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Irrigation Engineering

Irrigation Engineering
The net speed under which the turbine reaches its peak efficiency is called

operating speed
gross speed
rated speed
design speed

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Irrigation Engineering
Coefficient of discharge of an ogee spillway

depends on downstream apron interference and downstream submergence
both (A) and (B)
remains constant
depends on depth of approach and upstream slope

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Irrigation Engineering
If D₁ and D₂ are depths of water upstream and downstream of a hydraulic jump, the loss of head at the jump, is

(D₂ - D₁)3/3D₁D₂
(D₂ - D₁)3/4D₁D₂
(D₂ - D₁)3/D₁D₂
(D₂ - D₁)3/2D₁D₂

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Irrigation Engineering
Cross regulators in main canals are provided

To increase water head upstream when a main canal is running with low supplies
To regulate water supply in the distributaries
None of these
To overflow excessive flow water

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Irrigation Engineering
If H and d are the water depth and drop in the bed level at a Sarda fall, the width B of the trapezoidal crest, is given by

B = 0.22 √(H + d)
B = 0.44 √(H + d)
B = 0.33 √(H + d)
B = 0.55 √(H + d)

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Irrigation Engineering
Presence of tail water in a gravity dam
i) increases the principal stress
ii) decreases the principal stress
iii) increases the shear stress
iv) decreases the shear stress
The correct answer is

(ii) and (iii)
(i)and(iv)
(ii) and (iv)
(i) and (iii)

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