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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An infinite ladder network has 1 ohm in each series arm and 1 ohm in each shunt arm. Its input resistance is about:
सही उत्तर: घ) 1.618 ohm
R = 1 + (1 x R)/(1 + R) gives R^2 - R - 1 = 0, so R = (1 + sqrt 5)/2 = 1.618 ohm.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Twelve 1-ohm resistors form the edges of a cube. The resistance between two diagonally opposite corners of the cube is:
सही उत्तर: क) 5/6 ohm
By symmetry the current splits 3 ways, then 6 ways, then 3 ways: R = 1/3 + 1/6 + 1/3 = 5/6 ohm.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A metal oxide varistor (MOV) connected across supply terminals is used to:
सही उत्तर: ग) Protect equipment against voltage surges by conducting heavily above a threshold voltage
A varistor's resistance falls sharply at high voltage, clamping spikes and diverting surge current.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The resistance of a light-dependent resistor (LDR):
सही उत्तर: ग) Decreases as the light falling on it increases
Light frees more charge carriers in the photoconductive material, so its resistance falls in bright light.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A potentiometer used as the volume control of an amplifier works as a:
सही उत्तर: क) Variable voltage divider
The wiper taps off an adjustable fraction of the voltage across the whole resistive track.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A surface-mount (SMD) resistor is marked '472'. Its resistance is:
सही उत्तर: ख) 4.7 kilo-ohm
The first two digits are significant figures and the third is the multiplier: 47 x 10^2 = 4700 ohm.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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For high-power applications that also need good precision, which type of fixed resistor is generally used?
सही उत्तर: घ) Wire-wound resistor
Wire-wound resistors use resistance wire (e.g. nichrome or manganin) on a ceramic former, handling high power with good stability.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Standard resistors and ammeter shunts are made of alloys such as manganin or constantan mainly because these alloys have:
सही उत्तर: घ) A very low temperature coefficient of resistance
Their resistance hardly changes with temperature, so the resistor value stays accurate as it warms up.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The temperature coefficient of resistance of annealed copper at 20 °C is about:
सही उत्तर: ख) 0.00393 per °C
Copper's resistance rises by about 0.393% per °C near room temperature (about 0.00427 per °C referred to 0 °C).
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A conductor has 10^28 free electrons per m^3 and a cross-section of 1 mm^2. If the drift velocity is 1 mm/s, the current is (e = 1.6 x 10^-19 C):
सही उत्तर: ग) 1.6 A
I = n A v e = 10^28 x 10^-6 x 10^-3 x 1.6 x 10^-19 = 1.6 A.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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