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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During the early hydration of cement, the reaction of tricalcium aluminate with gypsum produces:
सही उत्तर: ख) Ettringite (calcium sulphoaluminate hydrate)
Gypsum reacts with C3A to form ettringite, which coats the C3A grains and prevents flash set.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A pozzolana is a material that:
सही उत्तर: क) Is siliceous or aluminous, has little binding value by itself, but reacts with calcium hydroxide in the presence of water to form cementitious compounds
Pozzolanas such as fly ash and surkhi react with the lime released by cement hydration to form additional C-S-H.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Increasing the fineness of cement generally:
सही उत्तर: घ) Increases the rate of hydration and early strength gain
Finer particles expose more surface area to water, so hydration and early strength development are faster.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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As per IS 269, the maximum permissible magnesia (MgO) content in ordinary Portland cement is:
सही उत्तर: ग) 6%
MgO is limited to 6% because excess periclase hydrates slowly and causes unsoundness (delayed expansion).
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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As per IS 269, the ratio of alumina to iron oxide in ordinary Portland cement should not be less than:
सही उत्तर: ख) 0.66
The specification requires the alumina/iron oxide ratio to be at least 0.66.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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As per IS 269, the lime saturation factor of ordinary Portland cement should lie between:
सही उत्तर: क) 0.66 and 1.02
The lime saturation factor limits are 0.66 to 1.02; too much lime causes unsoundness and too little gives weak cement.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The chemical composition of tricalcium aluminate, written in oxide notation, is:
सही उत्तर: घ) 3CaO·Al2O3
C3A stands for 3CaO·Al2O3; C3S is 3CaO·SiO2, C2S is 2CaO·SiO2 and C4AF is 4CaO·Al2O3·Fe2O3.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Which Bogue compound is normally present in the largest proportion in ordinary Portland cement?
सही उत्तर: ग) Tricalcium silicate (C3S)
C3S usually makes up roughly 40% to 55% of OPC, more than any other compound.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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An error caused by using a tape that is consistently too short is an example of a:
सही उत्तर: ग) Systematic (cumulative) error
A wrong tape length affects every measurement in the same direction, so it is systematic and can be corrected.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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In GIS, a 'buffer' operation creates:
सही उत्तर: ग) A zone of specified distance around a point, line or polygon feature
Buffering generates polygons at a set distance around features, e.g., 50 m on each side of a river.
💬 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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