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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To control one lamp from three different places, the wiring uses two two-way switches and one:
सही उत्तर: ग) Intermediate switch
An intermediate (crossover) switch placed between the two two-way switches allows control from a third point.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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When an ammeter of appreciable resistance is inserted into a low-resistance circuit, the current it shows is:
सही उत्तर: क) Less than the current that flowed before it was inserted
The meter's resistance adds to the circuit resistance, reducing the current (the loading effect of an ammeter).
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Which instrument directly indicates the phase angle (cos phi) between the voltage and current of a load?
सही उत्तर: ख) Power factor meter
A power factor meter's pointer position depends on the phase angle between voltage and current.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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An insulation resistance tester (megger) for low-voltage installations typically applies a test voltage of:
सही उत्तर: घ) 500 V or 1000 V DC
A high DC test voltage is needed to measure the very high resistance (megohms) of insulation.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Gold plating is used on connector pins and switch contacts mainly because gold:
सही उत्तर: क) Resists corrosion and oxidation, keeping contact resistance low
Gold does not tarnish, so the contact surface stays clean and reliable; silver is actually the best conductor.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The SI unit of electrical conductivity (the reciprocal of resistivity) is:
सही उत्तर: ग) Siemens per metre
Resistivity is in ohm-metre, so its reciprocal, conductivity, is in S/m.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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One henry is equal to one:
सही उत्तर: ग) Weber per ampere
L = N phi / I, so inductance is flux linkage per ampere (Wb/A); coulomb per volt is the farad.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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One weber is equal to one:
सही उत्तर: क) Volt-second
From Faraday's law, e = d(phi)/dt, so flux has units of volt x second; an ohm-second is a henry.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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With alternating current, current tends to crowd towards the outer surface of a conductor, increasing its effective resistance. This is called:
सही उत्तर: ख) Skin effect
Skin effect becomes stronger at higher frequency and for larger conductor diameters.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The absorption or release of heat when a current flows through a single conductor that has a temperature gradient along it is called the:
सही उत्तर: घ) Thomson effect
The Thomson effect occurs within one conductor; the Peltier effect occurs at a junction of two different conductors.
💬 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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