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 resistance of an earthing system should be:
सही उत्तर: ख) as low as possible
Low earth resistance allows fault current to flow easily so that protective devices operate quickly.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Earthing electrodes made by burying a metal plate (e.g. copper or GI) vertically in a pit with charcoal and salt is called:
सही उत्तर: घ) plate earthing
In plate earthing a copper or GI plate is buried with alternate layers of charcoal and salt to keep earth resistance low.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The first thing to do when rescuing a person who is in contact with a live conductor is to:
सही उत्तर: घ) switch off the supply or separate the person using a dry non-conducting object
The rescuer must break the contact safely first to avoid becoming a victim too.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Which type of fire extinguisher is suitable for a fire in live electrical equipment?
सही उत्तर: घ) Carbon dioxide (CO2)
CO2 does not conduct electricity and leaves no residue; water and foam can conduct current.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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An RCCB used for protection of people against electric shock commonly has a rated tripping current of:
सही उत्तर: ख) 30 mA
A 30 mA residual current device trips quickly enough to prevent most fatal shocks.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Which wiring arrangement allows a staircase light to be switched on or off from both the bottom and the top of the stairs?
सही उत्तर: ग) Two-way switching
Two two-way switches connected by two strap wires allow control from either location.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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In domestic wiring, single-pole switches and fuses must always be connected in the:
सही उत्तर: क) phase (live) wire
Switching the live wire ensures the appliance is not live when the switch is off or the fuse blows.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A Miniature Circuit Breaker (MCB) mainly protects a circuit against:
सही उत्तर: घ) overload and short circuit
MCBs use thermal (overload) and magnetic (short circuit) tripping mechanisms.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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According to the IEC colour code for flexible cables, the protective earth conductor is coloured:
सही उत्तर: क) green and yellow
IEC uses brown for live (phase), blue for neutral and green/yellow for protective earth.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Which instrument is used to display and observe the waveform of a voltage?
सही उत्तर: क) Cathode ray oscilloscope (CRO)
An oscilloscope plots voltage against time on a screen, showing the shape of the waveform.
💬 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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