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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Under the condition of maximum power transfer, the efficiency of power transfer from the source is:
सही उत्तर: ख) 50%
With R_L = R_th, equal power is lost in the source resistance and delivered to the load, so efficiency is 50%.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Three equal resistors of 9 ohm each are connected in delta. The resistance of each arm of the equivalent star is:
सही उत्तर: क) 3 ohm
For a balanced network R_star = R_delta / 3 = 9 / 3 = 3 ohm.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The superposition theorem can be applied only to circuits that are:
सही उत्तर: ग) linear
Superposition requires linearity, so it holds for voltages and currents in linear circuits (not directly for power).
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A network has a Thevenin voltage of 10 V and Thevenin resistance of 5 ohm. The maximum power it can deliver to a load is:
सही उत्तर: ग) 5 W
P_max = V_th^2 / (4 R_th) = 100 / 20 = 5 W.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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According to the maximum power transfer theorem, a DC source delivers maximum power to a load when the load resistance is:
सही उत्तर: क) equal to the internal (Thevenin) resistance of the source
Maximum power is transferred when R_L = R_th.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Norton's equivalent of a linear two-terminal network consists of:
सही उत्तर: घ) a current source in parallel with a resistance
Norton uses the short-circuit current I_N in parallel with R_N (equal to R_th).
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Thevenin's equivalent of a linear two-terminal network consists of:
सही उत्तर: क) a voltage source in series with a resistance
Thevenin replaces the network by V_th in series with R_th as seen from the load terminals.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A 2 kW heater is used for 3 hours daily for 30 days. If energy costs Rs. 10 per unit, the total cost is:
सही उत्तर: क) Rs. 1800
Energy = 2 kW x 3 h x 30 = 180 kWh (units); cost = 180 x 10 = Rs. 1800.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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One kilowatt-hour (kWh) of energy is equal to:
सही उत्तर: ग) 3.6 x 10^6 J
1 kWh = 1000 W x 3600 s = 3,600,000 J.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Two bulbs rated 100 W, 220 V and 60 W, 220 V are connected in series across a 220 V supply. Which bulb glows brighter?
सही उत्तर: क) The 60 W bulb
The 60 W bulb has higher resistance (R = V^2/P); in series the same current flows, so I^2 R is larger in the 60 W bulb.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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