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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Bituminous paint is most suitable for:
सही उत्तर: ख) Iron and steel work in contact with water or soil, such as pipes and tanks
Bituminous paints form a water-resistant, alkali-resistant film, useful for underground and submerged metal work.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Low-emissivity (low-E) glass used in windows has a thin coating that mainly:
सही उत्तर: ग) Reduces the transfer of radiant heat while allowing visible light to pass
Low-E coatings reflect long-wave infrared heat, improving thermal insulation without greatly reducing daylight.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Hard glass (Bohemian glass), used for glassware that must withstand high temperatures, is mainly a:
सही उत्तर: ख) Potash-lime glass
Potash-lime glass has a high fusion point and resists heat and chemicals better than ordinary soda-lime glass.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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In the designation of rolled steel sections, 'ISA' stands for:
सही उत्तर: घ) Indian Standard Angle
ISA denotes an angle section, e.g. ISA 50 × 50 × 6.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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In grey cast iron, most of the carbon is present in the form of:
सही उत्तर: ग) Graphite flakes
Free graphite flakes give grey cast iron its grey fracture surface, good machinability and low tensile strength.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Malleable cast iron is produced by:
सही उत्तर: ख) Prolonged annealing (heat treatment) of white cast iron
Long annealing of white cast iron converts its brittle cementite into compact graphite nodules, giving some ductility.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Wrought iron was traditionally produced from pig iron by the:
सही उत्तर: क) Puddling process
In a puddling furnace, molten pig iron is stirred so that carbon is oxidised, producing low-carbon wrought iron.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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In the Bessemer process of steel making:
सही उत्तर: घ) Air is blown through molten pig iron in a converter to oxidise impurities
The Bessemer converter blows air through molten pig iron, burning out carbon, silicon and manganese.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Excess phosphorus in steel mainly causes:
सही उत्तर: ग) Cold shortness (brittleness at low temperatures)
Phosphorus makes steel brittle at ordinary and low temperatures, a defect called cold shortness.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Excess sulphur in steel makes it brittle when worked at high temperature. This defect is called:
सही उत्तर: ख) Hot (red) shortness
Sulphur forms low-melting iron sulphide at grain boundaries, causing cracking during hot working (hot shortness).
💬 टिप्पणी / गल्ती रिपोर्ट (०)
यी अभ्यास प्रश्न हुन्, आधिकारिक प्रश्न होइनन्। पाठ्यक्रम, विज्ञापन र नतिजाका लागि सम्बन्धित निकायको आधिकारिक वेबसाइट हेर्नुहोस्। उत्तरमा गल्ती भेटे प्रश्नमुनिको "टिप्पणी / गल्ती रिपोर्ट" मा लेख्नुहोस्।
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