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Stationary / power engineer (classes 1 to 4) practice test

191 free practice questions for this exam, each with the reason for the answer and where to look it up.

Boiler operator and stationary engineer: practice test

10 questions, graded as you go, with the reason for every answer. No sign-up.

Practice tests that prepare you for this exam

Boiler operator and stationary engineer

Boiler types and fittings, combustion, feedwater and water treatment, steam systems, operation, safety devices and emergencies for low and high pressure boiler licences.

191 questions for this exam

About the exam

ExamStationary / power engineer (classes 1 to 4)
Who runs itState and city boards, NIULPE
WhereUnited States (varies by state)

Question count, time limit and pass mark differ by where you take it. Check the official candidate bulletin from the organisation that runs your exam.

Sample questions

A hot-water heating boiler is classed as low pressure when it does not exceed which limits?

  1. 160 psi and 212°F
  2. 125 psi and 250°F
  3. 30 psi and 250°F
  4. 160 psi and 250°F
Show the answer

D. 160 psi and 250°F

The heating boiler rules cover hot-water boilers up to 160 psi and 250°F. 212°F is only the boiling point at atmospheric pressure; water under pressure can be hotter and still be within the low-pressure class.

Reference: ASME BPVC Section IV, scope (160 psi, 250°F water)

What is the effect of running a burner with far more excess air than it needs?

  1. More heat is carried up the stack
  2. More soot forms in the tubes
  3. The flame becomes long and smoky
  4. The fuel flow rises to compensate
Show the answer

A. More heat is carried up the stack

Air that takes no part in combustion is heated in the furnace and carries that heat out of the stack, so efficiency drops. Soot and a smoky flame are signs of too little air, the opposite fault.

Reference: Combustion: excess air and stack loss

Why is it worthwhile to return as much condensate as possible to the boiler?

  1. It is cold and dense, so it pumps more easily
  2. It is hot and pure, saving fuel and treatment
  3. It is high in oxygen, which protects the tubes
  4. It is high in hardness, which coats the shell
Show the answer

B. It is hot and pure, saving fuel and treatment

Condensate is nearly distilled water that still holds a good deal of heat, so reusing it cuts fuel, makeup water and chemical use. It is not cold; it normally returns well above the makeup water temperature.

Reference: Feedwater systems: condensate return

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