निर्माण सामग्री – Construction Materials MCQ
निर्माण सामग्री – सिभिल इन्जिनियरिङ
Construction Materials · Civil Engineering · १,००८ प्रश्न
१,००८ प्रश्न उपलब्ध। मोड छान्नुहोस्:
निर्माण सामग्री: 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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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)
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Veneers for plywood that are cut by rotating a log against a long knife, producing a continuous sheet, are called:
सही उत्तर: घ) Rotary-cut veneers
In rotary cutting, the log is turned in a lathe against a knife, peeling off a continuous veneer.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Deodar, a durable softwood of the Himalayan region, has the botanical name:
सही उत्तर: ग) Cedrus deodara
Deodar is Cedrus deodara; Pinus roxburghii is chir pine and Shorea robusta is sal.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The Rueping process of timber preservation is an example of a/an:
सही उत्तर: ख) Empty-cell pressure process
In the Rueping process, initial air pressure makes the expanding air expel excess preservative, leaving the cell walls coated but the cells largely empty.
💬 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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