Fluid Mechanics

Question: Friction produced by the formation of wakes is called the __________ friction.
[A].

disk

[B].

skin

[C].

form

[D].

none of these

Answer: Option C

Explanation:

No answer description available for this question.

Question: For turbulent flow of newtonion fluid in a circular cross-section pipe, the ratio of maximum to average fluid velocity is
[A].

0.5

[B].

1

[C].

0.66

[D].

< 0.5

Answer: Option B

Explanation:

No answer description available for this question.

Question: For laminar flow through a closed conduit
[A].

Vmax = 2Vav

[B].

Vmax = Vav

[C].

Vmax = 1.5Vav

[D].

Vmax = 0.5Vav

Answer: Option A

Explanation:

No answer description available for this question.

Question: With increase in temperature, the vapor pressure of liquids
[A].

increases

[B].

increases linearly

[C].

decreases

[D].

remains constant

Answer: Option A

Explanation:

No answer description available for this question.

Question: In an incompressible flow of fluid, the fluid
[A].

temperature remains constant.

[B].

compressibility is greater than zero.

[C].

density does not change with pressure & temperature.

[D].

is frictionless.

Answer: Option C

Explanation:

No answer description available for this question.

Question: One stoke (unit of kinematic viscosity) is equivalent to
[A].

1 cm2/second

[B].

1 m2/second

[C].

1 gm/cm. second

[D].

1 kg . m/second

Answer: Option A

Explanation:

No answer description available for this question.

Question: With the increase in depth, the hydrostatic pressure in an unaccelerated incompressible fluid (in a constant gravitational field)
[A].

decreases.

[B].

increases linearly.

[C].

increases exponentially.

[D].

remains constant.

Answer: Option B

Explanation:

No answer description available for this question.

Question: Boundary layer exists in flow
[A].

of real fluids.

[B].

over flat surfaces only.

[C].

in pipes only.

[D].

of ideal fluids only.

Answer: Option A

Explanation:

No answer description available for this question.

Question: Laminar flow is characterised by the nonexistence of
[A].

pressure fluctuation.

[B].

eddies.

[C].

deviating velocities.

[D].

all (a), (b)&(c).

Answer: Option D

Explanation:

No answer description available for this question.

Question: In the Newton’s law range, the terminal velocity of a solid spherical particle falling through a stationary fluid mass is __________ the fluid viscosity.
[A].

directly proportional to

[B].

inversely proportional to

[C].

inversely proportional to the square root of

[D].

independent of

Answer: Option B

Explanation:

No answer description available for this question.