“Flooding back” is a condition where the liquid refrigerant （）.

单项选择题Thermal energy in transition is also referred to as （）.

A.heat
B.power
C.horsepower
D.foot-pound

单项选择题Noise in a refrigeration compressor can be caused by （）.

A.worn bearings and piston pins
B.slugging due to flooding back
C.too much oil in circulation
D.All of the above

单项选择题The air charge leaving an intercooler, or after-cooler of an air compressor can be expected to be （）.

A.superheated
B.super-cooled
C.at or below the dew point
D.All of the above

单项选择题Before starting a reciprocating, steam-driven pump that has been idle for a period of time, you should （）.

A.open the steam line mot valve
B.drain the steam cylinder
C.close the steam cylinder drains
D.open the liquid cylinder drains

单项选择题When air becomes trapped in the hydraulic fluid of a steering system, the （）.

A.rudder will respond sluggishly
B.hydraulic rams will over-speed
C.sight glass will show bubbles
D.ram relief valves will lift