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 SI unit of electric flux is:
सही उत्तर: घ) volt metre (V·m)
Electric flux Φ = E × area has units (V/m)(m²) = V·m, equivalently N m² C⁻¹.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A long transmission line, whose resistance, inductance and capacitance are spread along its whole length, is an example of a:
सही उत्तर: क) distributed-parameter network
In a distributed network the parameters cannot be separated into discrete elements; they are spread over the length.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Two ideal voltage sources of different emfs are not connected directly in parallel because:
सही उत्तर: क) it would violate Kirchhoff's voltage law (an infinite current would flow)
Ideal sources force different voltages across the same pair of nodes, which is impossible; with zero internal resistance the circulating current would be unlimited.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Kirchhoff's current and voltage laws are applicable to:
सही उत्तर: ख) linear as well as non-linear circuits
KCL and KVL follow from conservation of charge and energy and hold for any lumped circuit, whatever the nature of its elements.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The equivalent resistance of resistors connected in parallel is always:
सही उत्तर: ग) less than the smallest individual resistance
Each extra parallel path adds conductance, so 1/R_eq exceeds 1/R of every branch.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Two identical lamps are connected in series across a supply. If one lamp is short-circuited, the other lamp:
सही उत्तर: घ) glows brighter
The full supply voltage now appears across the remaining lamp, so its current and power increase.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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In a series circuit containing a lamp, a switch and a battery, the voltage measured across the open switch is:
सही उत्तर: घ) equal to the battery voltage
With the switch open no current flows, so there is no drop across the lamp and the whole battery voltage appears across the switch contacts.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Air breaks down at an electric field of about 3 kV/mm. The approximate maximum voltage that a 2 mm air gap between parallel plates can withstand is:
सही उत्तर: क) 6 kV
V = E × d = 3 kV/mm × 2 mm = 6 kV.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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In the two-wattmeter method of measuring power in a balanced three-phase load of zero power factor, the two wattmeters read:
सही उत्तर: ख) equal values of opposite sign
W₁ = VL IL cos(30° − φ) and W₂ = VL IL cos(30° + φ); with φ = 90° they become +½VL IL and −½VL IL, summing to zero.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A lighting circuit is protected by a 10 A fuse on a 230 V supply. The maximum number of 100 W lamps that can be run on it is:
सही उत्तर: ग) 23
Maximum load = 230 × 10 = 2300 W, so 2300/100 = 23 lamps.
💬 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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