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4B practice exam › Unit B-1

4B B-1: Lubrication and Bearings

47 practice questions in this unit. Each practice set pulls 20 at a time, so you keep seeing new questions as you go.

What this unit covers: Why and how lubrication works, bearing care and lube systems.

Exam theme: Lubrication, pumps, compressors and prime movers. Commonly reported share of the 100-question 4B exam: about 6 questions (unofficial; SOPEEC and ABSA do not publish per-unit counts). See the 4B exam breakdown.

2 free 4B B-1 questions, explained

Original exam-style questions written to the public syllabus, from our free public sample. They are not questions from a real exam.

1. Two ground metal surfaces resting together still resist relative motion. What is the underlying cause of this friction?

  • A. Interlocking of microscopic surface irregularities on each face
  • B. Chemical bonding of the surface oxide layers that form on the metals
  • C. Static electric charge building up across the metal contact area
  • D. A vacuum that forms tightly between the two flat faces
Show the answer and explanation

Answer: A. Even smooth surfaces have microscopic hills and valleys. These irregularities interlock and resist relative motion; a lubricant separates the surfaces to reduce that friction.

Question ID KE-B01-C01-Q001 · Unit B-1: Lubrication and Bearings · Report an error

2. Which of the following is NOT a cause of antifriction bearing failure described in this unit?

  • A. Misalignment of the shaft causing uneven loading
  • B. Storing a cleaned bearing wrapped in greaseproof paper
  • C. Improper fitting that brinells the races during installation
  • D. Poor quality, incorrect, or old lubricant
Show the answer and explanation

Answer: B. Causes of antifriction bearing failure include poor or old lubricant, improper fitting (brinelling), misalignment, false brinelling, and high operating temperatures. Storing a cleaned bearing in rust preventer and greaseproof paper is a correct preservation practice, not a cause of failure.

Why the other options are not the answer

  • A. Shaft misalignment causing uneven loading is a listed cause of failure.
  • C. Improper fitting that brinells the races is a listed cause of failure.
  • D. Poor, incorrect or old lubricant is a listed cause of failure.

Question ID KE-B01-C02-Q005 · Unit B-1: Lubrication and Bearings · Report an error

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B-2: Pumps and Compressors →

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