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4A practice exam › Unit A-11

4A A-11: Introduction to Boiler Designs

52 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: Boiler history and design: firetube, watertube, electric and heating-plant boilers, ASME Section I vs IV.

Exam theme: Boilers and boiler systems. Commonly reported share of the 100-question 4A exam: about 15 questions (unofficial; SOPEEC and ABSA do not publish per-unit counts). See the 4A exam breakdown.

1 free 4A A-11 question, explained

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

1. How do the locomotive boiler and the horizontal return tubular (HRT) boiler differ in their number of flue gas passes?

  • A. The locomotive boiler is a two-pass design and the HRT boiler is a single-pass design.
  • B. The locomotive boiler is a three-pass design and the HRT boiler is a two-pass design.
  • C. The locomotive boiler is a single-pass design and the HRT boiler is a two-pass design.
  • D. Both are two-pass designs, but the locomotive boiler fires internally while the HRT fires externally.
Show the answer and explanation

Answer: C. The locomotive boiler is a single-pass design: flue gas travels in one direction from burner to stack. The HRT (horizontal return tubular) boiler is a two-pass design, with combustion gases making two passes on their way to the chimney.

Question ID KE-A11-C02-Q003 · Unit A-11: Introduction to Boiler Designs · Report an error

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