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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Which type of wiring gives the best mechanical protection and fire safety, and is preferred in workshops?
सही उत्तर: ख) Metal conduit wiring
Wires drawn through steel conduit are protected from mechanical damage and fire, though the system is costly.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A lightning arrester protects electrical equipment by:
सही उत्तर: घ) diverting high-voltage surges safely to earth
It offers a low-resistance path to earth for surge voltages while remaining an insulator at normal voltage.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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An HRC (High Rupturing Capacity) fuse is used because it can:
सही उत्तर: घ) safely interrupt very large short-circuit currents
HRC fuses have a sand-filled ceramic body that quenches the arc, allowing them to clear very high fault currents.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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In the common Nepali/Indian three-pin plug, the earth pin is:
सही उत्तर: घ) the thickest and longest pin
The earth pin is longer so it connects first and disconnects last, and thicker so the plug cannot be inserted wrongly.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A neon test screwdriver (line tester) glows when its tip touches the:
सही उत्तर: ख) phase (live) wire
Current flows from the live conductor through the neon lamp and the user's body to earth, lighting the lamp.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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In an IP rating such as IP65, the second digit indicates the degree of protection against:
सही उत्तर: ग) water
The first digit is protection against solids/dust and the second against water.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The symbol of a square drawn inside another square on an electrical appliance indicates that it is:
सही उत्तर: क) double insulated (Class II) and needs no earth connection
Class II appliances have double or reinforced insulation, so they do not rely on an earth wire.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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According to the IEC colour code for flexible cables, the neutral conductor is coloured:
सही उत्तर: घ) blue
IEC colours: brown for phase (live), blue for neutral and green-yellow for protective earth.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The nominal single-phase (phase to neutral) supply voltage used for homes in Nepal is:
सही उत्तर: क) 230 V
Nepal's low-voltage supply is 230 V single-phase and 400 V three-phase at 50 Hz.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Connecting a voltmeter of fairly low resistance across a high-resistance part of a circuit usually makes its reading:
सही उत्तर: क) lower than the true voltage
The meter's resistance appears in parallel and lowers the effective resistance, reducing the voltage (loading effect).
💬 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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