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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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)
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Inside a metal wire carrying a steady direct current, the electric field is:
सही उत्तर: ख) non-zero and directed along the wire, equal to J/σ
Zero field applies only in electrostatic equilibrium; a steady current needs a driving field E = J/σ = ρJ along the conductor.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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In a linear network, if the only independent source is doubled in value, the current in every branch:
सही उत्तर: घ) doubles
By linearity (homogeneity), every response is proportional to the excitation, so all branch currents double.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A 5 Ω resistor is connected in series with an ideal 2 A current source. As seen by an external load, this combination is equivalent to:
सही उत्तर: घ) the 2 A current source alone
An ideal current source forces 2 A through whatever is in series with it, so the series resistor does not change the current delivered to the load and can be ignored.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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