ব্যাখ্যা: As compared to overhead system, the maintenance lost of underground system is very low. In underground system, there is less possibility to occur fault as compared to overhard system. If any fault is occured at a specific place the fault point should be maintained which is low cost.

ব্যাখ্যা: The phenomenon of ionisation of surrounding air around the conductor due to which luminous glow with hissing noise is rise is known as the corona effect. Corona occurs between two transmission lines when they have high potential difference.

ব্যাখ্যা: These cables are formally known as All Aluminium Conductor (AAC). These overhead aluminium conductors are used as power transmission.

ব্যাখ্যা: At higher voltage, volume of conductor is reduced. Area of conductor AI/V Where V. Supply voltage. So that material requirement is reduced and hence cost of the material and transmission reduced.

ব্যাখ্যা: Increase the total working voltage of two capacitors by connecting them in series.

ব্যাখ্যা: The power efficiency is 50% at maximum power transfer (Other 50% is dissipated at source impedance

ব্যাখ্যা: বাংলাদেশে বিদ্যুৎ বিতরণকারী প্রতিষ্ঠান হলো ৬টি, যথা- BREB, BPDB, NESCO, WZPDCL, DESCO, DPDC

ব্যাখ্যা: The phenomenon of ionisation of surrounding air around the conductor of transmission line due to which luminous glow with hissing noise is rise is known as the corona effect.

ব্যাখ্যা: Absolute zero is the lowest limit of the thermodynamic temperature scale, a state at which the enthalpy and entropy of a cooled ideal gas reach their minimum value, taken as zero kelvins. The fundamental particles or nature have minimum vibrational motion, retaining only quantum mechanical, zero-point energy-induced particle motion. The theoretical temperature is determined by extrapolating the ideal gas law; by international agreement, absolute zero is taken as-273.15° on the Celsius scale (International System of Units), which equals-459.67° on the Fahrenheit scale (United States customary units or Imperial units). The corresponding Kelvin and Rankine temperature scales set their zero points at absolute zero by definition.

ব্যাখ্যা: Corona is observed on AC transmission line only Because in AC transmission line there is focx associated

ব্যাখ্যা: (i) Cost of electrical energy per kWh is to be minimum (il) Rated voltage and frequency has to be supplied to the consumers. (iii) Reliable power has to be available. (iv) Effective protection system has to be used for isolating the faulty section and keeping other sections healthy. (v) More stable generators are to be used, so that it should not lose synchronism under faulty condition. (iv) Flexible power has to be available.

ব্যাখ্যা: ফুল-লোড ভোল্টেজ যখন নো-লোড ভোল্টেজ অপেক্ষা বেশি হবে তখন লোডের পাওয়ার ফ্যাক্টর হবে লিডিং এবং ভোল্টেজ রেগুলেশনের ঋণাত্মক মান পাওয়া যাবে।

ব্যাখ্যা: Ferranti effect occurs in case of no load or light load condition of medion and long transmission lines due to copacitance effect of the transmission lines. In case of short transmission lines, the cuparitance effect is negligible. Therefore, Jerranti effect will not occur in short transmission lines