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 voltmeter with a sensitivity of 20 kilo-ohm per volt is set on its 10 V range. Its resistance is:
सही उत्तर: ख) 200 kilo-ohm
Resistance = sensitivity x range = 20 kilo-ohm/V x 10 V = 200 kilo-ohm.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A PMMC instrument has a uniform (linear) scale because:
सही उत्तर: घ) its deflecting torque is directly proportional to the current
In a PMMC meter torque = BANI, which is linear in I, so equal current steps give equal deflections.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The secondary of a current transformer (CT) should never be left open-circuited while the primary carries current, because:
सही उत्तर: क) a dangerously high voltage is induced across the secondary
With no secondary current to oppose it, the primary ampere-turns drive the core into saturation and induce very high secondary voltage.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A DC potentiometer measures emf more accurately than an ordinary voltmeter because:
सही उत्तर: क) it draws no current from the source at balance
At the null point no current flows from the cell, so there is no internal voltage drop.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The Schering bridge is mainly used to measure:
सही उत्तर: घ) capacitance and the dielectric loss of insulating materials
It is widely used for capacitance and loss-angle (tan delta) tests on cables and insulation.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Maxwell's bridge is used to measure:
सही उत्तर: क) inductance
Maxwell's bridge compares an unknown inductance with standard resistances and a capacitor or inductor.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The Kelvin double bridge is used for accurate measurement of:
सही उत्तर: ख) very low resistances
It eliminates the effect of lead and contact resistances, making it suitable for resistances below about 1 ohm.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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In a three-phase four-wire distribution system, the fourth wire is the:
सही उत्तर: ख) neutral
The four wires are the three phases (R, Y, B) and the neutral, giving both 400 V and 230 V supplies.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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In terms of phase quantities, the total power of a balanced three-phase load is:
सही उत्तर: क) 3 V_ph I_ph cos phi
Each of the three phases contributes V_ph I_ph cos phi.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A balanced delta load with 10 ohm resistance per phase is connected to a 400 V three-phase supply. The line current is about:
सही उत्तर: ग) 69.3 A
Phase current = 400 / 10 = 40 A; line current in delta = sqrt 3 x 40 = 69.3 A.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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