SSW2 Electrical and Electronic Equipment Assembly Category Study Reference Material

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Manufacturing Sector Specified Skilled Worker No. 2 Evaluation Test (Practical Test)

Electrical and Electronic Equipment Assembly Category Study Reference Material

Electrical and Electronic Equipment Assembly Category
Electrical and Electronic Equipment Assembly Category1920×1277 293 KB

Note: This is an English translation of the original from the SSW Portal site. It is intended to be used with the original Japanese material .

Download this in PDF: SSW2 Electrical and Electronic Equipment Assembly Category Study Reference Material (1.2 MB)

1. OUTLINE OF THE MANUFACTURING SECTOR SPECIFIED SKILLED WORKER NO. 2 EVALUATION TEST (Practical Test)

  • Exam Category: This study reference material is for the Electrical and Electronic Equipment Assembly category.
  • Exam duration: 60 minutes
  • Number of questions: 20
  • Passing standard: 60% of right answers
  • The scope of questions for the Electrical and Electronic Equipment Assembly category is as follows:
Item Content No. of questions (estimated)
Safety & Health / Quality Control Able to carry out specific safety and health management and quality control 6
Electricity Ability to make electrical adjustments for electrical and electronic equipment assembly related work 4
Drafting Ability to draw for electrical and electronic equipment assembly related work 2
Tools Ability to use related tools for electrical and electronic equipment assembly related tasks 2
Mechanical Ability to carry out mechanical work 2
Electrical Ability to carry out electrical work 2
Other applied problems Ability to perform practical tasks and calculations associated with electrical and electronic equipment assembly-related work 2
Total: 20

2. HOW TO USE THE STUDY REFERENCE MATERIAL

(1) About the study reference material

  • This study reference material contains 10 study reference questions.
  • In the actual exam, 20 questions will be asked, as described on the previous page.
  • In the actual exam, the questions will not be the same as those in the study reference. Also, the order in which the questions are asked will be random.

(2) Structure of study reference materials

  • From the next page, the topic, question text, and answer choices for each problem are listed, so please try solving them.
  • The correct answers and explanations for each problem are on page 13 and onwards. After solving the problems, check your answers to make sure you have understood them correctly.
  • The correct answers and explanations page lists “keywords” for each question area, so please use them as a reference for your studies.

3. STUDY REFERENCE MATERIAL

[HEALTH & SAFETY / QUALITY CONTROL]

Question No. 1

Choose one correct action from options A through D if a chemical gets into your eyes at a manufacturing site where chemicals are handled.

  • After rinsing the eyes with running water, I was examined by an ophthalmologist.

  • After using eye drops to relieve redness, I was examined by an ophthalmologist.

  • After absorbing the eye medicine with a towel, I was examined by an ophthalmologist.

  • After disinfecting the eyes with alcohol, I was examined by an ophthalmologist.

Question No. 2

Which of the following machine tasks is not a safe operation? Choose one from options A through D.

  1. I forgot my protective gear, so I used a spare gear.

  2. The machine was not working properly, so I worked while pushing the moving part with my hand.

  3. The previous process had stopped, so I stopped the machine and cleaned it.

  4. I stopped the machine, checked for safety, and then took measures to resolve the problem.

Question No. 3

Choose one of the options A to D that is incorrect regarding the effects of quality control.

  1. Stable material quality reduces loss and waste, and can reduce purchasing cost.

  2. Reducing the occurance of defects can shorten equipment adjustment time and improve equipment uptime.

  3. Fewer defective products reduce product waste and eliminate quality inspection.

  4. Stable product quality increases customer trust, which can lead to an increase in orders.

[ELECTRICITY]

Question No. 4

Choose the correct current value for I1, I2, and I3 in the circuit diagram below from options A through D. (Refer to the original Japanese version to see the image.)

  1. I1=0.5 [A], I2=1 [A], I3=0.25 [A]

  2. I1=12 [A], I2=12 [A], I3=6 [A]

  3. I1=2 [A], I2=1 [A], I3=4 [A]

  4. I1=12 [A], I2=24 [A], I3=6 [A]

Question No. 5

Choose the incorrect statement about electricity from options A-D.

  1. The voltage of the power supply used for factory pumps, elevators, production equipment, etc. is often 200V.

  2. A vacuum cleaner with a power consumption of 1250W can be plugged into a 100V, 15A rated outlet.

  3. In electricity, there are direct current and alternating current, and among alternating current there are “single-phase AC” and “three-phase AC”.

  4. The power frequency in Japan is 60Hz for both 100V and 200V.

[DRAFTING]

Question No. 6

Choose one from options A to D that shows the length of a chord using extension lines and dimension lines.

  1. (Refer to the original Japanese version to see the image.)

  2. (Refer to the original Japanese version to see the image.)

  3. (Refer to the original Japanese version to see the image.)

  4. (Refer to the original Japanese version to see the image.)

[TOOLS]

Question No. 7

Choose the incorrect statement from options A to D about tools and equipment in a factory. (Refer to the original Japanese version to see the images.)

  1. Although the expiration date of helmets (protective hats) is not set by law, they should be checked regularly to ensure they are functional and free of damage.

  2. Carts have a maximum load (appropriate allowable load), and exceeding this load can damage the cart.

  3. In JIS, the signal tower of a production facility indicates the process status, with green representing a “normal state” and yellow representing an “abnormal state.”

  4. Wrist straps should be used to prevent tools from falling or being lost during work.

[MECHANICAL]

Question No. 8

Of the following gear combinations, choose one from options A through D that represents the correct direction of rotation. Note that each gear rotates in the position shown in the figure.

  1. (Refer to the original Japanese version to see the image.)

  2. (Refer to the original Japanese version to see the image.)

  3. (Refer to the original Japanese version to see the image.)

  4. (Refer to the original Japanese version to see the image.)

[ELECTRICAL]

Question No. 9

Choose one of the options A through D that is incorrect as to why a relay may malfunction. (Refer to the original Japanese version to see the image.)

  1. An overvoltage was applied to the relay coil.

  2. The relay was dropped and subjected to shock.

  3. A single relay was used to open and close both a DC load and an AC load.

  4. An abnormal overcurrent that exceeded the rated contact current flowed.

[OTHER APPLIED PROBLEMS]

Question No. 10

Choose one of the options A to D that is incorrect as a basic principle for preventing workplace accidents.

  1. Wear designated safety clothing when working.

  2. Work according to the procedure each person thought of, and do it in the way that is easiest for each one.

  3. Follow the instructions carefully and make it a habit by doing them repeatedly.

  4. Discuss the dangers that lurk in the workplace and in work, and the accidents that can result from them.

4. ANSWERS AND EXPLANATION

[HEALTH & SAFETY / QUALITY CONTROL]
Keywords : Prevention of industrial accidents, Industrial Safety and Health Act, trends in industrial accidents, near misses, hazard prediction training (KYT), fool-proofing, fail-safe, risk assessment, various labels (prohibited labels, SDS, reagent labels, etc.), protective equipment (dust masks, protective glasses, etc.), purpose and effect of quality control, seven QC tools, 5S, 4S, 3S, distribution of measurement data, improvement, standardization, quality assurance, self-process assurance, three actual situations

Question No. 1

Answer: A

Explanation:

  • If the liquid gets into your eyes, be sure to rinse thoroughly with running water and consult an ophthalmologist immediately.

  • Do not use eye drops at your own discretion.

  • Do not disinfect with alcohol, as alcohol can scratch the cornea or cause inflammation if it gets into your eyes.

Question No. 2

Answer: B

Explanation:

  • Causes of workplace accidents include unsafe behavior of workers and unsafe conditions of machines and objects.

  • Choice B is considered unsafe behavior because the worker touches the moving parts of the machine while it is running.

*Types of unsafe behavior are listed on the next page.

Question No. 3

Answer: C

Explanation:

  • Quality control (QC) is the inspection, verification, and management of whether a certain level of quality is maintained and whether there are any defective products when manufacturing a product

  • Quality verification is the task of guaranteeing quality by inspecting not only the finished product, but also the materials such as raw materials and parts of the product, and the production process.

  • Therefore, quality verification cannot be eliminated by quality control.

Reference: Unsafe behavior of workers

The Ministry of Health, Labor and Welfare lists the following 12 types of unsafe behavior.

  1. Invalidating protective/safety devices

  2. Failure to implement safety measures

  3. Leaving unsafe conditions unattended

  4. Creating dangerous conditions

  5. Using machines/equipment for purposes other than those specified

  6. Cleaning, oiling, repairing, inspecting machines/equipment while operating

  7. Defects in protective equipment/clothing

  8. Approaching dangerous areas

  9. Other unsafe behavior

  10. Driving failure (vehicle)

  11. Incorrect operation

  12. Other

※ Ministry of Health, Labor and Welfare Workplace Safety Site
https://anzeninfo.mhlw.go.jp/yougo/yougo90_1.html

[ELECTRICITY]
Keywords: Electric circuits, electronic circuits, power supplies, direct current, alternating current, three-phase alternating current, current, voltage, resistance, Ohm’s law, frequency, measuring instruments, control devices, motor drive circuits, integrated circuits (ICs), semiconductor parts, prevention of electrostatic damage, soldering, pattern formation

Question No. 4

Answer: C

Explanation:

  • Calculate each current value using Ohm’s law.

  • Current (I) = Voltage (E) ÷ Resistance (R)

  • I1 = 24 [V] ÷ 12 [Ω] = 2 [A]

  • I2 = 24 [V] ÷ ( 12 [Ω] + 12 [Ω] ) = 1 [A]

  • I3 = 24 [V] ÷ 6 [Ω] = 4 [A]

Question No. 5

Answer: D

Explanation:

  • The frequency of AC power in Japan is 50Hz in eastern Japan and 60Hz in western Japan, so D is incorrect.

  • A: Factories use more electricity than homes, so the more efficient “three-phase 200V power supply” is chosen.

  • B: A typical 100V outlet in Japan has a rated current of 15A, allowing the use of electrical equipment with a power consumption of up to 1,500W.

  • Dry cells and other such devices use DC, while household outlets use AC.

[DRAFTING]

Keywords: Projection methods (first angle projection, third angle projection), understanding of dimension indications, dimension lines, dimension extension lines, dimension extension symbols, electrical symbols, line types, screw types and drawing methods (metric threads, unified threads, etc.), CAD (Computer Aided Design)

Question No. 6

Answer: B

Explanation:

  • The length of a chord is expressed by drawing an extension line perpendicular to the chord and using a dimension line parallel to the chord, so B is the correct answer.

  • C: The extension line is drawn perpendicular to the chord, and a concentric arc is drawn as a dimension line, so it expresses the length of the arc.

  • D: The extension lines are drawn on the two sides that make up the angle, and a concentric arc is drawn as a dimension line, so it expresses the angle dimension.

  • There is no dimension that fits A.

Reference: Arcs, chords and angles

(Refer to the original Japanese version to see the image.)

Reference: Dimension extension lines and dimension lines

(Refer to the original Japanese version to see the image.)

[TOOLS]
Keywords: How to use tools (drivers, wire strippers, crimping tools, heat sealers, etc.), measuring instruments (calipers, micrometers, depth gauges, testers, oscilloscopes, thermographs, LCR meters, etc.), control devices, electric motors

Question No. 7

Answer: D

Explanation:

  • A “wrist strap” is a device that discharges static electricity from the human body to prevent it from adversely affecting products during work.

  • A “safety cord” is a device that prevents tools from being dropped or lost while working.

  • The colors of the “signal tower” are specified by JIS (Japanese Industrial Standards) and are as shown in the table below.

Color Meaning Explanation Operator Actions
Red Emergency (urgent) Dangerous condition Immediate action to deal with a dangerous condition. Example: emergency stop operation, starting cooling pump, etc.
Yellow Abnormal Abnormal condition. Imminent dangerous condition Monitor, intervene
(e.g. re-establishment of original function)
Green Normal Normal condition Optional

It is important to understand not only the names of the various tools and equipment in the factory, but also their purpose, usage, and precautions, and to use them correctly.

[MECHANICAL]
Keywords: Machine elements (gears, screws, shafts, bearings, joints, etc.), cutting conditions (cutting speed, rotational speed, feed rate), hydraulic oil for machines, types of switches, machine tools (NC machine tools, lathes, milling machines, drill presses, grinding machines, grinders, etc.), machining methods (drilling, chamfering, thread processing (tapping), laser processing), molding machines, molds

Question No. 8

Answer: A

Explanation:

  • When spur gears are combined, the direction of rotation is opposite. (Refer to the original Japanese version to see the image.)

  • When the inner and outer diameters are combined, the direction of rotation is the same. (Refer to the original Japanese version to see the image.)

  • Spur gear: A simple cylindrical gear with straight teeth that transmits rotational motion between two parallel shafts. Because it is easy to manufacture, it is most commonly used as a gear for power transmission.

  • Internal gear: A gear with teeth on the inside of a cylinder that meshes with a spur gear. Mainly used in planetary gear devices and gear couplings.

[ELECTRICAL]
Keywords: Handling relays, circuit sequences, electrical symbols, three-phase AC, electric motors, electric circuits, electronic circuits, magnetic fields, electromagnetic forces, sine waves, power, vectors, △-Y circuits, transient phenomena, amplifier circuits, modulation circuits, demodulation circuits, power supply circuits, three-phase induction motors, transformers, inverters, computer networks, communications

*Also includes applied content in the category of ELECTRICITY.

Question No. 9

Answer: C

Explanation:

  • Switching DC and AC loads with a single relay is normal usage and is not a problem as long as the contact capacity is not exceeded.

  • A: Application of overvoltage will cause the coil to break.

  • B: An impact will deform the internal components and cause the contacts to become unstable.

  • D: An abnormal overcurrent will cause the circuit inside the relay to melt or the contacts to fuse, resulting in malfunction.

[OTHER APPLIED PROBLEMS]
Keywords: Hazard prediction training (KYT), product inspection, injection molding, temperature detection, bolt tightening order, management cycle, carbon neutral, DX (digital transformation), cyber security, circular economy

*In addition, applied content of other items is also included.

Question No. 10

Answer: B

Explanation:

  • It is necessary to strictly follow the prescribed work procedures and not to work in any other way. Therefore, B is incorrect.

Reference: 5S

① Sorting (S SEIRI), ② Ordering (S SEITON), ③ Cleanliness (S SEIKETSU), ④ Cleaning (S SEISOU), ⑤ Discipline (S SHITSUKE) In order to create a safe work environment, it is important to fully understand the meaning and purpose of each.

Reference: Hazard Prediction Training (KYT: Kiken Yochi Training) Hazard prediction training is a method of preventing accidents by discussing the dangers that lurk in the workplace or work and the accidents that may occur as a result, and working while raising awareness of specific dangers.

Reference: Ministry of Health, Labor and Welfare Workplace Safety Site
https://anzeninfo.mhlw.go.jp/yougo/yougo_index04.html

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