Fluid Mechanics

Question: In fluid flow, cavitation is caused, if the
[A].

fluid velocity decreases to zero.

[B].

total energy decreases.

[C].

both (a) and (b).

[D].

flow pressure approaches its vapor pressure at the prevailing temperature.

Answer: Option D

Explanation:

No answer description available for this question.

Question: With increase in the ratio of orifice diameter to pipe diameter in case of an orificemeter, the overall pressure loss
[A].

decreases

[B].

increases

[C].

remains constant

[D].

increases linearly

Answer: Option C

Explanation:

No answer description available for this question.

Question: Fluid resistance to shear depends upon its
[A].

rate of transfer of molecular momentum.

[B].

cohesion.

[C].

both (a) and (b).

[D].

neither (a) nor (b).

Answer: Option C

Explanation:

No answer description available for this question.

Question: Drag co-officient CD, in Stoke’s law range is given by
[A].

[B].

[C].

[D].

Answer: Option B

Explanation:

No answer description available for this question.

Question: In magnetic flow meters, voltage generation is
[A].

due to the motion of conducting fluid through an externally generated uniform field.

[B].

proportional to the fluid velocity.

[C].

both (a) and (b).

[D].

neither (a) nor (b).

Answer: Option C

Explanation:

No answer description available for this question.

Question: Boundary layer thickness in turbulent flow over a flat plate increases as(where, d = distance from the leading edge.)
[A].

d

[B].

d2/3

[C].

d4/5

[D].

d1/3

Answer: Option C

Explanation:

No answer description available for this question.

Question: Consider a centrifugal pump having a specific impeller diameter, fixed impeller speed pumping a liquid of constant density at a particular discharge capacity. With decrease in the capacity of the pump, the __________ decreases.
[A].

NPSH required.

[B].

BHP required by the pump.

[C].

head of the liquid pumped.

[D].

all (a), (b) and (c).

Answer: Option D

Explanation:

No answer description available for this question.

Question: Buckingham-π theorem states that in any physical problem including ‘n’ quantities having ‘m’ diamensions, the quantities can be arranged into __________ independent dimensionless parameters.
[A].

m

[B].

n

[C].

n-m

[D].

n/m

Answer: Option C

Explanation:

No answer description available for this question.

Question: All pipes of a particular nominal size have the same
[A].

inside diameter

[B].

outside diameter

[C].

thickness

[D].

none of these

Answer: Option B

Explanation:

No answer description available for this question.

Question: For turbulent flow in smooth circular pipe, the velocity distribution is a function of the distance ‘d’ measured from the wall of the pipe and the friction velocity ‘v’, and it follows a __________ relationship.
[A].

logarithmic

[B].

linear

[C].

hyperbolic

[D].

parabolic

Answer: Option A

Explanation:

No answer description available for this question.