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 capacitors are connected in series across a DC supply, which quantity is the same for every capacitor?
सही उत्तर: ग) The charge
The same charge flows onto each series capacitor; the voltage divides in inverse proportion to capacitance.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Gauss's law states that the total electric flux through any closed surface equals:
सही उत्तर: घ) the net charge enclosed divided by epsilon_0
Total flux = Q_enclosed / epsilon_0, independent of the shape of the closed surface.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The electric potential at a distance of 0.1 m from a point charge of 1 microcoulomb in air is (take k = 9 x 10^9 N m^2/C^2):
सही उत्तर: ग) 9 x 10^4 V
V = kQ / r = 9 x 10^9 x 10^-6 / 0.1 = 9 x 10^4 V.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The work done in moving a charge along an equipotential surface is:
सही उत्तर: क) zero
All points of an equipotential surface are at the same potential, so W = q x (potential difference) = 0.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The electric field inside a hollow charged metal conductor (in electrostatic equilibrium) is:
सही उत्तर: ग) zero
Charge resides on the outer surface, so the field inside is zero; this is the basis of electrostatic shielding (Faraday cage).
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Electric lines of force (field lines):
सही उत्तर: ख) start on positive charges and end on negative charges
Electrostatic field lines originate on positive charges and terminate on negative charges, and they never intersect.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A motor delivers an output of 5 hp while drawing 4.5 kW of electrical input. Taking 1 hp = 746 W, its efficiency is about:
सही उत्तर: ख) 83%
Output = 5 x 746 = 3730 W, so efficiency = 3730 / 4500, about 0.83 or 83%.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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One watt is equal to:
सही उत्तर: घ) one joule per second
Power is the rate of doing work, so 1 W = 1 J/s; J/C is the volt, C/s the ampere and V/A the ohm.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A 12 V source with 4 ohm internal resistance has a 12 ohm resistor across its output terminals. The Thevenin equivalent seen at those terminals is:
सही उत्तर: ख) 9 V in series with 3 ohm
V_th = 12 x 12 / (4 + 12) = 9 V and R_th = 4 || 12 = 48/16 = 3 ohm.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A circuit element whose voltage-current relationship is the same for current flowing in either direction is called:
सही उत्तर: घ) bilateral
Resistors, inductors and capacitors are bilateral; a diode is unilateral because it conducts mainly in one direction.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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