Chemical Engineering

Question: Minimum porosity for fluidisation is
[A].

that corresponding to static bed.

[B].

that corresponding to completely fluidised bed.

[C].

the porosity of the bed when true fluidisation begins.

[D].

less than that of the’ static bed.

Answer: Option C

Explanation:

No answer description available for this question.

Question: Isothermal turbulent flow of a fluid results in decrease of its pressure, which depends on the
[A].

wall roughness.

[B].

Reynolds number.

[C].

both (a) & (b).

[D].

neither (a) nor (b).

Answer: Option C

Explanation:

No answer description available for this question.

Question: Applicability of Bernoulli’s equation is limited to a/an __________ fluid, that does not exchange shaft work with the surroundings.
[A].

incompressible

[B].

non-viscous

[C].

both (a) and (b)

[D].

neither (a) nor (b)

Answer: Option C

Explanation:

No answer description available for this question.

Question: For one dimensional flow of an incompressible fluid in unsteady state in x-direction, the continuity equation is given by
[A].

[B].

[C].

[D].

Answer: Option A

Explanation:

No answer description available for this question.

Question: An ideal nozzle design aims at
[A].

minimising wall friction.

[B].

suppressing boundary layer separation.

[C].

both (a) & (b).

[D].

neither (a) nor (b).

Answer: Option C

Explanation:

No answer description available for this question.

Question: Momentum transfer in laminar flow of fluids results due to the
[A].

viscosity

[B].

density

[C].

velocity gradient

[D].

none of these

Answer: Option C

Explanation:

No answer description available for this question.

Question: Most of the centrifugal pumps used in chemical plants are usually __________ driven.
[A].

steam

[B].

diesel engine

[C].

electric motor

[D].

gas turbine

Answer: Option C

Explanation:

No answer description available for this question.

Question: With increase in the ratio of orifice diameter to pipe diameter, the fraction of the orifice pressure differential that is permanently lost
[A].

increases

[B].

decreases

[C].

remains unchanged

[D].

increases exponentially

Answer: Option B

Explanation:

No answer description available for this question.

Question: __________ pumps are a group of vacuum pumps.
[A].

Hyter

[B].

Sump

[C].

Mono

[D].

Submerged

Answer: Option A

Explanation:

No answer description available for this question.

Question: Maintenance cost of a __________ pump for a particular duty is the least.
[A].

centrifugal

[B].

reciprocating

[C].

volute

[D].

gear

Answer: Option A

Explanation:

No answer description available for this question.