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WorksheetsCh 5 EPO460 Part 5a Quiz
Total questions: 30
Worksheet time: 15mins
Why must electricity be generated continuously?
It is expensive to store
It is non-renewable
It cannot be stored in bulk form
It loses power quickly
Which of the following is the most polluting energy source?
Water
Coal
Natural gas
Nuclear
What causes continuous increase in power demand?
Ageing population
Higher education level
More technology
Population growth and industrial expansion
What is a main disadvantage of using natural gas?
High emission
Difficult to store
Hard to transport over long distances
Expensive fuel
Why are renewable energy sources still limited in use?
No government support
Not enough researchers
Too many safety issues
Not economical yet
Which of the following is not part of a power system?
Generation
Lighting
Transmission
Distribution
What is the typical voltage range of generated power at stations?
220V-415V
132kV-500kV
11kV-25kV
3.3kV-33kV
What is the role of a base-power station?
Operate during peak hours
Provide backup power
Supply power continuously 24/7
Supply power only in emergencies
What is a disadvantage of peak-power stations?
They are very reliable
They cost less to run
They cannot start quickly
They have high operating costs
Which type of power station is suitable for handling quick demand changes?
Base-power
Intermediate-power
Nuclear
Renewable
What is the purpose of high transmission voltage?
Easier to generate
Improve reliability
Minimise losses and cost
Reduce noise
What voltage class is 132kV to 500kV?
Low voltage
Medium voltage
High voltage
Extra low voltage
HVDC is used when:
Voltages are too low
Lines are underground
AC systems are synchronised
Distance is more than 600 km
Which substation connects different countries' power systems?
Distribution
Conversion
Interconnecting
Transmission
What is the function of a transmission substation?
Supply electricity to homes
Convert voltages to very high for long-distance transfer
Protect against faults
Generate power
Final consumer voltage for 3-phase supply is:
240V
415V
11kV
6.6kV
Which type of network is more reliable in case of fault?
Radial
Ring
Linear
Parallel
Radial networks are commonly used in:
Small homes
Remote areas
High-rise buildings and shopping malls
Hospitals
What is a drawback of a radial network?
High cost
Easy to install
Unreliable during interruptions
Too many cables
What advantage does a ring network have?
Cheaper setup
Always uses solar
Easier to re-route power during breakdown
Simpler maintenance
What is a key benefit of grid systems?
Less power needed
Reduced safety risk
Greater stability
Easier wiring
If one generator fails, how does the grid system help?
Increases the load
System shuts down
Other stations continue supply
Switches to diesel backup
What is the name of the grid in Peninsular Malaysia?
Sabah Grid
Sarawak Grid
National Grid
ASEAN Grid
Who operates the National Grid?
SESCO
SESB
Petronas
Tenaga Nasional Berhad (TNB)
Why is grid operation more economical?
All stations run all the time
Load can be shared to reduce cost
No need for substations
No maintenance is required
What is a load-flow study used for?
Installing solar panels
Fixing broken wires
Analysing power system in steady state
Forecasting weather
What is a "bus" in a power station?
A backup generator
A point where power is converted
A common connection point for generators
A communication link
What is specified at a PQ bus?
Voltage and current
Power and current
Real and reactive power
Phase and angle
Which bus acts as the system reference?
PQ bus
PV bus
Swing bus
Load bus
Which quantity is NOT associated with each bus?
Voltage magnitude
Phase angle
Frequency
Reactive power
