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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Two lamps rated 60 W, 230 V and 100 W, 230 V are connected in parallel across a 230 V supply. Which lamp glows brighter?
सही उत्तर: घ) The 100 W lamp
In parallel each lamp receives its rated 230 V and so dissipates its rated power; the 100 W lamp gives more light.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A 10 V supply feeds two 10 kilo-ohm resistors in series. A 10 kilo-ohm load is connected across the lower resistor. The voltage across the load is about:
सही उत्तर: क) 3.33 V
The lower resistor in parallel with the load is 5 kilo-ohm, so V = 10 x 5 / (10 + 5), about 3.33 V; loading reduces the divider output.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A 10 ohm and a 40 ohm resistor are connected in parallel. The equivalent resistance is:
सही उत्तर: घ) 8 ohm
R = (10 x 40) / (10 + 40) = 400 / 50 = 8 ohm.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Four equal resistors are first connected in series and then in parallel. The ratio of the series resistance to the parallel resistance is:
सही उत्तर: घ) 16
Series gives 4R and parallel gives R/4, so the ratio is 4R / (R/4) = 16 (in general n^2).
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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What is the highest voltage that can be applied across a 1 kilo-ohm resistor rated 0.25 W without exceeding its power rating?
सही उत्तर: ख) About 15.8 V
P = V^2 / R, so V = sqrt(P x R) = sqrt(0.25 x 1000) = sqrt(250), about 15.8 V.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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In the resistor colour code, a silver tolerance band indicates a tolerance of:
सही उत्तर: ख) +/- 10%
Gold indicates +/- 5%, silver +/- 10%, and no fourth band traditionally +/- 20%.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A resistor has colour bands yellow, violet, brown and gold. Its value is:
सही उत्तर: ग) 470 ohm +/- 5%
Yellow = 4, violet = 7, brown multiplier = x10, so 47 x 10 = 470 ohm; gold tolerance = +/- 5%.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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On a graph of current (vertical axis) against voltage (horizontal axis) for an ohmic resistor, the slope of the line equals:
सही उत्तर: घ) the conductance 1/R
Slope = I / V = 1 / R, which is the conductance in siemens.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The V-I characteristic of an ohmic resistor at constant temperature is:
सही उत्तर: ग) a straight line passing through the origin
For an ohmic conductor V is directly proportional to I, giving a straight line through the origin.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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If the diameter of a wire is halved while its length and material stay the same, its resistance becomes:
सही उत्तर: क) 4 times the original
Area is proportional to d^2, so halving d makes the area one quarter and R = rho l / A four times larger.
💬 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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