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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A 3 ohm and a 6 ohm resistor in parallel are connected in series with a 4 ohm resistor across a 12 V supply. The current through the 3 ohm resistor is:
सही उत्तर: ख) 1.33 A
R_eq = 2 + 4 = 6 ohm, so I = 2 A; the parallel pair has 2 × 2 = 4 V across it, giving 4/3 ≈ 1.33 A in the 3 ohm resistor.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A wire is drawn out (its volume unchanged) until its diameter is halved. Its resistance becomes:
सही उत्तर: ग) 16 times the original
Halving d makes the area 1/4, so constant volume makes the length 4 times; R ∝ L/A gives 4 × 4 = 16 times.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The maximum current a 100 ohm, 0.5 W resistor can safely carry is about:
सही उत्तर: घ) 70.7 mA
I = √(P/R) = √(0.5/100) = 0.0707 A.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The conductance of a 25 ohm resistor is:
सही उत्तर: ख) 0.04 S
G = 1/R = 1/25 = 0.04 siemens.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A resistor has the bands brown, green, gold, gold. Its value is:
सही उत्तर: घ) 1.5 ohm ± 5%
Brown-green = 15; a gold third band is the multiplier 0.1, so the value is 1.5 ohm; the gold fourth band is ±5% tolerance.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A resistor is marked with the bands orange, orange, black, gold. Its value is:
सही उत्तर: क) 33 ohm ± 5%
Orange-orange = 33, black multiplier = 10⁰ = 1, gold tolerance = ±5%.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A resistor has colour bands green, blue, yellow (in that order, ignoring tolerance). Its nominal value is:
सही उत्तर: ग) 560 kilo-ohm
Green = 5, blue = 6, yellow multiplier = 10⁴: 56 × 10⁴ = 560 kilo-ohm.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A coil has a resistance of 11 ohm at 25 °C and 13 ohm at 75 °C. Assuming a linear variation, its resistance at 0 °C is:
सही उत्तर: घ) 10 ohm
The resistance rises 2 ohm per 50 °C, i.e. 1 ohm per 25 °C, so at 0 °C it is 11 − 1 = 10 ohm (α₀ = 0.004 per °C).
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Two wires of the same material have lengths in the ratio 2 : 3 and diameters in the ratio 1 : 2. The ratio of their resistances is:
सही उत्तर: ग) 8 : 3
R ∝ L/d², so R₁/R₂ = (2/3) × (2/1)² = 8/3.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A wire 50 m long with a cross-section of 0.5 mm² has a resistance of 2 ohm. The resistivity of its material is:
सही उत्तर: ख) 2 x 10^-8 ohm-m
ρ = RA/L = 2 × 0.5 × 10⁻⁶/50 = 2 × 10⁻⁸ ohm-m.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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