प्राविधिक – इलेक्ट्रिकल, मेकानिकल र टेलिकम
प्राविधिक – इलेक्ट्रिकल, मेकानिकल र टेलिकम
Technical – Electrical, Mechanical & Telecom · ४,५०० प्रश्न
४,५०० प्रश्न उपलब्ध। मोड छान्नुहोस्:
इलेक्ट्रिकल र टेलिकम: 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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Above its Curie temperature, a ferromagnetic material such as iron:
सही उत्तर: घ) loses its ferromagnetism and becomes paramagnetic
Thermal agitation destroys the alignment of magnetic domains above the Curie point (about 770 degrees C for iron).
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The leakage coefficient of a magnetic circuit, defined as total flux divided by useful flux, is:
सही उत्तर: ख) always greater than 1
Some flux always leaks away from the useful path, so total flux exceeds useful flux; typical values are about 1.1 to 1.25.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The spreading out of magnetic flux lines at an air gap in a magnetic circuit is called:
सही उत्तर: घ) fringing
At an air gap the flux bulges outward, increasing the effective area of the gap; this is called fringing.
💬 टिप्पणी / गल्ती रिपोर्ट (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)
यी अभ्यास प्रश्न हुन्, आधिकारिक प्रश्न होइनन्। पाठ्यक्रम, विज्ञापन र नतिजाका लागि सम्बन्धित निकायको आधिकारिक वेबसाइट हेर्नुहोस्। उत्तरमा गल्ती भेटे प्रश्नमुनिको "टिप्पणी / गल्ती रिपोर्ट" मा लेख्नुहोस्।
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