इन्जिनियरिङ सेवा असिस्टेन्ट सब-इन्जिनियर (चौथो तह) – प्राविधिक पत्र
इन्जिनियरिङ सेवा – असिस्टेन्ट सब-इन्जिनियर (चौथो तह)
Assistant Sub-Engineer – 4th Level · Engineering Service
१,५०३ प्रश्न उपलब्ध। मोड छान्नुहोस्:
प्राविधिक पत्र: प्रश्न र उत्तर
सही लागेको विकल्पमा थिच्नुहोस्। सही भए हरियो, गलत भए रातो देखिन्छ; ५ सेकेन्डपछि सही उत्तर र व्याख्या देखिन्छ।
सही: ० / ०
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In the Vicat test for setting times of cement, the initial setting time is found with a needle of cross-section 1 mm square, while the final setting time is found with:
सही उत्तर: क) A needle fitted with an annular collar (attachment)
Final set is reached when the needle makes an impression but the annular attachment fails to do so.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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In the autoclave soundness test, the expansion of ordinary Portland cement should not exceed:
सही उत्तर: ग) 0.8%
The autoclave test, which detects unsoundness due to both lime and magnesia, limits expansion to 0.8%.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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In the Le Chatelier soundness test, the expansion of ordinary Portland cement should not exceed:
सही उत्तर: ख) 10 mm
The Le Chatelier expansion limit for OPC is 10 mm, indicating that free lime is within safe limits.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Among the main Bogue compounds of cement, which one contributes least to strength and is responsible for the grey colour?
सही उत्तर: ख) Tetracalcium aluminoferrite (C4AF)
C4AF has little cementing value; it acts mainly as a flux in manufacture and gives cement its grey colour.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Excess free lime in cement is harmful mainly because it:
सही उत्तर: ग) Causes unsoundness, i.e. delayed expansion and cracking of the set cement
Free lime hydrates slowly after the cement has set, causing expansion and cracking; this is unsoundness.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The silica (SiO2) content of ordinary Portland cement is typically in the range:
सही उत्तर: ख) 17% to 25%
Typical OPC contains about 60–67% CaO, 17–25% SiO2, 3–8% Al2O3 and 0.5–6% Fe2O3.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Sandstone is a:
सही उत्तर: घ) Sedimentary rock composed mainly of sand grains cemented together
Sandstone is a sedimentary (siliceous) rock formed by cementation of quartz sand grains.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Limestone and marble are classified chemically as:
सही उत्तर: ख) Calcareous rocks
Both consist mainly of calcium carbonate, so they are calcareous rocks.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Rocks in which clay (alumina) is the predominant constituent, such as slate and laterite, are classified chemically as:
सही उत्तर: घ) Argillaceous rocks
Argillaceous rocks have clay or alumina as the main constituent; siliceous rocks are silica-rich and calcareous rocks are lime-rich.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Rocks such as slate and schist, which can be split into thin layers along definite planes developed by metamorphism, are called:
सही उत्तर: क) Foliated rocks
Foliation is a layered structure developed by pressure during metamorphism, as seen in slate and schist.
💬 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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