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 motor delivering 7.46 kW of mechanical output has a rating of about (1 hp = 746 W):
सही उत्तर: घ) 10 hp
7460/746 = 10 hp.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A lift motor raises 500 kg through 20 m in 25 s with an overall efficiency of 80%. Its electrical input power is about (g = 9.81 m/s²):
सही उत्तर: क) 4.9 kW
Output = 500 × 9.81 × 20/25 = 3924 W; input = 3924/0.8 ≈ 4905 W.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Two 1 kW, 220 V heaters are connected in series across a 220 V supply. Assuming constant resistance, the total power is:
सही उत्तर: ग) 500 W
Each heater has R = 220²/1000 = 48.4 ohm; in series 96.8 ohm, so P = 220²/96.8 = 500 W.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A 1.5 kW kettle heats 1.5 kg of water from 25 °C to 100 °C in 6 minutes (c = 4200 J/kg °C). Its efficiency is:
सही उत्तर: घ) 87.5%
Useful heat = 1.5 × 4200 × 75 = 472.5 kJ; energy input = 1500 × 360 = 540 kJ; efficiency = 472.5/540 = 87.5%.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A household uses five 10 W LED lamps for 6 hours, a 150 W refrigerator for 24 hours and a 1 kW water pump for 1 hour every day. The energy used in a 30-day month is:
सही उत्तर: ग) 147 units
Daily: 0.3 + 3.6 + 1.0 = 4.9 kWh; monthly: 4.9 × 30 = 147 kWh.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A 1150 W heater works on a 230 V supply. The current it draws is:
सही उत्तर: ख) 5 A
I = P/V = 1150/230 = 5 A.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A 10 V source with 5 ohm series resistance and a 2 A current source both feed a 5 ohm load connected between their common node and ground. Using superposition, the load current is:
सही उत्तर: क) 2 A
Voltage source alone: 10/10 = 1 A; current source alone: 2 A divides equally between the two 5 ohm paths, giving 1 A; total 2 A.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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In a balanced Wheatstone bridge, the ratio arms are P = 100 ohm and Q = 10 ohm, and the variable arm R reads 47 ohm. The unknown resistance S is:
सही उत्तर: ग) 4.7 ohm
P/Q = R/S gives S = R × Q/P = 47 × 10/100 = 4.7 ohm.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Resistors of 10 ohm, 10 ohm and 5 ohm are connected in parallel. The equivalent resistance is:
सही उत्तर: घ) 2.5 ohm
1/R = 1/10 + 1/10 + 1/5 = 0.4, so R = 2.5 ohm.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Twelve cells, each of emf 1.5 V and internal resistance 0.5 ohm, are arranged in 3 parallel rows of 4 cells in series. The emf and internal resistance of the battery are:
सही उत्तर: क) 6 V and 0.67 ohm
Each row: 4 × 1.5 = 6 V and 4 × 0.5 = 2 ohm; three rows in parallel keep 6 V and give 2/3 ≈ 0.67 ohm.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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