## Irrigation MCQ Practice Questions (Civil Engineering) Set 4

Options are :

• A
• C
• D
• B

##### When a canal is carried over a natural drainage, the structure provided, is known as:

Options are :

• Syphon-aqueduct
• Syphon
• Super passage
• Aqueduct

##### In a canal syphon, the flow is:

Options are :

• With critical velocity
• Under negative pressure
• Pipe flow
• Under atmospheric pressure

##### Borrow pits should preferably be located in:

Options are :

• Central half width of the section of the canal
• Field on the right side of the canal
• Fields on both sides of the canal
• Field on the left side of the canal

Answer :Central half width of the section of the canal

##### For the design of major hydraulic structures on the canals, the method generally preferred to, is based on:

Options are :

• Khosla's method of independent variables
• Electrical analogy method
• Bligh's theory
• The relaxation method

Answer :Khosla's method of independent variables

Options are :

• 60 cm
• 80 cm
• 70 cm
• 50 cm
• 90 cm

##### When a canal and a drainage approach each other at the same level, the structure so provided, is:

Options are :

• An aqueduct
• A level crossing
• Inlet and outlet
• A syphon

##### The crest level of a canal diversion head work, depends upon:

Options are :

• F.S.L. of the canal
• All the above
• Discharge perimeters
• Pond level
• None these

##### In a syphon aqueduct:

Options are :

• Drainage passes over the canal and F.S.L. of the canal is above the bottom of the drainage trough
• Canal passes over the drainage and H.F.L. of the drainage is below the bottom of the canal trough
• Canal passes over the drainage and H.F.L. of the drainage is above the bottom of the canal trough
• Drainage passes over the canal and F.S.L. of the canal is below the bottom of the drainage trough

Answer :Canal passes over the drainage and H.F.L. of the drainage is above the bottom of the canal trough

##### A land is said to be water-logged if its soil pores within:

Options are :

• All the above
• A depth of 50 cm are saturated
• Root zone of the crops are saturated
• A depth of 40 cm are saturated

Answer :Root zone of the crops are saturated

Options are :

• A
• C
• B
• D

Options are :

• 10 cm
• 30 cm
• 40 cm
• 20 cm

##### If water table is comparatively high, the irrigation canal becomes useless, due to:

Options are :

• Water logging of the cultivated areas
• Uncertain water demand
• All the above
• Large amount of seepage

Options are :

• 1.75 D
• 1.50 D
• 2.00 D
• 1.25 D

##### An outlet is said to be proportional if its flexibility, is:

Options are :

• Less than one
• One
• Zero
• More than one

##### The field capacity of a soil depends upon:

Options are :

• Porosity of soil
• Capillary tension in soil
• None of these

Answer :Porosity of soil Capillary tension in soil

##### Garnett's diagrams are used for graphical solution of design equations of a canal by:

Options are :

• Kennedy's theory
• Lacey's theory
• Lindlay theory
• Gibb's theory

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

Options are :

• All the above
• Saturated pores of a soil in the capillary zone above water table have negative pressure
• At water table, hydrostatic pressure is zero
• Water table generally follows the ground surface above it with a few exceptions
• Static level of water in an open well indicates the position of the water table

##### For cereal crops the most commonly adopted method of irrigation, is:

Options are :

• Sprinkling method
• Furrow method
• Free flowing method
• Check method

##### The ratio of the head recovered to the head put in, is known as:

Options are :

• Efficiency
• Sensitivity
• Flexibility
• Modular limit

##### The level of the fioor of a syphon aqueduct can be obtained:

Options are :

• None of these
• Both A and B
• By subtracting the depth of the culvert from the canal bed level
• By subtracting the thickness of culvert plus the depth of the culvert from the canal bed level

Answer :By subtracting the thickness of culvert plus the depth of the culvert from the canal bed level

Options are :

• D/4
• D/3
• D/2
• D
• D/5

##### In rigid module, the discharge:

Options are :

• Depends upon the water levels of both, i.e. distributary and water course
• Depends upon the water level in the water course
• Depends upon the water level in distributary
• None of these
• Is independent of water levels in the distributary and water course

Answer :Is independent of water levels in the distributary and water course

##### While deciding the alignment of a proposed canal taking off from a river at B, three alignments of approximately equal lengths are availableThese cross a drainages at C1, C2 and C3 where drainage bed levels C1 > C2 > C3, you will provide at site C3

Options are :

• A super passage
• An aqueduct
• A syphon aqueduct
• A syphon

##### The uplift pressure on the roof of an inverted syphon, is maximum when:

Options are :

• Drain in running dry
• Drain is running with H.F.L.
• Canal is running dry
• Canal is running with F.S.L.

Answer :Drain is running with H.F.L.

##### Lane's weighted creep theory assumes:

Options are :

• Triple weightage to horizontal creep and one weightage to vertical creep
• Equal weightage to horizontal and vertical creeps
• Double weightage to vertical creep and one weightage to horizontal creep
• Double weightage to horizontal creep and one weightage to vertical creep
• Triple weightage to vertical creep and one weightage to horizontal creep

Answer :Triple weightage to vertical creep and one weightage to horizontal creep

##### Process of meandering is due to:

Options are :

• All the above
• Discharge and hydraulic properties of streams
• Relative erodibility of the bed and banks

##### Effective precipitation for a crop may be defined as:

Options are :

• Total precipitation during the crop period
• Total precipitation minus the loss due to evaporation
• Total precipitation minus the loss due to infiltration
• Available water stored in soil within root zone of the crop

Answer :Available water stored in soil within root zone of the crop

Options are :

• m^(1/3)
• m
• m^(2/3)
• m^(3)
• m^(1/2)

##### To hold hydraulic jumps, baffle walls are provided in:

Options are :

• Sarda type falls
• Vertical type falls
• Montague type falls
• English type falls