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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The electric field between two parallel plates 2 mm apart with 1 kV across them is:
सही उत्तर: ग) 5 x 10^5 V/m
E = V/d = 1000/0.002 = 5 x 10^5 V/m.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Five identical 10 microfarad capacitors are available. The ratio of the maximum to the minimum capacitance obtainable using all five is:
सही उत्तर: ग) 25
All in parallel: 50 microfarad; all in series: 2 microfarad; ratio = 25.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A capacitor is charged from zero to V through a resistor from a DC source of voltage V. The energy dissipated in the resistor during charging is:
सही उत्तर: घ) equal to the energy finally stored in the capacitor
The source supplies QV = CV², of which ½CV² is stored, so the other ½CV² is lost in the resistor whatever its value.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A 20 V DC supply is applied to a coil of resistance 10 ohm and inductance 2 H. The energy stored in its magnetic field in the steady state is:
सही उत्तर: क) 4 J
Steady current = 20/10 = 2 A; W = ½LI² = ½ × 2 × 4 = 4 J.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A charged capacitor discharges through a resistor with a time constant of 2 s. Its voltage falls to half of the initial value after about:
सही उत्तर: ख) 1.39 s
e^(-t/RC) = ½ gives t = RC ln 2 = 0.693 × 2 ≈ 1.39 s.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The voltage across a 10 microfarad capacitor rises at a steady 1000 V/s. The current through the capacitor is:
सही उत्तर: ख) 10 mA
i = C dv/dt = 10 x 10^-6 × 1000 = 0.01 A.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Capacitors of 2 microfarad and 3 microfarad are connected in series across 100 V DC. The total energy stored is:
सही उत्तर: ग) 6 mJ
C_eq = 1.2 microfarad; W = ½ × 1.2 x 10^-6 × 100² = 6 x 10^-3 J.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A 4 microfarad capacitor charged to 100 V is connected across an uncharged 1 microfarad capacitor. The common final voltage is:
सही उत्तर: घ) 80 V
Charge 400 microcoulomb is shared over 5 microfarad: V = 400/5 = 80 V.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Capacitors of 2 microfarad, 3 microfarad and 6 microfarad are connected in series. The equivalent capacitance is:
सही उत्तर: क) 1 microfarad
1/C = 1/2 + 1/3 + 1/6 = 1, so C = 1 microfarad.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A capacitor charges through a resistor from a DC source. After two time constants its voltage reaches about:
सही उत्तर: क) 86.5% of the source voltage
v = V(1 − e^-2) = V(1 − 0.135) ≈ 0.865V.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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