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 total solid angle subtended at a point by the whole of the surrounding space is:
सही उत्तर: क) 4π steradian
The area of a sphere is 4πr², so the full solid angle is 4πr²/r² = 4π sr.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The SI unit of solid angle is the:
सही उत्तर: ग) steradian
Solid angle is measured in steradians (sr); one lumen is the flux emitted by 1 cd into 1 sr.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Before starting work on an electrical circuit, the correct safe procedure is to:
सही उत्तर: घ) isolate the supply, lock it off and test to confirm the circuit is dead
Safe isolation means disconnecting the supply, securing it against re-energising and verifying absence of voltage with a proven tester.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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For an MCB to disconnect an earth fault quickly, the earth fault loop impedance must be:
सही उत्तर: ख) low enough that the fault current exceeds the MCB's instantaneous trip current
Fault current = U₀/Z_s; a low loop impedance gives a large current that trips the MCB magnetically within the required time.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A practical advantage of a miniature circuit breaker (MCB) over a rewirable fuse is that the MCB:
सही उत्तर: क) can simply be reset after it trips
After clearing the fault, an MCB is switched back on, whereas a blown fuse must be rewired or replaced.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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In an IP rating such as IP54, the first digit indicates the degree of protection against:
सही उत्तर: ख) entry of solid objects and dust
The first digit (0–6) grades protection against solid foreign objects and dust; the second digit (0–8/9) grades protection against water.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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According to the IEC (harmonised) colour code for flexible cables, the live (phase) conductor is coloured:
सही उत्तर: ग) brown
Under the IEC code, live is brown, neutral is blue and protective earth is green/yellow.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The illuminance at a workplace is measured with a:
सही उत्तर: क) lux meter
A lux meter uses a photocell calibrated to read illuminance in lux (lm/m²).
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A thin mirror strip is provided beside the scale of many analogue meters in order to:
सही उत्तर: घ) avoid parallax error while reading
The reading is taken when the pointer hides its own reflection, so the eye is exactly above the pointer and parallax is avoided.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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For measuring resistances in the medium range (about 1 Ω to 100 kΩ) accurately, the instrument generally used is the:
सही उत्तर: ग) Wheatstone bridge
The Wheatstone bridge suits medium resistances; the Kelvin double bridge is used for very low ones and the megger for insulation (very high) resistance.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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