Irrigation Engineering Set 14 MCQs

Q1 | Tortuosity of a meandering river is the ratio of

meander length to width of meander

meander length to width of river

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

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

Q2 | For irrigation purposes, the p-H value of water should be

between 3 and 6

between 6 and 8.5

between 8.5 and 11

more than 11

Q3 | The precipitation caused by lifting of warm moisture laden air masses due to topographic barriers, is called

convective precipitation

orographic precipitation

cyclonic precipitation

none of these

Q4 | Which of the following is a type of non-modular outlet?

Submerged pipe outlet

Open-flume outlet

Kennedy's gauge outlet

all of these

Q5 | Flood frequency denotes the likelyhood of flood being equalled or exceeded.

Yes

No

Q6 | A degrading river is a scouring river.

Yes

No

Q7 | The water content at which plants can no-longer extract sufficient water from the soil for its growth, is called

field capacity

saturation capacity

permanent wilting point

available moisture

Q8 | Lacey gave a relation between

velocity and hydraulic mean depth

area and velocity

both (a) and (b)

none of these

Q9 | According to Khosla's theory, the critical hydraulic gradient for alluvial soils is approximately equal to

1

1.5

2

2.5

Q10 | When the bed level of the canal is higher than the highest flood level (H.F.L.) of the drainage, then the cross drainage work is said to be

aqueduct

super-passage

canal syphon

syphon aqueduct

Q11 | The floor of the aqueduct is subjected to uplift pressure due to

seepage of water from the canal to the drainage

sub-soil water table in the drainage bed

both (a) and (b)

none of the above

Q12 | When the levels are such that the F.S.L. of the canal is much above the bed level of the drainage trough, so that the canal runs under syphonic action under the trough, the structure provided is known as

syphon aqueduct

level crossing

canal syphon

super syphon

Q13 | A fall, which maintains the depth is a

trapezoidal notch fall

rectangular notch fall

low weir fall

all of these

Q14 | The soil becomes, practically, infertile if its p-H value is

0

7

11

14

Q15 | For the pipe outlet to be proportional, the outlet is set at

0.3 times

0.5 times

0.8 times

Q16 | In a lined canal, the resistance to flow decreases and velocity of flow increases.

Agree

Disagree

Q17 | According to Lacey, a channel is said to be in regime, if

it flows in incoherent unlimited alluvium of the same character as that transported material

its discharge is constant

the silt grade and the silt charge are constant

all of the above

Q18 | Which of the following satement is correct?

In Lacey's silt theory, the derivation of the various formulae depends upon a single factor 'f'.

Lacey's equation includes a concentration of silt as variable.

Lacey properly define the silt grade and silt charge.

Lacey introduced semi-ellipse as ideal shape of a regime channel.

Q19 | Okhla weir on Yamuna river, in Delhi, is an example of

vertical drop weir

drystone slope weir

concrete slope weir

parabolic weir

Q20 | Kennedy gave a relation between

velocity and hydraulic mean depth

area and velocity

critical velocity and the depth of flowing water

all of the above

Q21 | Check flooding method of irrigation is used for

closed growing crops

tracts with flat gradients

crops which can stand inundation of water for sometime

crops such as sugarcane, potatoes etc.

Q22 | Lacey assumed that silt is kept in suspension because of the normal components of eddies generated from the

bed only

side only

whole perimeter

none of these

Q23 | In Bligh's creep theory

there is no distinction between horizontal and vertical creep

loss of head does not take place in the same proportion as creep length

the uplife pressure distribution is not linear, but follows a sine curve

all of the above

Q24 | Dicken's formula for high flood discharge is useful for catchments in

Southern India

Northern India

Eastern India

Western India

Q25 | Intensity of irrigation should be increased in order to prevent the area from water logging.

Yes

No