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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Two identical 12 V, 100 Ah batteries are connected in parallel. The battery bank is rated:
सही उत्तर: ख) 12 V, 200 Ah
Parallel connection keeps the voltage the same and adds the ampere-hour capacities.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The size of modern PVC-insulated copper wiring cables is specified by their:
सही उत्तर: घ) conductor cross-sectional area in square millimetres
Cable sizes such as 1.5, 2.5 or 4 sq mm state the conductor area, which determines current-carrying capacity.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The severity of an electric shock to the human body depends mainly on the:
सही उत्तर: क) current that flows through the body
Physiological effects are caused by the current through the body and its path and duration, not by voltage alone.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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In pipe earthing, the earth electrode is usually a:
सही उत्तर: घ) galvanised iron pipe buried vertically in moist ground
A perforated GI pipe is driven vertically into the ground, often surrounded by alternate layers of charcoal and salt to keep the soil moist.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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An isolator in an electrical installation is designed to be operated:
सही उत्तर: क) only when the circuit is not carrying load current
An isolator has no arc-quenching ability, so it is opened only after the circuit breaker has interrupted the load.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Type C miniature circuit breakers (which trip magnetically at about 5 to 10 times rated current) are generally preferred for:
सही उत्तर: ख) circuits feeding motors and other loads with moderate inrush currents
The higher instantaneous trip level of type C MCBs prevents nuisance tripping from motor starting currents; type B suits resistive loads.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A fuse with a rated current of 10 A melts at a minimum current of 15 A. Its fusing factor is:
सही उत्तर: ख) 1.5
Fusing factor = minimum fusing current / rated current = 15 / 10 = 1.5; it is always greater than 1.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Measurement errors that repeat in the same direction every time, for example because an instrument is wrongly calibrated, are called:
सही उत्तर: ग) systematic errors
Systematic errors have a definite cause and bias all readings the same way; they can be corrected by calibration.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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On the resistance scale of an analog multimeter (series-type ohmmeter), the zero-ohm mark is at the:
सही उत्तर: ख) right-hand end, where full-scale deflection occurs
With the leads shorted, maximum current flows and the pointer deflects fully, so zero ohm is at the right and infinity at the left.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The standard secondary voltage of a potential (voltage) transformer used for metering is usually:
सही उत्तर: क) 110 V
PTs step high system voltages down to a standard 110 V (line) for meters and protective relays.
💬 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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