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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Inserting a dielectric of relative permittivity 5 between the plates of an air capacitor (filling the gap) changes its capacitance to:
सही उत्तर: ग) 5 times the original value
C = epsilon_0 epsilon_r A / d, so C increases in proportion to epsilon_r.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A 500 W electric iron is used for 2 hours. The heat produced is:
सही उत्तर: घ) 3.6 x 10^6 J
Energy = P t = 500 x 2 x 3600 = 3,600,000 J.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The heat produced in a resistor according to Joule's law is given by:
सही उत्तर: ख) H = I^2 R t
Joule's law states that heat is proportional to the square of current, resistance and time.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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One British horsepower (hp) is approximately equal to:
सही उत्तर: ग) 746 W
1 hp is approximately 746 W (British); metric hp is about 735.5 W.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A motor takes 2 kW of electrical input and delivers 1.6 kW of mechanical output. Its efficiency is:
सही उत्तर: घ) 80%
Efficiency = output / input = 1.6 / 2 = 0.8 = 80%.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Five 40 W tube lights are used for 6 hours daily for 30 days. The energy consumed is:
सही उत्तर: ख) 36 units (kWh)
Energy = 5 x 40 W x 6 h x 30 = 36,000 Wh = 36 kWh.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A resistive heater is rated 1000 W at 230 V. If the supply voltage falls to 115 V, the power becomes about:
सही उत्तर: क) 250 W
P = V^2/R; halving the voltage reduces power to one quarter: 1000/4 = 250 W.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Three resistors of 30 ohm each are connected in star. The resistance of each arm of the equivalent delta is:
सही उत्तर: ग) 90 ohm
For equal resistors, R_delta = 3 R_star = 3 x 30 = 90 ohm.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Which of the following is a passive circuit element?
सही उत्तर: ग) Resistor
Passive elements cannot supply net energy; resistors, inductors and capacitors are passive.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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When finding the Thevenin resistance of a network with only independent sources, the sources are replaced by:
सही उत्तर: क) short circuits for voltage sources and open circuits for current sources
Sources are 'killed' by replacing them with their internal resistances: zero for voltage sources and infinite for current sources.
💬 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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