Book 1: 1-02 "Cast-Iron Sectional and Modular Boilers" Flashcards
A machined and slightly tapered piece of pipe found in cast-iron sectional heating boilers is referred to as a:
Select one:
A. Tie bolt
B. Tapered bushing
C. Push nipple
D. Tie rod
E. Pipe nipple
C. Push nipple
The boilers or modules in a multiple heating boiler plant are:
Select one:
A. Most typically connected in parallel after the supply header
B. Fired by a common burner control system
C. Most typically connected in parallel before the return header
D. Most typically connected in series between the supply and return header
E. Most typically connected in parallel between the supply and return header
E. Most typically connected in parallel between the supply and return header
A disadvantage of condensing boilers is that:
Select one:
A. Any moisture in the flue gases will not condense out
B. The boilers are more expensive than customary boilers
C. The boilers are less expensive than customary boilers
D. The heat exchangers in them are quite small
E. Less heat is extracted from the hot flue gases
B. The boilers are more expensive than customary boilers
To prevent flue gases from escaping the spaces between the cast-iron sections are:
Select one:
A. Closed with metal strips
B. Caulked with a high temperature sealant
C. Seal welded shut
D. Covered by the metal lagging
E. Sealed with a high temperature rope gasket
E. Sealed with a high temperature rope gasket
Cast-iron sectional boilers have flue gas passages which:
Select one:
A. Are often termed “breeching”
B. Act as boiler water legs
C. Receive radiant heat only
D. Are smooth to increase combustion gas flow
E. Increase heat transfer
E. Increase heat transfer
Cast-iron boiler sections maximize heat transfer by:
Select one:
A. Using four push nipples per section
B. Exposing as large a surface as possible to the hot gases
C. Utilizing an external furnace
D. Vertical firing
E. Using a large economizer
B. Exposing as large a surface as possible to the hot gases
A modular cast-iron heating boiler:
Select one:
A. Cannot be enclosed in a single casing
B. Is constructed with a number of individual sections
C. Does not have continuous water flow through each section
D. Consists of a number of horizontal sectional cast-iron boilers
E. Has a number of burners that operate together
D. Consists of a number of horizontal sectional cast-iron boilers
Cast-iron sectional boilers are held tightly together by means of:
Select one:
A. Push nipples
B. Tapered bushings
C. Pipe flanges
D. Pipe nipples
E. Tie rods
E. Tie rods
The boilers in multiple boiler heating plants are operated:
Select one:
A. By the outdoor temperature
B. By temperature controllers
C. In sequence by a step controller
D. Manually as required
E. Individually by separate controllers
C. In sequence by a step controller
Small capacity heating boilers operate most efficiently at:
Select one:
A. Approximately 25% load
B. Approximately 75% load
C. Any load condition
D. Approximately 50% load
E. Continuous full load
E. Continuous full load
An advantage of a cast-iron sectional boiler is:
Select one:
A. Its ability to withstand high pressure
B. The choice of assembly location
C. Small fixed size
D. Their large capacity
E. Light weight requiring a minimal foundation
B. The choice of assembly location
The boilers in multiple boiler heating plants are operated:
Select one:
A. In sequence by a step controller
B. By the outdoor temperature
C. Individually by separate controllers
D. By temperature controllers
E. Manually as required
A. In sequence by a step controller
An advantage of a multiple heating boiler plant is:
Select one:
A. They are light requiring a minimal foundation
B. That with a small water content a pressure part failure will cause more damage
C. That they have a large water capacity
D. The boilers are heavy requiring special foundations
E. Most low capacity can be moved through standard sized doorways
E. Most low capacity can be moved through standard sized doorways
Cast-iron sectional boilers are connected by means of:
Select one:
A. Screw jacks
B. Push nipples
C. Tie rods
D. Pipe nipple
E. Tapered bushing
B. Push nipples
A disadvantage of condensing boilers is that:
Select one:
A. Less heat is extracted from the hot flue gases
B. The boilers are more expensive than customary boilers
C. The boilers are less expensive than customary boilers
D. The heat exchangers in them are quite small
E. Any moisture in the flue gases will not condense out
B. The boilers are more expensive than customary boilers
