Fluid Mechanics

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.

Question: Navier-Stokes equation is useful in the analysis of __________ fluid flow problems.
[A].

non-viscous

[B].

viscous

[C].

turbulent

[D].

rotational

Answer: Option B

Explanation:

No answer description available for this question.

Question: Gradually varying fluid flow is an example of __________ flow.
[A].

non-steady uniform

[B].

non-steady non-uniform

[C].

steady uniform

[D].

steady non-uniform

Answer: Option A

Explanation:

No answer description available for this question.

Question: A weir is used to measure the large water discharge rate from a river or from an open channel. A weir is not of __________ shape.
[A].

circular

[B].

rectangular

[C].

triangular

[D].

trapezoidal

Answer: Option A

Explanation:

No answer description available for this question.