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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A 2 microfarad capacitor is connected in series with a parallel pair of 3 microfarad capacitors. The equivalent capacitance is:
सही उत्तर: क) 1.5 microfarad
Parallel pair = 3 + 3 = 6 microfarad; in series with 2: (2 x 6) / (2 + 6) = 1.5 microfarad.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Using superposition, one source alone drives 3 A through a resistor and a second source alone drives 1 A through it in the opposite direction. With both sources acting, the current is:
सही उत्तर: ग) 2 A in the direction of the 3 A current
Superposition adds the individual responses algebraically: 3 - 1 = 2 A.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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If the voltage across a fixed resistor is doubled, the power it dissipates becomes:
सही उत्तर: ग) Four times
P = V^2 / R, so doubling V multiplies the power by 2^2 = 4.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A core of relative permeability 500 completely fills the magnetic path of a coil that was previously air-cored. Its inductance becomes:
सही उत्तर: क) 500 times larger
L = N^2 mu_0 mu_r A / l is directly proportional to mu_r.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Inserting a soft iron core into an air-cored solenoid carrying a fixed current:
सही उत्तर: ख) Greatly increases the magnetic flux
The iron's high permeability lowers the reluctance of the path, so the same mmf produces much more flux.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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An electromagnetic relay is:
सही उत्तर: घ) An electrically operated switch worked by an electromagnet
Current in the relay coil magnetises a core that pulls an armature to open or close separate contacts.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The Faraday constant, the charge carried by one mole of electrons, is approximately:
सही उत्तर: घ) 96,500 C
F = N_A x e = 6.022 x 10^23 x 1.602 x 10^-19 = about 96,485 C/mol.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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In a balanced three-phase, four-wire star system, power is measured with one wattmeter connected in one phase (current coil in the line, pressure coil between that line and neutral). The total power is:
सही उत्तर: ख) 3 times the wattmeter reading
The wattmeter reads one phase's power, and in a balanced system all three phases take equal power.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A single-phase motor draws 5 A from a 230 V supply and a wattmeter reads 920 W. The power factor is:
सही उत्तर: ग) 0.8
pf = P / (V I) = 920 / (230 x 5) = 920 / 1150 = 0.8.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Two currents i1 = 10 sin(wt) A and i2 = 10 sin(wt + 120 degrees) A flow into the same wire. The peak value of their sum is:
सही उत्तर: क) 10 A
Phasor sum of two equal 10 A phasors 120 degrees apart = 2 x 10 x cos 60 = 10 A.
💬 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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