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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Compared with an ordinary inverter, an online UPS is preferred for computers mainly because:
सही उत्तर: ग) it supplies the load with practically no changeover interruption
In an online UPS the load is always fed from the inverter, so a mains failure causes no break in supply.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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In the term VRLA battery, 'VR' stands for:
सही उत्तर: घ) valve regulated
VRLA means valve-regulated lead–acid: a sealed, maintenance-free battery with a pressure relief valve.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Trickle charging of a storage battery means:
सही उत्तर: घ) charging continuously at a very small current to make up for self-discharge
A small continuous current keeps a standby battery fully charged by compensating its internal losses.
💬 टिप्पणी / गल्ती रिपोर्ट (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)
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।
नमस्ते! पाठ्यक्रम, सामान्य ज्ञान, भाषा परीक्षा वा कुनै प्रश्नको उत्तर बुझ्न सोध्नुहोस्।
AI ले गल्ती गर्न सक्छ। महत्वपूर्ण कुरा आधिकारिक स्रोतमा जाँच्नुहोस्।