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 rated secondary current of most current transformers (CTs) used with meters and relays is:
सही उत्तर: क) 5 A or 1 A
CT secondaries are standardised at 5 A (or 1 A) so that standard ammeters and relays can be used with any primary rating.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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'Creeping' in an induction-type energy meter refers to:
सही उत्तर: ग) slow continuous rotation of the disc when no load current flows
Creeping is caused mainly by over-compensation for friction or supply voltage, and is prevented by holes drilled in the disc.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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An energy meter has a meter constant of 1200 revolutions per kWh. If its disc makes 60 revolutions in 1 minute, the load power is:
सही उत्तर: क) 3 kW
Energy = 60/1200 = 0.05 kWh in 1/60 hour, so power = 0.05 x 60 = 3 kW.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The rotating disc of an induction-type energy meter is made of:
सही उत्तर: ग) aluminium
A light, non-magnetic, conducting aluminium disc carries the induced eddy currents that produce the driving and braking torques.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Electrostatic voltmeters are particularly suitable for measuring:
सही उत्तर: ग) high voltages, since they draw practically no steady current
They operate on the attraction between charged plates and take negligible current, making them suitable for high-voltage measurement.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The dynamometer-type (electrodynamic) wattmeter can measure power in:
सही उत्तर: क) AC as well as DC circuits
Its torque depends on the product of the currents in the fixed and moving coils, so it works on both AC and DC.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Induction-type measuring instruments can be used to measure:
सही उत्तर: ख) AC quantities only
They depend on eddy currents induced by alternating flux, so they do not work on DC.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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An instrument that uses gravity control must be:
सही उत्तर: घ) mounted vertically
The control weight acts only if the moving system turns in a vertical plane, so gravity-controlled instruments must be used upright.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The three torques required for the operation of an analog indicating instrument are:
सही उत्तर: ग) deflecting, controlling and damping torques
Deflecting torque moves the pointer, controlling torque balances it at the correct reading and damping torque brings it to rest without oscillation.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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In the two-wattmeter method, the two wattmeters read 3 kW and 1 kW. The total three-phase power is:
सही उत्तर: ग) 4 kW
Total power is the algebraic sum of the two readings: 3 + 1 = 4 kW.
💬 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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