CHEMICAL ENGINEERING

Question: For laminar flow of a shear thinning liquid in a pipe, if the volumetric flow rate is doubled, the pressure gradient will increase by a factor of
[A].

2

[B].

<2

[C].

>2

[D].

1/2

Answer: Option A

Explanation:

No answer description available for this question.

Question: Applying a pressure drop across a capillary results in a volumetric flow rate ‘Q’ under laminar flow conditions. The flow rate for the same pressure drop, in a capillary of the same length but half the radius is
[A].

Q/2

[B].

Q/4

[C].

Q/8

[D].

Q/16

Answer: Option D

Explanation:

No answer description available for this question.

Question: Boundary layer separation is characterised by one of the conditions given below, where ‘Re’ is the Reynolds number for the flow. Select the appropriate conditions.
[A].

Re << 1, accelerating flow

[B].

Re >> 1, accelerating flow

[C].

Re << 1, decelerating flow

[D].

Re >>1, decelerating flow

Answer: Option D

Explanation:

No answer description available for this question.

Question: A pipe of I.D. 4 m is bifurcated into two pipes of I.D. 2 m each. If the average velocity of water flowing through the main pipe is 5 m/sec, the average velocity through the bifurcated pipes is
[A].

20 m/sec

[B].

10 m/sec

[C].

52 m/sec

[D].

5 m/sec

Answer: Option B

Explanation:

No answer description available for this question.

Question: For an ideal fluid flow, Reynolds number is
[A].

2100

[B].

100

[C].

0

[D].

∞

Answer: Option D

Explanation:

No answer description available for this question.

Question: A Newtonion liquid (ρ = density, μ = viscosity) is flowing with velocity v in a tube of diameter ‘D’. Let Δp be the pressure drop across the length ‘L’. For a laminar flow, Δp is proportional to
[A].

L ρv2/D

[B].

L μ;V/D2

[C].

D ρv2/L

[D].

μ V/L

Answer: Option A

Explanation:

No answer description available for this question.

Question: In the laminar boundary layer flow over a flat plate, the ratio (δ/x) varies as :(where, ‘δ’ is the boundary layer thickness and ‘x’ is the distance from the leading edge in the direction of flow).
[A].

Re

[B].

Re

[C].

1/Re

[D].

Re-1/2

Answer: Option D

Explanation:

No answer description available for this question.

Question: Fluidised beds are formed, when the
[A].

fluid friction is zero

[B].

gravity force is less than the fluid friction.

[C].

pressure forces equal gravity forces.

[D].

sum of the fluid friction and pressure forces is equal and opposite to gravity forces.

Answer: Option B

Explanation:

No answer description available for this question.

Question: A globe valve is the most suitable for applications, in which
[A].

fluid flow control is required.

[B].

fluid contains dispersed solid particles.

[C].

valve is required to be either fully open or fully closed.

[D].

one way flow is required.

Answer: Option A

Explanation:

No answer description available for this question.

Question: Permanent pressure loss in a well designed venturimeter is about __________ percent of the venturi differential.
[A].

1

[B].

10

[C].

30

[D].

50

Answer: Option B

Explanation:

No answer description available for this question.