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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Two long parallel conductors 1 m apart in vacuum each carry 1 A. The force per metre length between them is:
सही उत्तर: घ) 2 x 10^-7 N
F / l = mu_0 I1 I2 / (2 pi d) = 4 pi x 10^-7 / (2 pi) = 2 x 10^-7 N/m, which was the basis of the classical definition of the ampere.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A circular coil of 100 turns and radius 0.1 m carries 1 A. The flux density at its centre (air core, mu_0 = 4 pi x 10^-7 H/m) is about:
सही उत्तर: घ) 6.28 x 10^-4 T
B = mu_0 N I / (2r) = 4 pi x 10^-7 x 100 x 1 / 0.2, about 6.28 x 10^-4 T.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Ampere's circuital law states that the line integral of the magnetic field strength H around any closed path equals:
सही उत्तर: ख) the total current enclosed by that path
The integral of H . dl around a closed loop equals the net current (ampere-turns) passing through the loop.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The Biot-Savart law is used to calculate the:
सही उत्तर: घ) magnetic field produced by a small current-carrying element
It gives the flux density dB due to a current element I dl at a point near it.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Supercapacitors (ultracapacitors) differ from ordinary capacitors mainly in having:
सही उत्तर: घ) very large capacitance, of the order of farads or more
Supercapacitors store far more charge than ordinary capacitors (farads to thousands of farads) at low voltage and charge and discharge quickly.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A ceramic disc capacitor is marked '104'. Its capacitance is:
सही उत्तर: ग) 0.1 microfarad
The code means 10 followed by four zeros in picofarads: 100,000 pF = 100 nF = 0.1 microfarad.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A capacitance of 0.001 microfarad is equal to:
सही उत्तर: ग) 1 nF
1 microfarad = 1000 nF, so 0.001 microfarad = 1 nF (= 1000 pF).
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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One farad is equal to:
सही उत्तर: घ) one coulomb per volt
Capacitance C = Q / V, so 1 F = 1 C / 1 V.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The voltage rating marked on a capacitor indicates:
सही उत्तर: ख) the maximum voltage it can safely withstand without dielectric breakdown
Exceeding the working voltage can break down the dielectric and destroy the capacitor.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Capacitors of 2 microfarad and 3 microfarad are connected in series across a 100 V DC supply. The voltage across the 2 microfarad capacitor is:
सही उत्तर: क) 60 V
In series V divides inversely as C: V_2 = 100 x 3 / (2 + 3) = 60 V, and the 3 microfarad capacitor gets 40 V.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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