Quiz Flashcards
Steam is formed when water is heated to its boiling point
True
Water begings to boil at 212f at atmospheric pressure
True
In a scotch marine boiler the gases of combustion pass through tubes that are sorrumded by water
True
Oxygen is needed to burn fuel
True
Condensate is typically return to the boiler for reuse
True
The steam system supply water to the boiler
False
Heat is generated in a boiler by the combustion of a fuel such as gas, fuel, oil, or coal
True
Heat always flow from a material having a higher temperature to a material having a low temperature
True
Laten heat identified by a change os state and no temperature to change of the sustance
True
Conduction is heat tranfer that occurs when molecules in a material are heated and the heat is passed frommolecules to molecules
True
The ASME code governs boiler design, material, methods of construction inspection and quality assurence
True
Approximately 212 lb of air are required to burn a pound of fuel
False
A low pressure boiler is a boiler that has an MAWP over 15 psi
False
A package boiler is a self-contained unit that is preassembled at the factory
True
________is necessary to generate steam in a boiler
Water
The_____is the part of the boiler with water on one side and heat on the other
Heating surface
A_____boiler has a heat and gases of combustion that pass through tubes surround by water
Firetube
A_____boiler has waterin the tubes and heat and gases of combustion passing around the tubes
Watertube
______are used in boiler to direct the gases of combustion over the boiler heating surface
Baffles
Sensible heat is heat that_____
Can be measured with a thermometer
A_____is used to tranfer heat from one substance to another without allowing the material to mix
Heat exchanger
In the____air mixes with fuel and burns
Combustion chamber
_____combustion is combustion that occurs when fuel is burned using only the theoretical amount of air
Perfect
_____air is a air that controls the combustion rate, which determines the amount of fuel burned
Primary
The breaking up of fuel into small particles to maximaze contacts of fuel with air for combustion is _____
Atomization
The_____system provides the air necessary for combustion
Draft
The_____is the highest pressure in pounds per squeee inch at which a boiler can safely be operated
MAWP
A_____boiler does not use tubes
Cast iron
To increase efficiency of the boiler,_____
The heating surface is increased in size
The four systems necessary to operatea boiler are ___,___,___,and___.
Feedwater, fuel, draft, steam
____pressure is the pressure caused by the weight of air surrounding the earth
Atmospheric pressure
During operation, a boiler_____.
Holdswater, transfer heat to the water to produce steam, collects steam that is produced,
Water turns to steam at____f atmospheric pressure
212 f
_____Boilers have sections that can be assembled on-site to produce the boiler capacity required
Cast iron
The amount of energy requiered to raise the temperature of 1 lb of water at 1f is one ____
BTU
Heat is tranfered by_____
Conduction,
convection,
Radiation
A____is a component directly attached to the boiler that is requiered for the operation of the boiler
Fitting
The nonflamable material used to insulate the outer surface of boiler from heat is_____
Refractory
A firetube boiler that has a long cylindrical shape is a_____boiler
Scotch marine