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 steady current of 0.5 A flows for 2 hours. The charge that passes is:
सही उत्तर: क) 3600 C
Q = It = 0.5 × 7200 s = 3600 C.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A coil of inductance 0.1 H and resistance 10 ohm is connected in parallel with a 10 microfarad capacitor. The dynamic impedance of this tank circuit at resonance is:
सही उत्तर: ख) 1000 ohm
Z_D = L/(CR) = 0.1/(10 x 10^-6 × 10) = 1000 ohm.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A voltage v = 200 sin(314t) V is applied to a coil with R = 10 ohm and X_L = 10 ohm. The average power consumed is about:
सही उत्तर: ग) 1000 W
V_rms = 141.4 V, Z = 14.14 ohm, I_rms = 10 A, so P = I²R = 100 × 10 = 1000 W.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A 1 kW, 230 V heater element is to be wound from nichrome wire of resistivity 1.1 x 10^-6 ohm-m and cross-section 0.2 mm². The length of wire needed is about:
सही उत्तर: घ) 9.6 m
R = V²/P = 52.9 ohm; L = RA/rho = 52.9 × 0.2 x 10^-6/1.1 x 10^-6 ≈ 9.6 m.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A conductor has a temperature coefficient of resistance of 0.004 per °C referred to 0 °C. Its temperature coefficient referred to 50 °C is about:
सही उत्तर: क) 0.00333 per °C
alpha(50) = alpha(0)/(1 + alpha(0) × 50) = 0.004/1.2 ≈ 0.00333 per °C.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A 10 V source with 2 ohm series resistance and a 5 V source with 4 ohm series resistance both connect to a node A, which is joined to ground through 4 ohm. The voltage of node A is:
सही उत्तर: क) 6.25 V
KCL at A: (V − 10)/2 + V/4 + (V − 5)/4 = 0 gives 4V = 25, so V = 6.25 V.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The angular frequency of a 50 Hz supply is about:
सही उत्तर: ख) 314 rad/s
omega = 2 pi f = 2 × 3.1416 × 50 ≈ 314 rad/s.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Two 100 ohm resistors are connected in parallel, and the pair is connected in series with a 50 ohm resistor. The total resistance is:
सही उत्तर: ग) 100 ohm
100 parallel 100 = 50 ohm; 50 + 50 = 100 ohm.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A purely resistive load draws 5 A from a 230 V AC supply. The power it consumes is:
सही उत्तर: घ) 1150 W
For a resistive load the power factor is 1, so P = VI = 230 × 5 = 1150 W.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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An alternating voltage has a time period of 16.67 ms. Its frequency is about:
सही उत्तर: घ) 60 Hz
f = 1/T = 1/0.01667 ≈ 60 Hz.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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