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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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)
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A simple lifting machine is self-locking (non-reversible), so the load does not run back when the effort is removed, if its efficiency is:
सही उत्तर: क) Less than 50%
A machine is reversible only if its efficiency exceeds 50%; a machine with efficiency below 50% is self-locking.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A lifting machine has a mechanical advantage of 40 and a velocity ratio of 50. Its efficiency is:
सही उत्तर: ख) 80%
Efficiency = MA/VR = 40/50 = 0.8, i.e. 80%.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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For a perfectly plastic (perfectly inelastic) impact between two bodies, the coefficient of restitution is:
सही उत्तर: ख) 0
In a perfectly plastic impact the bodies move together after impact, so the relative velocity of separation is zero and e = 0; e = 1 is a perfectly elastic impact.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The centroid of a triangular area of height h is located at what distance from its base?
सही उत्तर: ग) h/3
The centroid lies at the intersection of the medians, which is one-third of the height above the base (two-thirds from the apex).
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The centroid of a semicircular area of radius r lies on its axis of symmetry at what distance from the diameter?
सही उत्तर: घ) 4r/(3π)
For a semicircular lamina, ȳ = 4r/(3π) ≈ 0.424r from the straight edge; 2r/π applies to a semicircular arc (wire), not an area.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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