Fluid Mechanics

Question: For motion of spherical particles in a stationary fluid, the drag co-efficient in hindered settling compared to that in free settling is
[A].

more

[B].

less

[C].

equal

[D].

more or less, depending on the type of particle

Answer: Option A

Explanation:

No answer description available for this question.

Question: One poise (unit of absolute/dynamic viscosity) is equivalent to one
[A].

gm/cm2. sec.

[B].

gm/cm. sec.

[C].

cm2/sec.

[D].

m2/sec.

Answer: Option B

Explanation:

No answer description available for this question.

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

inverse

[B].

square root

[C].

second power

[D].

first power

Answer: Option B

Explanation:

No answer description available for this question.

Question: In Newton’s law range, the drag co-efficient for the motion of spherical particle in a stationary fluid is
[A].

0.44

[B].

0.044

[C].

4.4

[D].

44

Answer: Option A

Explanation:

No answer description available for this question.

Question: Drag co-efficient for motion of spherical particles in a stationary fluid in the stoke’s law range is
[A].

[B].

[C].

[D].

Answer: Option A

Explanation:

No answer description available for this question.

Question: Air vessel provided in a reciprocating pump
[A].

smoothens the flow by avoiding pulsations.

[B].

increases the volumetric efficiency of the pump.

[C].

saves the pump from the danger of cavitation.

[D].

none of these.

Answer: Option D

Explanation:

No answer description available for this question.

Question: Mach number is the ratio of the speed of the
[A].

fluid to that of the light.

[B].

light to that of the fluid.

[C].

fluid to that of the sound.

[D].

sound to that of the fluid.

Answer: Option C

Explanation:

No answer description available for this question.

Question: For pipe flows, head is proportional to __________ at constant capacity(where, D = pipe diameter).
[A].

1/D

[B].

1/D2

[C].

1/D5

[D].

D2

Answer: Option C

Explanation:

No answer description available for this question.

Question: Low specific speed of a pump implies that, it is a/an __________ pump.
[A].

axial flow

[B].

centrifugal

[C].

mixed flow

[D].

none of these

Answer: Option B

Explanation:

No answer description available for this question.

Question: Centre of pressure in an immersed body is __________ the centre of gravity.
[A].

above

[B].

below

[C].

at

[D].

either above or below; depends on the liquid density

Answer: Option B

Explanation:

No answer description available for this question.