⚙️Mechanical Engineering MCQs
Mechanical Engineering MCQs
488 MCQs121
If the surface of liquid is convex, men ___________________?
Acohesion pressure is negligible
Bcohesion pressure is decreased
Ccohesion pressure is increased
Dthere is no cohesion pressure E. none of the above
122
Rain drops are spherical because of__________________?
Aviscosity
Bair resistance
Csurface tension forces
Datmospheric pressure E. none of the above
123
The angle of contact in case of a liquid depends upon___________________?
Athe nature of the liquid and the solid
Bthe material which exists above the free surface of the liquid
Cboth of die above
Dany one of the above E. none of die above
124
The conditions for the stable equilibrium of a floating body are___________________?
Athe meta-center should lie above the center of gravity
Bthe center of buoyancy and the center of gravity must lie on the same vertical line
Ca righting couple should be formed
Dall the above are correct E. none of the above is correct
125
The point in the immersed body through which the resultant pressure of the liquid may be taken to act is known as_________________?
Ameta center
Bcenter of pressure
Ccenter of buoyancy
Dcenter of gravity E. none of the above
126
A liquid would wet the solid, if adhesion forces as compared to cohesion forces are________________?
Aless
Bmore
Cequal
Dless at low temperature and more at high temperature E. there is no such criterion
127
Non uniform flow occurs when_________________?
Athe direction and magnitude of the velocity at all points are identical
Bthe velocity of successive fluid particles, at any point, is the same at successive periods of time
Cthe magnitude aricf 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 plane E. velocity, depth, pressure, etc. change from point to point in the fluid flow
128
An ideal flow of any fluid must satisfy __________________?
APascal law
BNewton’s law of viscosity
Cboundary layer theory
Dcontinuity equation E. Bernoulli’s theorem
129
Flow of water in a pipe about 3 metres in diameter can be measured by__________________?
Aorifice plate
Bventuri
Crotameter
Dpitot tube E. nozzle
130
Addition of lead and bismuth to aluminium results in_________________?
Aimprovement of casting characteristics
Bimprovement of corrosion resistance
Cone of the best known age and precipitation-hardening systems
Dimproving machinability E. none of the above