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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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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In a conventional fluorescent tube circuit, the glow starter:
सही उत्तर: क) Closes and then opens the filament circuit so that the choke produces a high-voltage kick
When the starter opens, the sudden interruption of current through the choke induces a high voltage that strikes the tube.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Low-pressure sodium vapour lamps used for street lighting give light that is:
सही उत्तर: ख) Nearly monochromatic yellow
They emit almost entirely the sodium D-lines near 589 nm, so colours are hard to distinguish under them.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The colour temperature of a light source, describing whether its light looks warm or cool, is expressed in:
सही उत्तर: घ) Kelvin
Warm white lamps are around 2700-3000 K, cool daylight lamps around 6500 K.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Which of the following is one of the seven SI base units?
सही उत्तर: क) Candela
The SI base units are metre, kilogram, second, ampere, kelvin, mole and candela; lumen, lux and watt are derived units.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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In a Leclanché (zinc-carbon) cell, manganese dioxide is used as the:
सही उत्तर: ग) Depolariser
Manganese dioxide removes hydrogen collecting at the carbon electrode, reducing polarisation.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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In a zinc-carbon cell, the wasteful eating away of zinc by impurities, even when no current is drawn, is called:
सही उत्तर: ग) Local action
Impurities in the zinc form tiny local cells that corrode the zinc; amalgamating the zinc reduces it.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Near the end of charging, a lead-acid cell gives off bubbles of hydrogen and oxygen. This is known as:
सही उत्तर: क) Gassing
Once most active material is converted, the charging current electrolyses water in the electrolyte, releasing gases.
💬 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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