流体力学英文题目(2),9.When the pipeinstallation changes from horizon

流体力学英文题目(2),
9.When the pipeinstallation changes from horizontal to vertical position and the velocitykeeps unchanged,the frictional loss will be .
A）.increased; B）.decreased; C）.the same; D）.uncertain
10.Fluid flows throughthe pipe at low flow rates,when the velocity rises in double time,thepressure drop in the fluid will( ).
11.For Newtonianfluids,if the typeof flow through the pipe is laminar flow,then its characteristics are:__________________________________；_______________________；________________________.
12.For given dust system the capacity of gravity settling chamber dependson ( )
A) The height and length ofchamber
B) height of chamber
C) The bottom area of chamber
D) Volume of chamber
13.For constant pressure filtration,if the filtering medium (septum)resistance is ignored,the filtering time is double and other operatingconditions keep unchanged,the filtrate volume will be （ ）
（A）double; (B) half of original; (C) 21/2 of original; (D) uncertain
14.The critical diameter implies for the performance of cyclone旋风分离器 .
(A) minimum diameter of particleremoved completely by cyclone
(B) diameter of cyclone for maximum separationefficiency
(C) maximum diameter of particle tomaintain laminar flow
(D) minimum diameter of particleleaving the cyclone