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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In a rectangular channel the critical depth is 0.9 m. The critical velocity is about:
सही उत्तर: क) 2.97 m/s
At critical flow Fr = 1, so Vc = √(g·yc) = √(9.81 × 0.9) ≈ 2.97 m/s.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The Moody diagram relates the friction factor to the:
सही उत्तर: घ) Reynolds number and relative roughness
The Moody chart plots Darcy f against Re for various values of relative roughness ε/D.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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If a valve at the end of a pipeline is closed instantly, the pressure rise (Joukowsky) for water (ρ = 1000 kg/m³) flowing at 2 m/s with wave velocity 1000 m/s is:
सही उत्तर: क) 2.0 MPa
Δp = ρ·c·V = 1000 × 1000 × 2 = 2 × 10⁶ Pa = 2.0 MPa.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A siphon is a pipeline in which part of the pipe lies:
सही उत्तर: ग) Above the hydraulic gradient line, so pressure there is below atmospheric
In a siphon water rises above the upstream water level; the summit is under negative (sub-atmospheric) pressure.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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When pipes are connected in series, which quantity is the same in each pipe?
सही उत्तर: क) Discharge
In series the same flow passes through each pipe and the total head loss is the sum of individual losses.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The head loss at the exit of a pipe discharging into a large reservoir is:
सही उत्तर: ख) V²/2g
The entire velocity head is lost at the outlet into a reservoir (exit loss = V²/2g).
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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When power is transmitted through a pipeline with supply head H, the transmission is maximum when the head lost in friction is:
सही उत्तर: क) H/3
Maximum power occurs when hf = H/3; the corresponding efficiency is 2/3, i.e. about 66.7%.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Francis' formula for a rectangular weir with end contractions reduces the effective crest length by:
सही उत्तर: ग) 0.1·n·H, where n is the number of end contractions
Francis: Q = 1.84(L − 0.1nH)H^1.5; each end contraction shortens the effective length by 0.1H.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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In a Cipolletti weir, the sides of the trapezoidal notch are inclined at:
सही उत्तर: ग) 1 horizontal to 4 vertical
The 1H:4V side slopes add discharge that compensates for the loss due to end contractions, so the rectangular weir formula applies without correction.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A broad-crested weir 2 m long works under a head of 0.5 m. Using the maximum discharge formula Q = 1.705·b·H^1.5, the discharge is about:
सही उत्तर: घ) 1.21 m³/s
Q = 1.705 × 2 × 0.5^1.5 = 3.41 × 0.354 ≈ 1.21 m³/s (Cd taken as 1).
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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