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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Capacitors are commonly used in electronic circuits to:
सही उत्तर: क) block DC while allowing AC signals to pass
A capacitor is an open circuit to steady DC but its reactance falls with frequency, so AC passes.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Which quantity cannot change instantaneously in a capacitor?
सही उत्तर: ग) The voltage across it
A sudden voltage change would need infinite current (i = C dv/dt), so capacitor voltage changes continuously.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A 10 microfarad capacitor charged to 100 V is connected across an identical uncharged 10 microfarad capacitor. The final common voltage is:
सही उत्तर: क) 50 V
Charge is conserved: Q = 10 x 100 = 1000 microcoulomb shared over 20 microfarad gives 50 V.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A 100 V DC supply is switched onto an uncharged capacitor in series with a 10 kilo-ohm resistor. The current at the instant of switching is:
सही उत्तर: ख) 10 mA
At t = 0 the uncharged capacitor acts as a short circuit, so I = V / R = 100 / 10,000 = 10 mA.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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When a charged capacitor discharges through a resistor, after one time constant its voltage falls to about what percentage of its initial value?
सही उत्तर: क) 36.8%
During discharge v = V e^(-t/RC); at t = RC, v = 0.368 V.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The dielectric strength of an insulating material is commonly expressed in:
सही उत्तर: ख) kV/mm
Dielectric strength is the maximum electric field the material can withstand before breakdown, e.g. kilovolts per millimetre.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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In Coulomb's law, the constant 1/(4 pi epsilon_0) has a value of about:
सही उत्तर: ग) 9 x 10^9 N m^2/C^2
With epsilon_0 = 8.854 x 10^-12 F/m, 1/(4 pi epsilon_0) is about 9 x 10^9.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A storage battery can be charged only from a:
सही उत्तर: ग) DC source (or AC that has been rectified)
Charging must drive current in one direction to reverse the chemical reaction, so DC is required.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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In a fully charged lead-acid cell, the active material of the positive plate is:
सही उत्तर: घ) lead peroxide (PbO2)
The positive plate is lead peroxide and the negative plate is spongy lead; both become lead sulphate on discharge.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The specific gravity of the electrolyte in a fully charged lead-acid cell is about:
सही उत्तर: ख) 1.25 to 1.30
A fully charged cell reads about 1.28; it falls towards 1.1 as the cell discharges. Concentrated acid is about 1.84.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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