Hot gas bypass is one of the methods used to _________.A.relieve excessive compressor head

rresponding to the existing condensing temperature in a refrigeration system, you should _____.

A.increase the flow of the cooling water through the condenser

B.adjust the high pressure cutout to maintain the desired pressure

C.open the hot gas bypass temporarily to reduce capacity

D.purge non-condensable gases to reduce the excess pressure

A.bypass exhaust gas at high loads to prevent excessive back pressure

B.bypass a portion of the exhaust gas at peak loads for better efficiency

C.recycle exhaust gas to the turbocharger

D.minimize moisture condensation in the boiler gas passages at low loads

system by the tank isolation valve？

A.The tank must be gas freed

B.The tank must be ballasted

C.The tank must be vented to the atmosphere

D.The bypass valve must also be closed

A．The tank must be gas freed

B．The tank must be ballasted

C．The tank must be vented to the atmosphere

D．The bypass valve must also be closed

In a full flow type lube oil system, the bypass relief valve will lift due to .

A.a clogged filter element

B.excessive lube oil pump discharge pressure

C.excessive lube oil flow

D.excessively hot lube oil

部分气体冷却后返送到压缩机进口的调节方法。The air volume required by production is smaller than that of the compressor, and the excess gas is sent back to the compressor inlet after cooling.

to _________.

A.prevent engine back pressure at heavy loads

B.increase total engine efficiency at low loads

C.prevent boiler corrosion at low engine loads

D.improve engine fuel consumption at any load

Hot gas defrosting uses the hot gas from _____ to defrost the evaporator.

A.starting air bottles

B.diesel engines

C.boilers

D.refrigeration compressors

A．Gas produced by metal and coal.

B．Air kept hot by burning coal.

C．Hydrogen heated by a gas burner.

D．Natural gas carried in a metal container.