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

2221. Bypass diodes are connected across groups of cells in a solar panel to:

      कconvert DC into AC खstop the battery discharging into the panel at night गincrease the open-circuit voltage घlet current flow around shaded cells, reducing power loss and hot spots
      💬 टिप्पणी / गल्ती रिपोर्ट (०)

      छलफल / प्रश्न उत्तरमा गल्ती छ

      पठाउनुहोस्

      टिप्पणी जाँचपछि मात्र देखिन्छ।

2222. The power rating of a solar module expressed in watt-peak (Wp) is its DC output under standard test conditions, i.e. an irradiance of:

      क1000 W/m² at a cell temperature of 25 °C ख1000 W/m² at 100 °C ग500 W/m² at 50 °C घ100 W/m² at 0 °C
      💬 टिप्पणी / गल्ती रिपोर्ट (०)

      छलफल / प्रश्न उत्तरमा गल्ती छ

      पठाउनुहोस्

      टिप्पणी जाँचपछि मात्र देखिन्छ।

2223. A digital multimeter on its voltage range usually loads a circuit much less than an ordinary analogue (moving-coil) voltmeter because it has:

      कno internal battery खa mirror scale गa very high input resistance (typically about 10 MΩ) घa very low input resistance
      💬 टिप्पणी / गल्ती रिपोर्ट (०)

      छलफल / प्रश्न उत्तरमा गल्ती छ

      पठाउनुहोस्

      टिप्पणी जाँचपछि मात्र देखिन्छ।

2224. On the continuity setting of a multimeter, a beep or a reading near zero ohms across a length of wire indicates that:

      कthe wire is broken खthe wire is continuous (unbroken) गthe wire is live घthe insulation is good
      💬 टिप्पणी / गल्ती रिपोर्ट (०)

      छलफल / प्रश्न उत्तरमा गल्ती छ

      पठाउनुहोस्

      टिप्पणी जाँचपछि मात्र देखिन्छ।

2225. When the insulation between two conductors is tested with a megger, a reading close to 'infinity' indicates:

      कa short circuit between the conductors खgood, healthy insulation गa faulty megger घa broken (open) conductor
      💬 टिप्पणी / गल्ती रिपोर्ट (०)

      छलफल / प्रश्न उत्तरमा गल्ती छ

      पठाउनुहोस्

      टिप्पणी जाँचपछि मात्र देखिन्छ।

2226. The insulation resistance of a cable measured with a megger generally:

      कbecomes zero for a healthy cable खincreases with temperature गdecreases as the temperature and moisture of the insulation increase घis independent of temperature and moisture
      💬 टिप्पणी / गल्ती रिपोर्ट (०)

      छलफल / प्रश्न उत्तरमा गल्ती छ

      पठाउनुहोस्

      टिप्पणी जाँचपछि मात्र देखिन्छ।

2227. An antistatic wrist strap used when handling electronic components is connected to earth through a resistance of about 1 MΩ so that:

      कstatic charge drains away safely while any current through the wearer is limited खthe component receives a charge गthe strap acts as a fuse घthe wearer is fully insulated from earth
      💬 टिप्पणी / गल्ती रिपोर्ट (०)

      छलफल / प्रश्न उत्तरमा गल्ती छ

      पठाउनुहोस्

      टिप्पणी जाँचपछि मात्र देखिन्छ।

2228. Main protective (equipotential) bonding connects incoming metal water and gas pipes to the main earthing terminal in order to:

      कreduce the electricity bill खcarry the normal load current गimprove the power factor घkeep all simultaneously accessible metal parts at the same potential during a fault
      💬 टिप्पणी / गल्ती रिपोर्ट (०)

      छलफल / प्रश्न उत्तरमा गल्ती छ

      पठाउनुहोस्

      टिप्पणी जाँचपछि मात्र देखिन्छ।

2229. In a TT earthing system, the consumer's installation is earthed:

      कthrough the neutral conductor of the supply खthrough a combined neutral-and-earth (PEN) conductor गthrough its own local earth electrode, independent of the supply earth घnot at all
      💬 टिप्पणी / गल्ती रिपोर्ट (०)

      छलफल / प्रश्न उत्तरमा गल्ती छ

      पठाउनुहोस्

      टिप्पणी जाँचपछि मात्र देखिन्छ।

2230. A three-phase supply taken from a delta-connected winding:

      कhas a line current equal to the phase current खalways provides 230 V as well as 400 V गhas a line voltage √3 times the phase voltage घhas no star point, so no neutral conductor can be taken from it directly
      💬 टिप्पणी / गल्ती रिपोर्ट (०)

      छलफल / प्रश्न उत्तरमा गल्ती छ

      पठाउनुहोस्

      टिप्पणी जाँचपछि मात्र देखिन्छ।