A.total head
B.discharge head
C.net positive suction head
D.suction head
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A.slide block
B.tilting box
C.pintle
D.reaction ring
A.Liquids with different viscosities will always have the same specific gravity
B.Liquids with different viscosities will never have the same specific gravity
C.Viscosity and specific gravity are directly proportional
D.Viscosity and specific gravity are not related in that one does not define or limit the other
A.stored at temperatures below 60 degrees Fahrenheit
B.charged into a system having copper fittings
C.allowed to mix with compressor oil
D.exposed to an open flame or hot surface
A.acid formation
B.sludge formation
C.ice in the expansion valve
D.All of the above
A.superheated outside the system
B.in contact with an open flame
C.heated to the boiling point
D.All of the above
最新試題
An excessive charge of refrigerant in an air-cooled refrigeration system can cause （）.
Which of the following statements is correct concerning heat transfer?（）
Heavy wear in a particular area of the inner circumference of a packing ring may be caused by （）.
The general purpose of a heat exchanger is to （）.
If the suction pressure at the refrigeration compressor is below normal, the cause can be（）.
A pressure drop through the refrigerant liquid line may cause （）.
A salinity indicator is used to determine the （）.
The rate of heat transfer between the hot and cold fluids passing through a shell-and-tube type heat exchanger will （）.
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?（）
Who is responsible for ensuring that someone is assigned to close the watertight doors in an emergency?（）