Hydraulic Fluid Mechanics MCQs

Question 1

A triangular section in open cnannel flow will be most eeonornical when the vertex angle at the triangle base point is

Accepted Answer

90?

Answer

30?

Answer

45?

Answer

60?

Question 2

The motion of a fluid is vortex if each particle of the fluid moves in a circular path with the speed which

Accepted Answer

Varies inversely as the distance from centre

Answer

Is constant

Answer

Is directly proportional to distance from centre

Answer

Varies as square of distance from centre

Question 3

The laminar sub-layer acts as

Accepted Answer

An insulating medium

Answer

Good conductor of heat

Answer

Refractory substance

Answer

Heat absorber

Question 4

A mouth-piece can't be used for emptying tanks with large heads because

Accepted Answer

Cavitation occurs at vena contracta

Answer

Vortex is created at vena contracta

Answer

Variation in discharge is high

Answer

Flow-through mouth piece is erratic

Question 5

Gate is an opening

Accepted Answer

In hydraulic structure with regulation provision

Answer

With closed perimeter and of regular form through which water flows

Answer

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

Answer

With partially full flow

Question 6

The value of Coefficient of velocity for a sharp edged orifice is of the order of

Accepted Answer

0.98.

Answer

0.45

Answer

0.62

Answer

0.78

Question 7

The value of coefficient of velocity depends upon

Accepted Answer

Friction at the orifice surface.

Answer

Slope of orifice

Answer

Head of liquid above orifice

Answer

Type of orifice

Question 8

The contraction of area for flow through orifice in tank depends on

Accepted Answer

All of the above

Answer

Shape of orifice

Answer

Size of orifice

Answer

Head in tank

Question 9

In an external mouthpiece, value of coefficient of discharge, if pipe is flowing full, will be

Accepted Answer

1.0.

Answer

0.602

Answer

0.86

Answer

0.98