FLUID MECHANICS QUIZ

Drag force acting on a body does not depend upon the

Density of the body

Velocity of the body

Projected area of the body

Density of the fluid

TRUE ANSWER : ?
YOUR ANSWER : ?

The bulk modulus of elasticity of a liquid

Decreases with pressure

Is zero for incompressible liquid

Increases with pressure

Is independent of temperature & pressure

TRUE ANSWER : ?
YOUR ANSWER : ?

Steady uniform flow is represented by flow through a/an

None of these

Expanding tube at constant rate

Long pipe at constant rate

Long pipe at decreasing rate

TRUE ANSWER : ?
YOUR ANSWER : ?

Delivery of insufficient quantity of liquid by a pump may be caused by

Low rpm

All of these

Air leak in the inlet

Too high a lift

TRUE ANSWER : ?
YOUR ANSWER : ?

Schedule number of a pipe, which is a measure of its wall thickness, is given by

10000 P'/S

1000 S/P'

100 P'/S

1000 P'/S

TRUE ANSWER : ?
YOUR ANSWER : ?

Boiler feed water pump is usually a __________ pump.

Multistage centrifugal

Reciprocating

Diaphragm

Gear

TRUE ANSWER : ?
YOUR ANSWER : ?

If three pipes of different diameters, lengths & friction factors are connected in parallel, then (where, Q = flow rate, V= fluid velocity f = friction factor).

Q = Q₁ + Q₂ + Q₃

Q₁ = Q₂ = Q₃

F = f₁ + f₂ + f₃

V₁ = V₂ = V₃

TRUE ANSWER : ?
YOUR ANSWER : ?

Cavitation in a centrifugal pump can be avoided by keeping the

Outlet pressure high

Outlet pressure low

Inlet pressure low

Inlet pressure high

TRUE ANSWER : ?
YOUR ANSWER : ?

Water hammer is caused, when water flowing in a pipe is suddenly brought to rest by closing the valve. The extent of pressure thus produced due to water hammer depends on the

Fluid velocity in the pipe

Time taken to close the valve

Pipe length

All of these

TRUE ANSWER : ?
YOUR ANSWER : ?

Boundary layer thickness in turbulent flow over a flat plate increases as(where, d = distance from the leading edge.)

d4/5

d1/3

√d

d2/3

TRUE ANSWER : ?
YOUR ANSWER : ?

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