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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The RMS value of a steady DC voltage of 10 V is:
सही उत्तर: ग) 10 V
For a constant voltage the square root of the mean square is the value itself, 10 V.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A bridge rectifier converts a sine wave of peak Vm into full-wave pulsating DC. The mean value of this output is:
सही उत्तर: ख) 2Vm / pi
Each half-cycle averages 2Vm / pi (about 0.637 Vm), and full-wave rectification makes every half-cycle positive.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The RMS value of a symmetrical triangular wave of peak value Vm is:
सही उत्तर: घ) Vm / sqrt 3
Integrating the square of a linear ramp gives a mean square of Vm^2 / 3, so the RMS value is Vm / sqrt 3 (about 0.577 Vm).
💬 टिप्पणी / गल्ती रिपोर्ट (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)
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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