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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Silicon and germanium are classified as:
सही उत्तर: ग) semiconductors
Their resistivity lies between that of conductors and insulators and falls as temperature rises.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Which of the following materials is a good electrical insulator?
सही उत्तर: ग) Mica
Mica has very high resistivity and dielectric strength, so it is used as an insulator; the others conduct.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Aluminium rather than copper is widely used for overhead line conductors mainly because aluminium:
सही उत्तर: ख) is lighter and cheaper for the same conductance
Although aluminium's resistivity is higher, it is much lighter and cheaper, so a larger aluminium conductor gives the same conductance at lower weight and cost.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Which metal is the best conductor of electricity at room temperature?
सही उत्तर: ख) Silver
Silver has the lowest resistivity of all metals (about 1.6 x 10^-8 ohm-m), slightly lower than copper.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The SI unit of the electrochemical equivalent (z) of a substance is:
सही उत्तर: घ) kilogram per coulomb (kg/C)
From m = z I t = z Q, z = m / Q, so its unit is kg/C.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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In electroplating, the article to be plated is connected as the:
सही उत्तर: क) cathode
Metal ions from the solution are deposited on the cathode, so the object is made the negative electrode.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Faraday's second law of electrolysis states that when the same quantity of electricity passes through different electrolytes, the masses liberated are proportional to their:
सही उत्तर: ख) chemical equivalents
m1/m2 = E1/E2, where E is the chemical equivalent (atomic mass / valency).
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A quartz crystal that produces a voltage when it is mechanically stressed shows the:
सही उत्तर: ग) piezoelectric effect
Piezoelectric materials convert mechanical stress into voltage and vice versa; this is used in crystal oscillators.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The heating or cooling that occurs at the junction of two different metals when a current passes through it is called the:
सही उत्तर: ख) Peltier effect
In the Peltier effect, heat is absorbed or released at a junction depending on the direction of current.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A 2 kW, 230 V heater is to be protected by a fuse. Which standard fuse rating is most suitable?
सही उत्तर: ख) 10 A
Full-load current = 2000 / 230 = 8.7 A, so the next standard rating above it, 10 A, is chosen.
💬 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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