuel injectionB
oil in the air chargeC
water in the fuelD
injection continuing after the fuel charge is ignited
考题
单选题The process that occurs when heat is generated by a chemical reaction within a substance and continues to a point of ignition is known as （）.A
chemical ignitionB
spontaneous combustionC
chemical combustionD
radiation ignition
考题
单选题How are STP timers and state transitions affected when a topology change occurs in an STP environment？（）A
All ports will temporarily transition to the learning state for a period equal to the max age timer plus the forward delay interval.B
All ports will transition temporarily to the learning state for a period equal to the forward delay interval.C
The default aging time for MAC address entries will be reduced for a period of the max age timer plus the forward delay interval.D
The default hello time for configuration BDPUs will be reduced for the period of the max age timer.
考题
单选题What occurs in the combustion space of a diesel engine cylinder shortly after ignition and before the piston reaches TDC?（）A
Rapid increase in temperature with constant pressureB
Rapid increase in pressure with constant temperatureC
Rapid increase in pressure and temperatureD
Rapid increase in volume and decrease in pressure
考题
单选题What is the purpose of the intake/exhaust valves in a diesel engine? （）A
They regulate the combustion cycleB
They supply cooling waterC
They synchronize the ignition sparkD
They supply and regulate the lubricant flow
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 longer the ignition delay period resulting from improper use of low cetane fuel, the （）A
less fuel will enter the cylinderB
higher the cylinder combustion temperatureC
more complete the fuel combustionD
more rapid the rise in combustion pressure
考题
单选题The longer the ignition delay period occurs in a diesel engine, the （）.A
less fuel will enter the cylinderB
lower will be cylinder compression temperaturesC
more complete will be fuel combustionD
more rapid will be the rise in combustion pressure
考题
单选题Combustion knock occurring in a diesel engine can be caused by （）.A
excessive fuel penetrationB
prolonged injection lagC
reduced ignition lagD
prolonged ignition lag
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A diesel engine will lose power if fuel injection occurs too late in the cycle, because the（）A
fuel droplets will burn as they leave the fuel injectorB
fuel will not be properly atomized in the cylinderC
maximum expansion of the burned fuel cannot take place in the cylinderD
compression pressure will be too low to cause fuel ignition
考题
单选题The abbreviation TDC means （）.A
top dead centerB
temperature difference centerC
time delay dockD
top diesel company
考题
单选题The purpose of compressing the air within the cylinder of a diesel engine is to （）A
produce the heat for ignitionB
decrease injection lagC
increase ignition delayD
aid in exhausting burnt gases
考题
单选题Fuel droplets injected into a diesel engine cylinder must have adequate penetration to （）A
prolong the ignition delay periodB
ensure the beginning of fuel injectionC
thoroughly utilize the air chargeD
allow controlled fuel combustion
考题
单选题In general，the most effective period for observing stars and planets occurs during the darker limit of（）.A
sunsetB
civil twilightC
nautical twilightD
astronomical twilight
考题
单选题The highest pressure in a diesel engine cylinder normally occurs （）.A
at TDCB
before TDCC
after TDCD
during air starting
考题
单选题Increasing the valve clearance between a valve stem and rocker arm, will result in the valve （）A
closing laterB
opening soonerC
staying open for a shorter period of timeD
staying open for a longer period of time
考题
单选题The rate of pressure rise during the period following fuel ignition in a diesel will result in （）A
valve overlapB
volumetric efficiencyC
turbulence of the air changeD
fuel efficiency
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
考题
单选题A mixture of 45%cetane and 55% alpha-methyl-naphthalene is found to have the same ignition delay as a sample of diesel oil √The sample can be described as having a/an（）A
cetane number of 55B
cetane number of 45C
octane number of 55D
octane number of 45
热门标签
最新试卷