Hydraulics and Fluid Mechanics

Question: A channel is said to be of most economical cross-section, if
[A].

it gives maximum discharge for a given cross-sectional area and bed slope

[B].

it has minimum wetted perimeter

[C].

it involves lesser excavation for the designed amount of discharge

[D].

all of the above

Answer: Option D

Explanation:

No answer description available for this question.

Question: According to Manning’s formula, the discharge through an open channel is (where M = Manning’s constant)
[A].

A x M x m1/2 x i2/3

[B].

A x M x m2/3 x i1/2

[C].

A1/2 x M2/3 x m x i

[D].

A2/3 x M1/3 x m x i

Answer: Option B

Explanation:

No answer description available for this question.

Question: According to Chezy’s formula, the discharge through an open channel is (where A = Area of flow, C = Chezy’s constant, m = Hydraulic mean depth, and i = Uniform slope in bed)
[A].

A m x i

[B].

C m x i

[C].

AC m x i

[D].

mi A x C

Answer: Option C

Explanation:

No answer description available for this question.

Question: A nozzle placed at the end of a water pipe line discharges water at a
[A].

low pressure

[B].

high pressure

[C].

low velocity

[D].

high velocity

Answer: Option D

Explanation:

No answer description available for this question.

Question: A nozzle is generally made of
[A].

cylindrical shape

[B].

convergent shape

[C].

divergent shape

[D].

convergent-divergent shape

Answer: Option B

Explanation:

No answer description available for this question.

Question: An air vessel is provided at the summit in a syphon to
[A].

avoid interruption in the flow

[B].

increase discharge

[C].

increase velocity

[D].

maintain pressure difference

Answer: Option A

Explanation:

No answer description available for this question.

Question: A siphon is used to connect two reservoirs at different levels intervened by a high ridge.
[A].

True

[B].

False

Answer: Option A

Explanation:

No answer description available for this question.

Question: In case of flow through parallel pipes,
[A].

the head loss for all the pipes is same

[B].

the total discharge is equal to the sum of discharges in the various pipes

[C].

the total head loss is the sum of head losses in the various pipes

[D].

Both (A) and (B)

Answer: Option D

Explanation:

No answer description available for this question.

Question: A compound pipe of diameter d1, d2 and d3 having lengths l1, l2 and l3 is to be replaced by an equivalent pipe of uniform diameter d and of the same length (l) as that of the compound pipe. The size of the equivalent pipe is given by
[A].

[B].

[C].

[D].

Answer: Option D

Explanation:

No answer description available for this question.

Question: A compound pipe is required to be replaced by a new pipe. The two pipes are said to be equivalent, if
[A].

length of both the pipes is same

[B].

diameter of both the pipes is same

[C].

loss of head and discharge of both the pipes is same

[D].

loss of head and velocity of flow in both the pipes is same

Answer: Option C

Explanation:

No answer description available for this question.