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 variable resistor connected in a circuit to control current is called a:
सही उत्तर: ख) rheostat
A rheostat is an adjustable resistance used to vary current, e.g. in speed or brightness control.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A resistor has colour bands red, red, orange. Its nominal value is:
सही उत्तर: ख) 22 kilo-ohm
Red = 2, red = 2, orange = multiplier 10^3: 22 x 1000 = 22,000 ohm.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A resistor has colour bands brown, black, red and gold. Its value is:
सही उत्तर: घ) 1 kilo-ohm +/- 5%
Brown = 1, black = 0, red = multiplier 10^2: 10 x 100 = 1000 ohm; gold = 5% tolerance.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A fuse wire should be made of a material with:
सही उत्तर: घ) a low melting point
The fuse element must melt quickly when excessive current heats it, so alloys such as tin-lead are used.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The filament of an incandescent lamp is made of tungsten mainly because tungsten has:
सही उत्तर: घ) a very high melting point
Tungsten melts at about 3400 degrees C, so it can glow white-hot without melting.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Nichrome is widely used for the heating elements of electric heaters mainly because it has:
सही उत्तर: क) high resistivity and a high melting point
High resistivity gives the required heat in a short length and it does not oxidise or melt easily at red heat.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A copper wire 100 m long has a cross-sectional area of 1 mm^2. Taking resistivity of copper as 1.7 x 10^-8 ohm-m, its resistance is:
सही उत्तर: घ) 1.7 ohm
R = rho l / A = 1.7 x 10^-8 x 100 / (1 x 10^-6) = 1.7 ohm.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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According to Coulomb's law, if the distance between two point charges is doubled, the force between them becomes:
सही उत्तर: घ) one quarter of its original value
Coulomb force varies inversely as the square of distance: F' = F/2^2 = F/4.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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By convention, the direction of electric current in a circuit is taken as:
सही उत्तर: ग) the direction of flow of positive charge, opposite to electron flow
Conventional current flows from + to - in the external circuit, opposite to the actual electron motion.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Approximately how many electrons make up a charge of one coulomb?
सही उत्तर: ग) 6.25 x 10^18
Number of electrons = 1 / (1.6 x 10^-19) = 6.25 x 10^18.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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