नेपाल व्यावसायिक लाइसेन्स नेपाल इन्जिनियरिङ काउन्सिल लाइसेन्स तयारी
नेपाल व्यावसायिक लाइसेन्स – नेपाल इन्जिनियरिङ काउन्सिल लाइसेन्स
NEC License Exam · Nepal Professional License Exams
२,४१४ प्रश्न उपलब्ध। मोड छान्नुहोस्:
लाइसेन्स परीक्षा: 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 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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For a plane stress state with normal stresses σx and σy, the centre of Mohr's circle lies on the σ-axis at:
सही उत्तर: क) (σx + σy)/2
The centre of Mohr's circle is at the average normal stress (σx + σy)/2; (σx − σy)/2 is used along with τxy to find the radius.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The maximum stress amplitude that a material can withstand for an indefinitely large number of stress reversals without failing is called its:
सही उत्तर: ख) Endurance limit
The endurance (fatigue) limit is the stress below which failure does not occur however many cycles are applied, as for steels.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The total area under the stress-strain curve of a material up to the point of fracture represents its:
सही उत्तर: ग) Modulus of toughness
Toughness is the energy absorbed per unit volume up to fracture, given by the whole area under the stress-strain curve; resilience covers only the elastic range.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A prismatic bar is subjected to an axial stress σ. With modulus E and Poisson's ratio μ, its volumetric strain is:
सही उत्तर: ग) (σ/E)(1 − 2μ)
Volumetric strain = longitudinal strain + 2 × lateral strain = σ/E − 2μσ/E = (σ/E)(1 − 2μ).
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The bulk modulus K of a material is defined as the ratio of:
सही उत्तर: घ) Direct (hydrostatic) stress to the corresponding volumetric strain
Bulk modulus K = hydrostatic (equal all-round) stress / volumetric strain; shear stress/shear strain is the modulus of rigidity.
💬 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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