प्राविधिक – इलेक्ट्रिकल, मेकानिकल र टेलिकम

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

2211. The difference between an overload and a short circuit is that:

      कan overload is excess current in a healthy circuit, whereas a short circuit is a very low-impedance fault between conductors causing a very large current खa short circuit occurs only in DC circuits गan overload is a fault between live and earth घan overload always causes a larger current than a short circuit
      💬 टिप्पणी / गल्ती रिपोर्ट (०)

      छलफल / प्रश्न उत्तरमा गल्ती छ

      पठाउनुहोस्

      टिप्पणी जाँचपछि मात्र देखिन्छ।

2212. In a working series circuit of a battery, a closed (ideal) switch and a lamp, the voltage measured across the closed switch is:

      कequal to the battery voltage खzero गequal to the lamp voltage घhalf the battery voltage
      💬 टिप्पणी / गल्ती रिपोर्ट (०)

      छलफल / प्रश्न उत्तरमा गल्ती छ

      पठाउनुहोस्

      टिप्पणी जाँचपछि मात्र देखिन्छ।

2213. A capacitor is marked '4n7'. Its capacitance is:

      क4.7 pF ख4.7 nF ग4.7 μF घ47 nF
      💬 टिप्पणी / गल्ती रिपोर्ट (०)

      छलफल / प्रश्न उत्तरमा गल्ती छ

      पठाउनुहोस्

      टिप्पणी जाँचपछि मात्र देखिन्छ।

2214. An SMD resistor is marked '4R7'. Its resistance is:

      क47 Ω ख470 Ω ग4.7 kΩ घ4.7 Ω
      💬 टिप्पणी / गल्ती रिपोर्ट (०)

      छलफल / प्रश्न उत्तरमा गल्ती छ

      पठाउनुहोस्

      टिप्पणी जाँचपछि मात्र देखिन्छ।

2215. The thermal (overload) tripping element of a miniature circuit breaker works with a:

      कbimetallic strip that bends when heated by sustained overcurrent खsolenoid that acts instantly on short circuits गcapacitor that discharges घfusible wire that melts
      💬 टिप्पणी / गल्ती रिपोर्ट (०)

      छलफल / प्रश्न उत्तरमा गल्ती छ

      पठाउनुहोस्

      टिप्पणी जाँचपछि मात्र देखिन्छ।

2216. An automatic voltage stabiliser (AVR) connected before a refrigerator is used to:

      कchange the supply frequency खconvert AC into DC गkeep the output voltage nearly constant when the mains voltage varies घstore energy during power cuts
      💬 टिप्पणी / गल्ती रिपोर्ट (०)

      छलफल / प्रश्न उत्तरमा गल्ती छ

      पठाउनुहोस्

      टिप्पणी जाँचपछि मात्र देखिन्छ।

2217. The characteristic hum of a transformer at twice the supply frequency is mainly caused by:

      कcorona discharge खeddy currents in the windings गmagnetostriction of the core laminations घarcing at the terminals
      💬 टिप्पणी / गल्ती रिपोर्ट (०)

      छलफल / प्रश्न उत्तरमा गल्ती छ

      पठाउनुहोस्

      टिप्पणी जाँचपछि मात्र देखिन्छ।

2218. When several loaded cables are bunched together in one conduit, their current rating must be reduced (derated) because:

      कthe voltage between them rises खheat cannot be dissipated as easily, so the insulation could overheat गtheir resistance becomes zero घthe supply frequency changes
      💬 टिप्पणी / गल्ती रिपोर्ट (०)

      छलफल / प्रश्न उत्तरमा गल्ती छ

      पठाउनुहोस्

      टिप्पणी जाँचपछि मात्र देखिन्छ।

2219. A battery management system (BMS) in a lithium-ion battery pack mainly:

      कmonitors and protects the cells against over-voltage, under-voltage, over-current and over-temperature, and balances them खreplaces the need for a charger गconverts the battery's DC into AC घincreases the energy density of the cells
      💬 टिप्पणी / गल्ती रिपोर्ट (०)

      छलफल / प्रश्न उत्तरमा गल्ती छ

      पठाउनुहोस्

      टिप्पणी जाँचपछि मात्र देखिन्छ।

2220. In a solar home system, the main function of the charge controller is to:

      कstore energy खconvert DC to AC for appliances गincrease the panel's output voltage beyond its rating घprevent the battery from being overcharged or deeply discharged
      💬 टिप्पणी / गल्ती रिपोर्ट (०)

      छलफल / प्रश्न उत्तरमा गल्ती छ

      पठाउनुहोस्

      टिप्पणी जाँचपछि मात्र देखिन्छ।