Irrigation Engineering (3170609) MCQs

MCQs of DISTRIBUTION WORKS

Showing 41 to 50 out of 73 Questions
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41.

Which of the following statement is incorrect?

(a)

The seepage loss is very high in black cotton soils and heavy clay as compared to sandy porous soil
(b)

The seepage through a new canal is more than from a silted canal
(c)

The more the silt, the lesser are the losses
(d)

The more the velocity, the lesser will be the losses
Answer:

Option (a)

42.

Which soil has the least range of conveyance loss according to Etcheverry and Harding?

(a)

Sandy Loam
(b)

 Clay Loam
(c)

Loose sandy soil
(d)

Impervious clay loam
Answer:

Option (d)

43.

What is the most important point to be considered while fixing the canal capacity?

(a)

Keenest Demand
(b)

 Average Demand
(c)

Water Demand
(d)

Demand
Answer:

Option (a)

44.

 Let us consider in a given area the plantation of a certain crop takes 20 days, and the total water depth required by this crop is 80 cm on the field. Find the duty of irrigation water required for the crop during this period. (a) Assuming 20% losses of water in the water courses, find duty at the head of the course. (b) Find the duty of the water at the head of the distributary, assuming 10% losses from the distributary head.

(a)

182.9 hectares/cumec, 194.4 hectares/cumec
(b)

 172.8 hectares/cumec, 185.4 hectares/cumec
(c)

172.8 hectares/cumec, 194.4 hectares/cumec
(d)

185.6 hectares/cumec, 184.6 hectares/cumec
Answer:

Option (c)

45.

What is the safe limiting velocity for cement concrete lining?

(a)

1.5 m/s
(b)

 2.2 m/s
(c)

2.7 m/s
(d)

1.8 m/s
Answer:

Option (c)

46.

The most economical type of lining is the one which shows ____________

(a)

minimum benefit-cost ratio
(b)

 maximum benefit-cost ratio
(c)

 zero benefit-cost ratio
(d)

benefit-cost ratio = 1
Answer:

Option (b)

47.

Which of the following guideline is not recommended for the choice of lining when the bed width of the canal is up to 3 m?

(a)

 Single burnt clay tile lining or brick lining
(b)

PCC slab lining
(c)

Flexible membrane lining with adequate earth/tile cover
(d)

In-situ cement concrete lining in bed as well as on sides
Answer:

Option (d)

48.

 Which of the following is not a cause for the hydrostatic pressure on the lining?

(a)

Seeping of the rainwater in the backfill
(b)

When the water table remains below the canal bed
(c)

The backfill is of low drainage
(d)

The backfill is of high permeability (i.e. > 3 cm/sec)
Answer:

Option (d)

49.

 Pressure relief valves may help in ___________

(a)

 releasing the hydrostatic pressure
(b)

holding the hydrostatic pressure
(c)

 increasing the hydrostatic pressure
(d)

may increase or decrease the hydrostatic pressure
Answer:

Option (a)

50.

 Pipe drains run _______________

(a)

longitudinally on the bed and transverse to the length of canal on the side slopes
(b)

longitudinally to the length of the canal on the side slopes and transverse to the bed
(c)

longitudinally to the length of the canal
(d)

transverse to the bed
Answer:

Option (a)

Showing 41 to 50 out of 73 Questions
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