FLUID MECHANICS QUIZ

For a stable equilibrium of a submerged body (where, G and B are centres of gravity & buoyancy respectively).

B & G coincide

G is above B

None of these

B is above G

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).

F = f₁ + f₂ + f₃

V₁ = V₂ = V₃

Q₁ = Q₂ = Q₃

Q = Q₁ + Q₂ + Q₃

TRUE ANSWER : ?
YOUR ANSWER : ?

A stream line is

Always the path of particle

Drawn normal to the velocity vector at every point

A line connecting the mid points of flow cross-section

Fixed in space in steady flow

TRUE ANSWER : ?
YOUR ANSWER : ?

The terminal velocity of a solid spherical particle falling through a stationary fluid mass in the Stoke's law range is proportional to the

Difference in the densities of the particle & fluid

All of these

Square of particle size

Inverse of fluid viscosity

TRUE ANSWER : ?
YOUR ANSWER : ?

Which of the following is the most common pump for pumping either raw sewage or sludge?

Electromagnetic pump

Reciprocating pump

Gear pump

Centrifugal pump

TRUE ANSWER : ?
YOUR ANSWER : ?

For an incompressible fluid, the bulk modulus of elasticity is

1 N

0 N/m

5 kg/m³

∞ N/m²

TRUE ANSWER : ?
YOUR ANSWER : ?

The value of critical Reynolds number for pipe flow is

None of these

10000

1300

100000

TRUE ANSWER : ?
YOUR ANSWER : ?

Volume of liquid displaced by a floating body is equivalent to its

Own weight

Submerged weight

Submerged volume

Own volume

TRUE ANSWER : ?
YOUR ANSWER : ?

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

All of these

Air leak in the inlet

Low rpm

Too high a lift

TRUE ANSWER : ?
YOUR ANSWER : ?

For Laminar flow through a packed bed, the pressure drop is proportional to (Vs is the superficial liquid velocity and Dp is the particle diameter)

Vs²/Dp³

Vs/Dp²

Vs²/Dp²

Vs/Dp³

TRUE ANSWER : ?
YOUR ANSWER : ?

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