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 three-phase motor takes 20 A from a 400 V supply and the input power is 11 kW. Its power factor is about:
सही उत्तर: क) 0.79
cos φ = P/(√3 V_L I_L) = 11000/(1.732 × 400 × 20) ≈ 0.79.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Two 2 μF capacitors, each charged to 100 V, are connected in parallel with the positive plate of one joined to the negative plate of the other. The energy lost in the process is:
सही उत्तर: घ) 20 mJ
The charges cancel, so the final voltage is 0; all the initial energy 2 × ½ × 2 × 10⁻⁶ × 100² = 20 mJ is lost.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A coil draws 2 A at a power factor of 0.6 lagging from a 200 V, 50 Hz supply. Its inductance is about:
सही उत्तर: ग) 0.25 H
Z = 100 ohm, R = Z cos φ = 60 ohm, X_L = √(100² − 60²) = 80 ohm, so L = 80/(2π × 50) ≈ 0.25 H.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A Wheatstone bridge has P = 10 ohm, Q = 10 ohm, R = 10 ohm and S = 15 ohm, with a 10 V supply across it. Using Thevenin's theorem, the current through a 9 ohm galvanometer connected between the two mid-points is:
सही उत्तर: ग) 50 mA
V_th = 10 × 15/25 − 10 × 10/20 = 6 − 5 = 1 V; R_th = (10 ∥ 10) + (10 ∥ 15) = 5 + 6 = 11 ohm; I = 1/(11 + 9) = 0.05 A.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A 12 V, 100 Ah battery is discharged to 80% depth of discharge supplying a 120 W DC load. The ideal running time is:
सही उत्तर: क) 8 h
Usable energy = 12 × 100 × 0.8 = 960 Wh; 960/120 = 8 h.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A load takes 10 A through a two-core cable 50 m long whose conductors each have a resistance of 0.01 ohm per metre. The voltage drop in the cable is:
सही उत्तर: घ) 10 V
Loop length = 100 m, so R = 1 ohm and the drop = 10 × 1 = 10 V.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A 3 kW, 230 V geyser is to be protected by a standard MCB. The most suitable rating is:
सही उत्तर: ख) 16 A
Full-load current = 3000/230 ≈ 13 A; the next standard rating above it is 16 A.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A 250 W solar panel receives the equivalent of 5 peak-sun hours per day. Ideally it produces about:
सही उत्तर: क) 1.25 kWh per day
250 W × 5 h = 1250 Wh = 1.25 kWh.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A 48 V, 200 Ah battery bank ideally stores:
सही उत्तर: ख) 9.6 kWh
Energy = 48 × 200 = 9600 Wh.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A lamp of 200 candela is 5 m directly above a point on the floor. The illuminance at that point is:
सही उत्तर: ग) 8 lux
E = I/d² = 200/25 = 8 lux.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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