GATE CE topic:hydraulics PYQs & Answers — Page 3

Questions 21–30 of 46. Imported answers require independent review unless marked reviewed.

The critical flow condition in a channel is given by ______.

[Note:

– kinetic energy correction factor;

– discharge;

– cross-sectional area of flow at critical flow condition;

– top width of flow at critical flow condition;

– acceleration due to gravity]

Your answerChoose one option.

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A hydraulic jump occurs in a 1.0 m wide horizontal, frictionless, rectangular channel, with a pre-jump depth of 0.2 m and a post-jump depth of 1.0 m. The value of g may be taken as 10 m/s

. The values of the specific force at the pre-jump and post-jump sections are same and are equal to (in m

, rounded off to two decimal places) ____________ .

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Match Column X with Column Y:

Column X	Column Y
(P) Horton equation	(I) Design of alluvial channel
(Q) Penman method	(II) Maximum flood discharge
(R) Chez’s formula	(III) Evapotranspiration
(S) Lacey’s theory	(IV) Infiltration
(T) Dicken’s formula	(V) Flow velocity

Which one of the following combinations is correct?

Your answerChoose one option.

(P)-(IV), (Q)-(III), (R)-(V), (S)-(I), (T)-(II)

(P)-(III), (Q)-(IV), (R)-(V), (S)-(I), (T)-(II)

(P)-(IV), (Q)-(III), (R)-(II), (S)-(I), (T)-(V)

(P)-(II), (Q)-(IV), (R)-(I), (S)-(V), (T)-(II)

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A rectangular channel with Gradually Varied Flow (GVF) has a change bed slope. If the change is from a steeper slope to a steep slope, the resulting GVF profile is

Your answerChoose one option.

S₃

S₁

S₂

either S₁ or S₂, depending on the magnitude of the slopes

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Water is flowing in a horizontal, frictionless, rectangular channel. A smooth hump is built on the channel floor at a section and its height is gradually increased to reach choked condition in the channel. The depth of water at this section is

and that at its upstream section is

. The correct statement(s) for the choked and unchoked conditions in the channel is/are

Your answerSelect all correct options. You can choose more than one.

In choked condition,

decreases if the flow is supercritical and increases if the flow is subcritical.

In choked condition,

is equal to the critical depth if the flow is supercritical or subcritical.

In unchoked condition,

remains unaffected when the flow is supercritical or subcritical.

In choked condition,

increases if the flow is supercritical and decreases if the flow is subcritical.

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A hydraulic jump takes place in a 6 m wide rectangular channel at a point where the upstream depth is 0.5 m (just before the jump). If the discharge in the channel is 30 m

/s and the energy loss in the jump is 1.6 m, then the Froude number computed at the end of the jump is __________. (round off to two decimal places)

(Consider the acceleration due to gravity as 10 m/s

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Depth of water flowing in a 3 m wide rectangular channel is 2 m. The channel carries a discharge of 12 m³/s. Take

m/s².

The bed width (in m) at contraction, which just causes the critical flow, is ________ without changing the upstream water level. (round off to two decimal places)

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If water is flowing at the same depth in most hydraulically efficient triangle and rectangular channel sections then the ratio of hydraulic radius of triangle section to that of rectangular section is

Your answerChoose one option.

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A rectangular open channel of 6 m width is carrying a discharge of 20 m

/s. Consider the acceleration due to gravity as 9.81 m/s

and assume water as incompressible and inviscid. The depth of flow in the channel at which the specific energy of the flowing water is minimum for the given discharge will then be

Your answerChoose one option.

0.82 m

1.04 m

2.56 m

3.18 m

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An unlined canal under regime conditions along with a silt factor of 1 has a width of flow 71.25 m. Assuming the unlined canal as a wide channel, the corresponding average depth of flow (in m, round off to two decimal places) in the canal will be

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GATE CE topic:hydraulics PYQs

Question 44

Question 60

Question 19

Question 21

Question 47

Question 56

Question 58

Question 9

Question 31

Question 48