Fluid Mechanics

Question: With increase in pump speed, its NPSH requirement
[A].

decreases

[B].

increases

[C].

remains unaltered

[D].

can either increase or decrease ; depends on other factors

Answer: Option B

Explanation:

No answer description available for this question.

Question: Head developed by a centrifugal pump depends on its
[A].

speed

[B].

impeller diameter

[C].

both (a) and (b)

[D].

neither (a) nor (b)

Answer: Option C

Explanation:

No answer description available for this question.

Question: Function of air vessel provided in a reciprocating pump is to
[A].

reduce discharge fluctuation.

[B].

reduce the danger of cavitation.

[C].

avoid the necessity of priming.

[D].

increase the pump efficiency.

Answer: Option A

Explanation:

No answer description available for this question.

Question: A piezometer provided in the pipe measures
[A].

friction factor

[B].

static pressure

[C].

dynamic pressure

[D].

none of these

Answer: Option B

Explanation:

No answer description available for this question.

Question: Co-efficient of velocity is __________ the coefficient of discharge.
[A].

less than

[B].

more than

[C].

equal to

[D].

not related to

Answer: Option B

Explanation:

No answer description available for this question.

Question: A 2″ gate valve fitted in a pipe is replaced by a similar globe valve. Pressure drop in gate valve was Δp. For the same discharge, the pressure drop across globe valve is
[A].

Δp

[B].

< Δp

[C].

> Δp

[D].

Δp2

Answer: Option C

Explanation:

No answer description available for this question.

Question: For water, when the pressure increases, the viscosity
[A].

also increases

[B].

decreases

[C].

remains constant

[D].

first decreases, and then increases

Answer: Option D

Explanation:

No answer description available for this question.

Question: A fluid is the one, which
[A].

cannot remain at rest under the action of shear force.

[B].

continuously expands till it fills any container.

[C].

is incompressible.

[D].

permanently resists distortion.

Answer: Option A

Explanation:

No answer description available for this question.