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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Tube settlers are installed in sedimentation tanks mainly to:
सही उत्तर: क) Increase the effective settling area and improve removal in a smaller tank
Inclined tubes create many shallow settling zones, reducing the settling distance and allowing higher surface loading.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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In a dual-media rapid filter, the coarse but lighter upper layer is usually made of:
सही उत्तर: ख) Anthracite coal
Anthracite (lower density, larger size) stays on top of finer sand after backwashing, giving deeper penetration of solids and longer runs.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A treatment plant treats 5 MLD of water with an alum dose of 20 mg/L. The alum required per day is:
सही उत्तर: ख) 100 kg
Alum = dose × flow = 20 g/m³ × 5000 m³/day = 100,000 g/day = 100 kg/day.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A village needs 2.4 MLD of water treated by slow sand filters at a filtration rate of 0.1 m/h. The required filter area is:
सही उत्तर: घ) 1000 m²
Flow = 2400 m³/day = 100 m³/h; area = 100/0.1 = 1000 m².
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The typical rate of filtration of a slow sand filter is about:
सही उत्तर: ख) 0.1 to 0.2 m/h
Slow sand filters work at about 0.1–0.2 m/h (2.4–4.8 m³/m²/day), roughly 30–50 times slower than rapid sand filters.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Horizontal roughing filters, used in several small water schemes in Nepal, are mainly provided to:
सही उत्तर: क) Reduce high turbidity of river water before slow sand filtration
Roughing filters of graded gravel remove much of the suspended solids so that slow sand filters downstream do not clog quickly.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The correct usual sequence of units in a conventional surface water treatment plant is:
सही उत्तर: घ) Screening → coagulation/flocculation → sedimentation → filtration → disinfection
Coarse matter is screened first, flocs are formed and settled, the remaining particles are filtered, and disinfection is done last.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Nepal's National Drinking Water Quality Standards (NDWQS) were first issued in:
सही उत्तर: ग) 2062 BS
The National Drinking Water Quality Standards were issued in 2062 BS, setting physical, chemical and microbiological limits for drinking water.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A water contains 40 mg/L of calcium (Ca²⁺). Its calcium hardness expressed as CaCO3 is:
सही उत्तर: ग) 100 mg/L
Hardness as CaCO3 = 40 × (50/20) = 100 mg/L (equivalent weights: CaCO3 = 50, Ca = 20).
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Residual chlorine in a water supply is commonly measured in the field using the:
सही उत्तर: ख) DPD (or orthotolidine) colorimetric test
DPD (and the older orthotolidine) reagent develops a colour proportional to chlorine concentration.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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