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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A series RLC circuit has L = 0.1 H and C = 10 microfarad. Its resonant frequency is about:
सही उत्तर: ग) 159 Hz
f0 = 1 / (2 pi sqrt(LC)) = 1 / (2 pi x sqrt(10^-6)) = 1 / (2 pi x 10^-3) = 159 Hz.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Power factor of an AC circuit is the ratio of:
सही उत्तर: ग) true (active) power to apparent power
pf = P / S = cos phi, which also equals R / Z.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The average (DC) value of a half-wave rectified sine wave of peak value Vm is:
सही उत्तर: ख) Vm / pi
The area of one half-cycle (2Vm/omega) averaged over a full period gives Vm/pi, about 0.318 Vm.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The RMS value of a half-wave rectified sine wave of peak value Vm is:
सही उत्तर: ख) Vm / 2
Only half the cycle has power, so the mean square is Vm^2/4 and the RMS value is Vm/2.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The angular frequency omega of an AC supply is related to its frequency f by:
सही उत्तर: घ) omega = 2 pi f
One cycle is 2 pi radians, so omega = 2 pi f radians per second.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A magnetic circuit has an mmf of 500 ampere-turns and a reluctance of 2.5 x 10^5 AT/Wb. The flux is:
सही उत्तर: ग) 2 mWb
Flux = mmf / reluctance = 500 / 250,000 = 0.002 Wb = 2 mWb.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A material such as bismuth or copper, with relative permeability slightly less than 1, is called:
सही उत्तर: घ) diamagnetic
Diamagnetic materials are weakly repelled by a magnetic field; paramagnetic ones have mu_r slightly above 1.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Which statement about magnetic lines of force is correct?
सही उत्तर: ख) They never intersect each other
If two lines crossed, the field would have two directions at one point, which is impossible.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The strength of an electromagnet can be increased by:
सही उत्तर: ख) increasing the number of turns or the current
The magnetising force depends on ampere-turns (N x I).
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Two coils of self-inductance 2 H and 8 H with mutual inductance 3 H are connected in series so that their fluxes aid each other. The total inductance is:
सही उत्तर: ग) 16 H
Series aiding: L = L1 + L2 + 2M = 2 + 8 + 6 = 16 H.
💬 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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