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 current in a conductor rises as i = 2t ampere. The charge that passes in the first 3 seconds is:
सही उत्तर: ख) 9 C
q = ∫ i dt from 0 to 3 = [t²] from 0 to 3 = 9 C.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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If 5 x 10^18 electrons pass a cross-section of a wire every second, the current is (e = 1.6 x 10^-19 C):
सही उत्तर: ग) 0.8 A
I = ne/t = 5 x 10^18 × 1.6 x 10^-19 = 0.8 A.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Lamps of 40 W and 60 W are connected in parallel to a 230 V supply. The total current drawn is about:
सही उत्तर: घ) 0.43 A
Total power 100 W, so I = 100/230 ≈ 0.43 A.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Two branches of conductance 0.5 S each are connected in series. The equivalent conductance is:
सही उत्तर: घ) 0.25 S
In series, resistances add: 2 + 2 = 4 ohm, so G = 0.25 S.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A copper wire of diameter 2 mm is 100 m long. Taking resistivity as 1.72 x 10^-8 ohm-m, its resistance is about:
सही उत्तर: क) 0.55 ohm
A = pi(1 x 10^-3)² = 3.14 x 10^-6 m²; R = 1.72 x 10^-8 × 100/3.14 x 10^-6 ≈ 0.55 ohm.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A 1.5 kW air conditioner runs 8 hours a day for 30 days. At Rs. 11 per unit, the monthly energy cost is:
सही उत्तर: ख) Rs. 3960
Energy = 1.5 × 8 × 30 = 360 kWh; cost = 360 × 11 = Rs. 3960.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A motor gives an output of 10 hp at an efficiency of 85%. Taking 1 hp = 746 W, its electrical input is about:
सही उत्तर: ग) 8.78 kW
Input = 7460/0.85 ≈ 8776 W ≈ 8.78 kW.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A 2 kW heater is operated for 5 minutes. The heat produced is:
सही उत्तर: ग) 600 kJ
H = P × t = 2000 × 300 = 6 x 10^5 J = 600 kJ.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Compared with its resistance when glowing normally, the cold resistance of a tungsten-filament lamp is:
सही उत्तर: घ) much lower
Tungsten has a positive temperature coefficient, so its resistance at room temperature is far lower than at its operating temperature (which is why a large inrush current flows at switch-on).
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Resistors of 2 ohm and 4 ohm are connected first in series and then in parallel across the same supply. Which statement is correct?
सही उत्तर: क) In series the 4 ohm dissipates more power; in parallel the 2 ohm does
In series the current is common, so P = I²R is larger for 4 ohm; in parallel the voltage is common, so P = V²/R is larger for 2 ohm.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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