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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An insulation resistance tester (megger) for low-voltage installations typically applies a test voltage of:
सही उत्तर: घ) 500 V or 1000 V DC
A high DC test voltage is needed to measure the very high resistance (megohms) of insulation.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Gold plating is used on connector pins and switch contacts mainly because gold:
सही उत्तर: क) Resists corrosion and oxidation, keeping contact resistance low
Gold does not tarnish, so the contact surface stays clean and reliable; silver is actually the best conductor.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The SI unit of electrical conductivity (the reciprocal of resistivity) is:
सही उत्तर: ग) Siemens per metre
Resistivity is in ohm-metre, so its reciprocal, conductivity, is in S/m.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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One henry is equal to one:
सही उत्तर: ग) Weber per ampere
L = N phi / I, so inductance is flux linkage per ampere (Wb/A); coulomb per volt is the farad.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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One weber is equal to one:
सही उत्तर: क) Volt-second
From Faraday's law, e = d(phi)/dt, so flux has units of volt x second; an ohm-second is a henry.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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With alternating current, current tends to crowd towards the outer surface of a conductor, increasing its effective resistance. This is called:
सही उत्तर: ख) Skin effect
Skin effect becomes stronger at higher frequency and for larger conductor diameters.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The absorption or release of heat when a current flows through a single conductor that has a temperature gradient along it is called the:
सही उत्तर: घ) Thomson effect
The Thomson effect occurs within one conductor; the Peltier effect occurs at a junction of two different conductors.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Steel scrap is commonly melted in which type of electric furnace?
सही उत्तर: घ) Direct arc furnace
Arc furnaces strike arcs between graphite electrodes and the charge, reaching temperatures high enough to melt steel.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Non-conducting materials such as wood, plastics and glue joints are heated uniformly throughout by:
सही उत्तर: ख) Dielectric (high-frequency capacitive) heating
In dielectric heating, a high-frequency electric field causes losses inside the insulating material itself.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A room of 50 m^2 needs an illuminance of 200 lux. With a utilisation factor of 0.5 and maintenance factor of 0.8, how many 2500-lumen lamps are needed?
सही उत्तर: ग) 10
N = E x A / (lumens x UF x MF) = 200 x 50 / (2500 x 0.5 x 0.8) = 10000 / 1000 = 10.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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