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 0.0172 Ω·mm²/m resistivity (typical of annealed copper) expressed in SI units is:
सही उत्तर: ग) 1.72 × 10⁻⁸ Ω·m
1 Ω·mm²/m = 10⁻⁶ Ω·m²/m = 10⁻⁶ Ω·m, so 0.0172 Ω·mm²/m = 1.72 × 10⁻⁸ Ω·m.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A 10 V source has 2 Ω internal resistance and an 8 Ω load connected. If the load is disconnected, the terminal voltage rises from 8 V to:
सही उत्तर: ख) 10 V
On open circuit no current flows, so no voltage is dropped in the internal resistance and the terminal voltage equals the emf, 10 V.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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An AC source with internal impedance (3 + j4) Ω supplies a purely resistive load. Maximum power is transferred to the load when its resistance is:
सही उत्तर: ग) 5 Ω
For a purely resistive load the condition is R_L = |Z_s| = √(3² + 4²) = 5 Ω.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A source has a fixed load resistance R_L connected to it, and its internal resistance R_s can be varied. The power delivered to R_L is greatest when:
सही उत्तर: घ) R_s = 0
With R_L fixed, P = V²R_L/(R_s + R_L)², which keeps increasing as R_s decreases, so it is greatest at R_s = 0. Matching (R_s = R_L) applies only when R_L is the variable.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Six equal resistors R form the sides of a regular hexagon. The resistance between two opposite corners is:
सही उत्तर: ख) 3R/2
Two paths of 3R each are in parallel between opposite corners, giving 3R/2.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Six equal resistors R form the sides of a regular hexagon. The resistance between two adjacent corners is:
सही उत्तर: क) 5R/6
Between adjacent corners there is R in parallel with the other five in series (5R): R × 5R/(6R) = 5R/6.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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According to the compensation theorem, a change ΔR in a branch resistance carrying current I can be represented by:
सही उत्तर: ग) an ideal voltage source of I·ΔR inserted in that branch, opposing the current
The compensation theorem replaces the change by a voltage source I·ΔR (opposing the original current); the resulting currents give the changes in all branches.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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For a connected network graph with n nodes, the rank of the (complete) incidence matrix is:
सही उत्तर: ख) n − 1
The rows of the complete incidence matrix sum to zero, so only n − 1 of them are independent; the reduced incidence matrix has n − 1 rows.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Using Cayley's formula, the number of different trees of a complete graph with 4 nodes (every pair of nodes joined by one branch) is:
सही उत्तर: ग) 16
A complete graph on n nodes has n^(n−2) trees, so 4² = 16.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A 5 A current source feeds a node that is connected to ground through a 2 Ω and a 3 Ω resistor in parallel. The node voltage is:
सही उत्तर: ग) 6 V
V = I × (2 ∥ 3) = 5 × 1.2 = 6 V.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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