इन्जिनियरिङ काउन्सिल (NEC) – Engineering Council (NEC) MCQ
इन्जिनियरिङ काउन्सिल (NEC) – लाइसेन्स परीक्षा
Engineering Council (NEC) · Nepal Professional License Exams · ५९७ प्रश्न
५९७ प्रश्न उपलब्ध। मोड छान्नुहोस्:
इन्जिनियरिङ काउन्सिल (NEC): 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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Clapeyron's theorem of three moments is mainly used for the analysis of:
सही उत्तर: घ) Continuous beams
The three-moment equation relates the support moments at three consecutive supports of a continuous beam.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Maxwell's reciprocal theorem states that, in a linearly elastic structure:
सही उत्तर: क) The deflection at A due to a unit load at B equals the deflection at B due to a unit load at A
Maxwell's reciprocal theorem gives δAB = δBA for unit loads in linearly elastic structures.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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According to Mohr's first moment-area theorem, the change in slope between two points on an elastic beam equals:
सही उत्तर: ग) The area of the M/EI diagram between them
Mohr's first theorem: θB − θA equals the area of the M/EI diagram between A and B; the second theorem deals with the moment of that area (deflection).
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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In the conjugate beam method, a fixed support of the real beam becomes which support in the conjugate beam?
सही उत्तर: ग) A free end
At a fixed end the real slope and deflection are zero, so the conjugate beam must have zero shear and zero moment there, i.e. a free end.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The membrane stress in a thin spherical shell of diameter D and thickness t under internal pressure p is:
सही उत्तर: क) pD/(4t)
In a sphere the stress is the same in all directions and equals pD/(4t), half the hoop stress of a cylinder of the same D and t.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A thin cylinder of internal diameter 1000 mm and wall thickness 10 mm is subjected to an internal pressure of 2 MPa. The hoop (circumferential) stress is:
सही उत्तर: घ) 100 MPa
Hoop stress = pD/(2t) = (2 × 1000)/(2 × 10) = 100 MPa.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A steel bar 2 m long with cross-sectional area 500 mm² carries an axial tensile load of 100 kN. If E = 200 GPa, its elongation is:
सही उत्तर: ख) 2 mm
δ = PL/(AE) = (100,000 × 2000)/(500 × 200,000) = 2 mm.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A uniform bar of length L, unit weight γ and modulus E hangs vertically from its top end. Its elongation due to its own weight is:
सही उत्तर: ख) γL²/(2E)
Axial force varies linearly from zero at the bottom to γAL at the top, so the elongation is half that of a full end load: γL²/(2E).
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The elastic section modulus of a solid circular section of diameter d is:
सही उत्तर: घ) πd³/32
Z = I/ymax = (πd⁴/64)/(d/2) = πd³/32.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The moment of inertia of a hollow circular section with external diameter D and internal diameter d about a diameter is:
सही उत्तर: क) π(D⁴ − d⁴)/64
The I of a solid circle about a diameter is πD⁴/64, so for the hollow section it is π(D⁴ − d⁴)/64 (π/32 would be the polar moment).
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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