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單項選擇題

One distinct advantage of flash type evaporators, as compared to most other evaporators, is that in a flash evaporator （）.

A.high temperature distillate can be re- circulated to induce additional flashing
B.scale formation is not a severe problem
C.cold shocking is more effective in removing scale
D.water purity is greatly increased at high capacity

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單項選擇題

A liquid indicator sight glass is useful in determining whether or not a refrigeration system is sufficiently chargedIt is generally located in the（）.

A.high pressure liquid line
B.low pressure liquid line
C.high pressure vapor line
D.low pressure vapor line

單項選擇題

Compared to a constant pitch propeller, a controllable pitch propeller（）.

A.more efficiently uses available engine power
B.operates at a lower efficiency at a fixed speed
C.produces the same torque at lower engine power
D.develops its rated power at a lower speed