प्राविधिक – इलेक्ट्रिकल, मेकानिकल र टेलिकम
प्राविधिक – इलेक्ट्रिकल, मेकानिकल र टेलिकम
Technical – Electrical, Mechanical & Telecom · ४,५०० प्रश्न
४,५०० प्रश्न उपलब्ध। मोड छान्नुहोस्:
इलेक्ट्रिकल र टेलिकम: 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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Leaving a lead-acid battery discharged for a long time lets hard lead sulphate crystals build up on its plates. This fault is called:
सही उत्तर: ख) Sulphation
Hard sulphate is difficult to convert back during charging, reducing the battery's capacity.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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For a storage battery, the ampere-hour efficiency is usually:
सही उत्तर: घ) Higher than its watt-hour efficiency
Watt-hour efficiency also accounts for the battery discharging at a lower voltage than it is charged at, so it is lower.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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How many lead-acid cells are connected in series in a nominal 12 V car battery?
सही उत्तर: घ) 6
Each lead-acid cell gives about 2 V, so six in series give 12 V.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A 100 Ah lead-acid battery charged at the C/10 rate takes a charging current of:
सही उत्तर: ख) 10 A
The C/10 rate is capacity divided by 10 hours: 100 Ah / 10 h = 10 A.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Death from an electric shock at mains frequency is most often caused by:
सही उत्तर: ग) Ventricular fibrillation of the heart
Current through the chest can upset the heart's rhythm, making the ventricles quiver instead of pumping blood.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A 0-150 V voltmeter has a guaranteed accuracy of +/- 1% of full scale. When it reads 75 V, the limiting error as a percentage of the reading is:
सही उत्तर: क) +/- 2%
Error = 1% of 150 V = 1.5 V; as a fraction of 75 V this is 1.5/75 = 2%.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A 3½-digit digital multimeter can display a maximum count of:
सही उत्तर: ख) 1999
The half digit can show only 0 or 1, followed by three full digits, so the maximum reading is 1999.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Hay's bridge is preferred to Maxwell's inductance-capacitance bridge for measuring inductance of coils with:
सही उत्तर: घ) A high Q factor (greater than about 10)
Maxwell's bridge suits medium-Q coils (1 to 10); Hay's bridge uses a series R-C arm that suits high-Q coils.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Apart from capacitance, the Wien bridge is commonly used to measure:
सही उत्तर: क) Frequency in the audio range
The Wien bridge balances at one frequency determined by its R and C values, so it can measure frequency.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A Q-meter is an instrument used to measure:
सही उत्तर: ग) The quality factor of coils and capacitors
A Q-meter uses series resonance to measure the Q (and related values such as inductance) of components.
💬 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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