單項(xiàng)選擇題The clutch band of a constant tensioning mooring winch must be set up tight enough to drive the winch drum and should slip only when （）.

A.excessive loads are placed on the winch
B.minimum pull is being exerted by the winch
C.automatic operation of the winch is desired
D.wire is being retrieved at the maximum rate


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1.單項(xiàng)選擇題The advantages of flash type evaporators, as compared to submerged tube type evaporators, include （）.

A.less internal corrosion because of lower brine density
B.higher temperature evaporation for lower salinity of the distillate produced
C.less scale formation in a flash evaporator
D.less feed-water required for a flash evaporator

2.單項(xiàng)選擇題The （）is used to burn oil sludge.

A.clarifier
B.oil/water separator
C.incinerator
D.distiller

3.單項(xiàng)選擇題Which is the pollution prevention equipment?（）

A.booster pump
B.evaporator
C.incinerator
D.cooler

4.單項(xiàng)選擇題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

5.單項(xiàng)選擇題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