इन्जिनियरिङ सेवा असिस्टेन्ट सब-इन्जिनियर (चौथो तह) – प्राविधिक पत्र
इन्जिनियरिङ सेवा – असिस्टेन्ट सब-इन्जिनियर (चौथो तह)
Assistant Sub-Engineer – 4th Level · Engineering Service
१,९४० 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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As per IS 456, the nominal mix proportion (cement : fine aggregate : coarse aggregate) for M15 grade concrete is:
सही उत्तर: ख) 1 : 2 : 4
IS 456 nominal mixes: M10 = 1:3:6, M15 = 1:2:4, M20 = 1:1.5:3.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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During hydration of cement, calcium hydroxide is released. Its presence is important because it:
सही उत्तर: घ) Keeps the concrete alkaline, which protects embedded steel from corrosion
Calcium hydroxide gives a high pH that keeps a passive protective film on reinforcing steel.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A simple field test for good quality cement is that when a hand is thrust into a bag of cement:
सही उत्तर: ख) It should feel cool
Good cement feels cool inside the bag; warmth or lumps indicate partial hydration due to moisture.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Supersulphated cement is made mainly from granulated blast furnace slag and calcium sulphate, and is particularly suitable for:
सही उत्तर: ग) Structures exposed to sulphate-bearing soils or sea water
Supersulphated cement has high resistance to sulphates and sea water.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Oil well cement is specially designed to:
सही उत्तर: घ) Remain workable (retarded setting) at high temperatures and pressures in deep wells
Oil well cement contains retarders so that it remains pumpable under the high temperature and pressure found in deep oil wells.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Quick setting cement is most suitable for:
सही उत्तर: घ) Concreting under water, especially in running water
Quick setting cement sets within a few minutes, so it is useful where concrete must set before water washes it away.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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In the grades of OPC designated 33, 43 and 53, the number denotes the:
सही उत्तर: घ) Minimum 28-day compressive strength of standard mortar cubes in N/mm²
For example, 53 grade OPC must reach at least 53 N/mm² compressive strength at 28 days.
💬 टिप्पणी / गल्ती रिपोर्ट (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)
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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