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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The shape factor of a solid circular cross-section in plastic analysis is about:
सही उत्तर: ख) 1.70
Shape factor = Zp/Ze = (d³/6)/(πd³/32) = 16/(3π) ≈ 1.70 for a solid circle; 1.5 is for a rectangle and about 1.14 for I-sections.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The degree of static indeterminacy of a rigid-jointed plane frame having m members, r external reaction components and j joints is:
सही उत्तर: ख) 3m + r − 3j
Each member of a rigid plane frame has 3 unknown internal forces and each joint gives 3 equilibrium equations, so Ds = 3m + r − 3j.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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In the unit load (virtual work) method, the deflection at a point of a beam due to bending is obtained from:
सही उत्तर: ग) ∫ M m dx / (EI)
Deflection δ = ∫ M m dx/EI, where M is the moment due to actual loads and m the moment due to a unit load at the point in the direction of δ.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The influence line diagram for the reaction at one support of a simply supported beam is:
सही उत्तर: घ) A triangle with ordinate 1 at that support, reducing to zero at the other support
As a unit load moves from that support to the other, the reaction falls linearly from 1 to 0, giving a triangular influence line.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A single concentrated load W rolls across a simply supported beam of span L. The absolute maximum bending moment in the beam is:
सही उत्तर: क) WL/4, when the load is at mid-span
The bending moment under a point load at distance x is Wx(L − x)/L, which is maximum (WL/4) when x = L/2.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A propped cantilever of span L carries a uniformly distributed load w over its entire span. The reaction at the prop (simple support) is:
सही उत्तर: क) 3wL/8
By compatibility (zero deflection at the prop), R = 3wL/8 at the prop and 5wL/8 at the fixed end.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The maximum deflection of a beam fixed at both ends, of span L, carrying a central point load W is:
सही उत्तर: ख) WL³/(192EI)
Fixing both ends reduces the central deflection to one-quarter of the simply supported value: WL³/(48EI) ÷ 4 = WL³/(192EI).
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The fixed-end moment at each end of a fixed-fixed beam of span L carrying a single point load W at mid-span is:
सही उत्तर: ग) WL/8
For a central point load on a fixed beam, each fixed-end moment is WL/8 (hogging), and the mid-span sagging moment is also WL/8.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A shaft is subjected simultaneously to a bending moment M and a torque T. The equivalent torque Te used in design by the maximum shear stress theory is:
सही उत्तर: घ) √(M² + T²)
Equivalent torque Te = √(M² + T²); the expression ½[M + √(M² + T²)] is the equivalent bending moment.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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For a plane stress state (σx, σy, τxy), the inclination θp of the principal planes is given by:
सही उत्तर: घ) tan 2θp = 2τxy/(σx − σy)
Principal planes are those on which the shear stress is zero, which gives tan 2θp = 2τxy/(σx − σy).
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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