Test 31 - Canal Classification and Alignment

Question 1 ప్రశ్న 1

Which statement correctly describes common ways of classifying irrigation canals?

A Canals can be classified only by lining material B Canals are classified only by whether they cross a river C Canals may be classified by source of supply, function or relative importance in the canal network, alignment, and other engineering characteristics D Every irrigation canal belongs only to the categories ridge canal and contour canal

Question 2 ప్రశ్న 2

What is the usual primary function of a main canal in a large gravity-irrigation network?

A To deliver water directly to each individual farm plot along its entire length B To carry a major share of the project supply from the headworks and feed branch canals or major distributaries C To collect agricultural drainage and return it to the river D To act only as a flood-protection embankment

Question 3 ప్రశ్న 3

Which description best represents a branch canal in a conventional irrigation network?

A The smallest channel conveying water from an outlet to individual fields B A natural drainage channel intersecting the irrigation system C A channel that can take off only from a minor distributary D A sizeable canal taking off from the main canal and supplying lower-order distributaries or parts of the command

Question 4 ప్రశ్న 4

What is the principal irrigation-network role of a distributary?

A To distribute water from a main or branch canal toward outlets, minors, and ultimately the agricultural fields B To carry the entire river flood around the headworks C To function only as a drainage channel below the command area D To replace the main canal in every large irrigation project

Question 5 ప్రశ్న 5

Which channel normally forms the final small open-channel link carrying irrigation water from an outlet or minor toward individual fields?

A Main canal B Branch canal C Watercourse or field channel D River diversion weir

Question 6 ప్రశ్న 6

What is the defining alignment characteristic of a ridge or watershed canal?

A It is aligned along the deepest natural drainage line B It follows or remains near a watershed or ridge separating drainage basins C It is aligned exactly parallel to every contour D It must be located at the lowest elevation in the command

Question 7 ప్రశ్న 7

Why can a ridge canal have an important advantage with respect to cross-drainage works?

A Natural drainage lines generally flow away from the watershed, so a canal following the ridge tends to intersect fewer major drains B A ridge canal is always located below every stream bed C Ridge canals are designed to carry all natural drainage inside the canal itself D The ridge alignment eliminates the need for bridges, regulators, or any other structures

Question 8 ప్రశ్న 8

Which description best characterizes a contour canal?

A A canal following the watershed and commanding both sides equally B A canal lying along the natural valley drainage line C A canal intentionally aligned in the direction of maximum ground slope D A canal aligned approximately parallel to the ground contours while maintaining the required hydraulic bed slope

Question 9 ప్రశ్న 9

A contour canal running along a hillside will generally command irrigation land primarily on which side?

A Only the higher hillside above the canal B Both sides equally under all circumstances C The lower side of the canal because gravity delivery is naturally favored toward lower ground D Neither side because contour canals are used only for navigation

Question 10 ప్రశ్న 10

Why does a contour canal commonly require more cross-drainage works than a well-sited ridge canal?

A Because contour canals always run inside river channels B Because natural drainage generally descends across contours, causing a contour-aligned canal to intersect streams and drainage depressions C Because every contour canal must cross the main river once per kilometre D Because the canal water itself creates new rivers on the upstream side

Question 11 ప్రశ్న 11

What is the characteristic alignment of a side-slope canal in the traditional irrigation-engineering classification?

A It runs roughly across the contours in the general direction of the ground fall and is neither a watershed canal nor a contour canal B It follows one contour exactly with zero bed slope C It is always located on the main watershed D It must follow the deepest river channel

Question 12 ప్రశ్న 12

What is a likely engineering consequence when a side-slope canal follows terrain whose natural fall is much steeper than the permissible canal bed slope?

A The canal automatically becomes a ridge canal B The canal requires no level control because ground and water surfaces must coincide C The discharge becomes zero D Falls, drops, route adjustments, or substantial cut-and-fill treatment may be required to reconcile the canal grade with the steep ground

Question 13 ప్రశ్న 13

Which group of factors is most appropriate when selecting the alignment of a major irrigation canal?

A Only the shortest straight-line distance between headworks and tail B Only the value of agricultural land acquired C Topography, required command, permissible canal grade, soil and geology, natural drainage crossings, earthwork, structures, settlements, existing infrastructure, and overall economy D Only the number of bends in the canal

Question 14 ప్రశ్న 14

Why is a canal alignment involving moderate partial cutting and filling often economically attractive compared with long reaches of very deep cutting or very high embankment?

A It can help balance excavated material with embankment needs and reduce excessive earthwork, haulage, and structural risk B It guarantees zero seepage from an unlined canal C It makes canal bed slope unnecessary D It ensures that no land acquisition will be required

Question 15 ప్రశ్న 15

Which problem is particularly associated with an unnecessarily deep canal cutting?

A The canal necessarily commands a larger area on both sides B The need for embankment compaction disappears completely C Excavation quantity, cut-slope stability, groundwater drainage, disposal, and construction cost may become excessive D Cross-drainage works can no longer be required

Question 16 ప్రశ్న 16

Why should very high canal embankments be avoided where a more balanced alignment is reasonably available?

A Because water cannot flow in a canal constructed above natural ground B Because canal embankments are prohibited in irrigation projects C Because all embankment material is hydraulically impermeable D Because high fills increase earthwork, borrow, settlement, seepage, slope-stability, breach-consequence, and maintenance concerns

Question 17 ప్రశ్న 17

When a canal alignment intersects a natural drainage channel, what is the basic purpose of a cross-drainage work?

A To permanently divert the entire irrigation supply into the drain B To stop all natural runoff upstream of the canal C To permit the canal and natural drainage to cross safely while maintaining their required hydraulic functions D To convert every drainage channel into a distributary

Question 18 ప్రశ్న 18

Two technically feasible alignments are being compared. Alignment R follows a ridge and can command land on both sides with few drainage crossings; Alignment C follows a hillside contour and commands mainly the lower side but reaches a specific valley command more directly. Which conclusion is most appropriate?

A Alignment R must always be selected because ridge canals are universally cheapest B The choice should compare command benefits, canal length, grade, earthwork, drainage structures, geology, land constraints, and total economy rather than selecting by canal type alone C Alignment C must always be rejected because contour canals cannot irrigate land D Both alignments are hydraulically identical because topography has no influence on canals

Question 19 ప్రశ్న 19

In irrigation planning, what is meant generally by the command area of a canal system?

A The geographical area that can potentially receive irrigation supply from the canal system under the adopted levels and distribution arrangement B Only the area physically occupied by the canal banks C The entire river basin upstream of the dam regardless of elevation D Only land located above the canal full-supply level

Question 20 ప్రశ్న 20

A proposed gravity canal passes close to two agricultural blocks. Block X lies sufficiently below the canal operating water level for delivery through distributaries, while Block Y lies substantially above that level. Which statement is most appropriate?

A Both blocks are equally commandable by gravity because horizontal distance alone controls command B Block Y is more easily commanded because it is higher C Neither block can receive irrigation from a canal D Block X can potentially be commanded by gravity, whereas Block Y would normally require lifting or a higher-level supply arrangement

Question 21 ప్రశ్న 21

A canal is designed with a uniform bed slope of 1 in 5000. What is the fall in canal bed elevation over a reach 5 km long?

A 0.10 m B 0.50 m C 1.00 m D 5.00 m

Question 22 ప్రశ్న 22

A preliminary canal alignment could command a continuous strip approximately 12 km long with an average gross width of 2 km. Ignoring exclusions at this preliminary stage, what is the gross geometric area of the strip?

A 240 ha B 2400 ha C 12,000 ha D 24,000 ha

Question 23 ప్రశ్న 23

Two possible canal alignments deliver the same required command. Alignment A is slightly longer but stays close to balanced cut-and-fill and crosses two minor drains; Alignment B is shorter but requires long deep cuts, high embankments and six major drainage crossings. What is the most defensible preliminary engineering conclusion?

A Alignment A may be more economical and safer despite its greater length, so both alternatives should be compared on total project consequences B Alignment B must be selected because canal length is the only relevant cost C Alignment A must be rejected because every canal must follow the shortest route D Drainage crossings and earthwork have no effect on canal alignment

Question 24 ప్రశ్న 24

Why should roads, railways, utilities, settlements and other existing infrastructure be considered during canal-alignment selection?

A Because irrigation canals are never permitted to cross any existing infrastructure B Because such features change the unit weight of canal water C Because infrastructure is relevant only after canal construction is complete D Because crossings, relocations, land acquisition, access constraints and social impacts can materially affect constructability and total project cost

Question 25 ప్రశ్న 25

Consider the following statements about canal alignment: I. A ridge canal can often command land on both sides. II. A contour canal commonly commands mainly the lower side and may cross several natural drains. III. A side-slope canal can encounter relatively steep natural ground fall. IV. Canal alignment should consider earthwork and cross-drainage costs in addition to command area. Which option is correct?

A I and II only B I, II and III only C II, III and IV only D I, II, III and IV

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