Hydraulic Fluid Mechanics MCQs

Question 1

Drag is defmed as the force component exerted on an immersed object, the component acting in direction

Accepted Answer

Parallel to flow direction

Answer

Normal to flow direction

Answer

At resultant angle

Answer

Radial to flow direction

Question 2

Pressure drag as per boundary layer theory is function of

Accepted Answer

Shape of body and separation of flow.

Answer

Shape of body

Answer

Flow direction

Answer

Separation of flow

Question 3

Bluff body is the body of such a shape that pressure drag as compared to friction drag is

Accepted Answer

More

Answer

Same

Answer

Less

Answer

Zero

Question 4

A body is said to be provided optimum amount of streamlining when

Accepted Answer

Profile drag (i.e., sum of friction drag and pressure drag) is minimum)

Answer

Friction drag is minimum

Answer

Pressure drag is minimum

Answer

Product of friction and pressure drag is minimum

Question 5

The flow of any fluid, real or ideal, must fulfill the following

Accepted Answer

The continuity equation

Answer

Newton's law of viscosity

Answer

Newton's second law of viscosity

Answer

Velocity at boundary must be zero relative to the boundary

Question 6

Turbulent flow generally occurs for cases involving

Accepted Answer

None of the above.

Answer

Very slow motions

Answer

Very narrow passages

Answer

All of the above

Question 7

In turbulent flow

Accepted Answer

The shear stresses are generally larger than in a similar laminar flow

Answer

Fluid particles move in an orderly manner

Answer

Momentum transfer is on a molecular scale only

Answer

Cohesion is more effective than momentum transfer in causing shear stress

Question 8

In laminar flow

Accepted Answer

Newton's law of viscosity applies

Answer

The velocity is of no consideration

Answer

Losses are proportional to square of velocity

Answer

Generally occurs in practice

Question 9

The continuity equation

Accepted Answer

Relates mass rate of flow along a streamline

Answer

Requires that Newton's second law of motion be satisfied at every point in fluid

Answer

Relates the momentum per unit volume for two points on a streamline

Answer

Expresses the relation between energy and work