⚙️Mechanical Engineering MCQs
Mechanical Engineering MCQs
488 MCQs221
The region between the separation streamline and the boundary surface of the solid body is known as__________________?
Awake
Bdrag
Clift
Dboundary layer E. aerofoil section
222
The upper surface of a weir over which water flows is known is_____________________?
Acrest
Bnappe
Csill
Dweir top E. contracta
223
Uniform flow occurs when_____________________?
Athe direction and magnitude of the velocity at all points are identical
Bthe velocity of successive fluid paiticles, at any point, is the same at successive periods of time
Cthe magnitude and direction of the velocity do not change from point to point in the fluid
Dthe fluid particles move in plane or parallel planes and the streamline pat-terns are identical in each pleasure E. velocity, depth, pressure, etc. change from point to point in the fluid flow
224
Hydrometer is used to determine____________________?
Aspecific gravity of liquids
Bspecific gravity of solids
Cspecific gravity of gases
Drelative humidity E. density
225
According to Bernoulli’s equation for steady ideal fluid flow____________________?
Aprinciple of conservation of mass holds
Bvelocity and pressure are inversely proportional
Ctotal energy is constant throughout
Dthe energy is constant along a stream-line but may vary across streamlines E. none of the above
226
Mach number is significant in_____________________?
Asupersonics, as with projectiles and jet propulsion
Bfull immersion or completely enclosed flow, as with pipes, aircraft wings, nozzles etc.
Csimultaneous motion through two fluids where there is a surface of dis-continuity, gravity force, and wave making effects, as with ship’s hulls
Dall of fhe above E. none of the above
227
At the center line of a pipe flowing under pressure where the velocity gradient is zero, the shear stress will be_________________?
Aminimum
Bmaximum
Czero
Dnegative value E. could be any value
228
Two pipe systems can be said to be equivalent, when the following quantities are same__________________?
Afriction loss and flow
Blength and diameter
Cflow and length
Dfriction factor and diameter E. velocity and diameter
229
Alcohol is used in manometer, because____________________?
Aits vapour pressure is low
Bit provides suitable meniscus for the inclined tube
Cits density is less
Dit provides longer length for a given pressure difference E. it provides accurate readings
230
The property of fluid by virtue of which it offers resistance to shear is called________________?
Asurface tension
Badhesion
Ccohesion
Dviscosity E. all of the above