1. What are the main components of a power system? Answer: A power system is composed of several key parts, including the power plant where electricity is generated, transmission and distribution lines that carry the electricity over long distances, substations that step up or step down the voltage for efficient delivery, and end-user units such as homes, industries, and businesses that consume the electricity. 2. What is meant by the term "power grid"? Answer: The power grid refers to the network that connects the various elements of the power system, specifically the power transmission, transformation, and distribution systems. It ensures that electricity is efficiently delivered from the generation source to the consumers. 3. What are the advantages of a large power system? Answer: 1) Enhanced power supply reliability, as the system can better handle fluctuations and failures. 2) Reduced need for spare capacity since the system can share resources across different regions. 3) More efficient load distribution, which helps in balancing the demand and supply. 4) Improved power quality through better regulation and control. 5) Facilitates the use of large-scale power resources, especially hydropower, by allowing more flexible and efficient utilization of energy sources. 4. What are the characteristics of electricity production? Answer: (1) Simultaneity – electricity must be produced and consumed at the same time. (2) Concentration – generation is typically centralized in power plants. (3) Applicability – electricity is versatile and can be used in various applications. (4) Preemptiveness – planning and forecasting are essential due to the difficulty of storing large amounts of electricity. "The above is the added content."
Sample Exam Questions (Multiple Choice – Only one correct answer) 1. The power network consists of (A) A. Power transmission, substation, power distribution B. Power generation, power transmission, substation C. Power plant, transformer, consumer D. None of the above 2. Using electricity in a more reasonable way is associated with (B) A. A larger difference between peak and valley loads B. A smaller difference between peak and valley loads C. Unbalanced load distribution D. Increased energy waste 3. If the voltage is too low, it may cause an asynchronous motor to (C). A. Vibrate B. Experience insulation damage C. Burn out D. Operate more efficiently 4. When a short circuit occurs, it is characterized by (C). A. High voltage B. Small current C. Large current D. No current flow 5. The closing current of a circuit breaker refers to (C) passing through the circuit breaker contacts. A. Normal current B. Load current C. Maximum short-circuit current that the circuit breaker is allowed to interrupt D. Rated current
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