433A Study Guide 2026
Everything you need to pass the 433A exam in one place: the exam format, every topic to study, real practice questions with explanations, flashcards, and full-length practice tests. Free, no sign-up needed.
📋 433A Exam Format at a Glance
📚 433A Topics to Study (39)
✍️ Sample 433A Questions & Answers
1. What does the designation 6205-2RS on a bearing indicate?
The 6205-2RS designation indicates a 6200-series deep groove ball bearing (62), with a 25 mm bore (05 × 5 = 25), and two rubber contact seals (2RS).
2. What is an air-over-oil system?
An air-over-oil system uses compressed air acting on top of oil in sealed tanks to push oil through a closed circuit to hydraulic cylinders. This combines the advantages of pneumatic power (simple, clean) with hydraulic smoothness and rigidity.
3. What is the function of a hydraulic relief valve?
A relief valve is a pressure-limiting safety device that opens when system pressure exceeds its set point, diverting excess flow back to the reservoir to prevent damage to pumps, cylinders, motors, and other system components.
4. Which factor most directly affects the L10 life rating of a rolling element bearing?
The L10 bearing life is calculated based on the ratio of the bearing's dynamic load rating (C) to the applied equivalent load (P). Life varies with the cube of this ratio for ball bearings and the 10/3 power for roller bearings.
5. What is the primary purpose of attaching a tagline to a suspended load?
A tagline allows workers to guide and stabilise a suspended load from a safe distance without being in the load's fall zone.
6. What condition is indicated by a blue discoloration on a bearing race?
Blue or straw-colored discoloration on bearing races indicates that the bearing has been subjected to excessive heat, typically above 200°C. This overheating compromises the bearing's hardness and load capacity.