Irrigation - Section 1 (3)

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Irrigation - Section 1

Irrigation is a part of this engineering and we provide many MCQs to solve which
are related to this field. You can click on this section to get the questions.

17.

When a canal flowing under pressure is carried below a natural drainage such that its F.S.L. does not touch the underside of the supporting structure, the structure so provided, is called

A.	syphon
B.	aqueduct
C.	super passage
D.	syphon-aqueduct.

Answer: Option C

Explanation:

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18.

Side slopes generally kept for canals in loam soil, are :

A.	1 : 1 in cutting and : 1 in filling
B.	: 1 in cutting and 2 : 1 in filling
C.	Neither (a) nor (b)
D.	Both (a) and (b)

Answer: Option D

Explanation:

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19.

The main function of a diversion head works of a canal from a river, is

A.	to remove silt
B.	to control floods
C.	to store water
D.	to raise water level
E.	all the above.

Answer: Option D

Explanation:

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20.

The top soil of a water logged field becomes more alkaline and infertile if its pH value is

A.	6
B.	8
C.	9
D.	10
E.	11

Answer: Option E

Explanation:

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21.

The sinuosity of a meander is the ratio of

A.	meander length and the width of meander
B.	meander length and half width of the river
C.	curved length and the straight distance
D.	none of these.

Answer: Option C

Explanation:

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22.

For designing the venturi head,

A.	width of the throat should not be less than one-third of the bed width of main canal
B.	width of the throat should not be less than the width obtained from the formula B = Q / 1.2d3/2, where d is the difference in levels of F.S.L. and sill
C.	minimum throat width should not be less than 60 cm
D.	length of the throat should be 2.5 times the depth measured to F.S.L. in the main canal
E.	all the above.

Answer: Option E

Explanation:

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23.

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

A.	Bligh's theory
B.	Electrical analogy method
C.	The relaxation method
D.	Khosla's method of independent variables.

Answer: Option D

Explanation:

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24.

Pick up the correct statement from the following

A.	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
B.	In a level crossing a regulator is provided across the drainage at its down-stream
C.	In a level crossing, a cross regulator is provided on the canal below the crossing
D.	All the above.

Answer: Option D

Explanation:

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Irrigation - Section 1 (3)

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