What is the function of a circuit breaker in a power system?
A Power regulation
B Fault isolation
C Power storage
D Power generation
Circuit breakers are used to protect electrical circuits by detecting faults and isolating the affected section. This prevents damage to the system and allows safe maintenance and repair during faults.
What does a busbar do in a power substation?
A Fault detection
B Voltage regulation
C Power conversion
D Power distribution
A busbar is a conductive material used in substations to collect and distribute electrical power from different sources to different outgoing circuits, ensuring efficient power flow throughout the system.
Which of the following is a renewable energy source integrated into power systems?
A Coal
B Solar
C Oil
D Gas
Solar energy is a renewable energy source integrated into power systems. It is harnessed through photovoltaic cells or solar thermal systems, contributing to clean, sustainable electricity generation.
What is the purpose of reactive power in an electrical grid?
A Energy storage
B Power loss
C Voltage stabilization
D Power generation
Reactive power does not perform useful work but is necessary for voltage stabilization in the grid. It supports the operation of inductive loads like motors and transformers by maintaining voltage levels.
What is the main role of a generator in a power system?
A Power distribution
B Power generation
C Power regulation
D Power storage
Generators convert mechanical energy into electrical energy, serving as the primary source of power generation in most power systems. They provide the electrical energy required for transmission and distribution.
What is the function of a step-up transformer in a power system?
A Power generation
B Voltage regulation
C Power distribution
D Voltage increase
A step-up transformer increases the voltage from the generation side, allowing for efficient transmission of electricity over long distances. Higher voltage reduces losses during transmission.
What is fault analysis used for in a power system?
A Optimizing energy storage
B Voltage regulation
C Identifying system failures
D Power quality improvement
Fault analysis helps identify and isolate faults in a power system. It helps determine the type, location, and cause of faults, ensuring quick action to minimize system damage and prevent outages.
What is the purpose of frequency control in power systems?
A Fault isolation
B System stability
C Voltage regulation
D Power distribution
Frequency control maintains the balance between power generation and load. It is crucial to ensure system stability, as any significant frequency deviation can damage equipment or lead to system failure.
What does the term ‘demand-side management’ refer to in power systems?
A Regulating transmission lines
B Managing energy storage
C Reducing power generation
D Controlling electricity consumption
Demand-side management refers to strategies and technologies used to control and reduce electricity consumption, particularly during peak hours. It helps optimize energy use, reduce costs, and enhance grid stability.
What is grid resilience in power systems?
A Power loss reduction
B Backup power generation
C Power quality improvement
D Ability to withstand disruptions
Grid resilience refers to the power system’s ability to anticipate, absorb, and recover from disruptions such as natural disasters, cyber attacks, or equipment failures, ensuring continued service and rapid recovery.
What is the purpose of power factor correction in a power system?
A Improve system stability
B Maintain voltage
C Reduce energy consumption
D Increase energy production
Power factor correction improves system stability by reducing the phase difference between voltage and current. It helps prevent inefficiencies caused by inductive loads and reduces losses in transmission lines.
What is the function of a capacitor bank in a power system?
A Power generation
B Voltage regulation
C Fault detection
D Energy storage
Capacitor banks provide reactive power to the grid, helping to maintain voltage levels and improving the power factor. They stabilize voltage and support the operation of inductive loads like motors and transformers.
What is the role of energy management systems (EMS) in power grids?
A Monitor energy use
B Forecast demand
C Manage energy storage
D Control energy prices
Energy management systems (EMS) monitor, control, and optimize the generation, transmission, and distribution of electrical power. EMS help reduce energy consumption, improve grid efficiency, and enhance reliability.
What is the primary function of a voltage regulator in a power system?
A Fault protection
B Maintain voltage
C Voltage control
D Power generation
A voltage regulator is used to maintain constant voltage levels within the power system. It automatically adjusts the output voltage to ensure that it remains stable despite changes in load or input.
What does ‘economic load dispatch’ aim to optimize in power systems?
A Power generation cost
B Voltage levels
C Frequency regulation
D Power transmission efficiency
Economic load dispatch aims to optimize the distribution of load among multiple power plants to minimize the total generation cost while meeting the demand. It ensures the most cost efficient combination of generation units.