आधारभूत विद्युत् (Basic Electrical) – Basic Electrical Engineering MCQ
आधारभूत विद्युत् (Basic Electrical) – इलेक्ट्रिकल र टेलिकम
Basic Electrical Engineering · Technical – Electrical, Mechanical & Telecom · २,२९९ प्रश्न
२,२९९ प्रश्न उपलब्ध। मोड छान्नुहोस्:
आधारभूत विद्युत् (Basic Electrical): 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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A copper busbar is 2 m long with a rectangular cross-section of 10 mm × 5 mm. Taking ρ = 1.72 × 10⁻⁸ Ω·m, its resistance is about:
सही उत्तर: घ) 0.69 mΩ
R = ρL/A = 1.72 × 10⁻⁸ × 2/(50 × 10⁻⁶) = 6.88 × 10⁻⁴ Ω ≈ 0.69 mΩ.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Compared with a single-busbar scheme, a double-busbar arrangement in a substation:
सही उत्तर: ग) allows a busbar to be maintained or repaired without interrupting the supply
Circuits can be transferred to the other busbar, giving flexibility and continuity of supply at extra cost.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A light-emitting diode (LED) gives out light when it is:
सही उत्तर: घ) forward biased
Under forward bias electrons and holes recombine at the junction and release energy as photons.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The overhead earth wire (shield wire) run along the tops of transmission towers protects the line mainly against:
सही उत्तर: ख) direct lightning strokes on the phase conductors
The earthed wire above the phase conductors intercepts lightning strokes and conducts them to earth through the towers.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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At a hydropower station, the generator voltage (for example 11 kV) is raised to a much higher value for long-distance transmission by:
सही उत्तर: क) a step-up transformer in the switchyard
Raising the voltage reduces the current and hence the I²R losses on the transmission line.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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In a substation, a busbar is:
सही उत्तर: घ) a conductor (bar) to which several incoming and outgoing circuits are connected
Busbars collect power from incoming feeders and distribute it to outgoing feeders through switchgear.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Under a net-metering arrangement for a rooftop solar system, the consumer:
सही उत्तर: ख) is billed only for the difference between energy imported from and exported to the grid
A bidirectional meter records import and export, and the consumer pays for the net energy drawn.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The MPPT feature of a solar charge controller or inverter:
सही उत्तर: क) continuously adjusts the operating point so that the panel delivers its maximum power
Maximum power point tracking varies the load seen by the panel to keep it at the knee of its I–V curve as irradiance and temperature change.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A solar cell has an open-circuit voltage of 0.6 V, a short-circuit current of 3 A and a maximum power of 1.35 W. Its fill factor is:
सही उत्तर: क) 0.75
Fill factor = P_max/(V_oc × I_sc) = 1.35/(0.6 × 3) = 0.75.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The open-circuit voltage of a single crystalline silicon solar cell in sunlight is about:
सही उत्तर: ग) 0.6 V
A silicon cell gives about 0.5–0.6 V open circuit, so many cells are connected in series in a panel (e.g. 36 cells for a nominal 12 V module).
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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