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 same current is passed through silver and copper voltameters in series. If 10.8 g of silver (chemical equivalent 108) is deposited, the copper (chemical equivalent 31.75) deposited is about:
सही उत्तर: घ) 3.18 g
By Faraday's second law, masses are proportional to chemical equivalents: 10.8 × 31.75/108 ≈ 3.18 g.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Copper (electrochemical equivalent 0.329 mg/C) is deposited by a current of 10 A flowing for 1 hour. The mass deposited is about:
सही उत्तर: ख) 11.8 g
m = zIt = 0.329 × 10⁻³ g/C × 10 A × 3600 s ≈ 11.8 g.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A wattmeter has a voltage range of 300 V, a current range of 5 A and a scale of 150 divisions. Its multiplying factor (watts per division) is:
सही उत्तर: घ) 10 W/div
Full-scale power = 300 × 5 = 1500 W over 150 divisions, i.e. 10 W per division.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A 0–200 V voltmeter has an accuracy of ±2% of full scale. When it reads 50 V, the possible error expressed as a percentage of the reading is:
सही उत्तर: क) ±8%
The absolute error is ±2% × 200 = ±4 V, which is ±4/50 = ±8% of a 50 V reading.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A voltmeter of range 0–10 V has a resistance of 1 kΩ. The series resistance needed to extend its range to 0–100 V is:
सही उत्तर: ग) 9 kΩ
Multiplier m = 100/10 = 10, so R_s = (m − 1)R_m = 9 × 1 kΩ = 9 kΩ.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A moving-coil meter has a full-scale deflection current of 50 μA. When used as a voltmeter, its sensitivity is:
सही उत्तर: घ) 20 kΩ/V
Sensitivity = 1/I_fsd = 1/(50 × 10⁻⁶) = 20000 Ω/V.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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An auto-transformer has a voltage ratio (low/high) of k = 0.8. Compared with a two-winding transformer of the same rating, the fraction of copper saved is:
सही उत्तर: ग) 80%
Saving = k × (copper of two-winding transformer) = 0.8, i.e. 80%.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A 220 V DC shunt motor takes 52 A from the supply. Its field resistance is 110 Ω and armature resistance 0.2 Ω. The back emf is:
सही उत्तर: ख) 210 V
I_f = 220/110 = 2 A, so I_a = 50 A and E_b = 220 − 50 × 0.2 = 210 V.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A motor delivers 10 kW at 1000 rpm. The torque at its shaft is about:
सही उत्तर: क) 95.5 N m
T = P/ω = 10000/(2π × 1000/60) ≈ 95.5 N m.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A 50 Hz induction motor runs with a slip of 4%. The frequency of the rotor currents is:
सही उत्तर: ग) 2 Hz
Rotor frequency f_r = s f = 0.04 × 50 = 2 Hz.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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