Fluid Mechanics

Question: Creeping flow around a sphere is defined, when particle Reynolds number is
[A].

< 2100

[B].

< 0.1

[C].

> 2.5

[D].

< 500

Answer: Option B

Explanation:

No answer description available for this question.

Question: Equivalent length of a pipe fitting is
[A].

dependent on Reynolds number.

[B].

independent of Reynolds number.

[C].

dependent on the length of the pipe.

[D].

none of these.

Answer: Option A

Explanation:

No answer description available for this question.

Question: At a constant speed of the centrifugal pump . it __________ the impeller diameter.
[A].

capacity varies directly with

[B].

head varies as the square of

[C].

horsepower varies as the cube of

[D].

all (a), (b) and (c)

Answer: Option D

Explanation:

No answer description available for this question.

Question: With a constant diameter impeller of a centrifugal pump
[A].

its capacity varies directly as the square of speed.

[B].

head varies as the square of speed.

[C].

horsepower input varies as the square of speed.

[D].

head varies as the speed.

Answer: Option B

Explanation:

No answer description available for this question.

Question: A centrifugal pump designed to pump water is employed to pump a more viscous oil. In the later case, the pump
[A].

develops a lower head.

[B].

capacity is reduced.

[C].

requires more power.

[D].

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

Answer: Option D

Explanation:

No answer description available for this question.

Question: Mass velocity is independent of temperature & pressure, when the flow is
[A].

unsteady through unchanged cross-section.

[B].

steady through changing cross-section.

[C].

steady and the cross-section is unchanged.

[D].

unsteady and the cross-section is changed.

Answer: Option C

Explanation:

No answer description available for this question.

Question: Cavitation in a centrifugal pump results from
[A].

high discharge pressure

[B].

low barometric pressure

[C].

high discharge velocity

[D].

high discharge rate

Answer: Option B

Explanation:

No answer description available for this question.

Question: Check in a centrifugal pump is
[A].

provided in the discharge line.

[B].

generally a globe valve.

[C].

provided to prevent liquid from backing up through the pump when the pump is turned off or accidently stops running.

[D].

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

Answer: Option D

Explanation:

No answer description available for this question.

Question: Fanning friction factor equation applies to the __________ fluid flow.
[A].

non-isothermal condition of

[B].

compressible

[C].

both (a) and (b)

[D].

neither (a) nor (b)

Answer: Option D

Explanation:

No answer description available for this question.

Question: With increase in the schedule number of a pipe of a particular nominal size, the
[A].

wall thickness also increases.

[B].

I.D. of the pipe decreases.

[C].

O.D. of the pipe remains constant.

[D].

all (a), (b) and (c)

Answer: Option D

Explanation:

No answer description available for this question.