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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A ceiling rose is used to:
सही उत्तर: ख) connect a pendant lamp or ceiling fan to the fixed wiring
The ceiling rose provides terminals where the flexible cord of a fitting joins the fixed installation.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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In the loop-in system of house wiring:
सही उत्तर: ग) connections are taken by looping the conductors at the terminals of switches and lamp holders, avoiding joints
Loop-in wiring brings the conductors into and out of each outlet's terminals, so no hidden joints are needed.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The maximum continuous conductor operating temperature for general-purpose PVC-insulated cables is about:
सही उत्तर: ग) 70 °C
General-purpose PVC insulation is rated for a conductor temperature of about 70 °C; higher temperatures soften and degrade it.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The neutral conductor of a supply differs from the earth conductor in that:
सही उत्तर: घ) the neutral normally carries the return current, while the earth conductor carries current only under fault
The neutral is part of the working circuit; the protective earth is a safety path that is normally current-free.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Carbon brushes are used in DC machines mainly because carbon:
सही उत्तर: क) is self-lubricating and helps commutation with less sparking
Carbon's contact resistance aids commutation and it causes little wear on the commutator.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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High-speed turbo-alternators driven by steam turbines usually have:
सही उत्तर: ख) cylindrical (non-salient pole) rotors
Long, small-diameter cylindrical rotors withstand the large centrifugal forces at 1500–3000 rpm.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A synchronous motor:
सही उत्तर: ख) runs only at synchronous speed and is not self-starting
It locks into step with the rotating field; damper windings or other means are needed to bring it near synchronous speed.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A universal motor, which runs on both AC and DC, is basically a:
सही उत्तर: ग) series-wound commutator motor
In a series motor the field and armature currents reverse together, so torque keeps the same direction on AC.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Ordinary household ceiling fans commonly use a:
सही उत्तर: घ) single-phase capacitor (permanent split capacitor) induction motor
A capacitor in series with the auxiliary winding gives the phase shift needed for a rotating field and starting torque.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A plain single-phase induction motor is not self-starting because:
सही उत्तर: क) a single-phase winding produces a pulsating, not a rotating, magnetic field
A pulsating field gives no net starting torque; an auxiliary winding (often with a capacitor) is added to start it.
💬 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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