प्राविधिक – इलेक्ट्रिकल, मेकानिकल र टेलिकम
प्राविधिक – इलेक्ट्रिकल, मेकानिकल र टेलिकम
Technical – Electrical, Mechanical & Telecom · ४,५०० प्रश्न
४,५०० प्रश्न उपलब्ध। मोड छान्नुहोस्:
इलेक्ट्रिकल र टेलिकम: 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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Three consumers have individual maximum demands of 10 kW, 15 kW and 25 kW, while the maximum demand on the supply station is 40 kW. The diversity factor is:
सही उत्तर: क) 1.25
Diversity factor = sum of individual maximum demands/maximum demand of the system = 50/40 = 1.25.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A power station has a maximum demand of 50 MW and generates 219 GWh in a year (8760 h). Its annual load factor is:
सही उत्तर: घ) 0.5
Average load = 219 000 MWh/8760 h = 25 MW, so load factor = 25/50 = 0.5.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A consumer has a connected load of 10 kW and a maximum demand of 6 kW. The demand factor is:
सही उत्तर: घ) 0.6
Demand factor = maximum demand/connected load = 6/10 = 0.6.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A thermal (steam) power station typically converts the heat energy of its fuel into electrical energy with an overall efficiency of about:
सही उत्तर: ख) 30 to 40%
Much of the heat is rejected in the condenser (Rankine cycle limits), so conventional steam stations achieve roughly 30–40% overall efficiency.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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According to Betz's law, the maximum fraction of the wind's kinetic power that any ideal wind turbine can extract is about:
सही उत्तर: घ) 59.3%
Betz's limit is 16/27 ≈ 59.3%; the wind cannot be stopped completely, or no air would flow through the rotor.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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If the wind speed at a wind turbine doubles, the power available in the wind becomes:
सही उत्तर: ग) 8 times
Wind power is proportional to v³, so doubling v multiplies the power by 2³ = 8.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The power available in the wind passing through a turbine rotor of swept area 100 m² at 10 m/s, with air density 1.2 kg/m³ (P = ½ρAv³), is:
सही उत्तर: क) 60 kW
P = ½ × 1.2 × 100 × 10³ = 60 000 W = 60 kW.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A pumped-storage hydropower plant:
सही उत्तर: क) pumps water to an upper reservoir during off-peak hours and generates during peak hours
Pumped storage uses cheap off-peak energy to pump water up and returns it as peak-load generation, acting like a large battery.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A run-of-river hydropower plant is one that:
सही उत्तर: क) uses the natural river flow with little or no storage reservoir
Run-of-river plants divert the available flow directly, so their output follows the river discharge (high in monsoon, low in dry season).
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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In a hydropower plant, the large pipe that carries water under pressure from the forebay or surge tank down to the turbine is called the:
सही उत्तर: क) penstock
The penstock is the pressure conduit to the turbine; the tailrace carries water away after the turbine.
💬 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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