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單項(xiàng)選擇題

Hydraulic machinery failures are commonly caused by misalignment of the system components and by （）.

A.hydraulic fluid contamination
B.excessive fluid friction
C.turbulent fluid flow
D.fluid pressure surges

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單項(xiàng)選擇題

Air compressor receivers should be “blown down” at least （）.

A.yearly
B.quarterly
C.monthly
D.daily

單項(xiàng)選擇題

A thermostatic expansion valve is properly controlling evaporator superheatAdjusting this valve to lower the superheat will result in a/an （）.

A.evaporator pressure decrease
B.evaporator coil over-feed
C.evaporator capacity increase
D.expansion valve diaphragm rupture