## Irrigation MCQ Practice Questions (Civil Engineering) Set 5

##### Which one of the following statements is correct ?

Options are :

• The canal system and the drainage system are complementary
• The canal system runs on ridges, gets divided into smaller channels and spreads its water on the land
• The drainage system runs along the lowest line, collects drainage water from the slopes and joins the main stream
• All the above

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

Options are :

• Perennial canal
• Inundation canal
• Ridge canal
• Canal

##### Lacey's equation for calculating flood discharge in rivers, is:

Options are :

• V = 10.8 R^(2/3) S^(1/3)
• V = 10.8 R^(1/2) S^(1/2)
• V = 10.8 R^(1/3) S^(2/3)
• V = 10.8 R^(2/3) S^(1/2)

Answer :V = 10.8 R^(2/3) S^(1/3)

##### A current meter measures the velocity of flow, if it is held:

Options are :

• At any point within the cross-section
• On the surface of water
• None of these
• At the bottom of channel

Answer :At any point within the cross-section

##### A river is said to be of:

Options are :

• Meandering type if it flows in sinuous curve
• Aggrading type if it builds up its bed to a certain slope
• Degrading type if it cuts its bed to a certain slope
• All the above

##### Cross regulators in main canals are provided:

Options are :

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

Answer :To increase water head upstream when a main canal is running with low supplies

##### Finally formed berms in canals are provided for:

Options are :

• Protection of banks erosion by the waves
• All the above
• Strengthening of banks
• Control of seepage losses

Options are :

• C
• A
• D
• B

##### Pick up the correct sequence of the part of a canal system from the following:

Options are :

• Heads works-branch canal-main canal distributary, minor

##### According to Lacey, in regime conditions:

Options are :

• Entire cross-section of the channel is generated at all points by the forces normal to the wetted perimeter
• None of these
• Silt is kept in suspension by vertical components of eddies

Answer :Entire cross-section of the channel is generated at all points by the forces normal to the wetted perimeter Silt is kept in suspension by vertical components of eddies

##### For standing crops in undulating sandy fields, the best method of irrigation, is:

Options are :

• Sprinkler irrigation
• Furrow method
• None of these
• Free flooding
• Check method

Options are :

• 1 m/sec
• 0.5 m/sec
• 2 m/sec
• 2.5 m/sec
• 1.5 m/sec

Options are :

• B
• A
• C
• D

##### The ratio of the rate of change of discharge of an outlet and parent channel, is known as:

Options are :

• Sensitivity
• Modular limit
• Flexibility
• Efficiency

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

Options are :

• Escapes are essential safety valves in a canal system
• The capacity of escapes should not be less than the capacity of the canal at its location
• The escapes are aligned to take advantage of contours of lower values
• The escapes must lead the surplus water to natural drainages
• All the above

Options are :

• B
• C
• D
• A

Options are :

• A
• E
• B
• C
• D

##### If A is the area of the surface, x is the depth of its C.G. from the surface of the water and ? is the density of water, then:

Options are :

• Total pressure on the surface is equal to ? x
• 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 A x
• All the above

##### A counter berm is:

Options are :

• A horizontal benching provided on the inside slope
• A horizontal benching provided on the outside slope
• A vertical benching provided on the outer edge of the bank
• A vertical benching provided on the inner edge of the bank

Answer :A horizontal benching provided on the outside slope

##### A fall which maintains its depth, is:

Options are :

• A trapezoidal notch fall
• A rectangular notch fall
• A low weir fall
• All the above

##### The most suitable section of a lined canal, is:

Options are :

• Trapezoidal section with rounded corners for large canals
• Triangular section with circular bottom for small canals
• None of these
• Rectangular section with rounded corners for large canals

Answer :Triangular section with circular bottom for small canals Rectangular section with rounded corners for large canals

##### The water face of the guide banks, is protected by:

Options are :

• One men stone pitching
• Two man stone pitching
• Five man stone pitching
• Three man stone pitching
• Four man stone pitching

Options are :

• C
• E
• A
• B
• D

##### Disposal of extra excavated earth of canals, is utilised to provide a spoil bank on:

Options are :

• All the above
• Left side
• Both sides
• Right side

##### The ratio of the rate of change of discharge of an outlet to the rate of change in level of water surface in a distributary at its normal depth, is known as:

Options are :

• Modular limit
• Flexibility
• Efficiency
• Sensitivity

Options are :

• B
• C
• D
• A

Options are :

• 1.074
• 2.053
• 1.054
• 1.084
• 1.064