Hydraulic Fluid Mechanics MCQs

Question 1

Continuity equation relates

Accepted Answer

Mass rate of flow along a streamline

Answer

Conservation of mass and momentum

Answer

Energy and work

Answer

Frictional losses

Question 2

The continuity equation in fluid flow

Accepted Answer

States that the net rate of inflow into small volume must be zero

Answer

States that energy is constant along a streamline

Answer

States that energy is constant every where in the fluid

Answer

Applies to irrotational flow only

Question 3

Head loss in turbulent flow in a pipe

Accepted Answer

Varies approximately as square of velocity

Answer

Varies directly as velocity

Answer

Varies inversely as square of velocity

Answer

Depends upon orientation of pipe

Question 4

The depth of water below the spillway and after hydraulic jump are 1 m and 6 m respectively. The head lost will be

Accepted Answer

1.04 m

Answer

5m

Answer

1.7 m

Answer

2.05 m

Question 5

Bernoulli's theorem is applicable for

Accepted Answer

Perfect incompressible fluid flowing in continuous streams.

Answer

Streamline flow

Answer

Turbulent flow

Answer

Normal flow

Question 6

The shear stress in a fluid flowing in a round pipe

Accepted Answer

Is zero at centre and varies linearly with radius

Answer

Is constant over the cross-section

Answer

Is zero at the wall and increases linearly to the centre

Answer

Varies parabolically across the section

Question 7

Which one is the correct statement

Accepted Answer

Hydraulic grade line may be above or below the centre line of conduit

Answer

Hydraulic grade line should always be above the centre line of conduit

Answer

Hydraulic grade line should always be below the centre line of conduit

Answer

Hydraulic grade line should always the parallel to the centre line of conduit

Question 8

A liquid jet from a nozzle exposed to atmosphere traverses along

Accepted Answer

Parabolic path

Answer

A straight line

Answer

A circular path

Answer

An elliptical path

Question 9

In laminar flow through a round tube, the discharge varies

Accepted Answer

Inversely as the viscosity

Answer

Linearly as the viscosity

Answer

Inversely as the pressure drop

Answer

As the cube of the diameter