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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For 230 V (RMS) sinusoidal mains, the voltage difference between the positive and negative peaks is about:
सही उत्तर: ग) 650 V
Peak = 230 x 1.414, about 325 V, and peak-to-peak = 2 x 325, about 650 V.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Which household appliance works mainly on the principle of eddy currents induced in the cooking vessel?
सही उत्तर: ख) Induction cooker
An induction cooker's high-frequency field induces eddy currents in the metal pan, which heat it directly.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Two inductors of 6 mH and 3 mH are connected in parallel with no mutual coupling. The equivalent inductance is:
सही उत्तर: ख) 2 mH
Parallel inductors combine like parallel resistors: (6 x 3) / (6 + 3) = 2 mH.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Coils of 2 H and 8 H with a mutual inductance of 3 H are connected in series so that their fluxes oppose each other. The total inductance is:
सही उत्तर: ग) 4 H
For series opposing connection L = L1 + L2 - 2M = 2 + 8 - 6 = 4 H.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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No emf is induced in a straight conductor moving in a uniform magnetic field when it moves:
सही उत्तर: क) parallel to the magnetic field lines
Moving parallel to the field, the conductor cuts no flux, so e = B l v sin 0 = 0.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A conductor 1 m long moves at 10 m/s in a uniform field of 1 T, with its motion making an angle of 30 degrees with the field. The induced emf is:
सही उत्तर: ख) 5 V
e = B l v sin(theta) = 1 x 1 x 10 x sin 30 degrees = 5 V.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Aluminium and platinum, whose relative permeability is only slightly greater than 1, are called:
सही उत्तर: घ) paramagnetic materials
Paramagnetic materials are weakly attracted by a magnetic field; their relative permeability is just above 1.
💬 टिप्पणी / गल्ती रिपोर्ट (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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