单项选择题
The rate of heat transfer between the hot and cold fluids passing through a shell-and-tube type heat exchanger will （）.
A.remain constant along the tubes length
B.be greatest in a single pass counter flow heat exchanger
C.remain constant throughout the heat exchanger
D.vary from section to section through out the heat exchanger
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相关考题
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If the relief valve on the discharge side of a hydraulic pump lifts, the cause could be （）.
A.a low load on the unit
B.a clogged pump suction strainer
C.a blockage in the line between the pump and hydraulic motor
D.the hydraulic motor turning too fast -
单项选择题
A salinity indicator is used to determine the （）.
A.cause of salt contamination
B.location of salt water contamination
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If the suction pressure at the refrigeration compressor is below normal, the cause can be（）.
A.refrigerant overcharge
B.overfeeding by the expansion valve
C.a restricted suction strainer
D.due to short cycling of the compressor
