單項(xiàng)選擇題Excessively low air pressure occurring in the intercooler of a reciprocating air compressor is caused by().

A.leaky discharge valves on the LP cylinder
B.leaky discharge valves on the HP cylinder
C.insufficient intercooler cooling
D.low ambient air pressure


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Most pump manufacturers recommended that the discharge piping for centrifugal pumps be ().

A.one size larger than the pump discharge nozzle
B.the same size as the pump discharge nozzle
C.one size smaller than the pump discharge nozzle
D.installed with a short radius elbow at the pump

2.單項(xiàng)選擇題If a refrigeration compressor is short cycling on high head pressure, you should ().

A.purge the condenser if the waterside is dirty
B.check for proper water flow through the condenser
C.increase the high pressure cutout setting
D.reduce the cooling water flow

3.單項(xiàng)選擇題What color is used to indicate the last shot of anchor chain?()

A.Red
B.White
C.Blue
D.Yellow

4.單項(xiàng)選擇題A vacuum is initially created in a flash type distilling plant by().

A.the flashing of the feed water
B.the condensation of the saltwater feed
C.air ejectors, eductors, or a separate vacuum pump
D.condensation of the distillate

5.單項(xiàng)選擇題A refrigeration unit will tend to short cycle when operating ().

A.under heavy loads
B.during hot gas defrost
C.under light loads
D.during starting conditions

最新試題

An increasing head pressure in a refrigeration system, without any corresponding change in the cooling water inlet temperature, would probably be caused by ().

題型:?jiǎn)雾?xiàng)選擇題

On tank vessels equipped with power operated cargo tank valves, the type of power operator most commonly used is ().

題型:?jiǎn)雾?xiàng)選擇題

A gradual decrease in the discharge pressure of an operating hydraulic pump can be caused by ().

題型:?jiǎn)雾?xiàng)選擇題

Heavy wear in a particular area of the inner circumference of a packing ring may be caused by ().

題型:?jiǎn)雾?xiàng)選擇題

The rate of heat transfer from a hot region to a cold region is affected most by the ().

題型:?jiǎn)雾?xiàng)選擇題

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?()

題型:?jiǎn)雾?xiàng)選擇題

Low compressor head pressure in a refrigeration system can be caused by().

題型:?jiǎn)雾?xiàng)選擇題

Who is responsible for ensuring that someone is assigned to close the watertight doors in an emergency?()

題型:?jiǎn)雾?xiàng)選擇題

If the thermal bulb of an expansion valve is incorrectly placed at the center of the coil instead of the end, it will ().

題型:?jiǎn)雾?xiàng)選擇題

The general purpose of a heat exchanger is to ().

題型:?jiǎn)雾?xiàng)選擇題