题目内容

Foragearpump,

A. asoutputpressureincreases,overallefficiencydecreases
B. asoutputpressureincreases,overallefficiencyincreases
C. overallefficiencyisnotaffectedbyoutputpressure
D. noneoftheabove

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Gearpumpscanbe

A. onlyfixeddisplacement
B. onlyvariabledisplacement
C. bothfixedandvariabledisplacement
D. noneoftheabove

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Whatistherelationbetweenspeedandactualdisplacementforagearpump?

Actualdisplacementincreaseswithrotorspeeddown
B. Actualdisplacementdecreaseswithrotorspeedup
C. Actualdisplacementisconstantanddoesnotchangewithchangeinspeed
D. Noneoftheabove

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Whatistheadvantageofexternalgearpumps?

A. highpressureofoutput
B. smoothandquiet
C. lowcostofproduction
D. Noneoftheabove

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Gearpumpsarefixeddisplacementpumps.

A. 对
B. 错

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Foragearpump,

A. asoutputpressureincreases,overallefficiencydecreases B. asoutputpressureincreases,overallefficiencyincreases C. overallefficiencyisnotaffectedbyoutputpressure D. noneoftheabove

Gearpumpscanbe

Whatistherelationbetweenspeedandactualdisplacementforagearpump?

Whatistheadvantageofexternalgearpumps?

Gearpumpsarefixeddisplacementpumps.

A. asoutputpressureincreases,overallefficiencydecreases
B. asoutputpressureincreases,overallefficiencyincreases
C. overallefficiencyisnotaffectedbyoutputpressure
D. noneoftheabove