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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The 'memory effect', in which a battery seems to lose capacity if repeatedly recharged after only partial discharge, is mainly associated with:
सही उत्तर: क) nickel–cadmium cells
Ni-Cd cells show a memory effect; lithium-ion cells are practically free of it.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The mass of hydrogen liberated by passing 96500 coulombs through acidified water is about:
सही उत्तर: ख) 1 g
One faraday liberates one gram-equivalent; for hydrogen (atomic mass 1, valency 1) that is about 1 g.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Cathodic protection of buried steel pipelines works by:
सही उत्तर: ग) making the pipeline the cathode so that it does not corrode
A sacrificial anode or impressed current makes the pipe cathodic, so the anode corrodes instead.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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In the electrolytic refining of copper:
सही उत्तर: ग) impure copper is made the anode and pure copper is deposited on the cathode
Copper dissolves from the impure anode and is plated as pure copper on the cathode; impurities fall as anode mud.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Spot welding of sheet metal is a type of:
सही उत्तर: घ) resistance welding
Heat is produced by the resistance of the joint when a large current passes between two electrodes pressing the sheets.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Electric arc welding is usually done with a supply of:
सही उत्तर: क) low voltage and high current
A welding set gives about 20–80 V with currents of tens to hundreds of amperes to sustain the arc.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Domestic microwave ovens operate at a frequency of about:
सही उत्तर: ख) 2.45 GHz
Microwave ovens use about 2.45 GHz, which is absorbed well by water molecules in food.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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In induction heating, increasing the supply frequency causes the heating to be:
सही उत्तर: ख) concentrated in a thinner surface layer
The depth of current penetration (skin depth) decreases with frequency, so high frequencies are used for surface hardening.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The stroboscopic effect of discharge lamps on AC supply can make:
सही उत्तर: ग) rotating machinery appear stationary or slowly moving
The light output pulsates at twice the supply frequency; a rotating part moving in step appears frozen, which is dangerous.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The tungsten-halogen lamp gives a longer life than an ordinary filament lamp because:
सही उत्तर: घ) evaporated tungsten combines with the halogen and is redeposited on the filament
The halogen cycle returns tungsten to the filament and keeps the bulb from blackening.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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