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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One watt is equal to:
सही उत्तर: घ) one joule per second
Power is the rate of doing work, so 1 W = 1 J/s; J/C is the volt, C/s the ampere and V/A the ohm.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A 12 V source with 4 ohm internal resistance has a 12 ohm resistor across its output terminals. The Thevenin equivalent seen at those terminals is:
सही उत्तर: ख) 9 V in series with 3 ohm
V_th = 12 x 12 / (4 + 12) = 9 V and R_th = 4 || 12 = 48/16 = 3 ohm.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A circuit element whose voltage-current relationship is the same for current flowing in either direction is called:
सही उत्तर: घ) bilateral
Resistors, inductors and capacitors are bilateral; a diode is unilateral because it conducts mainly in one direction.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A source whose voltage or current is determined by a voltage or current elsewhere in the circuit is called a:
सही उत्तर: क) dependent (controlled) source
Dependent sources, such as those used in transistor models, are controlled by another circuit variable.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Tellegen's theorem states that, in any electrical network at any instant:
सही उत्तर: घ) the algebraic sum of the powers delivered to all branches is zero
Tellegen's theorem, based only on KCL and KVL, expresses conservation of power across all the branches of a network.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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In an AC circuit, maximum power is transferred to a load impedance when it equals:
सही उत्तर: ग) the complex conjugate of the source (Thevenin) impedance
With Z_L = R_th - jX_th the reactances cancel and the load resistance matches the source resistance, giving maximum power.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The superposition theorem cannot be used directly to find the:
सही उत्तर: क) power dissipated in a resistor
Power varies with the square of current or voltage and is not linear, so powers from individual sources cannot simply be added.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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In mesh analysis, a 'supermesh' is formed when:
सही उत्तर: घ) a current source is common to two meshes
When a current source lies on the branch shared by two meshes, the two meshes are combined into a supermesh and the source gives an extra constraint equation.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A circuit has 5 nodes, one of which is chosen as the reference. How many independent node-voltage equations are needed in nodal analysis?
सही उत्तर: ग) 4
Nodal analysis needs (n - 1) equations, one for each non-reference node: 5 - 1 = 4.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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An ideal current source has an internal resistance of:
सही उत्तर: ख) infinity
An ideal current source delivers the same current whatever the load, which requires an infinite parallel (internal) resistance.
💬 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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