Q.1

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

  • R(θ + tan θ)
  • R(θ + cot θ)
  • R2(θ + tan θ)
  • R2(θ + cot θ)
  • R(θ + tan θ)
Q.2

Lacy's regime condition is obtained if

  • silt grade in the channel is variable
  • discharge in the channel is variable
  • silt charge in the channel is variable
  • channel flows in unlimited, incoherent alluvium of the same character as that transported material.
Q.3

If average particle size of the silt in millimetres is m, the Lacey's silt factor f is proportional to

  • m
  • m3
  • m1/2
  • m1/3
  • m2/3
Q.4

If the irrigation efficiency is 80%, conveyance losses areand the actual depth of watering iscm, the depth of water required at the canal outlet, is

  • 10 cm
  • 15 cm
  • 20 cm
  • 25 cm
  • 30 cm
Q.5

The most suitable location of a canal head work, is

  • boulders stage of the river
  • delta stage of the river
  • rock stage of the river
  • trough stage of the river.
Q.6

The down stream expansion head of a guide bank is extended to subtend an angle at the centre, equal to

  • 30°
  • 45°
  • 60°
  • 90°
Q.7

A minimum ofcm free board is provided if the discharge in the canal is between

  • 30 to 33 cumecs
  • 30 to 60 cumecs
  • Over 60 cumecs
  • Over 100 cumecs
Q.8

According to Bligh's creep theory, percolating water flows along

  • straight path under the foundation of the dam
  • circular path under the foundation of the dam
  • the outline of the base of the foundation of the dam
  • none of these.
Q.9

A hydraulic jump is generally formed when a stream moving with

  • a hyper-critical velocity meets a stream moving with a critical velocity
  • a hyper-critical velocity meets a stream moving with a hyper-critical velocity
  • A hyper-critical velocity meets a stream moving with a sub-critical velocity
  • a sub-critical velocity meets a stream moving with a hyper-critical velocity.
Q.10

In Montague type fall

  • a straight glacis is provided
  • a circular glacis is provided
  • a parabolic glacis is provided
  • no glacis is provided.
Q.11

In gravity canals, F.S.L. is

  • always at the ground level
  • always below the ground level
  • generally 4 to 5 metres above the ground level
  • only a few cm above the ground level.
Q.12

Lane's weighted creep theory assumes

  • equal weightage to horizontal and vertical creeps
  • double weightage to horizontal creep and one weightage to vertical creep
  • triple weightage to horizontal creep and one weightage to vertical creep
  • triple weightage to vertical creep and one weightage to horizontal creep
  • double weightage to vertical creep and one weightage to horizontal creep.
Q.13

The most suitable location of a canal head work, is

  • boulders stage of the river
  • delta stage of the river
  • rock stage of the river
  • trough stage of the river.
Q.14

For a unique design of a channel by Kennedy's theory

  • its depth must only be known
  • its breadth must only be known
  • its breadth and depth ratio must only be known
  • all the above.
Q.15

If d1 is the depth of cutting, d2 is the height of the bank from bed level r2 : 1 and r1 : 1 are the slopes in filling and cutting respectively, the horizontal distance n between the bed and bank, is

  • x = r1 d1
  • x = r2 d2
  • x = d1 / r1
  • x = d2 / r2
Q.16

Meandering of a river generally occurs, in

  • rocky stage
  • delta stage
  • boulder stage
  • trough stage.
Q.17

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

  • left side
  • right side
  • both sides
  • all the above.
Q.18

The down stream expansion head of a guide bank is extended to subtend an angle at the centre, equal to

  • 30°
  • 45°
  • 60°
  • 90°
Q.19

The structure constructed to allow drainage water to flow under pressure through an inverted syphon below a canal, is called

  • syphon
  • super passage
  • aqueduct
  • super-aqueduct
  • syphon aqueduct.
Q.20

The consumptive use of water for a crop

  • is measured as the volume of water per unit area
  • is measured as depth of water on irrigated area
  • may be supplied partly by precipitation and partly by irrigation
  • all the above.
Q.21

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

  • total pressure on the surface is equal to ω x
  • depth of the point at which total pressure acts is equal to its moment of inertia divided by A x
  • depth of the centre of pressure is 2/3H vertically below the surface
  • all the above.
Q.22

The down stream expansion head of a guide bank is extended to subtend an angle at the centre, equal to

  • 30°
  • 45°
  • 60°
  • 90°
Q.23

Solution of Laplacian equation in three dimensions of water in a syphon, is done by

  • analytical method
  • Khosla's method
  • method of relaxation
  • Unwin's method.
Q.24

The consumptive use of water for a crop

  • is measured as the volume of water per unit area
  • is measured as depth of water on irrigated area
  • may be supplied partly by precipitation and partly by irrigation
  • all the above.
Q.25

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

  • berm
  • free board
  • height of bank
  • none of these.
Q.26

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

  • Head work-distributary-branch canal-minor
  • Head works-main canal-branch canal-dis-tributary-minor
  • Head works-main canal-branch canal-minor-distributary
  • Heads works-branch canal-main canal distributary, minor.
Q.27

F.S.L. of a canal at its head with respect to parent channel is kept

  • at the same level
  • 15 cm lower
  • 15 cm higher
  • none of these.
Q.28

Pick up the correct statement from the following

  • 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
  • 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.
Q.29

A counter berm is

  • 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.
Q.30

According to Lacey, in regime conditions

  • silt is kept in suspension by vertical components of eddies
  • entire cross-section of the channel is generated at all points by the forces normal to the wetted perimeter
  • both (a) and (b)
  • neither (a) nor (b).
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