Power System MCQs (Part-4)

What is the main purpose of power transmission lines?

A Convert mechanical energy to electrical energy
B Deliver electricity from generation stations to distribution networks
C Step up the voltage for household use
D Provide backup power during faults

What is the unit of electrical power?

A Volt
B Watt
C Ohm
D Ampere

What is the purpose of switchgear in a power system?

A Transmit power over long distances
B Protect electrical equipment from damage during faults
C Reduce voltage for household usage
D Measure power factor

What type of transformer is used to reduce the voltage in a distribution network?

A Step-up transformer
B Step-down transformer
C Isolation transformer
D Auto-transformer

What is the main advantage of underground power cables over overhead transmission lines?

A Higher voltage capacity
B Lower installation costs
C Protection from weather-related damage
D Reduced maintenance requirements

What is “load shedding”?

A Disconnecting non-essential loads during supply shortages
B Increasing the frequency of the power system
C Reducing transmission losses
D Improving grid efficiency

What is the role of a power distribution network?

A Generate electricity from renewable sources
B Deliver electricity to end consumers
C Transmit power over long distances
D Store electrical energy for peak demand

What is the primary purpose of a load flow study?

A Determine the cost of electricity generation
B Analyze the steady-state performance of the power system
C Protect the system from faults
D Manage blackout recovery

What does “power system stability” refer to?

A The system’s ability to operate under heavy faults
B The system’s capability to maintain equilibrium during disturbances
C The reduction of transmission losses
D The increase of system frequency

What type of protection system uses relays and circuit breakers?

A Mechanical protection
B Electrical protection
C Hydraulic protection
D Thermal protection

Which type of fault is the most severe in a power system?

A Line-to-ground fault
B Double line-to-ground fault
C Line-to-line fault
D Three-phase fault

What is “economic load dispatch”?

A Balancing the load across transmission lines
B Optimizing generator output to minimize cost
C Reducing reactive power
D Controlling load shedding

What is the function of a surge protector?

A Step up voltage
B Protect equipment from voltage spikes
C Maintain frequency stability
D Reduce power losses

What does “frequency control” ensure in a power system?

A Voltage remains constant
B Current remains constant
C Power supply is synchronized with demand
D Load is evenly distributed

What is the purpose of a current transformer (CT)?

A Step up voltage
B Step down current for measurement
C Isolate faults in the system
D Generate electricity

What is meant by “fault analysis” in power systems?

A Identifying locations of power generation
B Analyzing abnormal conditions in the system
C Reducing voltage drop in transmission lines
D Increasing system efficiency

What is the advantage of renewable energy integration into the grid?

A Reduces dependency on fossil fuels
B Increases the need for load shedding
C Reduces grid stability
D Decreases the systemโ€™s efficiency

What is “power quality” in a power system?

A Efficiency of the generation units
B Reliability of power delivery to consumers
C Consistency of voltage, frequency, and waveform
D Reduction of power losses in transmission

Which device is used to measure electrical power in a circuit?

A Ammeter
B Voltmeter
C Wattmeter
D Ohmmeter

What is the purpose of energy management systems (EMS) in power systems?

A Store excess energy during peak hours
B Optimize energy usage and reduce costs
C Reduce the frequency of power outages
D Generate renewable energy