DC Boiler Exam Prep 2015 Questions with Correct Answers (Already Graded A+)
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Module
DC Boiler
Institution
DC Boiler
DC Boiler Exam Prep 2015 Questions with Correct Answers (Already Graded A+)
How much pressure is applied to a boiler during a hydrostatic test? - Answer- 1-1/2 times the MAWP
The size of the bottom blowdown lines can be reduced when ______. - Answer- the boiler has less than 100 ft² of heating...
DC Boiler Exam Prep 2015 Questions
with Correct Answers (Already
Graded A+)
How much pressure is applied to a boiler during a hydrostatic test? - Answer- 1-1/2
times the MAWP
The size of the bottom blowdown lines can be reduced when ______. - Answer- the
boiler has less than 100 ft² of heating surface
What four things are required for complete combustion of fuel? - Answer- mixture,
atomization, temperature, and time
What compound when found in the flue gas is a sign of incomplete combustion? -
Answer- Carbon Monoxide
What device is used to check boiler combustion efficiency? - Answer- Orsat analyzer
What type of valve is best used for throttling service? - Answer- Globe valve
What is necessary to burn the volatile matter in coal more efficiently? - Answer- overfire
air
What is required to burn pulverized coal efficiently? - Answer- a high furnace
temperature
A sudden increase in stack temperature without a corresponding increase n steam
demand indicates what? - Answer- a broken baffle
What percentage of steam generated in a boiler is used for the steam atomizing burner?
- Answer- 4%
What does a proximate analysis of coal determine? - Answer- weight of moisture, fixed
carbon, volatile matter, and ash content
Try cocks are not effective above what steam pressure? - Answer- 250 psi
What test determines if the safety valve(s) of a steam boiler have sufficient relieving
capacity? - Answer- accumulation test
, Carbon dioxide in flue gas is an indication of what? - Answer- complete combustion
An economizer is used to heat? - Answer- feedwater
The scanner must be mounted on the front of the burner so that it sights_____? -
Answer- both the pilot and the main flame
How often should an evaporation test be performed to check the low water fuel cut off
safety? - Answer- monthly
According to ASME Code, what must a boiler with more than 500 ft² of heating surface
have? - Answer- two or more safety valves
To cut a boiler on line that is equipped with hand operated main steam stop valves, the
steam pressure on the incoming boiler should be _______. - Answer- slightly lower than
the line pressure
After replacing the gauge glass but before placing it in service, it is necessary to _____.
- Answer- crack open the steam valve and warm the glass
What protects a steam pressure gauge from the high temperature of the steam? -
Answer- a siphon
What is the minimum size of a manhole on a boiler? - Answer- 11" x 15"
The amount of excess air in gases of combustion is normally determined by the analysis
of ____. - Answer- O2
Equivalent evaporation = - Answer- Ws x FE
Ws = weight of steam in lbs/hr
FE = Factor of evaporation
What is the purpose of a bridge wall in the furnace of an HRT boiler? - Answer- To
direct the gases of combustion for better contact with the shell of the boiler.
What are the two classifications of vertical firetube boilers? - Answer- wet-top and dry-
top
What are the three types of heat transfer? - Answer- Radiation, Convection, and
Conduction
The badge plate on a boiler will contain what information? - Answer- Date built, ASME
Symbol Stamp, Model Number, Heating Surface, Serial Number, MAWP, Burner Design
Fuels, National Board of Boiler & Pressure Vessel Inspector's Registration Number,
Burner Rating in Btu input
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