POWER SYSTEMS QUIZ

According to Kennedy, the critical velocity (V₀) in meters in a channel is the mean velocity which keeps the channel free from silting or scouring. Its value is given by (where m is critical velocity ratio and D is the depth of the channel).

V₀ = 0.84 mD0.54

V₀ = 0.55 mD0.64

V₀ = 0.55 mD0.54

V₀ = 0.84 mD0.64

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The top of the capillary zone

Lies below the water table at every point

None of these

Coincides the water table at every point

Lies above the water table at every point

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When the reservoir is full, the maximum compressive force in a gravity dam is produced

at the toe

at centre of base

at the heel

within the middle third of base

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The maximum permissible eccentricity for no tension at the base of a gravity dam is

B/6

B/2

B/3

B/4

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If A is the area of the surface, x̅ is the depth of its C.G. from the surface of the water and ω is the density of water, then

Depth of the centre of pressure is 2/3H vertically below the surface

Depth of the point at which total pressure acts is equal to its moment of inertia divided by Ax̅

Total pressure on the surface is equal to ωx̅

All listed here

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For diversion of flood water of rivers, the type of canal constructed, is

Ridge canal

Inundation canal

Canal

Perennial canal

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Horizontal acceleration due to earthquake results in

hydrodynamic pressure

both (A) and (B)

None of these

inertia force into the body of the dam

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If it rains between 2 P.M. and 3 P.M. and the entire basin area just starts contributing water at 3 P.M. to the outlet, then time of concentration will be

20 minutes

30 minutes

60 minutes

15 minutes

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For supplying water to rabi crop, kharif crop and sugarcane, the channel is designed for a capacity equal to the greater of the water requirement of

rabi or kharif

rabi and kharif or sugarcane

rabi or kharif or sugarcane

rabi and sugarcane or kharif and sugarcane

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The water stored in the reservoir below the minimum pool level is called

surcharge storage

valley storage

useful storage

dead storage

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