A-11 Intro To Boiler Designs Flashcards
In a modular heating boiler plant, how are the boilers connected?
A. In parallel between the supply and return header
B. In series between the supply and return header
C. Side by side like slices in a loaf of bread
D. Using tie-rods to hold them together
A. In parallel between the supply and return header
What is the capacity of an immersion electric boiler limited to?
A. 1000 kW and 2100 kPa
B. Lower capacity and pressure
C. Situations of only high process steam demand
D. Places where electricity is cheap
B. Lower capacity and pressure
Which one of the following is NOT an advantage of a packaged firetube boiler?
A. Large enough to provide steam for large-scale power generation
B. Lower purchase price because they are mass produced
C. Quality can be ensured prior to delivery
D. The boilers can be factory tested before being sent to the customer
A. Large enough to provide steam for large scale power generation
For the same kilojoule relief capacity, what size should the heating boiler safety valve (pressure relief valve) be?
A. Similar to a power boiler safety valve
B. Half the size of a power boiler safety valve
C. Larger than a power boiler safety valve
D. Smaller than a power boiler safety valve
C. Larger than a power boiler safety valve
Manholes are:
A. Installed on all boilers
B. Provided for inspection purposes
C. Always circular in shape
D. Installed on fossil fired boilers only
B. Provided for inspection purposes
The largest packaged watertube boilers available are around what size?
A. 73 000 kW
B. 72 000 kW
C. 27 000 kW
D. 37 000 kW
A. 73 000 kW
Where is water tube boiler feedwater piped to?
A. Risers
B. Steam drum
C. Downcomers
D. Mud drum
B. Steam drum
Boilers are designed with more combustion gas passes:
A. Because boiler tubes cannot be manufactured in great lengths
B. To allow more time for heat transfer
C. So soot falls out in the last pass, leaving the first pass clear
D. To create less thermal stress on the boiler metal
B. To allow more time for heat transfer
The amount of current passed through the water of an electrode boiler depends on the:
A. Depth of the electrodes in the water
B. Control valve setting
C. Speed of the circulating pump
D. Voltage setting of the pressure control
A. Depth of the electrodes in the water
A hot water boiler is considered a high temperature water boiler when:
A. It’s design pressure is less than 1100 kPa
B. It’s operating temperature is greater than 120 degrees C
C. It’s operating temperature is less than 120 degrees C
D. It’s energy input exceeds 58.7 kW
B. Its operating temperature is greater than 120 degrees C
Bent water tubes surround the furnace, thus absorbing more _____
A. Convection heat
B. Conduction heat
C. Radiant heat
D. Heat transfer
C. Radiant heat
With regard to a steam boiler, the term “HRT” means:
A. Highly regulated temperature
B. Hot return tubes
C. Horizontal return tubular
D. Horizontal receiver tubes
C. Horizontal return tubular
Electric boilers:
A. Are low pressure boilers only
B. Do not need gauge glasses
C. Do not need a chimney
D. Are economical to operate
C. Do not need a chimney
Bent tube watertube boilers:
A. Cannot have the furnace water-lined
B. Furnaces are lined with water tubes to absorb more radiant heat from the fire
C. Are externally fired
D. Cannot be fitted with heat recovery components
B. Furnaces are lined with water tubes to absorb more radiant heat from the fire
Expanding of tubes into a tube sheet is also called:
A. Beading
B. Rolling
C. Flaring
D. Peening
B. Rolling
To prevent flue gas leakage from the furnace of a packaged watertube boiler:
A. An induced draft fan is incorporated
B. Smoke stacks are made taller
C. An Economizer is used
D. A steel casing forms a seal for the furnace
D. A steel casing forms a seal for the furnace
A characteristic that made early boilers very inefficient was:
A. Small heating surface
B. An excess of flat surfaces
C. The internal furnace
D. Lack of good quality fuels
A. Small heating surface
The purpose of a superheater is to:
A. Produce high pressure steam
B. Increase the steam output
C. Increase the temperature of the steam
D. Control the pressure of the steam
C. Increase the temperature of the steam
The steam and water spaces of a cast iron sectional are connected by:
A. Tie rods
B. Tie nipples
C. Hydraulic jacks
D. Push nipples or gaskets
D. Push nipples or gaskets
The distribution pipe that injects feedwater inside a boiler:
A. Must be made of at least schedule 80 pipe
B. Is arranged to refuse thermal shock in the drum
C. Introduces the feedwater against the radiant heating surfaces of the boiler
D. Improved the separation of steam and water
B. Is arranged to reduce thermal shock in the drum
