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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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)
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Two lamps rated 60 W, 230 V and 100 W, 230 V are connected in parallel across a 230 V supply. Which lamp glows brighter?
सही उत्तर: घ) The 100 W lamp
In parallel each lamp receives its rated 230 V and so dissipates its rated power; the 100 W lamp gives more light.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A 10 V supply feeds two 10 kilo-ohm resistors in series. A 10 kilo-ohm load is connected across the lower resistor. The voltage across the load is about:
सही उत्तर: क) 3.33 V
The lower resistor in parallel with the load is 5 kilo-ohm, so V = 10 x 5 / (10 + 5), about 3.33 V; loading reduces the divider output.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A 10 ohm and a 40 ohm resistor are connected in parallel. The equivalent resistance is:
सही उत्तर: घ) 8 ohm
R = (10 x 40) / (10 + 40) = 400 / 50 = 8 ohm.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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