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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A 12 mm diameter steel bar carries an axial tensile load of 50 kN. The tensile stress in the bar is about:
सही उत्तर: ग) 442 N/mm²
Area = π/4 × 12² = 113.1 mm²; stress = 50,000/113.1 ≈ 442 N/mm².
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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For a cement whose standard consistency is 30%, the water to be added to 400 g of cement for the initial and final setting time test (0.85P) is:
सही उत्तर: ख) 102 ml
Water = 0.85 × 30% × 400 g = 25.5% × 400 = 102 ml.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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In a tensile test on a steel bar, the gauge length of 200 mm becomes 236 mm at fracture. The percentage elongation is:
सही उत्तर: क) 18%
Elongation = (236 − 200)/200 × 100 = 18%.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A 150 mm × 150 mm concrete beam on a 600 mm span is tested under two-point (third-point) loading and fails at a total load of 30 kN, with fracture within the middle third. Its flexural strength is about:
सही उत्तर: घ) 5.33 N/mm²
Modulus of rupture = PL/(bd²) = 30,000 × 600 / (150 × 150²) = 5.33 N/mm².
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A concrete cylinder 150 mm in diameter and 300 mm long fails at a load of 200 kN in the split tensile test. Its splitting tensile strength is about:
सही उत्तर: ग) 2.83 N/mm²
fct = 2P/(πDL) = 2 × 200,000 / (π × 150 × 300) ≈ 2.83 N/mm².
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A mix requires 600 kg of dry sand per batch. If the sand at site contains 3% free surface moisture, the mass of wet sand to be weighed and the change in mixing water are:
सही उत्तर: ख) 618 kg of sand; reduce water by 18 litres
Wet sand = 600 × 1.03 = 618 kg; it brings 18 kg of free water, so the added water is reduced by 18 litres.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Taking the specific gravity of cement as 3.15, the absolute volume of one 50 kg bag of cement is about:
सही उत्तर: क) 0.0159 m³
Absolute volume = mass ÷ (specific gravity × density of water) = 50 ÷ (3.15 × 1000) = 0.0159 m³.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The Boucherie process, used for preserving freshly cut bamboo, works by:
सही उत्तर: घ) Forcing the preservative through the vessels of green bamboo under pressure, displacing the sap
In the Boucherie (sap displacement) method a preservative such as boric acid–borax solution is pushed through fresh culms, replacing the sap.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Shuttering oil or another release agent is applied to formwork mainly to:
सही उत्तर: ग) Prevent the concrete from sticking to the formwork, giving easy stripping and a clean surface
Release agents form a thin film that stops concrete bonding to the forms, protecting both the forms and the concrete surface.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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In preplaced (prepacked) aggregate concrete:
सही उत्तर: ख) Coarse aggregate is first placed in the formwork and the voids are then filled by injecting cement grout
Grout is pumped into the voids of pre-placed coarse aggregate, useful for underwater work and repairs.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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