单项选择题
The （）is used to burn oil sludge.
A.clarifier
B.oil/water separator
C.incinerator
D.distiller
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单项选择题
Which is the pollution prevention equipment?（）
A.booster pump
B.evaporator
C.incinerator
D.cooler -
单项选择题
Sludge may form in the lubricating oil crankcase of a reciprocating air conditioning compressor as a result of （）.
A.wax precipitation in the lube oil
B.contamination by dust, scale, or moisture
C.refrigerant bubbles in the lube oil
D.refrigerant reducing the lube oil viscosity -
单项选择题
In a chilled water air conditioning unit using a reciprocating compressor, the refrigerating effect of the primary refrigerant can be increased by （）.
A.increasing refrigerant pressure in the coil
B.increasing chilled water flow through the cooler
C.sub-cooling the refrigerant in the condenser
D.superheating the refrigerant in the compressor
