Hydraulic Fluid Mechanics MCQs

Question 1

Weber number is the ratio ofwintertial force to

Accepted Answer

Surface tension

Answer

Gravitational force

Answer

Elasticity

Answer

Viscosity

Question 2

Pressure coefficient is the ratio of pressure force to

Accepted Answer

Inertia force

Answer

Gravity force

Answer

Viscous force

Answer

Surface tension

Question 3

Which of the following is not a dimensionless parameter

Accepted Answer

Kinematic viscosity

Answer

Reynolds number

Answer

Friction factor

Answer

Pressure coefficient

Question 4

The average value of coefficient of velocity is of the order of

Accepted Answer

0.97.

Answer

0.56

Answer

0.78

Answer

0.89

Question 5

The coefficients of discharge, velocity and contraction Cd, Cv, and Cc are related as

Accepted Answer

Cd= Cc X Cv.

Answer

GI= Cy+Cc

Answer

Cd= Cc?Cc

Answer

Cd= Cc/C

Question 6

The value of coefficient of discharge in comparison to coefficient of velocity is

Accepted Answer

Less

Answer

More

Answer

Same

Answer

More/less depending on flow

Question 7

For frictionless fluid, the contraction coefficient for Borda's mouthpiece is

Accepted Answer

0.97

Answer

1

Answer

0.5

Answer

0

Question 8

A mouthpiece can't be used under very large head because of

Accepted Answer

Cavitation problem at vena contracta

Answer

Creation of vortex at vena contracta

Answer

Large variation of discharge

Answer

Erratic flow

Question 9

Weir in an opening

Accepted Answer

With partially full' flow

Answer

With closed perimeter and of regular form through which water flows

Answer

With prolonged sides having length of 2 to 3 diameters of opening in thick wall

Answer

In hydraulic structure with regulation provision