fluid mechanics mechanical engineering MCQs – Page 2

Practise focused fluid mechanics mechanical engineering questions with marked answers for exam preparation and subject revision.

fluid mechanics mechanical engineering Mcqs
21. An open vessel of water is accelerated up an inclined plane. The free water surface will__________________?
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A. any one of above is possible

B. none of the above

C. be horizontal

D. make an angle in opposite direction to inclination of inclined plane

E. make an angle in direction of inclination of inclined plane

22. In order to increase sensitivity of U-tube manometer, one leg is usually inclined by angle 9. Sensitivity of inclined tube to sensitivity of U-tube is equal to________________?
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A. sin 9

B. cas 9

C. cos 9

D. sin 9

E. tan 9

23. Metacentre is the point of intersection of _________________________?
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A. vertical upward force through e.g. of body and center line of body

B. none of the above

C. buoyant force and the center line of body

D. all of the above

E. mid point between e.g. and center of buoyancy

24. The flow in which the velocity vector is identical in magnitude and direction at every point, for any given instant, is known as________________?
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A. streamline flow

B. steady flow

C. uniform flow

D. one dimensional flow

E. turbulent flow

25. For measuring flow by a venturimeter, if should be installed in __________________?
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A. inclined line with flow downward

B. horizontal line

C. inclined line with upward flow

D. in any direction and in any location

E. vertical line

26. Pitot tube is used for measurement of_________________?
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A. viscosity

B. flow

C. dsscharge

D. pressure

E. velocity
27. Froude number is significant in__________________?
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A. full immersion or completely enclosed flow, as with pipes, aircraft wings, nozzles etc.

B. none of the above

C. supersonics, as with projectile and jet propulsion

D. simultaneous motion through two fluids where there is a surface of dis-continuity, gravity forces, and wave making effect, as with ships hulls

E. all of the above

28. Ratio of inertia force to surface Jension is known as ___________________?
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A. Webers number

B. none of the above

C. Mach number

D. Froude number

E. Reynolds number

29. The units of kinematic viscosity are____________________?
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A. newton-sec per metre

B. none of the above

C. metres2 per sec

D. newton-sec per metre

E. kg sec/metre

30. Which of the following instrument can be used for measuring speed of an aeroplane___________________?
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A. pitot tube

B. hot wire anemometer

C. rotameter

D. Venturimeter

E. Orifice plate

31. Mercury does not wet glass. This is due to property of liquid known as__________________?
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A. adhesion

B. viscosity

C. cohesion

D. surface tension

E. compressibility

32. The property by virtue of which a liquid opposes relative motion between its different layers is called_________________?
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A. co-efficient of viscosity

B. viscosity

C. cohesion

D. osmosis

E. surface tension

33. A piece of metal of specific gravity 7 floats in mercury of specific gravity 13.6. What fraction of its volume is under mercury ?
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A. 0.5

B. 0.515

C. none of the above

D. 0.4

E. 0.5

34. Gradually varied flow is__________________?
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A. steady uniform

B. non-steady uniform

C. steady non-uniform

D. true one-dimensional

E. non-steady non-uniform

35. The pressure in the air space above an oil (sp. gr. 0.8) surface in a tank is 0.1 kg/cm. The pressure at 2.5 m below the oil surface will be __________________?
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A. 3 metres of water column

B. none of the above

C. 4 m of water column

D. 3.5 metres of water column

E. 2 metres of water column

36. At the center line of a pipe flowing under pressure where the velocity gradient is zero, the shear stress will be_________________?
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A. zero

B. minimum

C. could be any value

D. maximum

E. negative value

37. The total energy of each particle at various places in the case of perfect incompres sible fluid flowing in continuous sream__________________?
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A. keeps on increasing

B. may increase/decrease

C. keeps on decreasing

D. unpredictable

E. remains constant
38. In the case of steady flow of a fluid, the acceleration of any fluid particle is________________?
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A. never zero

B. zero

C. variable

D. zero under limiting conditions

E. constant

39. Uniform flow occurs when ___________________?
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A. size and shape of the cross section in a particular length remain constant

B. the flow is streamline

C. size and cross section change uniformly along length

D. flow occurs at constant fate

E. the flow is steady

40. Cavitation will begin when__________________?
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A. the pressure at any location reaches an absolute pressure equal to the saturated vapour pressure of the liquid

B. none of the above

C. flow is increased

D. pressure becomes more than critical pressure

E. pressure is increased