प्राविधिक – इलेक्ट्रिकल, मेकानिकल र टेलिकम
प्राविधिक – इलेक्ट्रिकल, मेकानिकल र टेलिकम
Technical – Electrical, Mechanical & Telecom · ४,५०० प्रश्न
४,५०० प्रश्न उपलब्ध। मोड छान्नुहोस्:
इलेक्ट्रिकल र टेलिकम: 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 voltage v = 10 + 10 sqrt(2) sin(wt) volts contains a DC part and an AC part. Its RMS value is about:
सही उत्तर: ख) 14.14 V
V_rms = sqrt(DC^2 + AC_rms^2) = sqrt(10^2 + 10^2) = sqrt 200 = 14.14 V.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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In a circuit, v = 200 sin(wt) V and i = 10 sin(wt - 60 degrees) A. The average power consumed is:
सही उत्तर: घ) 500 W
P = (Vm Im / 2) cos phi = (200 x 10 / 2) x cos 60 = 1000 x 0.5 = 500 W.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A pure coil has an inductive reactance of 314 ohm at 50 Hz. Its inductance is:
सही उत्तर: क) 1 H
L = X_L / (2 pi f) = 314 / 314 = 1 H.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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An RC low-pass filter has R = 1.59 kilo-ohm and C = 1 microfarad. Its cut-off frequency 1/(2 pi R C) is about:
सही उत्तर: ग) 100 Hz
RC = 1.59 x 10^-3 s, so fc = 1 / (2 pi x 1.59 x 10^-3) = 1 / 0.01 = about 100 Hz.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A 12 V, 100 Ah battery feeds a 300 W load through an inverter of 80% efficiency. Ideally, the backup time is about:
सही उत्तर: ग) 3.2 hours
Stored energy = 12 x 100 = 1200 Wh; usable = 0.8 x 1200 = 960 Wh; time = 960 / 300 = 3.2 h.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A mobile phone battery is rated 2000 mAh at 3.7 V. The energy it stores is about:
सही उत्तर: क) 7.4 Wh
Energy = capacity x voltage = 2 Ah x 3.7 V = 7.4 Wh.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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One heater coil boils a kettle of water in 10 minutes and another boils it in 15 minutes on the same supply. If both coils are connected in parallel, the time taken is:
सही उत्तर: ख) 6 minutes
In parallel the powers add, so t = t1 t2 / (t1 + t2) = 150 / 25 = 6 minutes.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A burnt heater coil is repaired by removing one tenth of its length. At the same supply voltage, its power:
सही उत्तर: घ) Increases by about 11%
R becomes 0.9R, and P = V^2/R becomes P/0.9 = 1.11P.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Sources of 10 V and 4 V, each with 2 ohm series resistance, both feed one node that is connected to a 1 ohm load returning to the common negative. The load current is:
सही उत्तर: घ) 3.5 A
Node equation: (10 - V)/2 + (4 - V)/2 = V/1, so 7 - V = V and V = 3.5 V; load current = 3.5 V / 1 ohm = 3.5 A.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The conductor that connects the exposed metal parts of appliances and fittings back to the main earthing terminal is called the:
सही उत्तर: ख) Earth continuity (protective) conductor
The earth continuity conductor provides a low-resistance path for fault current so that protective devices operate.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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