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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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)
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Silicon and germanium are classified as:
सही उत्तर: ग) semiconductors
Their resistivity lies between that of conductors and insulators and falls as temperature rises.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Which of the following materials is a good electrical insulator?
सही उत्तर: ग) Mica
Mica has very high resistivity and dielectric strength, so it is used as an insulator; the others conduct.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Aluminium rather than copper is widely used for overhead line conductors mainly because aluminium:
सही उत्तर: ख) is lighter and cheaper for the same conductance
Although aluminium's resistivity is higher, it is much lighter and cheaper, so a larger aluminium conductor gives the same conductance at lower weight and cost.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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