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 network has 7 branches and 4 nodes. The number of independent loop (mesh) equations is:
सही उत्तर: ग) 4
Independent loops = b - n + 1 = 7 - 4 + 1 = 4.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The nominal voltage of a single lithium-ion cell is about:
सही उत्तर: क) 3.6 to 3.7 V
A Li-ion cell has a nominal voltage of about 3.6-3.7 V (about 4.2 V when fully charged).
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A secondary cell differs from a primary cell in that a secondary cell:
सही उत्तर: घ) can be recharged by passing current in the reverse direction
Secondary cells such as lead-acid and Li-ion are rechargeable; primary cells such as dry cells are not.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The electrolyte used in a lead-acid battery is:
सही उत्तर: घ) dilute sulphuric acid
Lead-acid cells use dilute H2SO4; its specific gravity indicates the state of charge.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The nominal voltage of a single lead-acid cell is about:
सही उत्तर: घ) 2 V
Each lead-acid cell gives about 2 V, so a 12 V battery has six cells in series.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The energy stored in a 12 V, 100 Ah battery is ideally:
सही उत्तर: ग) 1.2 kWh
Energy = V x Ah = 12 x 100 = 1200 Wh = 1.2 kWh.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A fully charged 100 Ah battery supplies a steady current of 5 A. Ideally it can last for:
सही उत्तर: ग) 20 hours
Time = capacity / current = 100 Ah / 5 A = 20 h.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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When a Wheatstone bridge is balanced, the current through the galvanometer is:
सही उत्तर: ख) zero
At balance the potentials at the two galvanometer terminals are equal, so no current flows through it.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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In a balanced Wheatstone bridge with P = 10 ohm, Q = 20 ohm and R = 30 ohm, the unknown resistance S is:
सही उत्तर: ख) 60 ohm
At balance P/Q = R/S, so S = R x Q / P = 30 x 20 / 10 = 60 ohm.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Three resistors of 3 ohm each are connected to form a triangle. The resistance measured between any two corners is:
सही उत्तर: ग) 2 ohm
Between two corners, one 3 ohm resistor is in parallel with the other two in series (6 ohm): 3 x 6 / 9 = 2 ohm.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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