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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As the temperature of a crystalline silicon solar cell rises, its:
सही उत्तर: ख) open-circuit voltage decreases, reducing its power output
The cell voltage falls by roughly 2 mV/°C per cell as temperature rises, so hot panels produce less power.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Four identical solar panels, each rated 18 V and 5 A at maximum power, are connected in series. The array delivers at maximum power about:
सही उत्तर: क) 72 V at 5 A
In series the voltages add (4 × 18 = 72 V) while the current stays the same (5 A); the array gives 360 W.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A fuel cell produces electricity by:
सही उत्तर: ग) converting the chemical energy of a fuel such as hydrogen directly into electrical energy
In a fuel cell, hydrogen and oxygen react electrochemically to give electricity directly (with water as the by-product), without combustion.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Among lead-acid, nickel-cadmium, nickel-metal hydride and lithium-ion cells, the one with the highest energy per unit mass is:
सही उत्तर: घ) lithium-ion
Lithium-ion cells have a much higher specific energy (roughly 100–250 Wh/kg) than the other types, which is why they are used in phones and electric vehicles.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The usable ampere-hour capacity of a lead-acid battery becomes smaller when it is discharged at a higher current. This is described by:
सही उत्तर: ख) Peukert's law
Peukert's law expresses that the effective capacity of a battery decreases as the rate of discharge increases.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A PTC (positive temperature coefficient) thermistor used as a resettable fuse protects a circuit because its resistance:
सही उत्तर: घ) rises sharply when overcurrent heats it
Overcurrent heats the PTC device past its switching temperature, its resistance jumps to a high value and limits the current; it resets on cooling.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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In an ACSR (Aluminium Conductor Steel Reinforced) overhead conductor, the steel core mainly provides:
सही उत्तर: क) mechanical (tensile) strength
The aluminium strands carry the current while the galvanised steel core gives the high tensile strength needed for long spans.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Bakelite is widely used for switch covers, lamp holders and plug tops because it is:
सही उत्तर: ग) a hard thermosetting insulating plastic
Bakelite is a heat-resistant thermosetting plastic with good insulating and mechanical properties.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Common electronic solder used for joining wires and components is mainly an alloy of:
सही उत्तर: क) tin and lead (or tin with silver/copper in lead-free types)
Soft solder is a low-melting tin–lead alloy; modern lead-free solders are mostly tin with small amounts of silver and copper.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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In the Standard Wire Gauge (SWG) system, a larger gauge number means a wire that is:
सही उत्तर: ग) thinner
SWG numbers increase as the diameter decreases, e.g. 14 SWG is thicker than 22 SWG.
💬 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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