Fluid Mechanics

Question: A fluid is a substance, that
[A].

has to be kept in a closed container.

[B].

is almost incompressible.

[C].

has zero shear stress.

[D].

flows when even a small shear is applied to it.

Answer: Option D

Explanation:

No answer description available for this question.

Question: Which of the following options will facilitate the achievement of a very high head (say 30 metres) in case of a centrifugal pump?
[A].

Increasing the impeller speed and the volute area.

[B].

Increasing the number of vanes in the impeller.

[C].

Mounting of two or more impellers in series on a single shaft.

[D].

Either of (a), (b) or (c).

Answer: Option C

Explanation:

No answer description available for this question.

Question: A special type of liquid transporting device is the diffuser pump, in which __________ are minimised.
[A].

bearing losses

[B].

disk friction

[C].

shock losses

[D].

cavitation

Answer: Option C

Explanation:

No answer description available for this question.

Question: __________ pump is the most suitable device for discharging a liquid against a pressure of ≥ 1500 kgf/cm2.
[A].

Centrifugal

[B].

Piston

[C].

Plunger

[D].

Vane

Answer: Option C

Explanation:

No answer description available for this question.

Question: It is possible to integrate an automatic flow controller to a
[A].

flow nozzle

[B].

venturimeter

[C].

rotameter

[D].

none of these

Answer: Option C

Explanation:

No answer description available for this question.

Question: In case of a rotameter, the density of the float material is __________ that of the liquid it replaces.
[A].

more than

[B].

less than

[C].

equal to

[D].

either (a) or (b)

Answer: Option A

Explanation:

No answer description available for this question.

Question: Open channel liquid flow is most conveniently measured by a
[A].

hot wire anemometer

[B].

notch

[C].

rotameter

[D].

segmental orifice

Answer: Option B

Explanation:

No answer description available for this question.

Question: In case of venturimeters, friction losses are about __________ percent of maximum velocity head.
[A].

2

[B].

8

[C].

12

[D].

20

Answer: Option A

Explanation:

No answer description available for this question.

Question: A fluid whose apparent viscosity increases with shear rate is termed as the __________ fluid.
[A].

Newtonion

[B].

viscous

[C].

dilatant

[D].

non-viscous

Answer: Option C

Explanation:

No answer description available for this question.

Question: In case of coutte flow, the fluid flow is between two large flat parallel plates with
[A].

top plate moving and the bottom plate fixed.

[B].

bottom plate moving and the top plate fixed.

[C].

both the plates fixed.

[D].

both the plates moving.

Answer: Option A

Explanation:

No answer description available for this question.