Book 1: 1-02 "Cast-Iron Sectional and Modular Boilers"

Question 1

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

Answer 1

C. Push nipple

Question 2

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

Answer 2

E. Most typically connected in parallel between the supply and return header

Question 3

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

Answer 3

B. The boilers are more expensive than customary boilers

Question 4

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

Answer 4

E. Sealed with a high temperature rope gasket

Question 5

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

Answer 5

E. Increase heat transfer

Question 6

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

Answer 6

B. Exposing as large a surface as possible to the hot gases

Question 7

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

Answer 7

D. Consists of a number of horizontal sectional cast-iron boilers

Question 8

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

Answer 8

E. Tie rods

Question 9

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

Answer 9

C. In sequence by a step controller

Question 10

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

Answer 10

E. Continuous full load

Question 11

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

Answer 11

B. The choice of assembly location

Question 12

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

Answer 12

B. Push nipples

Question 13

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

Answer 13

B. The boilers are more expensive than customary boilers

Question 14

Cast-iron sectional boilers have flue gas passages which:
Select one:

A. Are smooth to increase combustion gas flow

B. Receive radiant heat only

C. Act as boiler water legs

D. Increase heat transfer

E. Are often termed “breeching”

Answer 14

D. Increase heat transfer

Question 15

Cast-iron boiler sections maximize heat transfer by:
Select one:

A. Using four push nipples per section

B. Using a large economizer

C. Vertical firing

D. Utilizing an external furnace

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

Answer 15

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

Question 16

To prevent flue gases from escaping the spaces between the cast-iron sections are:
Select one:

A. Caulked with a high temperature sealant

B. Sealed with a high temperature rope gasket

C. Covered by the metal lagging

D. Closed with metal strips

E. Seal welded shut

Answer 16

B. Sealed with a high temperature rope gasket

Question 17

The boilers or modules in a multiple heating boiler plant are:
Select one:

A. Most typically connected in parallel after the supply header

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

C. Fired by a common burner control system

D. Most typically connected in parallel before the return header

E. Most typically connected in series between the supply and return header

Answer 17

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

Question 18

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. Push nipple

C. Tapered bushing

D. Pipe nipple

E. Tie rod

Answer 18

B. Push nipple

Question 19

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

Answer 19

E. Most low capacity can be moved through standard sized doorways

Question 20

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

Answer 20

A. In sequence by a step controller