單項(xiàng)選擇題What is the purpose of sub cooling R-12 in the condenser?()

A.to increase the system efficiency by sensible heat transfer
B.to stop the liquid from flashing
C.to reduce the load on the compressor
D.to remove latent heat of vaporization and the suction piping transfer


您可能感興趣的試卷

你可能感興趣的試題

1.單項(xiàng)選擇題In terms of pressure and temperature in the refrigerant in the compressor, what happens to the primary?()

A.its pressure and temperature are both lowered
B.its pressure and temperature are both raised
C.its pressure is lowered and its temperature is raised
D.its pressure is raised and its temperature is lowered

2.單項(xiàng)選擇題The solenoid valve can be typed as a()

A.thermal valve
B.magnetic stop valve
C.bellows valve
D.bimetallic valve

3.單項(xiàng)選擇題If the compressor runs continually, the cause might be the()

A.high-pressure cutout switch is jammed open
B.low-pressure switch is jammed shut
C.thermal bulb is not operating properly
D.scale trap is clogged

4.單項(xiàng)選擇題The bulb for the thermal expansion valve is located()

A.in the middle of evaporator coils
B.near the evaporator coil outlet
C.near the evaporator coil inlet
D.on the bottom row of evaporator coils

5.單項(xiàng)選擇題The thermal expansion valve responds to the()

A.amount of superheat in the vapor leaving the coil
B.amount of superheat in the liquid
C.temperature in the evaporator coils
D.pressure in the evaporator coils

最新試題

Flame failure in an automatically fired auxiliary boiler can from a/an ()

題型:單項(xiàng)選擇題

Which of the listed governor characteristics will greatly affect the load sharing relationship between paralleled diesel generators?()

題型:單項(xiàng)選擇題

When does auxiliary burner of incinerator put into operation? ()Ⅰ. start incinerator when it is coldⅡ. the sludge for dealing with is littleⅢ. the sludge for dealing with is largeⅣ. the water and impurity in sludge are too muchⅤ. the temperature in incinerator is lowⅥ. dealing with little solid rubbish

題型:單項(xiàng)選擇題

Diesel engine air start system check valves are opened by ()

題型:單項(xiàng)選擇題

One of the reasons that cause oil flowed from sludge outlet of a self-cleaning separator is()

題型:單項(xiàng)選擇題

() is not installed on the main switchboar.

題型:單項(xiàng)選擇題

Refrigerant entering the compressor of a refrigeration system should be in which of the following conditions?()

題型:單項(xiàng)選擇題

Engine parameters shall be corresponded to NOx Technical Files. This is required by ()

題型:單項(xiàng)選擇題

Which of the diesel engine components listed increase air density and helps to improve engine operating efficiency?()

題型:單項(xiàng)選擇題

During the diesel engine running, the water level of F.W expansion tank should normally kept in the () level of glass tube.

題型:單項(xiàng)選擇題