नेपाल व्यावसायिक लाइसेन्स परीक्षा
नेपाल व्यावसायिक लाइसेन्स परीक्षा
Nepal Professional License Exams · २,४१४ प्रश्न
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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In a hydropower scheme, a surge tank is provided mainly to:
सही उत्तर: ख) Reduce water hammer pressures in the conduit during sudden load changes
A surge tank absorbs pressure surges when turbine flow changes suddenly, protecting the headrace/penstock from water hammer.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A hydropower plant uses a discharge of 10 m³/s under a net head of 50 m with an overall efficiency of 90%. Its power output is about (ρ = 1000 kg/m³, g = 9.81 m/s²):
सही उत्तर: क) 4.41 MW
P = ηρgQH = 0.9 × 1000 × 9.81 × 10 × 50 ≈ 4,414,500 W ≈ 4.41 MW.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Hydraulic models of spillways, rivers and open channels, where gravity forces dominate, are designed on the basis of similarity of the:
सही उत्तर: घ) Froude number
In free-surface flows gravity and inertia dominate, so model and prototype are made to have equal Froude numbers.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Under professional ethics, when an engineer advertises his or her services, he or she should avoid:
सही उत्तर: ग) Self-laudatory or misleading claims about his or her abilities
Advertising must be factual and dignified; exaggerated or misleading claims undermine public trust in the profession.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The head loss due to a sudden enlargement in a pipe, with velocity V1 before and V2 after the enlargement, is:
सही उत्तर: ख) (V1 − V2)²/2g
Applying momentum and energy equations (Borda-Carnot), the loss at a sudden expansion is (V1 − V2)²/2g.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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For laminar flow in a circular pipe, the Darcy friction factor f is given by:
सही उत्तर: क) 64/Re
From the Hagen-Poiseuille equation, the Darcy friction factor for laminar flow is f = 64/Re (16/Re is the Fanning factor).
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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For a rectangular open channel carrying a discharge q per unit width, the critical depth yc is:
सही उत्तर: घ) (q²/g)^(1/3)
For a rectangular channel, critical flow gives yc = (q²/g)^(1/3), and the minimum specific energy is 1.5 yc.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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For an orifice, the coefficient of discharge Cd is related to the coefficient of contraction Cc and coefficient of velocity Cv by:
सही उत्तर: ग) Cd = Cc × Cv
Actual discharge = (Cc × area) × (Cv × theoretical velocity), so Cd = Cc × Cv.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The capillary rise h of water in a clean glass tube of diameter d (surface tension σ, contact angle θ, unit weight γ) is:
सही उत्तर: ख) 4σ cosθ/(γd)
Equating surface tension force πdσcosθ to the weight γ(πd²/4)h gives h = 4σcosθ/(γd).
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Kinematic viscosity of a fluid is the ratio of:
सही उत्तर: क) Dynamic viscosity to mass density
ν = μ/ρ; its SI unit is m²/s (CGS unit: stoke). Shear stress over velocity gradient gives dynamic viscosity.
💬 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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