WorksheetsElectrical Engineering Quiz
Total questions: 100
Worksheet time: 50mins
What is the main focus of the electrical engineering field?
Technology
Manufacturing
Processing
Recycling
Which of the following is a task of electrical engineering?
Research and creation of suitable wire types for different regions
Cooking food for large groups
Designing clothing for various climates
Building bridges for transportation
What is involved in the production of electricity?
Converting various forms of energy into electrical energy
Painting electrical wires
Growing crops for energy
Writing software for mobile phones
Which process is part of electricity transmission and distribution?
Limiting chemical reactions during electricity use
Creating electricity by converting other forms of energy
Using devices to control the conversion of electricity into other forms of energy for production and life
All of the above
What is the use of electrical materials?
Using polymer materials to optimize product costs and reduce fire risks
Making food packaging
Building roads
Designing furniture
What is a role of electrical engineering in production and life?
Promoting the development of agriculture and services
Limiting plastic waste pollution
Making toys for children
Organizing sports events
How does electrical engineering improve quality of life?
Improving the average life expectancy of people
Increasing the number of pets
Reducing the amount of homework
Lowering the price of food
What is a mission of researching, exploiting, and developing renewable energy sources?
Developing smart grids and optimal control systems
Building new shopping malls
Creating new sports teams
Designing new fashion trends
What is a task in creating smart power grids integrated with automatic measurement and control systems?
Developing new materials for electrical engineering
Building new schools
Planting more trees
Organizing music festivals
Which of the following is NOT a role of the components and electrical devices in the power system?
Power generation
Transmission and distribution of electricity
Manufacturing components
Electricity usage
Research, development, and application of new materials is a task of:
Developing new materials for electrical engineering
Developing smart power grids
Developing renewable energy power generation
Developing smart factories and optimal control
Strengthening the connection of electrical devices in smart factory ecosystems and implementing control programs is a task of:
Developing new materials for electrical engineering
Developing smart factory ecosystems and optimal control
Developing renewable energy power generation
Developing smart power grids
The development of renewable energy power generation aims to:
Optimize transmission, distribution, and usage of electricity; develop energy storage systems
Reduce dependence on fossil fuels, decrease greenhouse gas emissions in power generation
Create more efficient electrical devices, save energy, and be environmentally friendly
Increase management, monitoring, productivity, and reduce costs
Developing smart power grids aims to:
Reduce dependence on fossil fuels, decrease greenhouse gas emissions in power generation
Create more efficient electrical devices, save energy
Optimize transmission, distribution, and usage of electricity; develop energy storage systems
Increase convenience, safety, and friendliness
Developing new materials for electrical engineering aims to:
Create more efficient electrical devices, save energy, and be environmentally friendly
Promote agricultural development
Increase productivity and quality of products
Develop electrical system protection devices
Developing smart home devices and energy-saving devices aims to:
Raise public awareness about environmental pollution
Create a foundation for developing energy storage power plants
Encourage business investment in related fields
Increase convenience, safety, and friendliness
According to regulations, the homeland of A requires the construction of power plants using wind and solar energy to:
Develop smart power grids
Develop smart energy usage systems
Develop renewable energy power generation
Develop smart machinery
What is Anh H doing in the experiment to create a new fireproof material for household electrical devices?
Producing electricity from renewable energy sources
Testing the physical and chemical properties of the new material
Developing new materials for electrical engineering
Optimizing the electricity production process
Observe the image and state the role of electrical components and devices in the electrical system?
Electricity production
Electricity transmission and distribution
Electricity usage
Developing the electrical system
Observe the image and state the role of electrical components and devices in the electrical system?
Electricity usage
Electricity production
Developing the electrical network system
Electricity transmission and distribution
Why is electrical energy considered the main energy source for production?
Because most machines and electrical devices used in production utilize electrical energy to convert it into other forms of energy for the production process
Because electrical devices play an important role in production, replacing humans partially or entirely to perform tasks that help increase productivity and product quality
Because electrical engineering plays a central role in control systems to optimize and automate the production process
Because electrical machines and devices are monitored to help managers control the progress and production plans
When using a rice cooker to cook rice, what form of energy has electrical energy been converted into?
Potential energy
Kinetic energy
Dynamic energy
Thermal energy
What is the product of electrical design work?
Construction drawings with circuit diagrams and corresponding electrical devices
Circuit diagram drawings and content of directives, organizing the operation of the electrical system
Circuit diagram drawings and technical documents describing the electrical system
Operational electrical drawings
What educational level is required for an electrical operation engineer?
Intermediate vocational level in electrical engineering
College level in electrical engineering
Basic vocational level in electrical engineering
University level in electrical engineering
Which profession works in the technical departments of companies providing electrical consulting and design services?
Electrical designer
Manufacturing and producing electrical equipment
Electrical installation
Electrical operation
Electrical maintenance is an activity that
is periodic to maintain the electrical system and equipment in normal operation, preventing malfunctions
is performed when there is an incident to restore the electrical system and equipment to normal operation
involves installing and connecting electrical lines and equipment for electrical systems and projects
is to maintain the normal working condition of the electrical system
What is the role of an electrician in maintenance and repair of electrical systems?
Determine the maintenance and repair methods for electrical systems
Perform maintenance and repair of electrical systems
Supervise and carry out maintenance and repair activities for electrical systems
Construct and install electrical systems
Which profession requires a thorough understanding of technical parameters and operating procedures of electrical systems and equipment?
Electrical designer
Manufacturing and producing electrical equipment
Electrical operation
Maintenance and repair of electrical systems
Why is it crucial for electrical engineers to have a solid understanding of electrical safety knowledge?
To work efficiently and achieve high productivity
To protect themselves and those around them from the risk of electric shock and fire
To easily advance in their careers
To reduce repair costs for equipment
What job can an electrical engineer working in the field of electrical-electronics undertake?
Construct roads and civil engineering works
Design integrated circuits and smart electronic devices
Operate mechanical machinery in factories and ensure the electricity consumption for the factory
Survey trends in electricity usage and conserve natural resources
What is the unit of angular velocity of electric current?
rad
rad/s
m/s
s
In a three-phase alternating current system with the same frequency, the same amplitude, and a phase shift angle of
30°
60°
90°
120°
The rotor of a three-phase generator is made from
steel core with grooves
permanent magnet
electromagnet
coil
Which of the following is NOT a way to connect a three-phase power source?
Star connection
Delta connection
Square connection
Y connection
Iₐ in a three-phase circuit is the symbol of which quantity?
Current flowing in each phase
Current flowing in the phase wire
Voltage between two phase wires
Voltage between the start and end points of each phase
The figure below shows which type of three-phase source and load connection?
Star connection without neutral wire
Star connection with neutral wire
Star and delta connection
Delta connection
When connected in star, what is the relationship between line voltage and phase voltage?
U_d = U_p
U_d = √3 × U_p
U_p = √3 × U_d
U_d = U_p / 3
When connected in delta, what is the relationship between line current and phase current?
I_d = I_p
I_d = √3 × I_p
I_p = √3 × I_d
I_d = 3 × I_p
In a three-phase circuit, what does symmetrical load mean?
The phases have equal resistance
The currents in the phases are different
The voltages in the phases are 180° out of phase
Only one phase carries the load
In a three-phase circuit, what is the function of the neutral wire?
Transmit main power
Stabilize the voltages of the phases
Increase line voltage
Reduce phase current
A three-phase star-connected circuit has a line voltage of 380V. What is the phase voltage?
220 V
380 V
110 V
660 V
A three-phase delta-connected load has a line current of 10 A. What is the phase current?
5.8 A
10 A
17.3 A
20 A
In practice, why does the national electricity system often use three-phase circuits?
Reduce energy loss and save materials
Increase current on the transmission line
More complex structure makes automation easier
Not suitable for transmitting large power
When one phase of a three-phase circuit loses power (wire breaks), what is the consequence?
The motor still operates normally
The motor vibrates, overheats, and may burn
Current increases evenly in all phases
Efficiency increases
What type of electrical network do the electrical systems in factories, enterprises, and residential areas belong to?
Distribution network
Transmission network
Consumption network
Utility network
Which of the following components are included in an electric power system?
Power source and consumers
Power source, grid, and consumers
Conductors and substations
Conductors, substations, and consumers
What is the function of the national power grid?
Transmit and distribute electricity from power plants to consumers
Increase voltage
Decrease voltage
Connect wires and substations together
Which functions does the national power system perform?
Generate, transmit, and distribute electricity
Transmit and distribute electricity
Generate, transmit, distribute, and consume electricity
Transmit, distribute, and consume electricity
What is the main function of the national power grid?
Generate electricity
Distribute electricity to consumers
Consume electricity
Transmit and distribute electricity from power plants to consumers
Which of the following best describes the components of the national power grid?
Power lines and consumers
Power lines and switching substations
Power lines and transformer substations
Power lines and transformer substations
How do the components of the national power system relate to each other?
They are interconnected and affect each other
They operate completely independently
They do not affect each other
They are separated and managed independently
Why is high voltage used for long-distance power transmission?
To reduce current loss and save materials, improving transmission efficiency
To increase power loss and save materials, improving transmission efficiency
To heat wires, save materials, and improve transmission efficiency
To reduce power, save materials, and improve transmission efficiency
If a local power system in a commune experiences a major outage, what is the best solution?
Isolate the affected area for repairs, maintain partial operation
Shut down the entire system for repairs
No need to handle, no major impact
Increase voltage to supply more power to the affected area
If the transmission voltage is doubled but the power remains the same, what happens to the current in the transmission line?
Halved
Doubled
Unchanged
Reduced to one-fourth
Which of the following is a renewable energy source used for electricity production?
Coal
Oil
Ocean waves
Natural gas
Which of the following is NOT a renewable energy source used for electricity production?
Water
Oil
Sunlight
Wind
What is the process of electricity production?
The process of converting other forms of energy into heat energy
The process of converting other forms of energy into electrical energy
The process of converting electrical energy into other forms of energy
The process of converting heat energy into other forms of energy
Which is an advantage of hydroelectric power plants?
No greenhouse gas emissions
High initial investment cost
Short construction time
Not dependent on weather conditions
Which is a disadvantage of hydroelectric power plants?
Power output depends on the amount of water stored in reservoirs
Emission of greenhouse gases
High operating costs
Small power output
Which is an advantage of thermal power plants?
Low initial investment cost
No greenhouse gas emissions
Abundant and naturally available fuel sources
Not dependent on fuel prices
Which is an advantage of nuclear power plants?
Low initial investment and construction cost
Not dependent on natural resources and environment
Low operating and maintenance costs
Safe for ecosystems and humans
Which is a disadvantage of nuclear power plants?
Nuclear waste and radiation can seriously affect ecosystems and humans
Produces many greenhouse gases
Low power output
Highly dependent on natural resources and environment
Which component in a hydroelectric power plant is responsible for converting the energy of water into electrical energy?
Coal furnace
Boiler
Generator
Turbine
Which statement is NOT correct about hydroelectric power plants?
If the amount of water flowing down per unit time increases, the power output of the plant increases
If the water level in the reservoir increases, the power output of the plant increases
Hydroelectric power plants always have high power output regardless of water level
The power output depends on the water level in the reservoir
In thermal and hydroelectric power plants, there is a component called a turbine. What is the function of the turbine?
Converts energy into mechanical energy
Delivers water or steam to the generator
Stores generated electrical energy
Converts the energy of water into the energy of the generator rotor
Which of the following is a renewable energy source used for electricity generation?
Coal
Oil
Ocean waves
Natural gas
Which of the following is NOT a renewable energy source used for electricity generation?
Water
Oil
Solar energy
Wind
A small-scale power grid for local consumption typically supplies how much power?
Several tens of kW to several hundred kW
Several hundred kW to several thousand kW
Several thousand kW to several hundred thousand kW
Several hundred thousand kW to several million kW
How many characteristics does a small-scale power grid have?
1
2
3
4
What is a characteristic of a small-scale power grid?
Decentralized voltage distribution
Uses separate transformers to draw power from low-voltage lines with a voltage of 380/127V
Power grid for production equipment and centralized lighting
Uses separate transformers to draw power from low-voltage lines with a voltage of 380/110V
What is a characteristic of a small-scale power grid?
Decentralized voltage distribution
Uses separate transformers to draw power from low-voltage lines with a voltage of 380/220V
Power grid for production equipment and centralized lighting
Uses separate transformers to draw power from low-voltage lines with a voltage of 380/110V
What is a characteristic of a small-scale power grid?
Decentralized voltage distribution
Uses separate transformers to draw power from low-voltage lines with a voltage of 380/127V
Power grid for production equipment and independent lighting
Uses separate transformers to draw power from low-voltage lines with a voltage of 380/110V
What are the loads of a small-scale power grid?
Electrical machines, electrical equipment, electrical repair tools
Electrical equipment, electrical repair tools, lighting equipment
Lighting equipment, electrical machines, electrical repair tools
Electrical machines, lighting equipment, electrical repair tools
Which of the following is NOT included in the small-scale production electrical network?
Electric motors
Electrical devices
Lighting equipment
Electrical appliances
Which device in the small-scale production electrical network is NOT installed in the workshop?
Main distribution board
Branch distribution board
Power distribution board
Lighting distribution board
What is the role of the main distribution board?
To take power from the branch distribution board to supply consumers
To take power from the main distribution board and distribute it to power and lighting distribution boards in the workshop
To take power from the 380/220V low-voltage line from the transformer and distribute it to branch distribution boards
To take power from the branch distribution board to supply the lighting system in the workshop
What is the role of the branch distribution board?
To take power from the branch distribution board to supply consumers
To take power from the main distribution board and distribute it to power and lighting distribution boards in the workshop
To take power from the 380/220V low-voltage line from the transformer and distribute it to branch distribution boards
To take power from the branch distribution board to supply the lighting system in the workshop
What is the role of the power distribution board?
To take power from the branch distribution board to supply consumers
To take power from the main distribution board and distribute it to power and lighting distribution boards in the workshop
To take power from the 380/220V low-voltage line from the transformer and distribute it to branch distribution boards
To take power from the branch distribution board to supply the lighting system in the workshop
Which device is NOT included in the main distribution board?
Switching devices – disconnecting power sources for power distribution boards
Switching devices – disconnecting power sources for lighting distribution boards
Protective devices for branch circuits in case of overload or short circuit
Electrical appliances for maintenance and repair
Observe the diagram of the small-scale production electrical network below and answer the following questions from question 1 to question 3.
Transformer station
Distribution cabinet
Power cabinet
Lighting cabinet
In the diagram of the small-scale production electrical network above, what is the position number 2?
Transformer station
Distribution cabinet
Power cabinet
Lighting cabinet
What is the correct sequence for closing the circuit in the electrical network?
Transformer → Power cabinet → Distribution cabinet → Lighting cabinet
Transformer → Lighting cabinet → Distribution cabinet → Power cabinet
Transformer → Distribution cabinet → Power cabinet → Lighting cabinet
Transformer → Power cabinet → Lighting cabinet → Distribution cabinet
What is the correct sequence for opening the circuit in the electrical network?
Power cabinet → Lighting cabinet → Distribution cabinet → Transformer
Lighting cabinet → Power cabinet → Distribution cabinet → Transformer
Power cabinet → Lighting cabinet → Transformer → Distribution cabinet
Lighting cabinet → Distribution cabinet → Power cabinet → Transformer
In practice, when disconnecting electricity in a factory, the order is from the factory to the source, i.e., from the branch distribution cabinet, to the main distribution cabinet, to the power cabinet, and to the lighting cabinet. Why is the order reversed when reconnecting electricity?
To facilitate usage process
To ensure safety and reduce risk of electric shock
To show the phenomenon of electrical overload
To avoid breaking the wire
What voltage is commonly used in low-voltage electrical networks in Vietnam?
500V
100V
220V
320V
What is the frequency of the grid used for household low-voltage networks in Vietnam?
20Hz
30Hz
40Hz
50Hz
Where is the branch distribution cabinet usually installed?
Residential areas
Transformer station
Family houses
Distribution grid
Where is the branch distribution cabinet for an area usually installed?
Residential areas
Transformer station
Family houses
Distribution grid
What is the typical medium voltage line for a step-down transformer station that takes electricity from the distribution grid?
22kV or 33kV
22 kV or 35kV
0.4kV or 22kV
0.4kV or 35kV
Which of the following is a possible output voltage for a step-down transformer station using a transformer?
110/220V
380/220V
110/22V
380/110V
What is the permissible voltage deviation for the output of a step-down transformer station?
Not more than ±5%
Not more than ±2%
Not more than ±10%
Not more than ±1%
What is the main function of a low voltage network?
Transmit electrical energy from the distribution transformer station to the user's meter.
Supply direct energy to households and businesses.
Absorb solar energy and transmit it to the distribution transformer station.
Step down voltage from high voltage to low voltage in businesses.
Which of the following is NOT a characteristic of a low voltage network in residential use?
Large number of households using electricity.
Small and dispersed consumption.
Low voltage level.
Residential low voltage network in Vietnam has 110V voltage and 50Hz frequency.
In the schematic diagram of a low voltage network used in residential activities, what does position (1) represent?
Households using electricity
Transformer station
Distribution grid
Area distribution cabinet
In the schematic diagram of a low voltage network used in residential activities, what does position (2) represent?
Households using electricity
Transformer station
Distribution grid
Area distribution cabinet
In the schematic diagram of a low voltage network used in residential activities, what does position (3) represent?
Households using electricity
Transformer station
Distribution grid
Area distribution cabinet
Which country does not use a voltage of 220V?
Vietnam
European countries
North America
African countries
Which country does not use a voltage of 110V?
Vietnam
Some South American countries
North America
Japan and Taiwan
When working in a group to understand the role of the electrical system, An's group made the following comments. "Electricity is widely used because: a) It can be transmitted over long distances with minimal loss b) It does not harm the environment c) It can be easily converted to other forms of energy d) It poses no danger to humans"
a, b, c are correct
a, c are correct
b, d are correct
a, b, c, d are correct
In the national electrical system, the voltage is increased very high before being transmitted over long distances. What is the main purpose of this?
To ensure safety for the lines
To reduce energy loss due to Joule-Lenz effect
To increase the current in the lines
To reduce the installation cost of the lines
