Office Chair Factory Exam

Here are the detailed answers to the office chair factory exam:

I. Practical Assessment Answers

1. Multiple Choice Questions

   • The correct steps for installing the seat cushion foam are to first lay the foam flat inside the seat frame and then glue the edges. This ensures the foam fits snugly and prevents shifting or deformation during subsequent use.
   • The incorrect method for testing the sealing performance of a pneumatic rod is to strike the rod's surface with a hammer. The correct approach is to observe pressure stability after inflation or use professional testing equipment, as striking may damage the internal structure.
   • In equipment operation safety regulations, the correct action is to immediately press the emergency stop button and report to the team leader upon detecting abnormal equipment sounds. This prevents the fault from escalating and ensures personnel safety.

2. True/False Questions

   • The backrest angle adjustment should be performed after all components are assembled: True. Adjusting it earlier may cause misalignment of subsequent components, affecting overall structural stability.
   • Ground oil stains can be washed away directly with water: False. Oil stains should be absorbed with oil-absorbent pads before cleaning; direct washing may spread the oil or contaminate the drainage system.

II. Skill Assessment Answers

1. Multiple Choice Questions

   • The cutting tolerance range for chair surface fabric is ±1mm. This precision ensures the fabric matches the frame, preventing exposed edges or wrinkles.
   • The standard torque value for bolts connecting chair legs to the chassis is 25±3N·m. Insufficient torque may cause loosening, while excessive torque may damage the threads.
   • The required number of fatigue test cycles for the backrest is 50,000. This standard simulates long-term use to verify backrest durability.

2. True/False Questions

   • Cotton gloves can be worn when operating rotating equipment: False. Cotton gloves may get caught in the equipment; cut-resistant gloves should be worn instead.
   • The standard stitch spacing for chair surface sewing is 10-12 stitches per inch: True. This spacing balances seam strength and appearance smoothness.

III. Material Strength Assessment Answers

1. Multiple Choice Questions

   • The most commonly used high-strength engineering plastic for five-star bases is glass fiber-reinforced polypropylene (glass fiber PP). It combines lightweight properties with high strength, suitable for load-bearing requirements.
   • The static load-bearing standard for a single office chair seat plate is 1500N. This value simulates human weight to ensure safety.

2. True/False Questions

   • The strength of a backrest support rod is only affected by the material and not by the cross-sectional shape: False. The cross-sectional shape (e.g., circular, square) directly affects bending resistance.

3. Calculation Question

   • Minimum outer diameter calculation for a five-star base leg: According to the circular tube section bending formula, the outer diameter must be calculated using the material's yield strength (220MPa), pressure (800N), and wall thickness (2mm), with the result rounded to one decimal place.

IV. Quality Control Assessment Answers

1. Single Choice Questions

   • The most ergonomic backrest design is a curved backrest. It fits the natural curve of the spine and distributes pressure evenly.
   • The standard height for a backrest is 60 centimeters. This height supports the area from the shoulder blades to the lumbar region.
   • The most eco-friendly chair seat material is eco-friendly foam. It contains no harmful substances and is recyclable.

2. Multiple Choice Questions

   • Factors affecting office chair comfort include backrest height, chair leg height, seat width, and seat depth. These parameters must match human body dimensions to prevent fatigue.

Exam Instructions Supplement: For practical questions, follow the job description steps, such as inspecting material defects before assembling a five-star base and tightening bolts according to torque specifications. For theoretical questions, understand the principles behind the standards, such as load-bearing tests simulating extreme usage scenarios.