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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The short-circuit test of a transformer, done at reduced voltage with rated current, mainly gives its:
सही उत्तर: ग) full-load copper loss
The applied voltage is low, so core flux and iron loss are negligible; the input is essentially the copper loss.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The open-circuit (no-load) test of a transformer is performed mainly to determine its:
सही उत्तर: घ) core (iron) loss
With the secondary open, the current is small, so copper loss is negligible and the wattmeter reads essentially the iron loss.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The conservator tank of an oil-filled transformer:
सही उत्तर: क) accommodates the expansion and contraction of the oil with temperature
The conservator keeps the main tank full of oil while allowing for volume changes and limits the oil surface exposed to air.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Silica gel is placed in the breather of an oil-filled transformer to:
सही उत्तर: क) absorb moisture from the air drawn into the conservator
As the oil contracts air is drawn in; silica gel dries it so moisture does not contaminate the oil.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The oil in a power transformer serves:
सही उत्तर: ख) as a coolant and as insulation
Transformer oil carries heat away from the windings and core and also provides electrical insulation.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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If a voltmeter is mistakenly connected in series with a load, then:
सही उत्तर: ग) the current becomes very small and the voltmeter reads nearly the supply voltage
The very high voltmeter resistance limits the current to a tiny value, so almost all the supply voltage appears across the meter.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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If an ammeter is mistakenly connected directly across a supply (in parallel), it is likely to:
सही उत्तर: घ) draw a very large current and be damaged
An ammeter has very low resistance, so connecting it across the supply is almost a short circuit.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Errors in measurement caused by human mistakes such as misreading an instrument are called:
सही उत्तर: घ) gross errors
Gross errors arise from human carelessness in reading, recording or calculating.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A synchroscope is used to:
सही उत्तर: क) check that an incoming alternator is in phase with the busbars before paralleling
It indicates the phase difference and whether the incoming machine is running fast or slow, so it can be switched in at the right instant.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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An earth tester uses alternating current (or periodically reversed DC) mainly to:
सही उत्तर: ख) avoid errors from electrolytic polarisation and stray DC in the soil
Steady DC would cause polarisation emfs at the electrodes and be affected by stray galvanic currents; AC or reversed DC avoids this.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
यी अभ्यास प्रश्न हुन्, आधिकारिक प्रश्न होइनन्। पाठ्यक्रम, विज्ञापन र नतिजाका लागि सम्बन्धित निकायको आधिकारिक वेबसाइट हेर्नुहोस्। उत्तरमा गल्ती भेटे प्रश्नमुनिको "टिप्पणी / गल्ती रिपोर्ट" मा लेख्नुहोस्।
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