Fluid Mechanics

Question: A mono pump is a __________ pump.
[A].

centrifugal

[B].

piston

[C].

positive acting rotary

[D].

a group of vacuum

Answer: Option C

Explanation:

No answer description available for this question.

Question: Characteristic curves for a centrifugal pump plotted against its capacity is shown in the diagram. x, y and z denote respectively
[A].

efficiency, head and B.H.P.

[B].

head, efficiency and B.H.P.

[C].

B.H.P., efficiency and head

[D].

efficiency, B.H.P. and head

Answer: Option B

Explanation:

No answer description available for this question.

Question: Deformation drag, which is caused by widespread deformation of fluid around the immersed body
[A].

occurs when NRe is very small.

[B].

is primarily a friction drag.

[C].

is independent of body length.

[D].

depends mainly on cross-sectional shape.

Answer: Option A

Explanation:

No answer description available for this question.

Question: In case of a pipe of constant cross-sectional area, the maximum fluid velocity obtainable is
[A].

the velocity of sound.

[B].

dependent on its cross-sectional area.

[C].

dependent on fluid viscosity.

[D].

dependent on fluid density.

Answer: Option A

Explanation:

No answer description available for this question.

Question: Laminar flow of a Newtonion fluid ceases to exist, when the Reynolds number exceeds
[A].

4000

[B].

2100

[C].

1500

[D].

3000

Answer: Option B

Explanation:

No answer description available for this question.

Question: For the production of very high vacuum, a __________ pump is normally used.
[A].

diffusion

[B].

centrifugal

[C].

jet ejector

[D].

piston

Answer: Option A

Explanation:

No answer description available for this question.

Question: For the free settling of a spherical particle through a fluid, the slope of, CD-log NRe , plot is
[A].

1

[B].

-1

[C].

0.5

[D].

-0.5

Answer: Option B

Explanation:

No answer description available for this question.

Question: With increase in the shear rate, the apparent viscosity of pseudoplastic fluids
[A].

increases

[B].

decreases

[C].

remains same

[D].

may increase or decrease; depends on the magnitude of shear rate

Answer: Option B

Explanation:

No answer description available for this question.

Question: With diminishing cross-sectional area in case of subsonic flow in a converging nozzle, the
[A].

velocity increases

[B].

pressure decreases

[C].

both (a) & (b)

[D].

neither (a) nor (b)

Answer: Option C

Explanation:

No answer description available for this question.

Question: For turbulent fluid flow in pipe, the expression for Prandtl one seventh power law is (where, r = pipe radius, x = distance).
[A].

V/Vmax = (x/r)1/7

[B].

V/Vmax = (r/x)1/7

[C].

V/Vmax = (x.r)1/7

[D].

none of these

Answer: Option A

Explanation:

No answer description available for this question.