Hydraulic Fluid Mechanics MCQs

Question 1

The most economical section of circular channel for maximum discharge is obtained when

Accepted Answer

Any one of the above

Answer

Depth of water = 0.95 d

Answer

Wetted perimeter = 2.6 d

Answer

Hydraulic mean depth = 0.29 d

Question 2

The flow in venturiflume takes place at

Accepted Answer

Atmospheric pressure

Answer

At pressure greater than atmospheric pressure

Answer

Vacuum

Answer

High pressure

Question 3

Any fluid flow follows

Accepted Answer

Continuity equation

Answer

Bernoulli's equation

Answer

Newton's law of viscosity

Answer

Darcy's equation

Question 4

The velocity distribution in the turbulent boundary layer follows

Accepted Answer

Logarithmic law

Answer

Straight line law

Answer

Parabolic law

Answer

Hyperbolic law

Question 5

Laminar flow occurs in pipes, when Reynolds number

Accepted Answer

Is less than 2000

Answer

Lies between 2000-3000

Answer

Lies between 3000-4000

Answer

Is more than 2000

Question 6

Which of the following pipe bends will introduce maximum head loss

Accepted Answer

90? bend

Answer

300 bend

Answer

U-bend

Answer

60? bend

Question 7

In pipes larger than 25 mm, carrying water, the laminar flow

Accepted Answer

Rarely exists

Answer

Very often exists

Answer

Generally exists

Answer

Unpredictable

Question 8

The path of jet discharging from bottom opening in a tank full of water will be

Accepted Answer

Parabola with its vertex at the opening

Answer

Horizontal straight line

Answer

Linearly downward

Answer

Approximately hyperbola

Question 9

13orda's mouthpiece is

Accepted Answer

A short cylindrical tube projecting inward, having length of 1/2 diameter

Answer

A convergent tube having length of 2-3 diameters

Answer

Most commonly used

Answer

Rarely used