Chapter 1-4 Flashcards
(23 cards)
The package firetube boiler (modified scotch boiler) is of a type called\_\_\_\_\_? A) Tubular steam boilers B) Horizontal firetube boilers C) Vertical firetube boilers D) Vertical tubeless boilers E) Horizontal return type boilers
B) Horizontal firetube boilers
The steam and water spaces of the sections of a cast iron boiler are connected by\_\_\_\_\_? A) Diagonal stays B) Push nipples C) Hydraulic jacks D) Steed studs E) Through stays
B) Push nipples
What is the upper drum of a packaged watertube steam boiler referred to as\_\_\_\_\_? A) Mud drum B) Disc drum C) Water drum D) Steam drum E) Top header
D) Steam drum
Boiler shells are made with\_\_\_\_\_? A) Brass B) Alloy steel C) Bronze D) White metal E) Stainless steel
B) Alloy steel
The part of the boiler that has water on one side and the fire or hot gases on the other is called the\_\_\_\_\_? A) Superheater B) Water column C) Baffle D) Uptake E) Heating surface
E) Heating surface
The boiler in which the combustion gases travel through the furnace tubes to the rear, then reverse and return to the front of the boiler through tubes then exit through the stack is termed a\_\_\_\_\_? A) Single pass boiler B) Reverse pass boiler C) Three pass boiler D) Four pass boiler E) Two pass boiler
E) Two pass boiler
In a firetube boiler the tubes are beaded over against the tube sheet to_____?
A) Strengthen the tubesheet
B) Contain the expansion of the tubes
C) Prevent the tube ends from being overheated and burned
D) To holth the tubesheets together
E) To ensure a smooth weld
C) Prevent the tube ends from being overheated and burned
The part of the boiler furnace where the fuel gases are mixed with air and burned is named the \_\_\_\_\_? A) Uptake B) Windbox C) Setting D) Combustion chamber E) Mixing zone
D) Combustion chamber
In order to increase the strength of the furnace tube of a firetube boiler, the furnace tube is \_\_\_\_\_? A) Riveted B) Corrugated C) Made from cast iron D) Insulated E) Post heated
B) Corrugated
The process used to harden the surface of low carbon steel is called\_\_\_\_\_? A) Carbonizing B) Annealing C) Tempering D) Stress relieving E) Post heat treatment
A) Carbonizing
Materials that are very soft and easily worked are said to be\_\_\_\_\_? A) Brittle B) Plastic/Ductile C) Work hardened D) Eastile E) Malleable
B) Plastic/Ductile
Which of the following boilers produce no pollution such as smoke, dust and ashes? A) An oil fired boiler B) A coal fired boiler C) A gas fired boiler D) An electric boiler E) A fluidized be boiler
D) An electric boiler
One advantage a firetube boiler has over a watertube boiler is that_____?
A) Impurities in the feedwater are less detrimental
B) It can provide steam more rapidly
C) It is better suited for high pressure
D) It is generally more accessible for cleaning, inspection and repair
E) It can operate on automatic control
A) Impurities in the feedwater are less detrimental
Stays are not normally required in watertube boilers because_____?
A) This type of boiler can be built without flat surfaces
B) They operate at a lower pressure
C) The drum internals support
D) The tubes are thicker
E) The are top supported
A) This type of boiler can be built without flat surfaces
Generally boiler tubes used for high pressure service are\_\_\_\_\_? A) Riveted B) Made from cast iron C) Seamless D) Corrugated E) Made of copper F) Circulate
C) Seamless
To prevent the flat surfaces of a firetube boiler from bulging they_____?
A) Require the pressure of the flue gases and the steam to be equal
B) Have to be hydrotested
C) Have to be supported by stays
D) Have handholds installed
E) Support rigid construction
C) Have to be supported by stays
To prevent the flue gases from escaping, the spaces between the sections are_____?
A) Welded using #147Z1-2 Rod
B) Sealed with high-temperature putty
C) Bolted with silicone gaskets
D) Sealed with high-temperature ceramic-based rope or gasketing
E) Packed with oakum and lead
D) Sealed with high-temperature ceramic-based rope or gasketing
One reason a number of modular type boilers are more efficient than a single boiler is_____?
A) Only one header is required
B) There are safety valves on each module
C) As the load increases more modules are automatically put into service
D) At low loads each module operates a lower lever
E) The more modules the higher the pressure
C) As the load increases more modules are automatically put into service
Heating boilers attain maximum efficiency only when operated\_\_\_\_\_? A) For longer than 15 minutes B) Continuously at full load C) Continuously at low load D) Intermittently for 15 minutes E) On electricity
B) Continuously at full load
Boiler efficiency is the percentage of the heat released during combustion that is actually_____?
A) Radiated to the building occupants
B) Converted to the boiler water
C) Converted to the building and occupants
D) Transferred to the boiler water
E) Rejected to the boiler water
D) Transferred to the boiler water
A flue collar outlet on a boiler is often called\_\_\_\_\_? A) The primary gas outlet B) Breeching C) Atmospheric vent outlet D) A-vent outlet E) Primary vent
B) Breeching
Increasing the \_\_\_\_\_ or \_\_\_\_\_ will provide maximum heat transfer of the flue gases to the heating medium as they travel through a boiler. A) Surface area; contact time B) Fuel capacity; air to fuel ratio C) Air to fuel ratio; secondary air D) Water flow rate; fuel capacity E) Chimney size; fuel capacity
A) Surface area; contact time
Heating boilers are built to\_\_\_\_\_? A) B52 Code B) The clients specifications C) The design load of the system D) The mechanical engineers specifications E) ASME code Section 4
E) ASME code Section 4
