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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According to Coulomb's law, if the distance between two point charges is doubled, the force between them becomes:
सही उत्तर: घ) one quarter of its original value
Coulomb force varies inversely as the square of distance: F' = F/2^2 = F/4.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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By convention, the direction of electric current in a circuit is taken as:
सही उत्तर: ग) the direction of flow of positive charge, opposite to electron flow
Conventional current flows from + to - in the external circuit, opposite to the actual electron motion.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Approximately how many electrons make up a charge of one coulomb?
सही उत्तर: ग) 6.25 x 10^18
Number of electrons = 1 / (1.6 x 10^-19) = 6.25 x 10^18.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The magnitude of the charge on one electron is approximately:
सही उत्तर: ग) 1.6 x 10^-19 C
The elementary charge is about 1.602 x 10^-19 coulomb; 9.1 x 10^-31 kg is the electron's mass.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Which protective device trips when it detects an imbalance between live and neutral currents caused by leakage to earth?
सही उत्तर: घ) Residual current circuit breaker (RCCB)
An RCCB (also called ELCB/RCD) compares live and neutral currents and trips on a small earth-leakage difference, e.g. 30 mA.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A fuse protects an electrical circuit by:
सही उत्तर: क) melting and breaking the circuit when the current exceeds its rating
The fuse wire has a low melting point; excessive current heats it until it melts and opens the circuit.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The main purpose of earthing the metal body of an electrical appliance is to:
सही उत्तर: ख) protect users from electric shock by giving fault current a low-resistance path to earth
If live wire touches the body, the fault current flows to earth (blowing the fuse or tripping the breaker) instead of through a person.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The electrical energy consumed in a house is recorded by a/an:
सही उत्तर: ग) energy meter (kWh meter)
An energy meter integrates power over time and displays the consumption in kWh (units).
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Which instrument is used to measure the insulation resistance of cables and machines?
सही उत्तर: ख) Megger
A megger (insulation tester) applies a high DC voltage and reads resistance in megohms.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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An ideal voltmeter should have:
सही उत्तर: ख) very high resistance and be connected in parallel
A voltmeter connected across the element must draw negligible current, so its resistance should be very high.
💬 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।
नमस्ते! पाठ्यक्रम, सामान्य ज्ञान, भाषा परीक्षा वा कुनै प्रश्नको उत्तर बुझ्न सोध्नुहोस्।
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