हाइड्रोलिक्स र सिँचाइ – Hydraulics & Irrigation MCQ
हाइड्रोलिक्स र सिँचाइ – सिभिल इन्जिनियरिङ
Hydraulics & Irrigation · Civil Engineering · ४०३ प्रश्न
४०३ 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 storm of 6 hours has hourly rainfall intensities of 2, 4, 6, 4, 2 and 1 cm/h, and the observed direct runoff is 7 cm. The φ-index is about:
सही उत्तर: ग) 2.33 cm/h
Assuming φ lies between 2 and 4 cm/h: (4 − φ) + (6 − φ) + (4 − φ) = 7 ⇒ 14 − 3φ = 7 ⇒ φ ≈ 2.33 cm/h (consistent with the assumption).
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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An air vessel is fitted to the suction and delivery pipes of a:
सही उत्तर: ख) Reciprocating pump
Air vessels smooth out the fluctuating flow of a reciprocating pump, saving power and allowing higher speeds.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The Net Positive Suction Head (NPSH) of a pump must be kept above the required value mainly to avoid:
सही उत्तर: क) Cavitation at the impeller inlet
If suction pressure falls near vapour pressure, vapour bubbles form and collapse on the impeller (cavitation); adequate NPSH prevents this.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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To deliver water against a very high head with centrifugal pumps, the impellers are arranged:
सही उत्तर: ग) In series (multistage pump)
In series the same discharge passes through each impeller and the heads add up; parallel arrangement increases discharge instead.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A centrifugal pump delivers 0.05 m³/s of water against a total head of 40 m with an overall efficiency of 75%. The power required is about:
सही उत्तर: क) 26.2 kW
P = ρgQH/η = 1000 × 9.81 × 0.05 × 40/0.75 ≈ 26 160 W ≈ 26.2 kW.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Model studies of flow through pipes, where viscous forces dominate, are based on equality of the:
सही उत्तर: ख) Reynolds number
In closed-conduit flow gravity has no effect on the flow pattern and viscous forces govern, so Reynolds similarity is used.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Gradually varied flow (GVF) in an open channel is flow in which the depth:
सही उत्तर: ग) Changes slowly over a long distance
In GVF depth changes gradually (e.g. backwater curves); rapidly varied flow such as a hydraulic jump changes depth abruptly.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The relation between Chezy's coefficient C and Manning's n is:
सही उत्तर: ख) C = R^(1/6)/n
Equating Chezy V = C√(RS) with Manning V = (1/n)R^(2/3)S^(1/2) gives C = R^(1/6)/n.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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In a circular sewer or pipe flowing partly full, the discharge is maximum when the depth of flow is about:
सही उत्तर: ग) 0.94 D
Maximum discharge occurs at about 0.938D and maximum velocity at about 0.81D, both slightly below full depth.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The most economical trapezoidal channel section is one whose shape is half of a:
सही उत्तर: ग) Regular hexagon (side slopes at 60° to horizontal)
The best trapezoidal section is a half-hexagon with side slope 1/√3 (H) : 1 (V), i.e. sides at 60° to the horizontal.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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