हाइड्रोलिक्स र सिँचाइ – Hydraulics & Irrigation MCQ
हाइड्रोलिक्स र सिँचाइ – सिभिल इन्जिनियरिङ
Hydraulics & Irrigation · Civil Engineering · ४०९ प्रश्न
४०९ प्रश्न उपलब्ध। मोड छान्नुहोस्:
हाइड्रोलिक्स र सिँचाइ: प्रश्न र उत्तर
सही लागेको विकल्पमा थिच्नुहोस्। सही भए हरियो, गलत भए रातो देखिन्छ; ३ सेकेन्डपछि सही उत्तर र व्याख्या देखिन्छ।
सही: ० / ०
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A shaft (morning glory) spillway is one in which water:
सही उत्तर: ख) Enters a funnel-shaped crest and drops through a vertical shaft into a tunnel
In a morning glory spillway the circular crest feeds a vertical shaft connected to a horizontal conduit; side channel spillways flow parallel to the crest.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A fish ladder at a weir or barrage is provided to:
सही उत्तर: क) Allow migratory fish to pass upstream across the structure
A fish ladder (fish pass) is a series of pools or baffles that lets fish move past the structure.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A divide wall at diversion headworks is provided to:
सही उत्तर: ख) Separate the undersluice pocket from the main weir and create a still pond near the head regulator
The divide wall forms a still pocket in front of the head regulator so silt settles and can be sluiced out, and keeps cross-currents away.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A barrage differs from a weir mainly in that:
सही उत्तर: ख) The pond level is controlled mainly by gates, with a low or no raised crest
In a barrage most of the ponding is done by gates over a low crest; in a weir the raised crest does most of the ponding.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A weir floor has 30 m of horizontal creep and two vertical cut-offs giving 8 m of total vertical creep, under a head of 4 m. Lane's weighted creep ratio is:
सही उत्तर: ख) 4.5
Weighted creep = 8 + 30/3 = 18 m; ratio = 18/4 = 4.5.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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According to Lane's weighted creep theory, horizontal creep lengths are counted at what fraction of vertical creep lengths?
सही उत्तर: घ) One-third
Lane found vertical paths more effective in resisting seepage, so weighted creep = vertical length + (1/3) horizontal length.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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At a diversion headworks, a silt excluder is constructed:
सही उत्तर: क) In the river bed in front of the head regulator to prevent bed silt from entering the canal
A silt excluder (undersluice pocket) keeps silt out at the head; a silt ejector (extractor) removes silt that has already entered the canal.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A canal fall is provided where:
सही उत्तर: घ) The natural ground slope is steeper than the designed canal bed slope
Falls drop the canal bed in steps so that the bed slope remains as designed while following a steeper terrain.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A contour canal is one that is aligned:
सही उत्तर: घ) Roughly parallel to the contours of the area, irrigating land on one side only
A contour canal follows the contours (common in hills) and commands land only on its lower side; it needs many cross-drainage works.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Using Lacey's regime velocity V = (Q·f²/140)^(1/6), the velocity for Q = 100 m³/s and silt factor f = 1 is about:
सही उत्तर: ग) 0.95 m/s
V = (100 × 1/140)^(1/6) = (0.714)^(1/6) ≈ 0.95 m/s.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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