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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Manning's formula for mean velocity in an open channel (SI units) is:
सही उत्तर: घ) V = (1/n) R^(2/3) S^(1/2)
Manning: V = (1/n) R^(2/3) S^(1/2), where n is roughness coefficient, R hydraulic radius and S bed slope; V = C√(RS) is Chezy's formula.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The Darcy–Weisbach equation for head loss due to friction in a pipe is:
सही उत्तर: घ) hf = fLV²/(2gD)
hf = f (L/D)(V²/2g), where f is the Darcy friction factor.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Flow in a circular pipe is generally considered laminar when the Reynolds number is less than about:
सही उत्तर: ख) 2000
Pipe flow is laminar for Re below about 2000, transitional between about 2000 and 4000, and turbulent above that.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Water flows through a pipe. If the pipe diameter is halved while the discharge remains the same, the mean velocity becomes:
सही उत्तर: क) Four times
By continuity Q = AV and A ∝ d²; halving d reduces area to one quarter, so velocity becomes four times.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Bernoulli's equation in its basic form is applicable to flow that is:
सही उत्तर: ग) Steady, incompressible, non-viscous and along a streamline
The basic Bernoulli equation assumes steady, incompressible, frictionless flow along a streamline with no energy added or removed.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The gauge pressure at a depth of 10 m below the free surface of still water (ρ = 1000 kg/m³, g = 9.81 m/s²) is about:
सही उत्तर: क) 98.1 kPa
p = ρgh = 1000 × 9.81 × 10 = 98,100 Pa ≈ 98.1 kPa.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A sand has specific gravity of solids 2.65 and void ratio 0.65. What is the critical hydraulic gradient for a quick (boiling) condition?
सही उत्तर: घ) 1.00
ic = (G − 1)/(1 + e) = 1.65/1.65 = 1.00.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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In Terzaghi's one-dimensional consolidation theory, the time factor Tv is expressed as:
सही उत्तर: क) cv·t / d²
Tv = cv t / d², where cv is coefficient of consolidation and d is the drainage path length.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The standard Proctor compaction test establishes the relationship between:
सही उत्तर: ख) Dry density and moisture content
The Proctor test gives the compaction curve from which maximum dry density and optimum moisture content are obtained.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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For a cohesionless backfill with angle of internal friction φ = 30°, the Rankine coefficient of active earth pressure Ka is:
सही उत्तर: क) 1/3
Ka = (1 − sin φ)/(1 + sin φ) = (1 − 0.5)/(1 + 0.5) = 1/3; Kp would be 3.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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