Keeps the refrigerated space cooler
Reduces the efficiency of the plant
Takes the load off the compressor
Has no affect on the system
第1题：
Shortage of refrigerant oil
Slight shortage of refrigerant
Excessive condenser cooling water flow
Faulty expansion valve
第2题：
Dirty lube oil filter
Too much piston ring wear
High lube oil viscosity
Low lube oil temperature
第3题：
Of all the extingushing agents listed below, which one has the greatest capacity for heat absorption?______.
A.Water fog
B.Carbon dioxide
C.Dry chemical
D.Solid stream of water
第4题：
Loss of compression for that cylinder
Misfiring or rough running
Damage to the valve
All of the above
第5题：
Chilled water system supply temperature
Chilled water system return temperature
Compressor discharge temperature
Compressor suction pressure
第6题：
Overcoming sliding friction
Overcoming rolling friction
Overcoming fluid friction
Overcoming oil wedge friction
第7题：
Lube oil passing through the system
Moisture or foreign matter collecting at the valve seat and orifice
Variable spring tension caused by the changing temperature
Frost on the liquid line
第8题：
Which of the listed conditions can be considered as the single greatest cause of accidents?
A.Speed
B.Excessive knowledge or skill
C.Human error
D.Excitement
第9题：
Exhaust temperature
Lube oil level
Lube oil pressure
Water level in the expansion tank
第10题：
Dull black appearance
Bright appearance
Thin layer of lacquer
Thick oily film