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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The two main types of raw materials used in the manufacture of Portland cement are:
सही उत्तर: ख) Calcareous (limestone) and argillaceous (clay or shale)
Cement is made by burning a mix of calcareous material (lime source) and argillaceous material (silica and alumina source).
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The presence of lumps of lime (lime nodules) in brick earth is harmful because:
सही उत्तर: घ) Quicklime formed during burning slakes on wetting and causes bricks to split
Lime lumps turn to quicklime on burning; on contact with moisture they slake and expand, disintegrating the brick.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Excess of which constituent in brick earth causes bricks to crack and warp on drying?
सही उत्तर: ग) Alumina (clay)
Alumina gives plasticity, but too much makes bricks shrink, crack and warp during drying and burning.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Compared with the wet process, the dry process of cement manufacture:
सही उत्तर: ग) Consumes less fuel because no slurry water has to be evaporated
In the dry process the raw meal is dry, so less heat is needed than for evaporating water from slurry in the wet process.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The minimum compressive strength of a first-class brick is generally taken as:
सही उत्तर: घ) 10.5 N/mm²
First-class bricks are expected to have a crushing strength of at least about 10.5 N/mm² (105 kg/cm²).
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Good building bricks should not absorb more than what percentage of water by weight after 24 hours of immersion?
सही उत्तर: घ) 20%
First-class bricks should have water absorption not exceeding about 20% of their dry weight (24 hour immersion).
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The traditional (non-modular) brick size commonly used in Nepal is approximately:
सही उत्तर: ख) 230 mm × 115 mm × 57 mm
Traditional bricks are roughly 9 in × 4.5 in × 2.25 in, i.e., about 230 × 115 × 57 mm.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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In the manufacture of Portland cement, the raw materials fuse into clinker in the rotary kiln at a temperature of about:
सही उत्तर: ग) 1400°C to 1500°C
The burning zone of a cement kiln reaches about 1400–1500°C, where partial fusion forms clinker.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Convert the whole circle bearing 300° into a reduced (quadrantal) bearing.
सही उत्तर: क) N 60° W
300° lies in the NW quadrant, so RB = N 60° W.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The fore bearing (WCB) of a line is 349°. What is its back bearing?
सही उत्तर: घ) 169°
BB = FB − 180° = 169°.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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