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 1 kW electric kettle with no losses heats 2 kg of water from 20 °C to 70 °C (specific heat 4200 J/kg °C). The time taken is:
सही उत्तर: घ) 7 minutes
Heat = 2 x 4200 x 50 = 420,000 J; time = 420,000 / 1000 = 420 s = 7 minutes.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Three identical resistors are connected first in series and then in parallel across the same supply voltage. The power drawn in parallel is how many times that in series?
सही उत्तर: क) 9 times
Series: P = V^2/3R; parallel: P = V^2/(R/3) = 3V^2/R; ratio = 9.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A delta network has R_AB = 10 ohm, R_BC = 20 ohm and R_CA = 30 ohm. In the equivalent star, the resistance connected to terminal A is:
सही उत्तर: क) 5 ohm
R_A = (R_AB x R_CA) / (sum) = (10 x 30) / 60 = 5 ohm.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Millman's theorem is used to:
सही उत्तर: ग) replace several parallel voltage sources with series resistances by one equivalent source
Millman's theorem combines parallel branches, each a voltage source with a series resistance, into a single equivalent source and resistance.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The reciprocity theorem can be applied to networks that are:
सही उत्तर: क) linear and bilateral
Reciprocity holds for linear, bilateral networks: the response-to-excitation ratio stays the same when their positions are interchanged.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Nodal analysis of an electric circuit is based on:
सही उत्तर: घ) Kirchhoff's current law
Node equations are written by applying KCL at each node with unknown node voltages; mesh analysis uses KVL.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Four 1 ohm resistors form the sides of a square. The resistance measured between two diagonally opposite corners is:
सही उत्तर: घ) 1 ohm
There are two paths of 2 ohm each (two sides in series) in parallel, giving 1 ohm.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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When no current is drawn from a cell (open circuit), its terminal voltage is equal to:
सही उत्तर: घ) its emf
With no current there is no internal voltage drop, so terminal voltage = emf.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A cell of emf 1.5 V and internal resistance 0.5 ohm is short-circuited. The current that flows is:
सही उत्तर: ग) 3 A
With zero external resistance, I = E / r = 1.5 / 0.5 = 3 A.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A 12 V supply feeds a 4 ohm resistor in series with two 8 ohm resistors that are in parallel with each other. The current drawn from the supply is:
सही उत्तर: ग) 1.5 A
The parallel pair gives 4 ohm; total = 4 + 4 = 8 ohm, so I = 12 / 8 = 1.5 A.
💬 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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