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 rotational stiffness at the near end of a prismatic beam whose far end is hinged (pinned) is:
सही उत्तर: ग) 3EI/L
Stiffness is 4EI/L when the far end is fixed and reduces to 3EI/L when the far end is hinged.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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In the moment distribution method, the carry-over factor from the near end to a FIXED far end of a prismatic member is:
सही उत्तर: ख) 1/2
A moment applied at the near end of a prismatic member induces half that moment at a fixed far end, so the carry-over factor is 1/2.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The core (kern) of a solid circular section of diameter d, within which a compressive load produces no tension anywhere, is a concentric circle of diameter:
सही उत्तर: क) d/4
No tension develops if eccentricity e ≤ Z/A = d/8, so the kern is a circle of radius d/8, i.e. diameter d/4.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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For a simply supported plane pin-jointed truss with m members and j joints (three reaction components), the condition for a perfect (just rigid and determinate) truss is:
सही उत्तर: घ) m = 2j − 3
Each joint gives two equilibrium equations (2j); with three reactions, members needed m = 2j − 3.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The maximum deflection of a cantilever of length L carrying a uniformly distributed load w per unit length over its whole length is:
सही उत्तर: ग) wL⁴/(8EI)
For a cantilever under full-length UDL, the free-end deflection is wL⁴/(8EI).
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The maximum deflection of a cantilever of length L carrying a point load W at its free end is:
सही उत्तर: ख) WL³/(3EI)
For a cantilever with an end point load, the free-end deflection is WL³/(3EI).
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The Euler critical (crippling) load for a long column of effective length Le and flexural rigidity EI is:
सही उत्तर: क) π²EI/Le²
Euler's buckling load is Pcr = π²EI/Le², where Le is the effective length depending on end conditions.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A steel bar is fully restrained at both ends and its temperature is raised by 50°C. With α = 12 × 10⁻⁶ per °C and E = 200 GPa, the thermal stress induced is:
सही उत्तर: घ) 120 MPa
Thermal stress σ = αΔT·E = 12 × 10⁻⁶ × 50 × 200,000 MPa = 120 MPa (compressive).
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The relationship between Young's modulus E, bulk modulus K and Poisson's ratio μ of an isotropic material is:
सही उत्तर: ग) E = 3K(1 − 2μ)
For an isotropic elastic material the elastic constants are related by E = 3K(1 − 2μ).
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A shaft rotating at 300 rpm transmits a torque of 1,000 N·m. The power transmitted is approximately:
सही उत्तर: ख) 31.4 kW
P = 2πNT/60 = 2π × 300 × 1000 / 60 ≈ 31,416 W ≈ 31.4 kW.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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