Hydraulic Fluid Mechanics MCQs

Question 1

The hydraulic grade line is

Accepted Answer

The velocity head below the energy grade line

Answer

Always moving up

Answer

Always moving down

Answer

Always above the energy grade line

Question 2

The rise of liquid along the walls of a revolving cylinder above the initial level

Accepted Answer

Is the same as the depression of the liquid at the axis of rotation

Answer

Is greater than the depression of the liquid at the axis of rotation

Answer

Is lesser than the depression of the liquid at the axis of rotation

Answer

It depends upon the magnitude of speed

Question 3

When a liquid rotates at constant angular velocity about a vertical axis as a rigid body, the pressure

Accepted Answer

Varies as the square of the radial distance

Answer

Increases linearly as its radial distance

Answer

Varies inversely as the altitud'2 along any vertical line

Answer

Decreases as the square of radial distance

Question 4

Total pressure on the top of a closed cylindrical vessel completely filled with

Accepted Answer

(c) (radius)3

Answer

Liquid, is directly proportional to

Answer

(a) radius

Answer

(b) (radius)2

Question 5

If the particles of a fluid attain such velocities that velocities vary from point to point in magnitude and direction, as well as from instant to instant, the flow is sail to be

Accepted Answer

Turbulent flow

Answer

Disturbed flow

Answer

Turbid flow

Answer

Non-uniform flow

Question 6

The included angle of triangular notch for maximum discharge is

Accepted Answer

90?

Answer

45?

Answer

600

Answer

108?

Question 7

Most efficient channel section is

Accepted Answer

Half hexagon in form of trapezoid

Answer

Triangular

Answer

Rectangular

Answer

Semi-circular

Question 8

If flow in an open channel is gradually varied, then the flow will be

Accepted Answer

Steady non-uniform flow

Answer

Steady uniform flow

Answer

Unsteady uniform flow

Answer

Unsteady non-uniform flow.

Question 9

The width of the weir with end contraction is

Accepted Answer

Less than the width of channel

Answer

More than the width of channel

Answer

Equal to width of channel

Answer

Half the width of channel