Stationary Engineer Prep Exam: Questions and Answers, Exams of Engineering

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Entrances and exits or access to boilers may be through conditioned spaces which are under negative pressure. (True/False) - Answer- False All repairs made by welding shall be completed in accordance with the recommended rules for repair by fusion welding to power boilers published in the: - Answer- National Board Inspection Code A low water level condition in a steam boiler may cause: - Answer- overheating of the boiler heating surfaces New boilers shall have an approved manual shut off valve with a handle: - Answer- within 3 feet of the boiler gas train The purpose of a water column in a steam boilers is to increase water movement in the gauge glass. (True/False) - Answer- False Positions #1-4 on the boiler code review and licensing board are appointed by the: - Answer- Mayor and confirmed by City Council Superheaters are used to increase pressure in a boiler. (True/False) - Answer- False All boilers are required to have a water column. (True/False) - Answer- False A permit is required for a portable boiler intended for temporary use. (True/False) - Answer- True A permit shall be obtained from the city of Houston prior to installation,re-installation, alteration, repair, or replacement boilers. (True/False) - Answer- True Spray type desuperheaters are used in conjunction with a pressure reducing station. (True/False) - Answer- True Thermal steam traps (thermostatic) can be used in both high and low pressure steam plants. (True/False) - Answer- True

A thermohydraulic feedwater regulator operates when a boiler water leave increases or decreases. (True/False) - Answer- True Except on automatic boilers with prepurge/automatic controls and dampers, on oil and solid fuel boilers when you put the damper in the closed position: - Answer- it should be closed no more than 80% Tubular gauge glasses are used on boilers up to and including 250 PSI. (True/False) - Answer- True. (Also Try-Cocks) No person shall take charge of a boiler plant with an aggregate BTUH output rating of more than 8,380,000 unless he/she has a: - Answer- 1st Grade Stationary Engineers License A steam boiler operating at ____ or more will have two blowdown valves. - Answer- 100 PSI A boiler with excessive alkalinity that causes the boiler metal to breakdown is known as:

• Answer- caustic embrittlement What temperature does the Banka-Tin in a fusible plug melt? - Answer- 450 degrees F Boilers operating at 400 PSI or more should have what type of safety valve connection?
• Answer- Flange The number .4335 related to one vertical foot of water is known as: - Answer- Hydro- static Pressure What chemical is considered an oxygen scavenger? - Answer- Sodium Sulfite Steam pressure passes through a Globe Valve, changes direction of flow the pressure is reduced. (True/False) - Answer- True What device is used to control the firing cycle of a burner? - Answer- Programmer At what frequency should the water column and low water fuel cutoff be blown down? - Answer- Daily Convection superheaters are located in the convection zone of a boiler. (True/False) - Answer- FALSE, they are located in the Radiant Zone. Economizers are located in the breeching zone of a boiler. (True/False) - Answer- True Name a device that helps prevent a furnace explosion: - Answer- Flamescanner

Define a miniature boiler: - Answer- A power boiler that has a shell diameter of 16" or less, a volume of 5 cubic feet or less, heating surface of 20 square ft or less and does not exceed 100psi of steam output. Which valve is located between the boiler shell and the pop off valve? - Answer- NONE Why does a building official visit a boiler plant? - Answer- To check that the proper Stationary Engineers License are displayed with their renewal receipts current. He will also check to see if a proper grade of Stationary Engineer is on duty at the time of his visit and he will inspect one year of log sheet readings. What device is used to calibrate a pressure gauge? - Answer- A dead-weight tester Before doing any installations, changes, revisions, etc. What must first be obtained from the city of Houston? - Answer- A permit Why is a back flow preventer required? - Answer- To prevent boiler water from backing up into the city of Houston water supply system and contaminating it. What is the minimum size of blow down piping on a power boiler? - Answer- One Inch Why is excess air required for combustion? - Answer- to insure complete combustion What is heating surface in regard to a fire tube boiler? - Answer- The area of the fire tubes, the tube sheets, and internal furnace. Why are the risks of explosion more on a fire tube boiler? - Answer- Because of the large quantity of water for a given size. What unit of measurement is the pressure below atmospheric in a compound gauge? - Answer- Inches of Mercury Welding on a boiler can be performed by: - Answer- A certified welder What is the range of a steam pressure gauge? - Answer- 1.5 to 2X the MAWP What are ways to increase thermal efficiency of a boiler? - Answer- Economizers and air pre-heaters What is the pressure for a hydrostatic test? - Answer- 1.5 X the MAWP not to exceed this pressure by more than 10PSI. What Chapter of the City of Houstons uniform mechanical code pertains to boiler installation? - Answer- Chapter 10

New boilers should have an approved manual shut off valve with a handle: - Answer- within 3 feet of the boiler gas train 3rd grade stationary engineer license - Answer- not to exceed 3,352,000 BTU per hour 2nd Grade stationary engineer license - Answer- not to exceed 8,380,000 BTU per hour Boiler Permit - Answer- not to exceed 1,676,000 BTU per hour