超星 - Flowing fluid - 查题吧

单选题

Whatcausespressuredropinhydraulicsystems?

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

单选题

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

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

单选题

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

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

单选题

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

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

单选题

Mostoftheenergynotusedtomovetheloadinahydraulicsystemturnsinto().

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

单选题

Thepictureshowsapipewithdifferentsectionalarea.CompareflowvelocityvandflowrateQoffluidatdifferentsections.

A. v2>v3>v1;Q1=Q2=Q3
B. v1>v3>v2;Q1=Q2=Q3
C. v1=v2=v3;Q2>Q3>Q1
D. v1=v2=v3;Q1>Q3>Q2

判断题

Lowviscosityfluidsconsumemorepower.

A. 对
B. 错

判断题

Atatmosphericpressure,oilviscositydecreasesastemperaturerises.

A. 对
B. 错

判断题

Atlowpressures,liquidsarenon-compressible.

A. 对
B. 错

判断题

Anyfluidcanbecompressedwhenextremelylargepressureisapplied.

A. 对
B. 错

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