WorksheetsGiữa Kỳ 1 Môn Công Nghệ 12
Total questions: 90
Worksheet time: 1hrs 25mins
What is electrical engineering?
a field of engineering related to the research and application of electrical and electromagnetic technology in the production, transmission, distribution, and use of electrical energy.
a field of technology related to the research and development of internal combustion engines for life and production.
the branch of electronic engineering related to the research and operation of machinery and equipment in mechanical production.
the branch of engineering related to the research and development of high-tech products in the construction field.
What is the purpose of developing new materials for electrical engineering?
to create various designs of electrical devices according to market demand.
for electrical devices to operate at all existing voltage levels domestically and internationally.
to create electrical devices with high efficiency, energy-saving, and environmentally friendly.
to increase revenue from electrical device production and expand the market for electrical device production.
Observe the image and state the name and function of that device in life?
The fire alarm device will detect and activate the fire prevention system immediately, helping to alert the public and fire agencies.
The electrical socket shares electrical energy, reduces load on the main power source, ensuring safe transmission connections, and providing effective energy supply.
The circuit breaker is designed to automatically disconnect the circuit when there is an overload, short circuit, or voltage drop.
The fuse is a component or device that protects the circuit by breaking the circuit.
What are the main advantages of electrical devices that show the position and role of electrical engineering in production and life?
What are the main advantages of electrical devices that show the position and role of electrical engineering in production and life?
Large capacity, high efficiency, reduce labor for humans, increase electricity consumption.
Provide electricity for production, thanks to electrical devices that help improve community living standards.
Provide electrical devices for production, thanks to electrical devices that help improve the quality of family life.
Compact structure, low power consumption, high efficiency, with smart controlled communication protocols.
When using a rice cooker, what form of energy has electrical energy been converted into?
Light energy
Chemical energy
Thermal energy
Mechanical energy
Which statement is incorrect about the position and role of electrical engineering in life?
Providing energy for electrical devices in the family.
Improving the quality of family life.
Enhancing community living standards.
Family life is becoming more inconvenient due to smart electrical devices.
Which component plays a role in producing electrical energy in the electrical system?
Transformer
Solar energy panel
Transmission line
Electric fan
What is the job of an electrical design engineer?
Designing circuit diagrams and related technical documents.
Manufacturing electrical devices from initial materials and components according to production processes.
Constructing and installing electrical devices from discrete devices according to design documents.
Repairing electrical devices when faults or incidents are detected.
What field does the work of installing, connecting power lines and electrical equipment for the electrical project belong to?
Electric operation.
Electrical installation.
Manufacturing and fabrication of electrical equipment.
Electrical design.
What is the task of the electrical installation and repair worker?
Conduct research, consulting, design, direct construction and operation, maintenance and repair of electrical systems, components, motors, and electrical equipment.
Support research, design, production, assembly, construction, operation, maintenance, and repair of electrical equipment and power distribution systems.
Directly install, maintain, and repair electrical systems, power transmission lines, and electrical equipment.
Assemble, inspect, replace, and maintain automotive engines.
What work is aimed at maintaining the normal working condition of the electrical system to meet quality, reliability, and economic requirements?
Manufacturing and fabrication of electrical equipment.
Electrical installation.
Maintenance and repair of electrical systems.
Electric operation.
The requirement 'Having a university degree in electrical engineering' is for which job position?
Electrical engineer.
Electrical technician.
Electronic technician.
Electrical installation and repair worker.
What job position does 'electric technique' refer to?
Electrical engineer
Electrical technician
Electronic technician
Electric installation and repair worker
What job position requires 'equivalent vocational training in electrical technique'?
Electrical engineer
Electrical technician
Electronic technician
Electric installation and repair worker
What does a three-phase alternating current circuit consist of?
Three-phase power source and three-phase line
Three-phase power source and three-phase load
Three-phase line and three-phase load
Three-phase power source, three-phase line, and three-phase load
What is used to create a three-phase alternating current?
Three-phase alternating current generator
Single-phase alternating current generator
Single-phase or three-phase alternating current generator
Battery
Why is the three-phase circuit with little connection rarely used in practice?
The phases have no electrical connection
Wasting wires
The circuit cannot operate
Wasting wires and the phases have no electrical connection
If the three-phase load is symmetrical, when connected in star, then:
Id = √3 Ip
Id = Ip
Ud = Up
Id = √3 Id
If the three-phase load is symmetrical, when connected in delta, then:
Id = Ip
Ip = √3 Id
Ud = Up
Ud = √3 Up
Which component connects the neutral point of the source to the neutral point of the load?
Phase wire
Neutral wire
Line voltage
Phase voltage
Observe Figure 3.8 and identify how the three-phase loads 1, 2, 3 are connected?
Load 1 connected in star, load 2 connected in delta, load 3 connected in star with neutral wire
Load 1 connected in delta, load 2 connected in delta, load 3 connected in star with neutral wire
Load 1 connected in star, load 2 connected in delta, load 3 connected in delta
Load
What is the national electricity system composed of?
Power source, consumers
Power source, power grid, consumers
Conductors and power stations
Conductors, power stations, and consumers
What is the role of the power grid in the national electricity system?
Connect, transmit, and distribute electricity from the source to the consumers.
Generate electricity and supply it to the national electricity system.
Consume electricity produced from national power sources.
Consume electricity, convert electrical energy into other forms of energy.
Which voltage level is not present in the following power system diagram?
Low voltage
Medium voltage
High voltage
Super high voltage
The North-South 500kV power transmission line currently has a length of approximately
1670km
1780km
1870km
1890km
The national electricity system supplies electricity to
Northern region
Central region
Southern region
Nationwide
The electrical network in factories, enterprises, and residential areas belongs to which power grid?
Distribution grid
Transmission grid
Both A and B are correct
Both A and B are incorrect
What is the lowest voltage level supplied by the national electricity system?
24 V
110 V
220 V
36 V
Electricity production is the process of converting various forms of... into electrical energy.
Thermal energy
Hydraulic energy
The process of producing electrical energy is the conversion of forms into electrical energy.
Thermal energy
Water energy
Other energy
Identical energy
Which of the following energy sources is used to produce electrical energy?
Water energy, wind energy, thermal energy
Water energy, solar energy, chemical energy
Water energy, wind energy, thermal energy, solar energy, chemical energy
All energy sources in nature
Nuclear power plants use energy from fission reactions to heat water to create high-pressure steam that turns the turbine of the generator to produce electricity. It has a large power generation capacity, but a major drawback is:
Greenhouse gas emissions
Nuclear waste and radiation can seriously affect ecosystems and humans
Low, unstable power generation capacity due to changing sunlight intensity
All of the above answers are correct
In our country, which provinces have wind power methods been established?
Bạc Liêu, Bình Định, Ninh Thuận
Hà Nội, Nam Định
Hòa Bình, Sơn La
All provinces in the south
Which country in the world leads in nuclear power?
Japan
Vietnam
China
USA
Among the following methods, which method produces the most greenhouse gas emissions?
Wind power
Hydropower
Solar power
Thermal power
Coal used to produce electrical energy is classified as which energy source?
Renewable energy
Non-renewable energy
What type of energy is coal used for electricity production classified as?
Renewable energy
Non-renewable energy
Both renewable and non-renewable energy
Not classified as any type of energy
What is the power consumption of a small-scale electricity production network?
From several tens to several hundred KW.
From several hundred KW to several tens KW.
Only consumes power of several tens KW.
Only consumes power of several hundred KW.
Where does a small-scale electricity production network draw electricity from?
Distribution grid to supply to the load.
Transmission grid to supply to the load.
High voltage grid to supply to the load.
Low voltage grid to supply to the load.
What devices are typically found in the main distribution cabinet?
Lighting
Switch
Electric meter
Transformer
For the diagram of a small-scale electricity production network, what is the process of closing the electricity network?
Distribution grid - Main distribution cabinet - Branch distribution cabinet - Motor cabinet - Lighting cabinet.
Distribution grid - Main distribution cabinet - Branch distribution cabinet - Motor cabinet - Lighting cabinet - Production machine, lighting device.
Distribution grid - Branch distribution cabinet - Main distribution cabinet - Motor cabinet - Lighting cabinet.
Which devices are placed in the production workshop in a small-scale electricity production network?
Main distribution cabinet, motor cabinet, lighting cabinet.
Branch distribution cabinet, motor cabinet, lighting cabinet.
Transformer, branch distribution cabinet, motor cabinet.
Main distribution cabinet, branch distribution cabinet, motor cabinet.
In a small-scale electricity production network, what devices are contained in the electrical cabinet?
In a small-scale production electrical network, what type of electrical cabinet contains the devices that cut off the power supply for the lighting system and protects against overloads and short circuits?
Main distribution cabinet
Branch distribution cabinet
Motor cabinet
Lighting cabinet
In a small-scale production electrical network, what is the role of the motor cabinet?
Take electricity from the 380/220V low-voltage line of the transformer to distribute to branch distribution cabinets
Take electricity from the main distribution cabinet to further distribute to motor cabinets and lighting cabinets in the workshop
Take power from the branch distribution cabinet to supply to the load which are production machines in the workshop.
Take power from the branch distribution cabinet to supply the lighting system of the workshop.
The low voltage electrical network used in households in Vietnam has:
Voltage 220V, frequency 50Hz
Voltage 220V, frequency 60Hz
Voltage 110V, frequency 50Hz
Voltage 110V, frequency 60Hz
Which device is commonly used for protection in the main distribution cabinet?
Fuse
Circuit breaker
Transformer
Electric meter
Which of the following devices does not belong to the low voltage electrical network used in households?
Low voltage transformer
Main distribution cabinet
Branch distribution cabinet
Washing machine
In the event that the main distribution cabinet fails, what will happen?
The entire electrical network will stop working
The area distribution cabinets and households will still operate normally
Only the electrical devices near the main distribution cabinet will be affected
The area distribution cabinets will receive electricity directly from the distribution grid
When there is an incident causing a loss
What will happen when there is an imbalance in the load between the phases of the power source?
Increase the efficiency of electricity usage
Reduce energy loss
Can cause overload and damage to electrical devices
Reduce operating costs of the system
Why should households not be connected in series in the residential electrical system?
To avoid energy loss
To ensure each household receives stable voltage
To save on wiring costs
To facilitate inspection and maintenance
Which statement is incorrect regarding the residential electrical network in households?
The residential electrical network is a 2-phase network because the power source has 2 wires
The 220V voltage of the residential electrical network is phase voltage
Electrical devices in Vietnamese households usually have a rated voltage of 220V
The household electrical network is connected from the electricity meter to the branch of the low-voltage network
With an allowable error of ± 5%, the rated phase voltage of the residential electrical network is in the range?
198V to 242V
361V to 399V
209V to 231V
342V to 418V
Fill in the blank: The electrical system in households is responsible for distributing electrical energy from ……….. to the loads which are electrical devices in the household?
What device is responsible for protecting against overload, connecting or disconnecting power from the low-voltage grid to the electrical system through the electricity measuring device?
Power switch device.
Main electrical cabinet.
Branch electrical cabinet.
Electrical conductor.
How to cut the power supply from the low voltage grid to the electrical system through the electrical measuring device?
Power cut-off device.
Main electrical cabinet.
Branch electrical cabinet.
Electrical wires.
The installation diagram is a diagram that shows the connection positions of devices in the electrical system. How will you use the installation diagram to determine the location to check when encountering a short circuit in the electrical system?
Identify the damaged devices and replace them immediately.
Use the installation diagram to determine the specific location of devices and wires in the system, then check each part to find the cause of the incident.
Check the entire electrical system without relying on the installation diagram.
Turn off the entire electrical system and randomly replace devices.
When designing and installing electrical systems in households, what should be done to ensure the safe and efficient distribution of electrical energy from the low voltage network to the electrical devices in the household?
Use electrical devices with the highest capacity to ensure maximum energy consumption.
Ensure that the wiring system and protective devices such as fuses and circuit breakers are installed according to standards and suitable for the load capacity.
Install all electrical devices in the same circuit for easier control.
Connect electrical devices directly to the low voltage network without protective devices.
What device is represented by the symbol shown in the electrical diagram below?
Incandescent light bulb.
Air conditioner.
Two-pole switch.
Ceiling fan.
What does the symbol in the electrical systems diagram refer to?
Which of the following devices is this?
Incandescent lamp.
Air conditioner.
2-pole switch.
Ceiling fan.
Please tell me which device is represented by the symbol in the diagram of electrical systems?
Circuit breaker.
Electric bell.
2-pole switch.
Fuse.
What is the function of the switch in protecting the power supply?
The electric meter supplies the electrical system and branch circuits.
The branch circuit supplies the lighting system and air conditioning.
The branch electrical cabinet supplies loads that are usually lighting and water heaters.
The power supply to the load.
What role do electrical conductors play in the electrical system?
Connect components and devices in the electrical network and transmit electrical energy from the power source to the load.
Reduce the voltage of the power supply to suit the consuming devices.
Store electrical energy for use when needed.
Generate electrical energy from solar energy.
What is Step 1 in the process of drawing the principle diagram of the electrical system?
Choose suitable electrical devices.
Determine the installation location of each device.
Identify the purpose and requirements of the circuit.
Design the connection diagram of the devices.
What is Step 2 in the process of drawing the principle diagram of the electrical system?
Identify the purpose and requirements of the circuit.
Analyze each electrical relationship of the elements in the electrical system.
Draw the principle diagram of the electrical system.
Measure the power consumption of the circuit.
What is Step 3 in the process of drawing the principle diagram of the electrical system?
Identify the purpose and requirements of the circuit.
Draw the principle diagram of the electrical system.
Measure the power consumption of the circuit.
Analyze each electrical relationship of the elements in the electrical system.
In the technology class, the teacher presented a drawing (as shown below) and asked the students to make statements. Which statement is correct?
The image is a design drawing of an electric motor.
The image is a drawing of an internal combustion engine.
The device is used to convert mechanical energy into electrical energy.
The device operates based on the principle of electromagnetic induction and electromagnetic force.
To enhance customer service, improve stability and safety of the power grid, while minimizing negative environmental impacts and increasing sustainability in the electricity sector, Thai Nguyen Power has implemented smart grids. The applications of smart grids include:
Energy and cost savings: By optimizing the network and operating more efficiently, smart grids help reduce energy waste and operating costs.
Smart metering: Electric energy measuring devices (such as electronic meters) are integrated with technology to send detailed real-time data on energy usage.
Creating automated systems to manage work schedules, log data, and handle requests from power sector employees.
Can answer customer inquiries, assist with orders, and handle simple requests through online communication.
A school installed a three-phase air conditioning system. During inspection, the technician found that the voltage between two phases was not standard. What issues could this cause?
What issues can arise from incorrect voltage between two phases?
Incorrect voltage can cause equipment damage and reduce operational efficiency. Technicians need to check and adjust the electrical system to ensure the voltage is correct.
Increase the lifespan of the equipment
Improve the operational efficiency of the equipment
No impact on the equipment
What are the roles of the components in the national electricity system?
The power source generates electrical energy and supplies it to the national electricity system.
The power grid converts electrical energy into different forms of energy for production and daily life.
The power grid connects, transmits, and distributes electrical energy from the power source to the consumption points.
The load receives electrical energy from the transmission grid to directly supply power to electrical devices.
What are the main methods of electricity production?
Hydropower plants use the potential energy of water in reservoirs to convert it into kinetic energy to rotate the turbine of the generator to produce electricity.
Thermal power plants use fossil fuels to burn, heating water to create low-pressure steam that rotates the turbine of the generator to produce electricity.
Nuclear power plants use energy
Which statement about small-scale power networks is correct?
Small-scale power networks take electricity from the distribution grid.
Small-scale power networks take electricity from the transmission grid.
Small-scale power networks take electricity directly from power plants.
Small-scale power networks provide electricity to production workshops.
Ba Huy has a small wood production workshop. Whenever it operates, the production machines consume a lot of electricity, causing the local electrical system to frequently experience voltage drops due to overload, affecting other households. Ba Huy asked everyone for suggestions to fix this issue:
Install solar power for production machines because solar power has high and stable output.
Use voltage stabilizers so that production machines operate normally without affecting other households.
Replace the electrical wires in the workshop with larger diameter wires that can withstand high current without causing voltage drops.
Regulate production machines to operate non-simultaneously and not produce during peak hours to reduce voltage drop due to overload.
During the process of fixing electricity at home, Minh was asked to take...
During the process of fixing the electricity at home, Minh's father asked Minh to take the circuit breaker (Figure 2) to install it in the electrical panel. Minh told his father that they just learned about this device today. So, his father asked Minh whether the following statements are true or false?
The circuit breaker is a device that can manually turn on and off electricity.
The circuit breaker in the image allows a current of 20A to pass.
The number 600V on the circuit breaker indicates the maximum voltage that the circuit breaker can withstand.
The circuit breaker is installed in the outdoor electrical cabinet along with the control switch system.
The electrical system diagram in a household includes a principle diagram and an installation diagram, each having its own role and function. In which:
The principle diagram shows the operation and connection between devices in the electrical system.
The installation diagram shows the position and specific installation of electrical devices.
The principle diagram represents the electrical relationship of the elements in the electrical system.
The principle diagram is used to determine the repair location of electrical devices in the electrical system.
The Thai Nguyen Power Company announces recruitment for the position of thermal engineer. Mr. A wishes to apply for the above job position. What criteria does Mr. A need to meet to be suitable for the recruitment position?
Educational level: Graduated from university in a field related to electricity or related technical fields.
Educational level: Graduated from a vocational college in electrical engineering.
Experience in the energy sector, especially in operating and maintaining thermal power plants.
A three-phase load consists of three resistors R = 10Ω, connected in a delta configuration, connected to a three-phase power source with Ud = 380V. Calculate the phase voltage?
A three-phase generator has a phase winding voltage of 220V. Calculate the line voltage if it is connected in a star configuration?
Given a three-phase symmetrical load connected in a delta configuration where the line voltage Ud = 380V and the three-phase load consists of 3 resistors R= 50Ω. Calculate the line current of the circuit.
Why is electrical energy considered an important energy source in our daily lives? Please provide examples to illustrate the points made.
Present some new technology trends in the field of electrical engineering that help improve energy efficiency and protect the environment.
According to the internet or books, please find out the role of the National Electricity System Dispatch Center in commanding, controlling, and operating the electricity system.
Based on your knowledge of methods of generating electrical energy.
Compare small-scale electricity production networks and low-voltage electricity networks used in households.
Based on your knowledge of methods of producing electrical energy.
