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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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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A battery charger operated from the mains must contain a:
सही उत्तर: क) rectifier to convert AC into DC
Batteries can only be charged by DC, so the charger rectifies the AC supply.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A galvanometer is an instrument for:
सही उत्तर: क) detecting small currents
A galvanometer is a sensitive moving-coil device that detects and measures very small currents.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A current-carrying solenoid behaves like:
सही उत्तर: ख) a bar magnet
Its field outside resembles that of a bar magnet, with N and S poles at its ends.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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An electric bell operates on the principle of:
सही उत्तर: ग) the magnetic effect of electric current (electromagnet)
The electromagnet attracts the armature to strike the gong and breaks its own circuit, giving repeated strokes.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Insulators for overhead lines are most commonly made of:
सही उत्तर: घ) porcelain or toughened glass
Porcelain and glass have high mechanical strength, dielectric strength and weather resistance.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Mica is widely used as insulation in electric irons and between commutator segments because it:
सही उत्तर: घ) withstands high temperature and has high dielectric strength
Mica keeps its insulating properties at high temperature and resists electrical breakdown.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The MCBs that protect the different circuits of a house are housed in the:
सही उत्तर: क) distribution board
The distribution board receives the supply from the main switch and distributes it to circuits through MCBs or fuses.
💬 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।
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