आधारभूत विद्युत् (Basic Electrical) – Basic Electrical Engineering MCQ
आधारभूत विद्युत् (Basic Electrical) – इलेक्ट्रिकल र टेलिकम
Basic Electrical Engineering · Technical – Electrical, Mechanical & Telecom · २,२९९ प्रश्न
२,२९९ प्रश्न उपलब्ध। मोड छान्नुहोस्:
आधारभूत विद्युत् (Basic Electrical): 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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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)
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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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