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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In self-compacting concrete, viscosity modifying agents (VMAs) are added mainly to:
सही उत्तर: घ) Improve cohesion and resistance to segregation and bleeding
VMAs increase the viscosity of the paste so that highly fluid SCC does not segregate.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Calcium chloride should not be used as an accelerator in reinforced and prestressed concrete mainly because it:
सही उत्तर: ग) Promotes corrosion of the embedded steel
Chloride ions destroy the passive layer on steel and cause corrosion, so chloride accelerators are restricted to plain concrete.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Metakaolin, used as a highly reactive mineral admixture in concrete, is obtained by:
सही उत्तर: ख) Calcining kaolin (china clay) at a moderate temperature
Heating kaolin clay at about 600 to 800°C produces amorphous metakaolin, a strong pozzolan.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Ground granulated blast furnace slag (GGBS) used in concrete is described as a:
सही उत्तर: क) Latent hydraulic material that hydrates when activated by lime or alkalis
GGBS has its own latent hydraulic property, which is activated by the calcium hydroxide and alkalis released from cement.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Sorel cement, used for floorings, is a:
सही उत्तर: घ) Magnesium oxychloride cement
Sorel cement is made by mixing calcined magnesia with a magnesium chloride solution.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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High alumina cement is manufactured by fusing together:
सही उत्तर: ग) Bauxite and limestone
High alumina cement is made by melting a mixture of bauxite and limestone (or lime) and grinding the product.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Masonry cement is intended mainly for:
सही उत्तर: ख) Mortars for masonry and plaster, as it gives good workability and water retention
Masonry cement contains OPC with fine inert or lime materials and air-entraining agents, giving workable mortars of moderate strength.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Cement stored even under good conditions for about three months is generally expected to lose roughly what percentage of its strength?
सही उत्तर: क) About 20%
Cement absorbs moisture from the air during storage; a loss of about 20% at 3 months is commonly assumed.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A standard bag of cement used in Nepal weighs:
सही उत्तर: घ) 50 kg
Cement is supplied in 50 kg bags, which is the usual unit for estimating and batching.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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In a modern dry-process cement plant, the raw meal is heated by kiln exhaust gases before entering the rotary kiln in a:
सही उत्तर: ग) Cyclone preheater
Suspension (cyclone) preheaters use hot kiln gases to preheat and partly calcine the raw meal, saving fuel.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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