For the 2026 (Reiwa 8) exam.

Past exam questions for the 1st Class Electrical Construction Management Engineer (Subject) exam from 2025 (Reiwa 7) to 2010 (Heisei 22).

No in-app purchases or ads.

Using this app in conjunction with textbooks and other study materials will make it even more effective. Understand the exam trends, find your own study method, and proceed with your studies systematically.

Each question is presented with a clear [Question ⇒ Answer] format for immediate confirmation.

The answer page also includes the original question, making review easier.

The learning confirmation tests (R7-R1) shuffle the questions each time, allowing you to check your progress.

Study little by little on your mobile phone or tablet during your commute or breaks.

*This includes past exam questions from 2025, 2024, 2023, 2022, 2020, 2020, 2018, 2017, 2016, 2015, 2014, 2013, 2012, 2011, and 2010.

This is for those aiming to pass by repeatedly reviewing past questions.

One of the most important things for obtaining a qualification is repeatedly reviewing past questions.

By repeatedly reviewing past questions, you can understand the structure of the questions, the types of questions that tend to appear, and your own strengths and weaknesses. Therefore, you can use past questions to create an exam preparation and study plan, determining which areas to focus on and how to earn points.

Find your own learning method and proceed with your studies systematically.

[Example Question]
R5(1st Stage)-4
Which of the following descriptions regarding the operating principle of an indicating electrical meter is inappropriate?

Induction instruments are instruments that operate through the action of electrostatic force generated between a fixed electrode and a movable electrode.
R5(Primary)-6
Which of the following statements regarding generators is the most inappropriate?
Induction generators are generally complex in structure and expensive.
R5(Primary)-8
Which of the following statements regarding high-voltage power factor correction capacitors is the most inappropriate?
Foil (NH) capacitors have a self-healing function.
R5(Primary)-9
Which of the following is the correct flow rate [m³/s] required to generate a maximum output of 147 MW in a hydroelectric power plant? Assume the effective head is 250 m and the combined efficiency of turbine efficiency and generator efficiency is 80%.
R5(Primary)-10
Which of the following statements regarding the components of a substation is the most inappropriate?
Zinc oxide surge arresters require a series gap. R5(Primary)-11
Which of the following statements regarding electromagnetic induction voltage to communication lines adjacent to overhead power lines is the most inappropriate?
It increases when an overhead ground wire with high conductivity is installed.
R5(Primary)-12
Which of the following statements regarding power sources connected to power systems is the most inappropriate?
Wind power generation is used as peak supply power because it is easy to adjust the output to match demand.
R5(Primary)-13
Which of the following statements regarding indoor lighting is the most inappropriate?
The light color of light sources with a correlated color temperature of less than 5300K is classified as cool color.
R5(Primary)-14
Which of the following terms is the most appropriate for the following sentence regarding the electrolytic extraction of metals? "When a metal plate containing impurities is used as the anode and electrolysis is performed in a solution containing its metal ions, pure metal is deposited at the cathode, and high-purity metal is obtained."
Electrolytic refining
R5(Primary)-15
Which of the following statements regarding three-phase induction motors is the most inappropriate? Slip is the value obtained by dividing the synchronous speed by the difference between the synchronous speed and the rotor speed.
R5(1st)-16
Which of the following statements regarding combined cycle power generation, compared to steam power generation using a steam turbine, is inappropriate?
Assume the power generation equipment has the same capacity.
Changes in atmospheric temperature have little effect on the output.
R5(1st)-17
Which of the following statements regarding polymer electrolyte fuel cells is inappropriate?
Carbon monoxide can be used as fuel.
R5(1st)-18
Which of the following statements regarding oil-filled transformers installed in substations is the most inappropriate?
Increasing the magnetic flux density of the iron core is effective in reducing noise.
R5(1st)-19
Which of the following is the most inappropriate purpose for installing a fault propagation prevention relay system, which prevents the effects of a localized fault in the power system from spreading to the entire system?

Busbar Protection
R5(Primary)-20
Which of the following statements regarding measures to improve the supply reliability of power systems is the most inappropriate?
Periodic inspections of equipment should be planned to be averaged throughout the year, regardless of the load.
R5(Primary)-21
Which of the following statements regarding galloping of overhead transmission lines is the most inappropriate?
This is a phenomenon where ice and snow attached to the wires fall off, causing the wires to spring upwards as a result.
R5(Primary)-23
Which of the following statements regarding the skin effect of transmission lines is inappropriate?
The greater the skin effect, the greater the current density in the center of the wire.
R5(Primary)-24
Which of the following is an inappropriate measure to suppress corona discharge in overhead transmission lines?
In the case of multi-conductor lines, reduce the number of elementary conductors.
R5(Primary)-25
Which of the following statements regarding the protection of distribution systems is the most inappropriate?

To protect high-voltage distribution lines from ground faults, overcurrent relays are installed in substations.
R5(Primary)-26
Which of the following definitions of terms related to grid interconnection equipment for distributed power sources is incorrect according to the "Technical Standards for Electrical Equipment and Their Interpretation"?
A transfer circuit breaker is a device that transmits the tripping signal of a circuit breaker via a communication line and operates another circuit breaker installed on the same premises.
R5(Primary)-27
Which of the following descriptions regarding measures to suppress voltage flicker occurring in distribution systems is the most inappropriate?
A step-type automatic voltage regulator (SVR) is installed on the power source side of the source.
R5(Primary)-28
Which of the following descriptions regarding illuminance calculation using the luminous flux method for general indoor lighting is inappropriate?
The larger the room index, the lower the illuminance.
R5(Primary)-29
Which of the following descriptions regarding floor heating installed indoors is inappropriate according to the "Technical Standards for Electrical Equipment and Their Interpretation"?
The heating element temperature was installed so as not to exceed 120°C.
R5(Primary)-30
Which of the following descriptions regarding the performance of overcurrent circuit breakers installed in low-voltage circuits is inappropriate according to the "Technical Standards for Electrical Equipment and Their Interpretation"?
However, the low-voltage circuit is a low-voltage branch circuit leading only to an electric motor.
A short-circuit protection circuit breaker must not operate within 0.2 seconds with a current 1.2 times the set current.
R5(Primary)-31
Which of the following is the minimum allowable current [A] required for a low-voltage indoor main circuit connecting the following loads A and B, according to the "Technical Standards for Electrical Equipment and Their Interpretation"?
A. Total rated current of the electric motors: 80A
B. Total peak rated current: 60A
148A
R5(Primary)-32
Which of the following descriptions regarding equipment used in high-voltage substations is inappropriate?
The terminal voltage of a power factor correction capacitor will be lower than the circuit voltage when a series reactor is used.
R5(Primary)-33
Which of the following descriptions regarding cubicle-type high-voltage power receiving equipment is inappropriate according to the Japanese Industrial Standards (JIS)?
If the transformer capacity is 500kV·A, a high-voltage cutout can be used as the switching device on the primary side of the transformer.
R5(Primary)-34
Which of the following descriptions regarding a low-voltage spot network system receiving power via three lines is inappropriate?
A protector fuse is installed on the primary side of the network transformer.
R5(Primary)-35
Which of the following descriptions regarding the cooling method of a diesel engine used in private power generation equipment is the most inappropriate?
A direct-coupled radiator cooling system becomes inoperable if the supply of water is cut off due to an earthquake, etc.
R5(Primary)-36
Which of the following descriptions regarding stationary lead-acid batteries is inappropriate according to the Japanese Industrial Standards (JIS)?

A valve-regulated lead-acid battery releases gas under normal conditions, but becomes sealed when the internal pressure exceeds a specified value.
R5(1st)-37
Which of the following descriptions regarding grounding work in steel-framed buildings is inappropriate according to the "Technical Standards for Electrical Equipment and Their Interpretation"?
When a residual current circuit breaker that shuts off in 1 second when a ground fault occurs in a low-voltage circuit is installed, the grounding resistance value for Class C grounding work can be set to 500Ω.
R5(1st)-38
Which of the following descriptions regarding the functions of a central monitoring and control system is the most inappropriate?
Trend display shows equipment system diagrams and floor plans on a display device, and indicates the status of equipment and alarms by changing the color or flashing of the symbols.
R5(1st)-39
Which of the following descriptions regarding automatic fire alarm systems is inappropriate according to the "Fire Service Act"?
The floor areas of the 3rd and 4th floors of the office building were both 500 m², so they were combined into one protected area. R5(1st Stage)-40
Which of the following statements regarding emergency lighting devices (lighting equipment) is incorrect under the "Building Standards Act"?

A horizontal illuminance of 5 lb or more must be ensured on the floor surface of the underground passages adjacent to each section of the underground shopping mall.

R5(1st Stage)-41
Which of the following statements regarding microphone selection is the most inappropriate?

A bidirectional microphone was selected to collect sound from all directions.

*While every effort has been made to ensure the accuracy of the information in this app, we cannot guarantee its accuracy.

We assume no responsibility for any inconvenience or disadvantage resulting from the use of this app.

*The content of this app may be added, updated, changed, or modified without prior notice.