Air trapped in the hydraulic fluid of a steering system should be indicated by （）.

单项选择题Overgreasing of ball bearings installed on pumps will result in （）.

A.smoother pump operation
B.overheating of the bearing
C.reduced corrosion in the bearing
D.increased pump capacity

单项选择题The energy associated with molecules is known as （）.

A.kinetic energy
B.potential energy
C.mechanical energy
D.thermal energy

单项选择题“Flooding back” is a condition where the liquid refrigerant （）.

A.vaporizes in the condenser
B.reaches the compressor through the suction line
C.flashes in the liquid line
D.condenses in the receiver

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