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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A hydropower plant uses a discharge of 2 m³/s under a net head of 100 m with an overall efficiency of 90%. Its electrical output (P = 9.81QHη kW) is about:
सही उत्तर: घ) 1.77 MW
P = 9.81 × 2 × 100 × 0.9 = 1765.8 kW ≈ 1.77 MW.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Copper is preferred to aluminium for the windings of machines and transformers mainly because copper has:
सही उत्तर: ख) lower resistivity, so windings are smaller for the same resistance
Copper's lower resistivity and better mechanical strength allow more compact windings with lower losses.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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In a parallel RLC circuit at resonance, the power factor of the circuit is:
सही उत्तर: ग) unity
At resonance the inductive and capacitive susceptances cancel, so the circuit is purely resistive.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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In AC circuits, apparent power (the product of RMS voltage and RMS current) is expressed in:
सही उत्तर: घ) volt-amperes (VA)
Apparent power S = VI is measured in VA (or kVA); active power is in W and reactive power in VAR.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A capacitor connected across a DC supply stores energy in the form of:
सही उत्तर: क) the electric field in its dielectric
The stored energy ½CV² resides in the electric field between the plates.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A non-magnetic material such as air has a B–H curve that is:
सही उत्तर: क) a straight line through the origin
For air B = μ₀H with constant μ₀, so the curve is linear with no saturation or hysteresis.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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AC is preferred to DC for large-scale generation and distribution mainly because:
सही उत्तर: ख) AC voltage can be stepped up and down easily and efficiently with transformers
Transformers allow high-voltage transmission (low current, low I²R loss) and safe low-voltage utilisation.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Compared with an ordinary inverter, an online UPS is preferred for computers mainly because:
सही उत्तर: ग) it supplies the load with practically no changeover interruption
In an online UPS the load is always fed from the inverter, so a mains failure causes no break in supply.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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In the term VRLA battery, 'VR' stands for:
सही उत्तर: घ) valve regulated
VRLA means valve-regulated lead–acid: a sealed, maintenance-free battery with a pressure relief valve.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Trickle charging of a storage battery means:
सही उत्तर: घ) charging continuously at a very small current to make up for self-discharge
A small continuous current keeps a standby battery fully charged by compensating its internal losses.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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