题目内容

Whatcausespressuredropinhydraulicsystems?

A. longlengthofpipe
B. friction
C. typeoffluid
D. alloftheabove

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Inapipe,flowrateis3000mL/minandflowvelocityis5cm/s.Thecross-sectionareaofthepipeis:

A. 5cm2
B. 10cm2
C. 15cm2
D. 20cm2

Inapipe,flowrateis9L/minandflowvelocityis0.1m/s.Thecross-sectionareaofthepipeis:

A. 5cm2
B. 10cm2
C. 15cm2
D. 20cm2

Inapipe,flowrateis30L/minandflowvelocityis0.3m/s.Thecross-sectionareaofthepipeis:

A. 10cm2
B. 15cm2
C. 16.7cm2
D. 20cm2

Mostoftheenergynotusedtomovetheloadinahydraulicsystemturnsinto().

A. light
B. potential
C. heat
D. noneoftheabove