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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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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A variable resistor connected in a circuit to control current is called a:
सही उत्तर: ख) rheostat
A rheostat is an adjustable resistance used to vary current, e.g. in speed or brightness control.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A resistor has colour bands red, red, orange. Its nominal value is:
सही उत्तर: ख) 22 kilo-ohm
Red = 2, red = 2, orange = multiplier 10^3: 22 x 1000 = 22,000 ohm.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A resistor has colour bands brown, black, red and gold. Its value is:
सही उत्तर: घ) 1 kilo-ohm +/- 5%
Brown = 1, black = 0, red = multiplier 10^2: 10 x 100 = 1000 ohm; gold = 5% tolerance.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A fuse wire should be made of a material with:
सही उत्तर: घ) a low melting point
The fuse element must melt quickly when excessive current heats it, so alloys such as tin-lead are used.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The filament of an incandescent lamp is made of tungsten mainly because tungsten has:
सही उत्तर: घ) a very high melting point
Tungsten melts at about 3400 degrees C, so it can glow white-hot without melting.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Nichrome is widely used for the heating elements of electric heaters mainly because it has:
सही उत्तर: क) high resistivity and a high melting point
High resistivity gives the required heat in a short length and it does not oxidise or melt easily at red heat.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A copper wire 100 m long has a cross-sectional area of 1 mm^2. Taking resistivity of copper as 1.7 x 10^-8 ohm-m, its resistance is:
सही उत्तर: घ) 1.7 ohm
R = rho l / A = 1.7 x 10^-8 x 100 / (1 x 10^-6) = 1.7 ohm.
💬 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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