Irrigation

In a chute spillway, the flow is usually____________________? A. uniform B. subcritical C. criticalD. super critical

Which of the following spillways is least suitable for an earthen dam ? A. ogee spillway B. chute spillway C. side channel spillway D. shaft spillway

Seepage through foundation in an earthen dam is controlled by providing___________________? A. rock toe B. horizontal blanketC. impervious cut off D. chimney drain

The most suitable material for the central impervious core of a zoned embankment type dam is_______________? A. clay B. coarse sand C. silty clayD. clay mixed with fine sand

For wave action in dams, the maximum height of freeboard is generally taken to be equal to_______________? A. 0.5 hw B. 0.75 hw C. 1.25 hwD. 1.50 hw where hw is height of wave

When the reservoir is full, the maximum compressive force in a gravity dam is produced______________? A. at the toe B. at the heel C. within the middle third of base D. at centre of base

Hydrodynamic pressure due to earthquake acts at a height of_________________? A. 3H/47I above the base B. 3H747t below the water surfaceC. 4H/371 above the base D. 4H737t below the water surface where H is the depth of water

The uplift pressure on the face of a drainage gallery in a dam is taken as_________________? A. hydrostatic pressure at toe B. average of hydrostatic pressure at toe and heelC. two-third of hydrostatic pressure at toe plus one-third of hydrostatic pressure at heel D. none of the above

When the upstream face of a gravity dam is vertical, then the intensity of water pressure at the water surface and at the base respectively will be_______________? A. 0 and wH212 B. wH2/2and wH2/3 C. wH and 0D. OandwII where w is unit weight of water and H is the depth of water

Trap efficiency of a reservoir is a function of_______________? A. capacity/inflow ratio B. capacity/outflow ratio C. outflow/inflow ratio D. none of the above