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4B practice exam › Unit B-2

4B B-2: Pumps and Compressors

70 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: Pump and compressor types, how they run, start-up, shutdown and maintenance.

Exam theme: Lubrication, pumps, compressors and prime movers. Commonly reported share of the 100-question 4B exam: about 10 questions (unofficial; SOPEEC and ABSA do not publish per-unit counts). See the 4B exam breakdown.

2 free 4B B-2 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. Which of the following is a recognized application of pumps in an energy plant?

  • A. Removing accumulated soot from the boiler heating surfaces
  • B. Supplying feedwater to a boiler against the boiler pressure
  • C. Storing high-pressure compressed gas for use by plant instruments
  • D. Generating the electrical current that supplies the plant lighting circuits
Show the answer and explanation

Answer: B. Boiler feedwater pumps supply feedwater to the boiler and must force water against the boiler pressure. The other options describe tasks performed by generators, sootblowers, and receivers, not pumps.

Question ID KE-B02-C01-Q001 · Unit B-2: Pumps and Compressors · Report an error

2. Which task is performed as a routine MONTHLY check on an air compression system?

  • A. Checking the lubricating oil and the coolant levels on every operating day
  • B. Draining and thoroughly cleaning each lubrication and coolant system on the unit
  • C. Analyzing oil samples taken from the lubricating oil and seal oil reservoirs
  • D. Listening carefully for any unusual noises from the machine during each shift
Show the answer and explanation

Answer: C. Monthly checks include assessing the performance of all intercoolers, aftercoolers, and oil coolers; lubricating the linkage, pins, and slide bars of control valves and positioners; and analyzing oil samples from the lubricating and seal oil reservoirs. Listening for unusual noises each shift and checking the oil and coolant levels are daily checks, and draining/cleaning the lube and coolant systems is a major shutdown task.

Why the other options are not the answer

  • A. Checking oil and coolant levels is a daily check.
  • B. Draining and cleaning the lube and coolant systems is a major shutdown task, not a monthly check.
  • D. Listening for unusual noises is a daily (every-shift) check.

Question ID KE-B02-C04-Q031 · Unit B-2: Pumps and Compressors · Report an error

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