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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The electric field strength at a distance of 1 m from a point charge of 1 nC in air is about:
सही उत्तर: ग) 9 V/m
E = k q / r^2 = 9 x 10^9 x 10^-9 / 1 = 9 V/m.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Two point charges of 1 microcoulomb each are 1 m apart in air. The force between them is about:
सही उत्तर: ग) 9 x 10^-3 N
F = k q1 q2 / r^2 = 9 x 10^9 x 10^-6 x 10^-6 / 1 = 9 x 10^-3 N.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The relative permittivity (dielectric constant) of pure water at room temperature is approximately:
सही उत्तर: क) 80
Water is a highly polar liquid with a dielectric constant of about 80.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A charged capacitor is connected across an identical uncharged capacitor. What fraction of the original stored energy is lost in the process?
सही उत्तर: ख) One half
Charge is shared so each has V/2; total energy = 2 x (1/2)C(V/2)^2 = (1/4)CV^2, half of the original (1/2)CV^2.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The capacitance of an isolated metal sphere of radius 9 cm in air is about (1/(4 pi epsilon_0) = 9 x 10^9):
सही उत्तर: घ) 10 pF
C = 4 pi epsilon_0 r = r / (9 x 10^9) = 0.09 / (9 x 10^9) = 10^-11 F = 10 pF.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A 20 V DC source is switched onto a series circuit of R = 10 ohm and L = 2 H. The initial rate of rise of current is:
सही उत्तर: घ) 10 A/s
At t = 0 the current is zero, so the full voltage appears across L: di/dt = V/L = 20/2 = 10 A/s.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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At the instant a switch closes, an ideal inductor that was carrying no current behaves like a/an:
सही उत्तर: ख) Open circuit
Inductor current cannot change instantly, so it stays zero at t = 0+, just like an open circuit.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Under the principle of duality, the dual of a series RL circuit fed by a voltage source is a:
सही उत्तर: ग) Parallel GC circuit fed by a current source
Duality swaps series with parallel, voltage with current, R with G and L with C.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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In the graph of a connected network with n nodes, a tree contains how many branches (twigs)?
सही उत्तर: क) n - 1
A tree joins all n nodes without forming a loop, which needs exactly n - 1 branches; the remaining branches are links.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Two identical batteries, each 12 V with 1 ohm internal resistance, are connected in parallel across a 5.5 ohm load. The load current is:
सही उत्तर: ख) 2 A
The parallel pair is equivalent to 12 V with 0.5 ohm, so I = 12 / (0.5 + 5.5) = 2 A.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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