Transmission Distribution Question & AnswersMay 9, 2023 By Wat Electrical This article lists 100 Transmission Distribution MCQs for engineering students. All the Transmission Distribution Questions & Answers below include a hint and a link to the relevant topic wherever possible. This is helpful for users who are preparing for their exams, interviews, or professionals who would like to brush up on the fundamentals of Transmission Distribution.Transmission and distribution are two key components of the electrical power system that work together to deliver electricity to consumers. Transmission refers to the movement of high-voltage electricity from power plants to local substations, typically over long distances using high-voltage power lines. This process is necessary because electricity generated at power plants is typically at a very high voltage, which is too dangerous for most consumers to use directly. Transmission systems are designed to minimize the loss of electrical energy as it travels over long distances, typically by using HVDC lines or HVAC lines. Distribution, on the other hand, refers to the process of delivering lower-voltage electricity from local substations to individual consumers. This typically involves the use of medium-voltage power lines, transformers, and other equipment to reduce the voltage of the electricity to safe levels for use in homes, businesses, and other facilities. Overall, transmission and distribution systems work together to ensure that electrical power is delivered reliably and efficiently to consumers across large geographic areas. 1). What is the purpose of transformers in the electrical power system? To step up or step down the voltage of the electricity To convert AC to DC power To transmit electricity over long distances None of the above None Hint2). Which component of the electrical power system is responsible for regulating the voltage of the electricity? Transformers Substations Power plants None of the above None Hint3). What does the term "HVAC" stand for in the context of electrical power transmission? High-voltage air conditioning High-voltage alternating current High-voltage direct current High-voltage electrical system None Hint4). What is the typical voltage range used for HVAC transmission lines? Less than 100 volts 100-500 volts 500-1000 volts More than 1000 volts None Hint5). What is the primary reason why HVAC transmission lines are preferred over HVDC lines in some situations? They experience less power loss over long distances They are more efficient at converting AC to DC power They are less expensive to install and maintain They are more reliable in extreme weather conditions None Hint6). Which of the following is a disadvantage of using HVAC transmission lines? a) They are more expensive than HVDC lines They experience more power loss over long distances They are less reliable in extreme weather conditions They are less efficient at converting AC to DC power None Hint7). What is the full form of HVDC? High Voltage Direct Current High Voltage Differential Current High Velocity Direct Current High Velocity Differential Current None Hint8). Which of the following is not an advantage of HVDC transmission? Lower line losses Lower cost of transmission Smaller right-of-way requirements Reduced interference with communication lines None Hint9). Which of the following is a disadvantage of HVDC transmission? Limited transmission capacity Limited transmission distance Higher line losses than AC transmission Cannot be used for underground cables None Hint10). Which of the following is responsible for moving electricity from power plants to local substations? Distribution Transmission Both a and b None of the above None Hint11). What is a converter station in an HVDC system? A station that converts AC to DC A station that converts DC to AC A station that regulates the voltage of the transmission line A station that monitors the transmission line for faults None Hint12). Which of the following is not a type of HVDC transmission system? Line-commutated converter (LCC) system Voltage-source converter (VSC) system Current-source converter (CSC) system Phase-commutated converter (PCC) system None Hint13). Which of the following is a type of HVDC cable? XLPE cable PILC cable PVC cable Paper-insulated lead-covered cable None Hint14). What does UHVDC stand for? Ultra High Voltage Direct Current Ultra High Velocity Direct Current Ultra High Voltage Distribution Current Ultra High Frequency Direct Current None Hint15). What is the typical voltage level of a UHVDC transmission system? 500-1000 kV 1000-2000 kV 2000-3000 kV 3000-4000 kV None Hint16). What is the main challenge associated with UHVDC technology? High cost Technical complexity Environmental impact Safety concerns None Hint17). Which country was the first to develop and deploy UHVDC technology? China Japan United States Germany None Hint18). What is the typical transmission capacity of a UHVDC transmission line? 1000-2000 MW 2000-4000 MW 4000-6000 MW 6000-8000 MW None Hint19). What is the maximum transmission distance achieved by a UHVDC transmission line to date? 1000 km 2000 km 3000 km 4000 km None Hint20). What is the voltage level of electricity typically used for transmission? High voltage Low voltage Medium voltage None of the above None Hint21). What is the primary component of a UHVDC transmission system? Transformer Circuit breaker Converter station Insulator None Hint22). A power plant generates 10 MW of power at 25 kV. If the power is to be transmitted over a distance of 100 km to a substation, what is the minimum voltage level that should be used to minimize power loss? 25 kV 50 kV 100 kV 500 kV None Hint23). A substation receives power at 500 kV and is responsible for distributing it to individual consumers at 12 kV. If the substation is located 10 km from the consumers, what size of transformer is needed to step down the voltage to 12 kV? 40 kVA 4167 kVA 50,000 kVA 500,000 kVA None Hint24). A distribution system experiences a voltage drop of 5% between the substation and a consumer's home due to the resistance of the power lines. If the voltage at the substation is 120 V, what is the voltage at the consumer's home? 114 V 118 V 123 V 126 V None Hint25). A transmission line experiences a power loss of 10 MW when transmitting 100 MW of power over a distance of 200 km. What is the power loss per kilometer of the transmission line? 5 kW/km 25 kW/km 50 kW/km 100 kW/km None HintTransmission Distribution MCQ for Quiz26). What is the maximum amount of power that can be transmitted over a power line with a voltage of 500 kV and a current of 1000 A? 500 MW 5000 MW 50,000 MW 500,000 MW None Hint27). A power plant generates electricity at a voltage of 20 kV and a power output of 100 MW. If the power is transmitted over a distance of 100 km using a transmission line with a resistance of 0.5 Ω/km, what is the voltage at the receiving end of the line? 20 kV 15.7 kV 10 kV 5.7 kV None Hint28). A distribution line has a voltage of 12 kV and a length of 5 km. If the line has a resistance of 0.2 Ω/km and a load of 1000 kW is connected to the end of the line, what is the voltage at the end of the line? 11.3 kV 10.8 kV 10.3 kV 9.8 kV None Hint29). A distribution line has a voltage of 4160 V and a length of 2 miles. If the line has a resistance of 0.2 Ω/mile and a load of 500 kW is connected to the end of the line, what is the voltage at the end of the line? 3835 V 3760 V 3685 3610 V None Hint30). Which of the following is typically used for reducing the voltage of electricity in distribution systems? HVDC lines HVAC lines Transformers None of the above None Hint31). What is the main difference between HVAC and HVDC? The type of current used The voltage level used The frequency of the current used The type of equipment used None Hint32). Which of the following is an advantage of HVDC over HVAC? Lower transmission losses Lower equipment cost Higher voltage levels Greater system stability None Hint33). Which of the following is a disadvantage of HVDC compared to HVAC? Higher transmission losses Higher equipment cost Lower voltage levels Less system stability None Hint34). What is the typical frequency of power used in AC power systems? 50 Hz or 60 Hz 100 Hz or 120 Hz 200 Hz or 240 Hz 400 Hz or 480 Hz None Hint35). What is the typical voltage level used in high-voltage power transmission systems? 120 V 240 V 1 kV 100 kV or higher None Hint36). Which of the following materials is commonly used for overhead transmission and distribution lines? Copper Aluminum Silver Gold None Hint37). In a power system single-line diagram, what does a circle represent? A generator A transformer A transmission line A busbar None Hint38). Which of the following is NOT a common probability distribution? Normal distribution Poisson distribution Binomial distribution Linear distribution None Hint39). Which of the following is true about the mean of a normal distribution? It is always zero It is always positive It is always negative It can be any real number None Hint40). Which of the following is responsible for delivering lower-voltage electricity from local substations to individual consumers? Transmission Distribution Both a and b None of the above None Hint41). Which type of power line is typically used for transmission over long distances? Low-voltage power lines Medium-voltage power lines High-voltage direct current lines High-voltage alternating current lines None Hint42). Which type of power line is typically used for distribution to individual consumers? Low-voltage power lines Medium-voltage power lines High-voltage direct current lines High-voltage alternating current lines None Hint43). Which of the following is responsible for minimizing the loss of electrical energy during transmission over long distances? Transformers High-voltage direct current lines Low-voltage power lines None of the above None Hint44). Which of the following is not a component of the transmission system? Power plants High-voltage power lines Transformers Medium-voltage power lines None Hint45). Which of the following is not a component of the distribution system? Transformers Medium-voltage power lines Low-voltage power lines High-voltage power lines None Hint46). Which of the following is true regarding high-voltage direct current lines? They are more efficient for transmitting electricity over long distances than HVAC lines They are more efficient for transmitting electricity over short distances than HVAC lines They are less reliable than HVAC lines None Hint47). Which of the following is true regarding the use of transformers in the electrical power system? They are used to increase the voltage of electricity during transmission They are used to decrease the voltage of electricity during distribution They are used to increase the voltage of electricity during distribution They are not used in the electrical power system None Hint48). Which of the following is true regarding the reliability of the electrical power system? Reliability is only affected by the generation of electricity Reliability is only affected by the transmission of electricity Reliability is only affected by the distribution of electricity Reliability is affected by all components of the electrical power system None Hint49). Which of the following is a component of the transmission system? Medium-voltage power lines Transformers High-voltage direct current lines None of the above None Hint50). Which of the following is a component of the distribution system? Low-voltage power lines High-voltage alternating current lines Substations All of the above None HintTransmission Distribution MCQ for Exams51). Which of the following is a typical application of HVDC technology? Power transmission over long distances Power distribution within a city Power generation from renewable sources None of the above None Hint52). What is the advantage of HVDC over HVAC for long distance power transmission? Higher transmission efficiency Lower transmission losses Lower transmission cost All of the above None Hint53). Which of the following is NOT a type of HVDC converter? LCC VSC MCC UHVDC None Hint54). What is the typical voltage range for HVDC transmission? 50-100 kV 100-500 kV 500-1000 kV 1000-2000 kV None Hint55). Which of the following is a disadvantage of HVDC transmission? Higher initial cost Limited transmission distance Higher maintenance cost None of the above None Hint56). What is the primary component of an HVDC transmission system? Transformer Circuit breaker Converter station Insulator None Hint57). Which of the following is a potential benefit of using HVDC for renewable energy integration? Smaller converter stations Increased transmission distance Higher transmission efficiency All of the above None Hint58). What is the typical transmission capacity of an HVDC line? 100-500 MW 500-1000 MW 1000-5000 MW 5000-10000 MW None Hint59). What is the main advantage of UHVDC over traditional HVDC? Higher transmission efficiency Lower transmission losses Longer transmission distance All of the above None Hint60). Which of the following distributions is used to model the number of successes in a fixed number of independent trials? Poisson distribution Normal distribution Binomial distribution Exponential distribution None Hint61). Which of the following distributions is used to model the time between independent events occurring at a constant rate? Poisson distribution Normal distribution Exponential distribution Uniform distribution None Hint62). Which of the following is true about the standard deviation of a normal distribution? It is always zero It is always positive It is always negative It can be any real number None Hint63). Which of the following distributions is used to model rare events? Poisson distribution Normal distribution Binomial distribution Exponential distribution None Hint64). Which of the following distributions is used to model the outcome of a continuous random variable? Poisson distribution Normal distribution Binomial distribution Geometric distribution None Hint65). Which of the following is true about the probability density function (PDF) of a continuous distribution? It can take on negative values It is always positive It is always zero It can be any real number None Hint66). Which of the following distributions is used to model the amount of time until a specific event occurs? Poisson distribution Normal distribution Binomial distribution Weibull distribution None Hint67). Which of the following is NOT a common application of the Weibull distribution? Reliability engineering Failure analysis Survival analysis Binomial regression None Hint68). Which of the following parameters of the Weibull distribution determines the shape of the distribution? Scale parameter Shape parameter Location parameter Probability parameter None Hint69). What is the range of possible values for the shape parameter of the Weibull distribution? Any positive real number Any non-negative real number Any real number Any integer None Hint70). Which of the following is true about the Weibull distribution when the shape parameter is less than 1? The distribution is symmetric The distribution is skewed to the left The distribution is skewed to the right The distribution is bimodal None Hint71). What is the characteristic impedance of a transmission line? The impedance of the line at any point The impedance of the line at the input end The impedance of the line at the output end The impedance that would make the line appear infinitely long None Hint72). What is the velocity factor of a transmission line? The ratio of the speed of light to the speed of electricity in the line The ratio of the effective propagation speed to the speed of light The ratio of the effective propagation speed to the speed of electricity in the line The ratio of the voltage to the current in the line None Hint73). What is the primary reason for using a transmission line? To reduce the amount of noise in a circuit To increase the bandwidth of a circuit To increase the power output of a circuit To prevent reflections from occurring in a circuit None Hint74). What is the purpose of a matching network in a transmission line? To ensure that the impedance of the line is the same at both ends To reduce the power loss in the line To increase the bandwidth of the line To reduce the amount of noise in the line None Hint75). What is the unit of measurement for characteristic impedance? Ohm Henry Farad Siemens None HintTransmission Distribution MCQ for Interviews76). What is the formula for calculating the velocity factor of a transmission line? vf = c/2f vf = c/f vf = 2f/c vf = f/c None Hint77). What is the main difference between distribution and transmission lines? The voltage level carried by the lines The location of the lines The type of insulation used The material used for the lines None Hint78). What voltage level is typically used for distribution lines? Less than 10 kV Between 10 kV and 100 kV Between 100 kV and 500 kV Greater than 500 kV None Hint79). What is the formula for calculating the characteristic impedance of a transmission line? Z0 = sqrt(L/C) Z0 = L/C Z0 = sqrt(C/L) Z0 = C/L None Hint80). Which of the following is true about the Weibull distribution when the shape parameter is greater than 1? The distribution is symmetric The distribution is skewed to the left The distribution is skewed to the right The distribution is bimodal None Hint81). A 3-phase transmission line has a length of 300 km and a resistance of 0.2 Ω per phase. If the line is operating at a voltage of 220 kV and a current of 1000 A, what is the total power loss in the line? 8.4 MW 18.4 MW 28.4 MW 38.4 MW None Hint82). A distribution transformer has a rated power of 500 kVA, a rated voltage of 12 kV/240 V, and a rated efficiency of 98%. If the transformer is loaded to its full rated power, what is the primary current? 21.43 A 208.33 A 416.67 A 833.33 A None Hint83). A 3-phase distribution line has a length of 5 km and a resistance of 0.02 Ω per phase. If the line is operating at a voltage of 11 kV and a current of 400 A, what is the voltage drop in the line? 0.44 V 4.4 V 44 V 440 V None Hint84). A 3-phase transmission line has a length of 50 km and a capacitance of 0.02 μF per phase. If the line is operating at a voltage of 132 kV, what is the total reactive power in the line due to capacitance? 220 kVAr 440 kVAr 880 kVAr 1760 kVAr None Hint85). A 3-phase transmission line has a length of 100 km and a resistance of 0.2 Ω per phase. If the line is operating at a voltage of 400 kV and a power factor of 0.9, what is the minimum size of capacitor required at the receiving end to correct the power factor to unity? 22.2 Mvar 44.4 Mvar 88.8 Mva 177.6 Mvar None Hint86). What is the primary purpose of a transmission line in an electrical power system? To distribute electrical power to end-users To reduce the voltage level of electrical power To transmit electrical power over long distances with minimum losses To connect electrical power generation plants to the grid None Hint87). Which of the following is a type of distribution system commonly used in urban areas? adial distribution system Primary distribution system Secondary distribution system Ring main distribution system None Hint88). What is the primary function of a transformer in an electrical power system? To convert electrical energy into mechanical energy To convert high voltage to low voltage or vice versa To store electrical energy d. To regulate the frequency of electrical power None Hint89). What is the primary advantage of underground distribution systems over overhead distribution systems? Lower installation and maintenance costs Higher reliability and lower outage rates Better resistance to lightning strikes and other weather-related events Higher voltage levels and lower losses None Hint90). Which of the following is a common protective device used in electrical power systems to isolate a fault? Fuse Circuit breaker Transformer Capacitor None Hint91). What is the tripping mechanism of a circuit breaker? Magnetic Thermal Both A and B None of the above None Hint92). Which of the following is NOT a type of circuit breaker? hermal circuit breaker Magnetic circuit breaker Vacuum circuit breaker Hydraulic circuit breaker None Hint93). Which of the following is a common type of fault in electrical power systems? Open circuit Short circuit Overvoltage Undervoltage None Hint94). What type of fault is a circuit breaker designed to protect against? Open circuit Closed circuit Overload Resistance None Hint95). What is the main purpose of a circuit breaker? To conduct electricity To protect an electrical circuit from damage To measure electrical current To increase electrical voltage None Hint96). What is the most common cause of power outages on a distribution system? Lightning strikes Human error Equipment failure None Hint97). What is the main advantage of using underground cables for distribution? Lower cost Higher reliability Greater flexibility Easier maintenance None Hint98). What is the main disadvantage of using overhead lines for distribution? Higher cost Greater susceptibility to damage from weather Higher maintenance requirements Lower efficiency None Hint99). What is the most common method used to protect transmission lines from lightning strikes? Grounding Shielding Insulating Surge arresters None Hint100). What is the purpose of a transformer in a distribution system? To regulate voltage To regulate frequency To regulate current To provide power factor correction None HintRead more about Transmission Line Time's up
