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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Creep of a material is best defined as:
सही उत्तर: घ) Gradual increase of strain with time under a constant sustained stress
Creep is time-dependent deformation under sustained constant stress, important in concrete and in metals at high temperature.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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In a tensile test, the ductility of a material is commonly expressed by its:
सही उत्तर: घ) Percentage elongation and percentage reduction in area at fracture
Ductility is the ability to deform plastically before fracture, measured by percentage elongation and reduction in area.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Which theory of failure is generally considered the most suitable for ductile materials?
सही उत्तर: ख) Maximum distortion energy (shear strain energy) theory (von Mises)
Experiments show ductile metals yield in agreement with the distortion energy (von Mises) theory; Rankine's theory suits brittle materials.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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An element is in a state of pure shear with shear stress τ. Its principal stresses are:
सही उत्तर: क) +τ and −τ, on planes at 45° to the shear planes
Mohr's circle for pure shear is centred at the origin with radius τ, giving σ1 = +τ and σ2 = −τ on planes inclined at 45°.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The axial deflection of a close-coiled helical spring with mean coil radius R, wire diameter d, n active turns and modulus of rigidity G under load W is:
सही उत्तर: ग) 64WR³n/(Gd⁴)
Deflection δ = 64WR³n/(Gd⁴), which is equivalent to 8WD³n/(Gd⁴) in terms of mean coil diameter D.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The stress produced in a bar by a suddenly applied axial load is how many times the stress produced when the same load is applied gradually?
सही उत्तर: ग) Twice
Equating work done P·δ to strain energy σ²AL/(2E) for a sudden load gives σ = 2P/A, twice the gradual-load stress P/A.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A two-hinged parabolic arch under vertical loads is statically indeterminate to what degree?
सही उत्तर: घ) One
It has four reaction components (two at each hinge) and three equilibrium equations, so it is indeterminate to the first degree; the horizontal thrust is the redundant.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A simply supported beam of span 6 m carries a central point load of 20 kN. The maximum bending moment is:
सही उत्तर: क) 30 kN·m
Mmax = WL/4 = 20 × 6/4 = 30 kN·m at mid-span.
💬 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 uniformly distributed load w per unit length over the whole span is:
सही उत्तर: ख) wL²/12
For a fixed beam under full-span UDL, the fixed-end moments are wL²/12 (hogging) and the mid-span moment is wL²/24.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The slope-deflection method of structural analysis is classified as a:
सही उत्तर: ख) Displacement (stiffness) method with joint rotations and displacements as unknowns
In the slope-deflection method the basic unknowns are joint rotations and sway displacements, so it is a displacement (stiffness) method.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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