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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Two resistors take a total of 20 W when connected in series across 10 V, and 125 W when connected in parallel across the same 10 V. Their values are:
सही उत्तर: ग) 1 Ω and 4 Ω
Series: R₁ + R₂ = 10²/20 = 5 Ω. Parallel: R₁R₂/(R₁ + R₂) = 10²/125 = 0.8 Ω, so R₁R₂ = 4. Hence R₁ = 1 Ω and R₂ = 4 Ω.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Resistors of 2 Ω, 4 Ω and 6 Ω are connected in parallel across a DC supply. Which resistor dissipates the most power?
सही उत्तर: ख) the 2 Ω resistor
In parallel the voltage V is the same, so P = V²/R is greatest for the smallest resistance, 2 Ω.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Resistors of 2 Ω, 4 Ω and 6 Ω are connected in series across a DC supply. Which resistor dissipates the most power?
सही उत्तर: क) the 6 Ω resistor
In series the current I is the same, so P = I²R is greatest for the largest resistance, 6 Ω.
💬 टिप्पणी / गल्ती रिपोर्ट (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)
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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