Book 1 Chapter 2: Cast-Iron Sectional And Modular Boilers

Question 1

Cast-iron sectional boilers have flue gas passages which:
A) are often termed “breeching”
B) increase heat transfer
C) receive radiant heat only
D) act as boiler water legs

Answer 1

B) increase heat transfer

Question 2

A machined and slightly tapered piece of pipe found in sectional heating boilers is referred to as a:
A) tie rod
B) tapered bushing
C) push nipple
D) clean out nipple

Answer 2

C) push nipple

Question 3

An advantage of a cast iron boiler is:
A) it’s large capacity
B) light weight resulting in lesser foundation requirements
C) it’s ability to withstand high pressure
D) the choice of assembly location

Answer 3

D) the choice of assembly location

Question 4

Small capacity heating boilers operate most efficiently at:
A) continuous full load
B) any type of load
C) approximately 75% load
D) approximately 66% load

Answer 4

A) continuous full load

Question 5

A modular cast-iron heating boiler:
A) has a number of burners which start and stop simultaneously
B) consists of a number of individually operated sectional boilers
C) cannot be enclosed in a single casing
D) does not have continuous water flow through each module

Answer 5

B) consists of a number of individually operated sectional boilers

Question 6

Cast-iron boiler sections maximize heat transfer by:
A) using four push nipples per section
B) vertical firing
C) exposing as large a surface as possible to the hot gases
D) utilizing an external furnace

Answer 6

C) exposing as large a surface as possible to the hot gases

Question 7

An advantage of a cast-iron sectional boiler is:
A) It’s ability to withstand high pressure
B) Small fixed size
C) Their large capacity
D) Light weight requiring a minimal foundation
E) The choice of assembly location

Answer 7

E) The choice of assembly location

Question 8

An advantage of a multiple heating boiler plant is:
A) That they have a large water capacity
B) The boilers are heavy requiring special foundations
C) That with a small water content a pressure part failure will cause more damage
D) Most low capacity can be moved through standard sized doorways
E) They are light requiring a minimal foundation

Answer 8

D) Most low capacity can be moved through standard sized doorways

Question 9

Cast-iron sectional boilers are held tightly together by means of:
A) Pipe nipples
B) Pipe flanges
C) Tapered bushings
D) Push nipples
E) Tie rods

Answer 9

E) Tie rods

Question 10

A disadvantage of condensing boilers is that:
A) The heat exchangers in them are quite small
B) Any moisture in the flue gases will not condense out
C) The boilers are more expensive than customary boilers
D) Less heat is extracted from the hot flue gases
E) The boilers are less expensive than customary boilers

Answer 10

C) The boilers are more expensive than customary boilers

Question 11

The boilers or modules in a multiple heating boiler plant are:
A) Fired by a common burner control system
B) Most typically connected in parallel between the supply and return header
C) Most typically connected in series between the supply and return header
D) Most typically connected in parallel after the supply header
E) Most typically connected in parallel before the return header

Answer 11

B) Most typically connected in parallel between the supply and return header

Question 12

Cast-iron boiler sections maximize heat transfer by:
A) Using a large economizer
B) Vertical firing
C) Using four push nipples per section
D) Utilizing an external furnace
E) Exposing as large a surface as possible to the hot gases

Answer 12

E) Exposing as large a surface as possible to the hot gases

Question 13

A machined and slightly tapered piece of pipe found in cast-iron sectional heating boilers is referred to as a:
A) Tie bolt
B) Pipe nipple
C) Push nipple
D) Tie rod
E) Tapered bushing

Answer 13

C) Push nipple

Question 14

The boilers in multiple boiler heating plants are operated:
A) Manually as required
B) In sequence by a step controller
C) By the outdoor temperature
D) Individually by separate controllers
E) By temperature controllers

Answer 14

B) In sequence by a step controller

Question 15

Cast-iron sectional boilers are connected by means of:
A) Screw jacks
B) Tapered bushing
C) Pipe nipples
D) Tie rods
E) Push nipples

Answer 15

E) Push nipples

Question 16

Cast-iron sectional boilers have flue gas passages which:
A) Are often termed “breeching”
B) Act as boiler water legs
C) Are smooth to increase combustion gas flow
D) Receive radiant heat only
E) Increase heat transfer

Answer 16

E) Increase heat transfer

Question 17

Two methods of assembling a cast iron sectional boiler are:
A) Cable ties and winch
B) Flange bolts and gaskets
C) Short and long tie rods
D) Capscrews and nuts
E) Clamps and over center locks

Answer 17

C) Short and long tie rods

Question 18

The fins cast on the flat surface of the sections of a cast iron sectional boiler are used for the purpose of increasing the:
A) Steam output
B) Heat transfer effectiveness
C) Steam capacity
D) Water capacity
E) Water circulation

Answer 18

B) Heat transfer effectiveness

Question 19

The sections of cast iron boilers are mainly designed to obtain maximum:
A) Heat transfer
B) Steam output
C) Water circulation
D) Water space
E) Steam space

Answer 19

A) Heat transfer

Question 20

Cast iron boiler section watersides are connected and sealed by:
A) Pipe plugs
B) Polished surfaces
C) Flanges
D) Threaded connections
E) Tapered push nipples

Answer 20

E) Tapered push nipples

Question 21

The capacity of cast iron boilers:
A) Can be changed by increasing gas pressure
B) Can be increased by adding sections
C) Can be changed by installing larger pumps
D) Can be changed by adding more burners
E) Cannot be changed

Answer 21

B) Can be increased by adding sections

Question 22

Front and rear sections of cast iron sectional boilers differ from intermediate sections by having:
A) Push nipples on one side only
B) No water surface
C) No gas passages
D) No clean outs
E) Bottom supports

Answer 22

A) Push nipples on one side only

Question 23

High temperature ceramic based rope or gasket in is used during assembly of cast iron sectional boilers to:
A) Seal the intake are vents
B) Seal the exhaust flue
C) Seal the spaces between sections
D) Seal around the burners
E) Seal the water connections

Answer 23

C) Seal the spaces between sections

Question 24

Cast iron boilers:
A) Are relatively susceptible to corrosion
B) Are suitable for high pressures
C) Are constructed in sections
D) Are not used today
E) Must be located in a building basement

Answer 24

C) Are constructed in sections

Question 25

For cast iron modular boilers the operation of each individual burner is controlled by:
A) The outdoor temperature controller
B) The water pressure controller
C) A step controller which starts modules in sequence
D) Step controller which starts all burners simultaneously
E) A single controller that controls all burners

Answer 25

C) A step controller which starts modules in sequence

Question 26

An advantage to using multiple small cast iron sectional boilers in a heating plant is:
A) The thermal efficiency of the plant is considerably improved
B) It is capable of operating at very high pressure
C) They require higher pressure air
D) The flue gas is corrosive
E) They don’t require maintenance

Answer 26

A) The thermal efficiency of the plant is considerably improved