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Electrical Distribution System Question & Answers

June 27, 2023 By Wat Electrical

This article lists 75 Electrical Distribution System MCQs for engineering students. All the Electrical Distribution System  Questions & Answers given below include a hint and a link wherever possible to the relevant topic. This is helpful for users who are preparing for their exams, interviews, or professionals who would like to brush up on the fundamentals of Electrical Distribution System.

An Electrical Distribution System is a network of electrical components and devices used to deliver electrical power from the generation source to various end users or loads. It plays a crucial role in the transmission and distribution of electricity across residential, commercial, and industrial areas.

The electrical distribution system typically starts at a power generation plant, where electricity is produced through various means such as fossil fuel combustion, nuclear reactions, hydroelectric dams, wind turbines, or solar panels. The generated electricity is then transmitted at high voltages (usually in the range of thousands of volts) to minimize transmission losses over long distances.

The transmission system consists of high-voltage power lines, transformers, and switchgear that help in stepping up or stepping down the voltage levels for efficient transmission and distribution. At substations, the voltage is stepped down to lower levels for further distribution.

Overall, the electrical distribution system forms a critical infrastructure that enables the reliable and safe supply of electricity to meet the diverse needs of residential, commercial, and industrial users.

1). In an electrical distribution system, the voltage level at which electricity is generated is typically ___________________?

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2). The purpose of a substation in an electrical distribution system is to ___________________?

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3). The primary function of a circuit breaker in an electrical distribution system is to ___________________?

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4). Overhead power lines in an electrical distribution system are commonly supported by ___________________?

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5). The main advantage of an underground distribution system compared to an overhead system is ___________________?

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6). In a radial distribution system, power flows ___________________?

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7). The device used to measure electrical energy consumption in a distribution system is called a ___________________?


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8). In a three-phase distribution system, the number of conductors required is ___________________?

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9). The purpose of a distribution transformer is to ___________________?

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10). The main component of a distribution panelboard is ___________________?

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11). Voltage drop in a distribution system is primarily caused by ___________________?

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12). Which scientist is credited with the discovery of electricity?

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13). Who invented the alternating current (AC) system of electrical distribution?

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14). What is the standard frequency for AC power distribution in most countries?

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15). What is the formula to calculate apparent power?

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16). What is the formula to calculate power factor?

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17). What is the formula to calculate three-phase power?

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18). What is the formula to calculate line current in a three-phase system?

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19). What is the formula to calculate power loss in a transmission line?

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Read more about Loss Power Factor

20). What is the formula to calculate power in a three-phase system?

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21). What is the formula to calculate voltage drop in a single-phase system?

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22). What is the formula to calculate power factor correction?

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23). What is the formula for calculating total resistance (RT) in a parallel circuit?

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24). Which formula is used to calculate line voltage (VL) in a three-phase system?

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25). What is the formula for calculating apparent power (S) in a three-phase system?

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Electrical Distribution MCQ for Quiz 

26). The formula Z = R + jX represents __________________?

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27). What is the primary function of an electrical distribution system?

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28). What is the most commonly used voltage level for residential distribution?

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29). Which of the following is a common problem in electrical distribution systems?

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30). What is the classification of loads based on their power consumption patterns?

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31). Which of the following is an example of a linear load?

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33). What type of load is an electric motor?

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34). Which classification of loads represents devices that produce magnetic fields?

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35). What type of load is a power factor correction capacitor?

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36). Which classification of loads represents devices that produce harmonics?

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37). What is the classification of loads based on their usage characteristics?

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38). Which type of load is typically found in homes and apartments?

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39). What type of load is commonly found in office buildings, shops, and restaurants?

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40). Which type of load is associated with heavy machinery and manufacturing processes?

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41). What type of load is related to agricultural activities like irrigation and livestock operations?

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42). What is the purpose of load forecasting in an electrical distribution system?

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43). What is harmonics in an electrical distribution system?

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44). What is a voltage sag in an electrical distribution system?

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45). Load modeling is important in electrical distribution systems because it helps to _________________?

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46). In load modeling, diversity refers to _________________?

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47). The load curve is a graphical representation of ___________________?

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48). The purpose of load forecasting is to ________________?

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49). The load duration curve is used to determine ________________?

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50). Demand response programs are designed to ________________?

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Electrical Distribution MCQ for Exams 

51). The power factor of an electrical load determines the ________________?

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52). The main objective of voltage regulation in distribution systems is to ________________?

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53). What is the load factor of an electrical distribution system?

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54). What is the loss factor of an electrical distribution system?

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55). What effect does an increase in load factor have on the loss factor?

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56). A distribution system has a load factor of 0.8. What is the loss factor?

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57). If the load factor of a distribution system is 1.2, what can be said about the loss factor?

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58). How can a higher load factor benefit an electrical distribution system?

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59). Which of the following factors can influence the load factor of a distribution system?

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60). What is the relationship between load factor and energy efficiency?

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61). What can be inferred about a system with a low load factor and high loss factor?

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62). Which of the following methods can help improve the load factor of a distribution system?

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63). The load factor of a distribution system is 0.6. What can be inferred about its utilization level?

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64). What is the primary function of a distribution feeder in an electrical distribution system?

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65). Which of the following is not a typical type of distribution feeder configuration?

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66). The distribution feeder voltage is typically _________________?

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67). What is the typical frequency of distribution feeder voltage in most countries?

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68). Distribution feeders are usually operated as _________________?

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69). Which of the following is a disadvantage of a radial distribution feeder?

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70). A loop distribution feeder ________________?

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71). The purpose of sectionalizing switches in a distribution feeder is to ________________?

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72). Voltage drop in a distribution feeder can be minimized by ________________?

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73). Which of the following is a characteristic of an underground distribution feeder?

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74). What is the primary purpose of reclosers in a distribution feeder?

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75). A mesh distribution feeder configuration offers ________________?

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