Mechanical Engineering MCQs

Page No. 27

Operation of McLeod gauge used for low pressure measurement is based on the principle of_________________?


agas law


bBoyle’s law


cCharle’s law


dPascal’s law


View Answer Boyle’s law

The rise or depression of liquid in a tube due to surface tensionwim increase in size of tube will________________?


aincrease


bremain unaffected


cmay increase or decrease depending on the characteristics of liquid


ddecrease


View Answer decrease

The units of dynamic or absolute viscosity are__________________?


ametres2 per sec


bkg sec/meter


cnewton-sec per meter


dnewton-sec2 per meter


View Answer newton-sec per meter

The property by virtue of which a liquid opposes relative motion between its different layers is called_________________?


asurface tension


bco-efficient of viscosity


cviscosity


dosmosis


View Answer viscosity

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



The capillary rise at 20°C in a clean glass tube of 1 mm bore containing water is approximately____________________?


a1 mm


b5 mm


c10 mm


d30 mm


View Answer 30 mm

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


View Answer both of die above

A bucket of water is hanging from a spring balance. An iron piece is suspended into water without touching sides of bucket from another support. The spring balance reading will_________________?


aincrease


bdecrease


cremain same


dincrease/decrease depending on depth of immersion


View Answer remain same

A pressure of 25 m of head of water is equal to_________________?


a25 kN/m2


b245 kN/m2


c2500 kN/m2


d2.5kN/m2


View Answer 245 kN/m2

A one dimensional flow is one which_________________?


ais uniform flow


bis steady uniform flow


ctakes place in straight lines


dinvolves zero transverse component of flow



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