सिभिल इन्जिनियरिङ
सिभिल इन्जिनियरिङ
Civil Engineering · ५,१७१ प्रश्न
५,१७१ प्रश्न उपलब्ध। मोड छान्नुहोस्:
सिभिल इन्जिनियरिङ: 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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Cavitation in hydraulic machines occurs when the local pressure falls below the:
सही उत्तर: ख) Vapour pressure of the liquid
When pressure drops below vapour pressure, vapour bubbles form and collapse, causing cavitation damage.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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In irrigation engineering, 'delta' of a crop refers to:
सही उत्तर: घ) Total depth of water required by the crop during its base period
Delta is the total depth of water needed by a crop over its base period.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The theoretical velocity of a jet from an orifice under a constant head of 5 m (g = 9.81 m/s²) is about:
सही उत्तर: घ) 9.90 m/s
By Torricelli's theorem V = √(2gH) = √(2 × 9.81 × 5) ≈ 9.90 m/s.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A cross-drainage work in which the natural drain passes over the irrigation canal is called a:
सही उत्तर: ख) Super passage
In a super passage the drain is carried over the canal; in an aqueduct the canal is carried over the drain.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Which of the following is a Rabi crop?
सही उत्तर: क) Wheat
Wheat is sown in winter (October–November) and harvested in spring, so it is a Rabi crop.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The coefficient of discharge (Cd) of an orifice is related to the coefficient of contraction (Cc) and coefficient of velocity (Cv) as:
सही उत्तर: ग) Cd = Cc × Cv
Actual discharge = Cc × area × Cv × theoretical velocity, so Cd = Cc × Cv.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A floating body is in stable equilibrium when:
सही उत्तर: क) Its metacentre lies above its centre of gravity
Positive metacentric height (M above G) gives a restoring couple, so the body is stable.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Which method of irrigation generally gives the highest water application efficiency?
सही उत्तर: ग) Drip (trickle) irrigation
Drip irrigation delivers water directly to the root zone with very little runoff or deep percolation loss.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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In steady laminar flow through a circular pipe, the maximum velocity at the centre is equal to:
सही उत्तर: ग) Twice the mean velocity
The parabolic velocity profile in laminar pipe flow gives Vmax = 2 Vmean.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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For a dry cohesionless infinite slope with φ = 30° and slope angle 20°, the factor of safety is about:
सही उत्तर: ख) 1.59
FS = tanφ/tanβ = 0.577/0.364 ≈ 1.59.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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