Fluid Mechanics

Question: Co-efficient of discharge (Cd) is defined as actual discharge/theoretical discharge and is equal to Cc . Cv; where Cc = Co-efficient of contraction and Cv = co-efficient of velocity. Cd of an orifice is usually about
[A].

0.42

[B].

0.62

[C].

0.82

[D].

0.98

Answer: Option B

Explanation:

No answer description available for this question.

Question: Nature of fluid flow during the opening of a valve in a pipeline is
[A].

laminar

[B].

unsteady

[C].

steady

[D].

uniform

Answer: Option B

Explanation:

No answer description available for this question.

Question: The buoyant force acting on a floating body is dependent on the
[A].

viscosity of the liquid.

[B].

weight of the liquid displaced.

[C].

depth of immersion of the body.

[D].

surface tension of the liquid.

Answer: Option B

Explanation:

No answer description available for this question.

Question: Drag force acting on a body does not depend upon the
[A].

density of the fluid.

[B].

density of the body.

[C].

velocity of the body.

[D].

projected area of the body.

Answer: Option B

Explanation:

No answer description available for this question.

Question: __________ forces do not act in case of fluid flow.
[A].

Elastic

[B].

Tensile

[C].

Vibratory

[D].

Centrifugal

Answer: Option B

Explanation:

No answer description available for this question.

Question: Cavitation can be prevented by
[A].

suitably designing the pump.

[B].

maintaining the suction head sufficiently greater than the vapour pressure.

[C].

maintaining suction head = developed head.

[D].

maintaining suction head lower than the vapour pressure.

Answer: Option B

Explanation:

No answer description available for this question.

Question: Efficiency of power transmission (η) through a circular pipe is given by (ht – hf)/ht, which has a maximum value of __________ percent.
[A].

33:3

[B].

50

[C].

66.6

[D].

88.8

Answer: Option C

Explanation:

No answer description available for this question.

Question: Location of vena-contracta in an orificemeter does not depend upon the
[A].

type of orifice.

[B].

density, viscosity & compressibility of the fluid.

[C].

ratio of pipe diameter to orifice diameter.

[D].

pipe roughness.

Answer: Option A

Explanation:

No answer description available for this question.

Question: Hydrometer measures the specific gravity of liquids based on the principles of buoyancy. Pycnometer is used to measure the specific gravity of
[A].

powder & grannular solids

[B].

liquids

[C].

low melting point semi-solids

[D].

all ‘a’, ‘b’ & ‘c’

Answer: Option D

Explanation:

No answer description available for this question.

Question: Working principle of manometer comprises of balancing a coloumn of liquid against the pressure to be measured. Inclined tube manometer is especially used for the measurement of __________ pressure.
[A].

small differential

[B].

atmospheric

[C].

absolute

[D].

gage

Answer: Option A

Explanation:

No answer description available for this question.