CHEMICAL ENGINEERING

Question: For a specific centrifugal air blower operating at constant speed & capacity, the power requirement and pressure vary
[A].

directly as square of gas density.

[B].

directly as gas density.

[C].

directly as square root of gas density.

[D].

inversely as gas density.

Answer: Option B

Explanation:

No answer description available for this question.

Question: In case of centrifugal fan or blower, the gas capacity varies as
[A].

speed

[B].

(speed)2

[C].

(speed)3

[D].

(speed)0.5

Answer: Option A

Explanation:

No answer description available for this question.

Question: One dimensional flow implies
[A].

flow in a straight line.

[B].

steady uniform flow.

[C].

unsteady uniform flow.

[D].

a flow which does not account for changes in transverse direction.

Answer: Option D

Explanation:

No answer description available for this question.

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.