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 10 Ω resistor is connected directly in parallel with an ideal 12 V voltage source. The Thevenin equivalent seen at the source terminals is:
सही उत्तर: क) 12 V in series with 0 Ω
An ideal voltage source fixes the terminal voltage regardless of anything connected across it, so the parallel resistor has no effect at the terminals: V_Th = 12 V, R_Th = 0.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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When finding the Thevenin equivalent of a two-terminal network containing dependent sources, the Thevenin resistance is best found as:
सही उत्तर: ख) the open-circuit voltage divided by the short-circuit current
Dependent sources cannot simply be switched off, so R_Th = V_oc/I_sc (or by applying a test source at the terminals).
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A high-value resistor permanently connected across a large capacitor (a 'bleeder resistor') is used to:
सही उत्तर: ग) discharge the capacitor safely after the supply is switched off
The bleeder resistor slowly drains the stored charge when the supply is removed, so the terminals are not left at a dangerous voltage.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The resistor with colour bands brown, black, black, red, brown (five-band code) has a value of:
सही उत्तर: घ) 10 kΩ ± 1%
In the five-band code the first three bands are digits (1, 0, 0), the fourth is the multiplier (red = ×100) and the fifth the tolerance (brown = ±1%): 100 × 100 = 10 kΩ ± 1%.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A 10 Ω resistor produces 360 J of heat in one minute. The steady current through it is about:
सही उत्तर: ग) 0.77 A
H = I²Rt gives I² = 360/(10 × 60) = 0.6, so I = √0.6 ≈ 0.77 A.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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An aluminium conductor and a copper conductor have the same length and the same resistance. Taking resistivities 2.8 × 10⁻⁸ and 1.72 × 10⁻⁸ Ω·m and densities 2.7 and 8.9 g/cm³, the mass of the aluminium conductor is about what fraction of the copper one?
सही उत्तर: क) 0.49
Equal R and L need A_Al/A_Cu = ρ_Al/ρ_Cu = 1.63; mass ratio = 1.63 × 2.7/8.9 ≈ 0.49, so aluminium weighs about half as much.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A current of 2 A flows through a 10 Ω resistor for 1 minute. The heat produced, in calories, is about (1 cal = 4.186 J):
सही उत्तर: ख) 573 cal
H = I²Rt = 4 × 10 × 60 = 2400 J = 2400/4.186 ≈ 573 cal.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Two resistors take a total of 20 W when connected in series across 10 V, and 125 W when connected in parallel across the same 10 V. Their values are:
सही उत्तर: ग) 1 Ω and 4 Ω
Series: R₁ + R₂ = 10²/20 = 5 Ω. Parallel: R₁R₂/(R₁ + R₂) = 10²/125 = 0.8 Ω, so R₁R₂ = 4. Hence R₁ = 1 Ω and R₂ = 4 Ω.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Resistors of 2 Ω, 4 Ω and 6 Ω are connected in parallel across a DC supply. Which resistor dissipates the most power?
सही उत्तर: ख) the 2 Ω resistor
In parallel the voltage V is the same, so P = V²/R is greatest for the smallest resistance, 2 Ω.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Resistors of 2 Ω, 4 Ω and 6 Ω are connected in series across a DC supply. Which resistor dissipates the most power?
सही उत्तर: क) the 6 Ω resistor
In series the current I is the same, so P = I²R is greatest for the largest resistance, 6 Ω.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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