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 emf induced in the secondary winding of a transformer, where the coil is stationary and the flux changes, is an example of:
सही उत्तर: घ) statically induced emf
In static induction the conductor does not move; the flux linking it changes. Dynamic induction (as in generators) needs motion.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A conductor 0.4 m long moves at 10 m/s at right angles to a uniform magnetic field of 0.5 T. The emf induced in it is:
सही उत्तर: ख) 2 V
e = B l v = 0.5 x 0.4 x 10 = 2 V.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A long solenoid 0.5 m long has 1000 turns and carries 2 A. The magnetic flux density inside it (air core) is about:
सही उत्तर: घ) 5.03 mT
B = mu_0 N I / l = 4 pi x 10^-7 x 1000 x 2 / 0.5 = 5.03 x 10^-3 T.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Eddy current loss in a magnetic core is proportional to the square of the:
सही उत्तर: घ) supply frequency
Eddy current loss is proportional to B_max^2 f^2 t^2 V, so it rises with the square of frequency.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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According to Steinmetz's empirical formula, hysteresis loss per unit volume is proportional to the maximum flux density raised to the power of about:
सही उत्तर: ख) 1.6
Hysteresis loss = eta x B_max^1.6 x f x V, where eta is the Steinmetz coefficient.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The coercive force of a magnetic material is the:
सही उत्तर: ग) reverse magnetising force needed to reduce the residual flux density to zero
Coercivity measures how strongly a material resists demagnetisation.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Residual magnetism (retentivity) of a material is the:
सही उत्तर: क) flux density remaining after the magnetising force is reduced to zero
It is the magnetism left in the material when H returns to zero.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Magnetic saturation of a ferromagnetic material means that:
सही उत्तर: क) a further increase in magnetising force produces almost no increase in flux density
When nearly all domains are aligned, B can increase only slightly with more H.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The relative permeability of air (practically the same as vacuum) is:
सही उत्तर: क) 1
Relative permeability compares a material to free space, so for air it is practically 1.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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One picofarad (pF) is equal to:
सही उत्तर: क) 10^-12 F
pico means 10^-12; micro is 10^-6 and nano is 10^-9.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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