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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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)
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Leaving a lead-acid battery discharged for a long time lets hard lead sulphate crystals build up on its plates. This fault is called:
सही उत्तर: ख) Sulphation
Hard sulphate is difficult to convert back during charging, reducing the battery's capacity.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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For a storage battery, the ampere-hour efficiency is usually:
सही उत्तर: घ) Higher than its watt-hour efficiency
Watt-hour efficiency also accounts for the battery discharging at a lower voltage than it is charged at, so it is lower.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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How many lead-acid cells are connected in series in a nominal 12 V car battery?
सही उत्तर: घ) 6
Each lead-acid cell gives about 2 V, so six in series give 12 V.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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