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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When the frequency of the supply to a series RL circuit (R = X_L at 50 Hz) is reduced to 25 Hz, the circuit's power factor becomes about:
सही उत्तर: ग) 0.89 lagging
At 25 Hz X_L = R/2, so pf = R/√(R² + R²/4) = 1/√1.25 ≈ 0.89.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The equivalent capacitance of a 2 μF and a 3 μF capacitor in series is connected in parallel with a 0.8 μF capacitor. The total capacitance is:
सही उत्तर: ख) 2 μF
2 ∥series 3 gives 6/5 = 1.2 μF; adding 0.8 μF in parallel gives 2 μF.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A capacitor of 1 μF is charged to 100 V and then discharged through a 1 MΩ resistor. The initial discharge current is:
सही उत्तर: ख) 100 μA
At the start the full 100 V is across the resistor: I = 100/10⁶ = 10⁻⁴ A = 100 μA.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Three resistors of 10 Ω, 20 Ω and 30 Ω in parallel are connected across a supply; the 10 Ω resistor carries 6 A. The total current from the supply is:
सही उत्तर: क) 11 A
The supply voltage is 6 × 10 = 60 V, so the currents are 6 A, 3 A and 2 A: total 11 A.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A 200 V supply feeds two resistors in series; the voltage across the first is 80 V and the current is 4 A. The resistance of the second resistor is:
सही उत्तर: क) 30 Ω
The second resistor has 200 − 80 = 120 V across it, so R = 120/4 = 30 Ω.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The voltage v = 141.4 sin(314t) V is applied across a pure 100 Ω resistor. The energy dissipated in 10 minutes is:
सही उत्तर: ग) 60 kJ
V_rms = 100 V, so P = 100²/100 = 100 W and energy = 100 × 600 s = 60 kJ.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A resistor of 10 Ω and a capacitor of reactance 10 Ω are connected in parallel. The magnitude of their combined impedance is about:
सही उत्तर: क) 7.07 Ω
|Z| = RX/√(R² + X²) = 100/√200 ≈ 7.07 Ω.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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In a series circuit of a resistor and a capacitor fed from a sinusoidal supply, the voltage across the resistor:
सही उत्तर: क) leads the voltage across the capacitor by 90°
V_R is in phase with the current, while V_C lags the current by 90°, so V_R leads V_C by 90°.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A wire of uniform cross-section has resistance 10 Ω. It is bent into a circle and connected between two points that divide the circumference in the ratio 1 : 4. The resistance between these points is:
सही उत्तर: घ) 1.6 Ω
The arcs have 2 Ω and 8 Ω in parallel: 2 × 8/10 = 1.6 Ω.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A coreless induction furnace heats the metal charge by:
सही उत्तर: घ) eddy currents induced in the charge by an alternating magnetic field
The charge acts as the secondary of a transformer whose primary is the water-cooled coil; the induced eddy currents heat it.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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