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 identical cells are connected in parallel, compared with a single cell:
सही उत्तर: ग) the emf stays the same but the current capacity increases
Parallel cells share the load current; the emf is that of one cell while the capacity (Ah) adds.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The nominal voltage of a nickel-cadmium (Ni-Cd) cell is:
सही उत्तर: घ) 1.2 V
Ni-Cd and Ni-MH cells have a nominal voltage of 1.2 V.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The nominal emf of a Leclanché dry cell (common zinc-carbon torch cell) is:
सही उत्तर: ख) 1.5 V
Zinc-carbon dry cells give about 1.5 V.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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In an electric iron, the thermostat is used to:
सही उत्तर: क) keep the temperature near the set value by switching the supply on and off
A bimetallic thermostat opens the circuit when the set temperature is reached and closes it when it cools.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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LED lamps are replacing incandescent lamps mainly because LEDs:
सही उत्तर: ग) give much more light per watt and last longer
LEDs have far higher luminous efficacy and longer life than filament lamps.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A lamp of luminous intensity 100 candela is 2 m above a surface, which faces it directly. The illuminance on the surface directly below the lamp is:
सही उत्तर: ग) 25 lux
By the inverse square law, E = I / d^2 = 100 / 2^2 = 25 lux.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The luminous efficacy of a lamp is expressed in:
सही उत्तर: क) lumens per watt
Efficacy is the light output (lumens) produced per watt of electrical input.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A 1 kW electric kettle with no losses heats 2 kg of water from 20 °C to 70 °C (specific heat 4200 J/kg °C). The time taken is:
सही उत्तर: घ) 7 minutes
Heat = 2 x 4200 x 50 = 420,000 J; time = 420,000 / 1000 = 420 s = 7 minutes.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Three identical resistors are connected first in series and then in parallel across the same supply voltage. The power drawn in parallel is how many times that in series?
सही उत्तर: क) 9 times
Series: P = V^2/3R; parallel: P = V^2/(R/3) = 3V^2/R; ratio = 9.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A delta network has R_AB = 10 ohm, R_BC = 20 ohm and R_CA = 30 ohm. In the equivalent star, the resistance connected to terminal A is:
सही उत्तर: क) 5 ohm
R_A = (R_AB x R_CA) / (sum) = (10 x 30) / 60 = 5 ohm.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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