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 resistor is marked 1 kΩ with a tolerance of ±5%. Its actual resistance may lie anywhere between:
सही उत्तर: ख) 950 Ω and 1050 Ω
5% of 1000 Ω is 50 Ω, so the value can lie from 1000 − 50 to 1000 + 50 Ω.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A 4 µF capacitor carries a charge of 200 µC. The energy stored in it is:
सही उत्तर: ग) 5 mJ
W = Q²/(2C) = (200 × 10⁻⁶)²/(2 × 4 × 10⁻⁶) = 5 × 10⁻³ J.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Ten cells, each of emf 1.5 V, are meant to be connected in series, but one cell is accidentally connected the wrong way round. The net emf is:
सही उत्तर: घ) 12 V
The reversed cell not only stops adding 1.5 V but subtracts 1.5 V: 9 × 1.5 − 1.5 = 12 V.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Three identical resistors are connected so that one is in series with a parallel pair of the other two. If the series resistor dissipates 20 W, each resistor of the parallel pair dissipates:
सही उत्तर: क) 5 W
The full current I flows in the series resistor and I/2 in each parallel one; since P = I²R, each parallel resistor dissipates 20/4 = 5 W.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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If the voltage across a capacitor is doubled, the energy stored in it becomes:
सही उत्तर: घ) Four times
E = (1/2) C V^2, so doubling V multiplies the energy by 4.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The power factor of an ordinary incandescent filament lamp is approximately:
सही उत्तर: ख) 1 (unity)
A filament lamp is a practically pure resistive load, so voltage and current are in phase.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Since the 2019 redefinition of the SI units, the ampere is defined by fixing the numerical value of the:
सही उत्तर: ग) Elementary charge e
The ampere is now based on e = 1.602176634 x 10^-19 C exactly; the old definition used the force between parallel conductors.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Which instrument is used to check whether a three-phase supply has the correct phase sequence (R-Y-B)?
सही उत्तर: क) Phase sequence indicator
A phase sequence indicator, often a small rotating disc or lamp type, shows the order in which the phases reach their peaks.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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As the length of a cable increases, its insulation resistance:
सही उत्तर: ख) Decreases
Leakage paths through the insulation act in parallel along the length, so insulation resistance is inversely proportional to length.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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An ammeter connected through a 200/5 A current transformer reads 3 A. The primary (line) current is:
सही उत्तर: घ) 120 A
CT ratio = 200/5 = 40, so primary current = 3 x 40 = 120 A.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
यी अभ्यास प्रश्न हुन्, आधिकारिक प्रश्न होइनन्। पाठ्यक्रम, विज्ञापन र नतिजाका लागि सम्बन्धित निकायको आधिकारिक वेबसाइट हेर्नुहोस्। उत्तरमा गल्ती भेटे प्रश्नमुनिको "टिप्पणी / गल्ती रिपोर्ट" मा लेख्नुहोस्।
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