FLUID MECHANICS (MEE3003) QUIZ #l: Toples 01-02: Definitions in Fiald Mechanics,
ID: 1885451 • Letter: F
Question
FLUID MECHANICS (MEE3003) QUIZ #l: Toples 01-02: Definitions in Fiald Mechanics, Premure Meinrements BEng 2-2018/19:SEM1 I. On yoar Answer Scan Sheets, completely fill all sirsles conresponding to the currect ienswers 2. It is recommended that you usc a pencil so that you can erase errocs, if necessary 3. Questions may have multiple answers. In such cases, select all the correct answers ) Which of the following are trae about all floid? A It has densely spaced [2 C Sticks to the solid boundary E Occupies the entire volme of lecules with large inter D Deforms continuously when acted on by a shearing stress their container F Are treated as a continuum or analysis molecular cohesive forces 8 Are Compressible 2) Which of the following are primary quamtities A Pressure B Mass 12 mark] C Length D Timo E Velocity F Tempernture 3) Which of the following physical quancities match their basic dimensian A Density B Acceleration C Force [2 marks] FPressure D EnergyE Surface Tension MLT FL'T LT MLT MT 4) If atmospheric presure is I atm, which of the following is the same as 70 kPa? [2 marks A 0.6908 atm B 10.15 psia C 4.543 pounds per square inch of vacuum D -31325 Pa E 0 0TMPa F 7 bar marks 5) The slope of a stress vs velocity gradient graph represents A density B velocity Ckinematic D dynamic E newtonian F Fluid viscesityviscosity luid acceleration 14 mark.) 6) Which of the following can be used to measure fluid pressure? A Piezometer tube B U-Tube Manometer C Rotameter D Bourdon Gauge E Bellows Gauge F Diaphragm GaugeExplanation / Answer
1) A) True. Fluids have densely spaced molecules with high vohesive force. Due to this cohesive force fluid molecules gets intact to each other.
B) False. All fluids are incompressible as its density changes negligible when dedormed.
C) False. Fluids do not stick to surface as they have low adhesive force and high cohesive force.
D) True. Continuos deformation occurs in fluids thus rate of deformation is considered for evaluation.
E) False. Entire volume of container is occupied by air not fluid.
F) True. Fluids are treated as continum with no voids or empty space.
2) Primary quantity are the quantities which have independent dimension. Thus they are length, mass, time and temperature.
3) density = ML-3.
Acceleration = LT-2.
Force= MLT-2.
Energy= ML2T2.
Surface tension= MT-2
Pressure= ML-1T-2.
4) 70 kpa= 0.6908 atm.
70 kpa= 70000pa.
70 kpa=10.152 psia.
70kpa= 0.07 mpa.
70 kpa= 10.152 psi.
70 kpa= 0.6 bar.
5) Newtonian fluids behaves according to law that shear stress is directly proportion to velocity gradient. Thus slope represent dynamic viscosity.
Answer (d).
6) Rotameter measures volumetric flow rate in closed tube.
Rest all options are used to measure pressure in fluid.
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