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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In an induction-type energy meter, the braking torque that makes the disc speed proportional to power is produced by:
सही उत्तर: ग) a permanent magnet inducing eddy currents in the disc
The braking magnet's eddy-current torque is proportional to disc speed, so the steady speed is proportional to the driving torque, i.e. power.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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In a wattmeter, the pressure (potential) coil is connected:
सही उत्तर: ग) across (in parallel with) the load
The current coil carries the load current (series) while the pressure coil senses the load voltage (parallel).
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Compared with a PMMC instrument, the scale of a moving-iron instrument is:
सही उत्तर: घ) non-uniform, cramped at the lower end
The deflecting torque of a moving-iron instrument is roughly proportional to I², so the scale is crowded at the beginning.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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By Blondel's theorem, the minimum number of wattmeters needed to measure the total power of an n-wire polyphase system is:
सही उत्तर: क) n − 1
One of the n wires can be taken as the common return for the pressure coils, so n − 1 wattmeters suffice (2 for 3-wire, 3 for 4-wire).
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A platinum resistance thermometer measures temperature using:
सही उत्तर: ख) the increase in resistance of platinum with temperature
Platinum has a stable, nearly linear positive temperature coefficient of resistance.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A strain gauge works on the principle that:
सही उत्तर: ख) the resistance of a wire changes when it is stretched or compressed
Stretching increases length and decreases area, so the gauge's resistance changes in proportion to strain.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A dynamo (generator) converts:
सही उत्तर: ग) mechanical energy into electrical energy
A generator uses electromagnetic induction in conductors moved by a prime mover to convert mechanical energy into electrical energy.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The SI unit of electric flux is:
सही उत्तर: घ) volt metre (V·m)
Electric flux Φ = E × area has units (V/m)(m²) = V·m, equivalently N m² C⁻¹.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A long transmission line, whose resistance, inductance and capacitance are spread along its whole length, is an example of a:
सही उत्तर: क) distributed-parameter network
In a distributed network the parameters cannot be separated into discrete elements; they are spread over the length.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Two ideal voltage sources of different emfs are not connected directly in parallel because:
सही उत्तर: क) it would violate Kirchhoff's voltage law (an infinite current would flow)
Ideal sources force different voltages across the same pair of nodes, which is impossible; with zero internal resistance the circulating current would be unlimited.
💬 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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