Irrigation Engineering Set 4 MCQs

Q1 | As compared to crest of the normal portion of the weir, the crest of the under sluice portionof weir is kept at

lower level

higher level

same level

any of the above depending on the design

Q2 | Silt excluders are constructed on the

river bed upstream of head regulator

river bed downstream of head regulator

canal bed upstream of head regulator

canal bed downstream of head regulator

Q3 | According to Khosla's theory, the exit gradient in the absence of a downstream cutoff is

0

unity

infinity

very large

Q4 | The minimum size of stone that will remain at rest in a channel of longitudinal slope S andhydraulic mean depth R is given by

4RS

11 RS

7RS

15 RS

Q5 | The ratio of average values of shear stresses produced on the bed and the banks of a channeldue to flowing water is

less than 1

equal to 1

greater than 1

equal to zero

Q6 | If the critical shear stress of a channel is xc, then the average value of shear stress required to move the grain on the bank is

0.5 xc

0.75 TC

xc

1.33 TC

Q7 | As per Lacey's theory, the silt factor is

directly proportional to average par¬ticle size

inversely proportional to average par¬ticle size

directly proportional to square root of average particle size

not related to average particle size

Q8 | Wetted perimeter of a regime channel for a discharge of 64 cumecs as per Lacey's theory will be

19 m

38m

57m

76m

Q9 | Which of the following canal structures is used to remove surplus water from an irrigationchannel into a natural drain ?

canal fall

canal outlet

canal escape

canal regulator

Q10 | For a proportional outlet, the flexibility is

zero

between zero and 1

1

greater than 1

Q11 | The sensitivity of a rigid module is

zero

between zero and one

1

infinity

Q12 | Which of the following is a flexible outlet ?

submerged pipe outlet

Kennedy's gauge outlet

Gibb's outlet

none of the above

Q13 | A straight glacis type fall with a baffle platform and a baffle wall is called

vertical dropfall

glacis fall

Montague type fall

inglis fall

Q14 | Which of the following types of falls use parabolic glacis for energy dissipation ?

vertical drop fall

glacis fall

Montague type fall

inglis fall

Q15 | In a Sarda type fall, rectangular crest is used for discharge upto

6 cumecs

10 cumecs

14 cumecs

20 cumecs

Q16 | Which of the following can be used as a meter fall ?

vertical drop fall

flumed glacis fall

unflumed glacis fall

all of the above

Q17 | Vertical drop fall is satisfactory for a height upto

0.5 m

1.5 m

3.5 m

5.0 m

Q18 | Which of the following canal outlets maintains a constant discharge ?

non-modular outlet

flexible outlet

rigid module

none of the above

Q19 | The ratio of rate of change of the discharge of an outlet to the rate of change of thedischarge of distributing channel is called

proportionality

flexibility

setting

sensitivity

Q20 | The drainage water intercepting the canal can be disposed of by passing the canal below thedrainage in

aqueduct and syphon aqueduct

aqueduct and super passage

super passage and canal syphon

level crossing

Q21 | If the R.L's of canal bed level and high flood level of drainage are 212.0 m and 210.0 mrespectively, then cross drainage work will be

aqueduct

superpassage

syphon

syphon aqueduct

Q22 | The aqueduct or superpassage type of works are generally used when

high flood drainage discharge is small

high flood drainage discharge is large and short lived

high flood drainage discharge is large and continues for a long time

none of the above

Q23 | An aggrading river is a

silting river

scouring river

both silting and scouring river

neither silting nor scouring river

Q24 | Tortuosity of a meandering river is the ratio of

meander belt to meander length

meander length to meander belt

curved length along the channel to the direct axial length of the river reach

direct axial length of the river reach to curved length along the channel

Q25 | The meander pattern of a river is developed by

average discharge

dominant discharge

maximum discharge

critical discharge