单项选择题
Which of the listed operating conditions would have the greatest effect on the volumetric efficiency of an operating reciprocating air compressor?（）
A.The density of the air entering the compressor
B.The temperature of the air entering the compressor
C.The designed rotating speed of the compressor
D.A leaking head gasket
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相关考题
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单项选择题
In order to distribute the side pressures over a wide area of the cylinder walls and liners, which of the listed types of pistons are used in modem low pressure air compressors?（）
A.Differential
B.Trunk
C.Barrel
D.Valve-in-head -
单项选择题
A cracked diaphragm in a thermostatic expansion valve will cause the valve to （）.
A.return to a neutral position
B.flood the evaporator
C.open
D.close -
单项选择题
If an air compressor is used to supply air primarily to the combustion control system and other pneumatic controllers, the entire system is known as the （）.
A.control air system
B.forced draft air system
C.supply air system
D.ships service air system
