Download Special Boiler License Practice Exam Questions and Answers for Minnesota (2024/2025) and more Exams Boiler Design and Material in PDF only on Docsity!
SPECIAL BOILER LICENSE PRACTICE EXAM MINNESOTA
EXAM QUESTIONS AND ANSWERS UPDATED
(2024/2025) (VERIFIED ANSWERS)
The purpose of a safety valve on a steam boiler is to: - ANS ✓To prevent the boiler from exceeding its MAWP The control designed as a safety back up, should the operating fail is: - ANS ✓A high limit control The capacity of a safety valve used on a steam boiler is measure in: - ANS ✓pounds of steam that can be discharge in one hour. How does a pressuretrol attach to the steam space of boiler control the burner operation? - ANS ✓On pressure decrease - starts the burner. What action should an operating engineer take if a defect is discovered in a boiler requiring repairs not of a routine nature? - ANS ✓Notify the boiler inspector. Boiler are considered low pressure when? - ANS ✓Steam Boiler are not over 15 psi and liquid boiler are not over psi 160 and 250 deg. F What boiler license required is required for operating a boiler as a shift engineer in a plant having 3 boiler each 1660 sq. ft. of heating surface? - ANS ✓Second
The maximum temperature to be carried on a low pressure hot water boiler is: - ANS ✓Less than 250 f The popping pressure of a safety relief valve on a low pressure hot water heating boiler cannot exceed: - ANS ✓160 psi The bottom blow down line on a steam boiler system is located at the: - ANS ✓Lowest Point on the waterside of a steam boiler. For the purpose of rating boiler horsepower for engineer license classifications only. How many sq. ft. of heating surface shall be considered equivalent to one boiler horsepower for conventional boiler? - ANS ✓10 sq. ft. What is recommended for boilers that will be out of service a long time is a possibility of freezing? - ANS ✓A dry lay up. The rapid burning of fuel oxygen that the results in the release of heat is called? - ANS ✓Combustion On a steam boiler what is used to reduce the amount of movement of the water so the operator can get accurate reading of the water level in the gauge glass? - ANS ✓Water Column After repair work is done on the boiler what test is used to check for leaks?
- ANS ✓Hydro static test How can you tell if the sight / gauge glass isn't working properly? - ANS ✓Water move up and down slowly
when testing the LWCO on steam boiler, the burner should be firing why? - ANS ✓To see if the burner shuts off How often should safety valves be tested on a low pressure boiler? - ANS ✓Quarterly (90 days) For high pressure boilers, a year is defined as? - ANS ✓2000 hours The low water fuel cut off is most important electrical/mechanical devices on a boiler, it should be tested? - ANS ✓Daily What should be posted in the boiler room? - ANS ✓Boiler licenses and Inspection certificate or exception certificate The ASME Code states that boilers with over_______square of heating surface must have 2 or more safety valves? - ANS ✓500 sf A____ valve is a that permits fluid flow in only one direction and closes automatically to prevent blackflow - ANS ✓Check Minnesota state statue defines a "year" as _______ for low pressure heating boiler? - ANS ✓12 months - to includes the heating season and the reminder maintaining the LP boiler In accordance with the statutes for the state of Minnesota, one boiler horsepower for steam coil type generator is equal to _______? - ANS ✓5 sq. ft. of boiler heating surface. For licensing purposes, when the boiler heating surface cannot be discerned, the boiler horsepower shall be determinated by dividing the BTU input by______? - ANS ✓67,
In accordance with the statues of the Minnesota, each electric boiler horsepower is equal to ___kilowatts? - ANS ✓ 10 The shift engineer of a high pressure boiler plant of over 200 HP must stay within____of boiler room at all times during the shift? - ANS ✓ 500 A high pressure boiler must have two means of feed water supply if it exceeds_______horsepower? - ANS ✓ 50 The low water cut off (LWCO) is a device fitted to the boiler to shut the_________________? - ANS ✓Fuel supply to the burners if the water level becomes too low A high pressure boiler of 25 HO should be checked every? - ANS ✓24 hrs. The first and most important task for a boiler operator entering a boiler room is to check the ______ of all boilers on-line? - ANS ✓Water level The low-water fuel cut off is tested by blowing its float chamber or doing a(n) ______test? - ANS ✓Evaportaion According to the Minnesota boiler statues a high pressure boiler plant 31 to 200 horsepower may be left in operation unattended by an operating engineer for no more than _______consecutive hours when the permisses are occupied by employees or the public? - ANS ✓Two In most US jurisdictions , a(n)________boiler inspection is mandated by law? - ANS ✓Annual
Boiler and boiler fitting used in the state of Minnesota must be constructed to what code? - ANS ✓A.S.M.E What controls the starting ans stopping of the burner by sending the temperature of the water in a hot water boiler? - ANS ✓Aqua Stat When a hydrostatic test of a boiler exceeds the maximum allowed working pressure each safety valve, if left attached to the boiler, should: - ANS ✓Have its valve disc held to its seat by means of testing clamp or "gag" Heat can be transferred in three ways and they are: - ANS ✓Conduction -- Convection - Radiation The first sequence in the series of automatic burner control is: - ANS ✓Purging Can a low water low water condition i a hot water heating type boiler? - ANS ✓Yes, for numerous reasons Other than a safety relieve valve what other safety device should be installed on a hot water heating boiler? - ANS ✓Low water cut off Each boiler in a battery (pipe together sharing the same common header) must have: - ANS ✓A main stem stop what removes air from a hot water boiler system? - ANS ✓Air Control In a stem boiler system, the unit that turns be burner on and off based on steam pressure is the: - ANS ✓Pressure Control
If water in the gauge is not visible because of failure of the feed water supply, what should be done? - ANS ✓Shut off the fuel to the burner and secure the boiler. What conditions are necessary to cause a furnace explosion? - ANS ✓Accumulation of unburned fuel, oxygen and an ignition source The LWCO should be tested: - ANS ✓Daily Gauge pressure plus 14.7 psi is called what? - ANS ✓Absolute pressure The evaporation of 34.5 ponds of water per hour from and at a temperature of 212 degrees Fahrenheit is defined as: - ANS ✓One boiler horsepower When a safety valve opens and closes rapidly it is referred to as - ANS ✓Chattering Furnace explosions are caused by a buildup of combustible gases, or vapors in the combustion chamber, what is the term used to remedy this condition? - ANS ✓Purging Why is a pigtail or siphon required in steam pressure gauge lines? - ANS ✓to protect the gauge from a high temperature. In a stem boiler system, what is the term used for replacing the water that has been lost by blowing down the boiler through leaks in the system? - ANS ✓A make up water On steam boiler system, why are bottom blow down valves installed at the lowest point of the waterside of boilers? - ANS ✓To remove sludge and sediment.
