更多"The (auto)ignition temperature is t"的相关试题:
[单项选择]Burner ignition failure in an automatically fired auxiliary boiler would be caused by（）
A. a burned out solenoid in the oil supply valve
B. high temperature excess air
C. incorrectly setting the hot-well dump valve
D. an incorrectly positioned burner snubber realy
[单项选择]Ignition failure in an automatically controlled auxiliary boiler could be caused by（）
A. carbon deposits on the flame scanner
B. high fuel oil temperature
C. low fuel oil viscosity
D. high steam pressure
[单项选择]The longer the ignition delay period resulting from improper use of low cetane fuel, the （）
A. less fuel will enter the cylinder
B. higher the cylinder combustion temperature
C. more complete the fuel combustion
D. more rapid the rise in combustion pressure
[单项选择]Spontaneous ignition can result from（）.
A. an unprotected drop-light bulb
B. careless disposal or storage of material
C. smoking in bed
D. worn electrical wires on power tools
[单项选择]Fuel has been injected but ignition fails The possible cause may be （）.
A. leaky exhaust valve
B. increased scavenging air temperature
C. engine cylinders not scavenged sufficiently
D. water in the fuel oil
[单项选择]The ignition quality of a diesel fuel is indicated by the （）
A. cetane number
B. volatility point
C. viscosity index
D. octane number
[单项选择]The ignition quality of diesel fuel is indicated by its（）
A. octane number
B. cetane number
C. viscosity in Saybolt seconds
D. air fuel ratio
[单项选择]What is LEAST likely to cause ignition of fuel vapors?（）.
A. Static electricity
B. An open running electric motor
C. Loose wiring
D. Explosion proof lights
[单项选择]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
[单项选择]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
[单项选择]The ignition quality of a diesel fuel oil is indicated by the （）
A. specific gravity
B. cetane number
C. viscosity
D. calorific valve
[单项选择]The ignition of the fuel in diesel engine is caused by the （） of compression of the air previously admitted into the cylinders.
A. vacuum pressure
B. specific gravity
C. heat
D. viscosity
[单项选择]Explosions do occur （） caused by the ignition of oil or vapour gaining access from compressors or defective engine starting valves.
A. in boiler drums
B. in refrigerating plants
C. in starting air pipes
D. in air coolers
[单项选择]The higher the cetane number, （） the ignition quality of the fuel.
A. the worse
B. the better
C. the smaller
D. the greater
[单项选择]In an operating diesel engine, pre-ignition can be caused by （）
A. excessively late fuel injection
B. oil in the air charge
C. water in the fuel
D. injection continuing after the fuel charge is ignited
[单项选择]The temperature differential occurring between the inlet temperature of the fluid to be cooled and the outlet temperature of the cooling medium in a shell-and-tube heat exchanger is greatest in which of the flow designs listed?（）
A. Cross
B. Parallel
C. Counter
D. Circular
[单项选择]Temperature and moisture characteristics are modified in a warm or cold air mass due to （）.
A. pressure changes in the air mass
B. movement of the air mass
C. the heterogeneous nature of the air mass
D. upper level atmospheric changes
[单项选择]（）is the temperature today?
A. What
B. How
C. How many
D. How much
[单项选择]Temperature control valves installed in the jacket cooling water system of a diesel engine modulates the rate of water flow through the （）.
A. cooling water pump
B. nozzle cooling passages
C. cylinder jackets
D. heat exchanger
