   ## Irrigation MCQ Practice Questions (Civil Engineering) Set 2

##### Solution of Laplacian equation in three dimensions Larger image of water in a syphon, is done by:

Options are :

• Analytical method
• Unwin's method
• Khosla's method
• Method of relaxation

Options are :

• 2000
• 1400
• 1000
• 1600
• 1200

##### A minimum of 90 cm free board is provided if the discharge in the canal is between:

Options are :

• Over 60 cumecs
• 30 to 33 cumecs
• Over 100 cumecs
• 30 to 60 cumecs

##### A fall in a canal bed is generally provided, if:

Options are :

• None of these
• Ground slope is practically the same as the designed bed slope
• Ground slope exceeds the designed bed slope
• Designed bed slope exceeds the ground slope

Answer :Ground slope exceeds the designed bed slope

##### In gravity canals, F.S.L. is:

Options are :

• Only a few cm above the ground level
• Always below the ground level
• Always at the ground level
• Generally 4 to 5 metres above the ground level

Answer :Only a few cm above the ground level

##### A hydraulic structure is designed to withstand:

Options are :

• All the above
• Hydraulic jump
• Seepage forces
• Hydraulic pressure

##### The consumptive use of water for a crop:

Options are :

• Is measured as the volume of water per unit area
• May be supplied partly by precipitation and partly by irrigation
• Is measured as depth of water on irrigated area
• All the above.

##### The main cause of silting up a channel:

Options are :

• Non-regime section
• Defective outlets
• All the above

##### Bed bars in a canal are provided:

Options are :

• To control the silting
• All the above
• To watch the general behaviour of canal
• To raise the supply level
• To measure the discharge

Answer :To watch the general behaviour of canal

##### In a barrage, the crest level is kept:

Options are :

• High with large gates
• High with no gates
• Low with no gates
• Low with large gates

##### If straight sides of a triangular section of a lined canal with circular bottom of radius R, make an angle ? with horizontal, the area of its cross-section, is:

Options are :

• R(? + cot ?)
• R^(2)(? + cot ?)
• R(? + tan ?)
• R^(2)(? + tan ?)
• R(? + tan ?)

Options are :

• A
• D
• E
• B
• C

##### Meandering of a river generally occurs, in:

Options are :

• Boulder stage
• Rocky stage
• Delta stage
• Trough stage

Options are :

• x = d1 / r1
• x = r2 d2
• x = r1 d1
• x = d2 / r2

##### An outlet which maintains a constant discharge irrespective of fluctuation in the water levels of the supplying channel or water course, is known as:

Options are :

• Non-modular outlet
• Semi-modular outlet
• Flexible modular outlet
• Right modular outlet

##### The most suitable location of a canal head work, is:

Options are :

• Trough stage of the river
• Boulders stage of the river
• Rock stage of the river
• Delta stage of the river

Answer :Trough stage of the river

##### Lacy's regime condition is obtained if:

Options are :

• Channel flows in unlimited, incoherent alluvium of the same character as that transported material
• Silt grade in the channel is variable
• Silt charge in the channel is variable
• Discharge in the channel is variable

Answer :Channel flows in unlimited, incoherent alluvium of the same character as that transported material

##### For a standing crop, the consumptive use of water is equal to the depth of water:

Options are :

• Evaporated by the crop
• Transpired by the crop
• Used by the crop in transpiration, evaporation and also the quantity of water evaporated from adjacent soil
• Transpired and evaporated by the crop

Answer :Used by the crop in transpiration, evaporation and also the quantity of water evaporated from adjacent soil

##### Bligh's theory of seepage assumes:

Options are :

• Equal weightage to the horizontal and vertical creep
• Less weightage to horizontal creep than vertical creep
• More weightage to horizontal creep than vertical creep
• Loss of head follows the sine curve

Answer :Equal weightage to the horizontal and vertical creep

Options are :

• B
• Both A and B
• C
• A

##### Pick up the incorrect statement from the following:

Options are :

• Once the width of the flume becomes 2/3rd of the width of the distributary, the splayed walls are increased to 1 in 3 to get full bed width
• Side walls of a venturi head flume are splayed out from the end of the throat at 1 : 10 for a length of 4.5 m
• None of these
• Length of side walls should be such that the width of the flume is made equal to 2/3rd the bed width of the distributary

Options are :

• 2 : 1
• 6 : 1
• 4 : 1
• 3 : 1
• 5 : 1

##### Pick up the correct statement from the following:

Options are :

• If the setting of an outlet is higher than that required for proportionality, the outlet is hyper-proportional
• If the setting of an outlet is lower than that required for proportionality, the outlet is sub-proportional
• If the flexibility is zero, it is a rigid module
• If the flexibility is more than one, the outlet is hyper-proportional
• All the above

Options are :

• 1.00
• 0.25
• 0.50
• Zero
• 0.75

##### The difference in level between the top of a bank and supply level in a canal, is called:

Options are :

• None of these
• Berm
• Height of bank
• Free board

##### Pick up the correct statement from the following:

Options are :

• In a level crossing a regulator is provided across the drainage at its down-stream
• In a level crossing, a cross regulator is provided on the canal below the crossing
• All the above
• In a level crossing, a crest with its top at the canal F.S.L. is provided across the drainage at its up-stream junction with canal

##### If the straight sides of a triangular section of a lined canal with circular bottom of radius R, make an angle ? with horizontal, the perimeter of the canal is:

Options are :

• R(? + tan ?)
• None of these
• 2R(? + cos ?)
• 2R(? + tan ?)
• R(? + cos ?)

##### For the conditions enumerated to provide a crossing at C1 You will probably provide:

Options are :

• A syphon aqueduct
• A super-passage
• None of these
• An aqueduct

##### According to G.W. Pickles the effect of confining the flood water of a river between levee, is to increase:

Options are :

• Rate of flood wave
• Water surface elevation during floods
• Maximum discharge
• Surface slope of streams above the leveed portion
• Velocity and scouring action

Answer :Surface slope of streams above the leveed portion

##### The discharge over a trapezoidal crest of a Sarda fall with free over fall conditions, is:

Options are :

• 0.45 ?2g . LH^(3/2) (H/B)^(1/3)
• 0.45 ?2g . LH^(3/2) (H/B)^(1/6)
• 0.45 ?2g . LH^(2/3) (H/B)^(2/3)
• 0.45 ?2g . LH^(1/6) (H/B)^(3/2)

Answer :0.45 ?2g . LH^(3/2) (H/B)^(1/6)

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