单项选择题

Which of the following statements is correct concerning the “flash point ” of a liquid?（）

A.It is lower than the ignition temperature
B.It is the temperature at which a substance will spontaneously ignite
C.It is the temperature at which a substance, when ignited, will continue to bum
D.It is the temperature at which the released vapors will fall within the explosive range

点击查看答案&解析

上一题目录下一题

相关考题

单项选择题

Sludge may form in the crankcase of an air conditioning compressor as a result of （）.

A.bubbling refrigerant
B.overheating and oxidation
C.lowered operating temperatures
D.reducing the cloud or flash point

单项选择题

Which of the following centrifugal pump components converts the liquid kinetic energy of velocity to the potential energy of pressure?（）

A.Impeller
B.Electric motor
C.Volute
D.Eye

单项选择题

Excessive circulation of the lubricating oil with the refrigerant in a refrigeration system will cause （）.

A.carbon deposits on the compressor suction valves
B.the evaporator temperature to increase
C.rapid corrosion of the thermal expansion valve
D.no operating problems