Power Plant Operations and Maintenance

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What is the typical voltage range of distribution feeders?

66-132 kV
33-66 kV
0.3-3.3 kV
3.3-33 kV (correct)

What is the primary function of transformers in the power system?

To change the voltage and current levels of the power flow (correct)
To provide safety through switching and protection
To transmit power from one location to another
To regulate voltage within an acceptable range

What is the advantage of interconnection in terms of spare capacity?

It enables the sharing of spare capacity, resulting in reduced costs (correct)
It is only necessary for steam-driven plants
It allows for the operation of smaller generating stations
It increases the overall capital and operating costs

What is the main factor that determines the capacity of power lines?

The current-carrying capacity of the conductor (A) Signup and view all the answers

What is the primary reason for having excess capacity in a power generation system?

To provide power in the event of a generator breakdown or maintenance outage (D) Signup and view all the answers

What is the merit order listing used for in power generation?

To determine the order in which generating stations are operated to achieve the cheapest electricity (B) Signup and view all the answers

Why is it necessary for spare generating capacity to operate as spinning reserve in steam-driven plants?

Because steam-driven plants cannot start up from cold quickly in an emergency (B) Signup and view all the answers

What is the relationship between the net installed capacity of each level and the distance from the consumer?

It increases as one moves towards the consumer (B) Signup and view all the answers

What is the optimal operating condition for generating plant to achieve cheaper electricity?

Operating large stations under optimum conditions and in the optimum configuration (C) Signup and view all the answers

What is the total capacity range of distribution feeders?

2-35 MW (C) Signup and view all the answers

What is the main disadvantage of thermal generating stations?

They are subject to the laws of thermodynamics, which limit their efficiency (B) Signup and view all the answers

What happens to voltage drop and power losses in power lines as the load increases?

They increase in direct proportion to the load (B) Signup and view all the answers

What is the main purpose of a transmission system in an electric power system?

To transport large amounts of power over long distances (D) Signup and view all the answers

What is the primary concern in power generation?

Achieving the lowest possible energy cost (A) Signup and view all the answers

What is the main component of an electric power system that delivers electrical energy from a transmission substation to customers?

Distribution (D) Signup and view all the answers

What is the typical voltage range for transmission lines in European countries?

300, 400, 500, and 750 kV (A) Signup and view all the answers

What is the function of a sub-transmission system?

To reduce the voltage for distribution (B) Signup and view all the answers

What is one of the main environmental issues associated with power generation?

All of the above (D) Signup and view all the answers