संरचना विश्लेषण र RCC – Structures & RCC MCQ
संरचना विश्लेषण र RCC – सिभिल इन्जिनियरिङ
Structures & RCC · Civil Engineering · ५०१ प्रश्न
५०१ प्रश्न उपलब्ध। मोड छान्नुहोस्:
संरचना विश्लेषण र RCC: 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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A continuous beam of three spans resting on four simple supports (one hinge and three rollers) is statically indeterminate to the degree:
सही उत्तर: ख) 2
Reactions = 2 + 1 + 1 + 1 = 5; equations of equilibrium = 3; degree of indeterminacy = 5 − 3 = 2.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A fixed (built-in) support in a plane structure provides how many reaction components?
सही उत्तर: क) 3
A fixed support restrains horizontal and vertical movement and rotation, giving two forces and one moment.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Euler's formula for column buckling is valid only for:
सही उत्तर: ग) Long (slender) columns
Euler's theory assumes failure by elastic buckling, which governs only for long, slender columns; short columns fail by crushing.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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As per IS 456:2000, the unsupported length of a column (with both ends restrained) should not exceed how many times its least lateral dimension?
सही उत्तर: ख) 60
IS 456 limits the unsupported length of a compression member to 60 times its least lateral dimension.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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As per IS 456:2000 (Table 28), the recommended effective length of a column effectively held in position and restrained against rotation at both ends is:
सही उत्तर: क) 0.65 L
IS 456 recommends 0.65L for both ends fixed (theoretical value 0.5L), allowing for imperfect fixity in practice.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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According to Euler's theory, the effective length of a column of length L fixed at one end and hinged at the other is:
सही उत्तर: घ) L/√2
For one end fixed and the other hinged, the theoretical effective length is L/√2 ≈ 0.707L.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A column 4 m long with both ends hinged has flexural rigidity EI = 4000 kN·m². Its Euler buckling load is about:
सही उत्तर: ख) 2467 kN
Pe = π²EI/L² = π² × 4000/4² ≈ 2467 kN (effective length = actual length for hinged ends).
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A solid shaft 60 mm in diameter and 2 m long carries a torque of 5 kN·m. With G = 80 GPa, the angle of twist is about:
सही उत्तर: ग) 5.6°
J = πd⁴/32 ≈ 1.272 × 10⁶ mm⁴; θ = TL/(GJ) = 5 × 10⁶ × 2000/(8 × 10⁴ × 1.272 × 10⁶) ≈ 0.098 rad ≈ 5.6°.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A simply supported beam of 5 m span with flexural rigidity EI = 20 000 kN·m² carries a UDL of 10 kN/m over the whole span. The maximum deflection is about:
सही उत्तर: ख) 4.07 mm
δ = 5wL⁴/(384EI) = 5 × 10 × 5⁴/(384 × 20 000) ≈ 0.00407 m ≈ 4.07 mm.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A hollow rectangular section has outer dimensions 200 mm (width) × 400 mm (depth) and inner dimensions 150 mm × 350 mm. Its moment of inertia about the horizontal centroidal axis is about:
सही उत्तर: ग) 530.7 × 10⁶ mm⁴
I = (BD³ − bd³)/12 = (200 × 400³ − 150 × 350³)/12 ≈ (1280 − 643.1) × 10⁷/12 ≈ 530.7 × 10⁶ mm⁴.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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