Book 1 Chapter 3: Firetube Boilers (Heating & Power)

Question 1

The maximum pressure for low-pressure steam boiler is:
A) 103 kPa (14.7 psi)
B) 160 kPa (23.2 psi)
C) 250 kPa (36.2 psi)
D) 1100 kPa (160 psi)

Answer 1

A) 103 kPa (14.7 psi)

Question 2

The main part of a high-pressure firetube boiler is called the:
A) windbox
B) furnance
C) shell
D) drum

Answer 2

C) shell

Question 3

The pressure and temperature limiting factors for steam units used for heating and hot water heating boilers are:
A) 121 kPa or 103C (17.5 psi or 217F) for steam units, and 1100 kPa (160psi) for hot water units
B)1100 kPa (160psi) for steam units and 103 kPa, or 121C (14.7 psi or 250F) for hot water units
C) 103 kPa (14.7 psi) for steam units and 121C, or 1100kPa (250F or 160 psi) for hot water units
D) 1100kPa or 121C (160psi or 250F) for steam units, and 1100kPa for hot water units

Answer 3

C) 103 kPa (14.7 psi or 250F) for steam units and 121C, or 1100kPa (250F or 160 psi) for hot water units

Question 4

In a vertical firetube boiler, the steam space is located:
A) in a seperate chamber
B) in a compartment on the side
C) at the lower part of the shell
D) at the top of the shell

Answer 4

D) at the top of the shell

Question 5

The forerunner of the modern packaged firetube heating boiler was the:
A) internally fired horizontal return tubular (HRT) boiler
B) internally fired Scotch Marine boiler
C) externally fired Scotch Marine boiler
D) externally fired horizontal return tubular (HRT) boiler

Answer 5

B) internally fired Scotch Marine boiler

Question 6

The chief advantage of a packaged heating boiler:
A) its compactness
B) mass production ability
C) higher pressure rating
D) its higher factor of safety

Answer 6

B) mass production ability

Question 7

In a vertical firetube boiler:
A) the water passes through the inside of the tubes
B) the steam accumulates in the lower part of the boiler shell
C) the horizontal shell has vertical firetubes at each end
D) the upper part of the tubes are cooled by steam

Answer 7

D) the upper part of the tubes are cooled by steam

Question 8

The “pipe” is a common term for:
A) the combustion chamber of a vertical tubeless boiler
B) the drain on an immersion boiler
C) the water jacket of a vertical boiler
D) the steam outlet of an electrode boiler

Answer 8

A) the combustion chamber of a vertical tubeless boiler

Question 9

In which of these boilers does the firing occur in a downward direction?
A) immersion electrode
B) vertical electric
C) vertical firetube
D) vertical tubeless

Answer 9

D) vertical tubeless

Question 10

One feature of a vertical tubeless boiler that would not be found on the vertical firetube boiler is:
A) water level control
B) burners
C) refractory
D) water column

Answer 10

C) refractory

Question 11

Steam is the cooling medium for the upper part of the tubes and the tubesheet in what type of boiler?
A) Vertical firetube
B) Vertical tubeless
C) Immersion resistance
D) Horizontal firetube
E) Circular watertube

Answer 11

A) Vertical firetube

Question 12

A wetback Scotch Marine boiler:
A) Has heating surface surrounding the end section
B) Is externally fired
C) Uses cast iron sections
D) Has a refractory covered end section
E) Has a brick setting

Answer 12

A) Has heating surface surrounding the end section

Question 13

The number of combustion gas passes in a Scotch Boiler seldom exceeds four due to:
A) Combustion air pressure
B) Chimney height
C) Stack diameter
D) Breeching leak
E) Condensation problems

Answer 13

E) Condensation problems

Question 14

The products of combustion leaving the furnace are referred to as combustion gases or:
A) Natural gases
B) Flue gases
C) Excess gases
D) Noxious gases
E) Stack gases

Answer 14

B) Flue gases

Question 15

A boiler which is built ready for installation is the:
A) HRT boiler
B) Packaged boiler
C) Locomotive boiler
D) Scotch Marine boiler
E) Firebox boiler

Answer 15

B) Packaged boiler

Question 16

A horizontal return tubular boiler is:
1. Two pass boiler
2. A watertube boiler
3. Externally fired
4. Constructed entirely of mild steel

A) 1,3
B) 1,3,4
C) 2,3,4
D) 2,4
E) 1,2,3

Answer 16

A) 1,3

Question 17

A steel plate vertical firetube unit is divided into two sections and the upper part is often called the:
A) Combustion chamber
B) Flue gas collector section
C) Expansion tank
D) Reversing section
E) Heat exchanger

Answer 17

E) Heat exchanger

Question 18

When comparing vertical and horizontal firetube boilers, a horizontal firetube boiler:
A) Is less reliable
B) Needs more air
C) Requires more feedwater for a given size
D) Requires more space for a given capacity
E) Requires less overhead space for a given capacity

Answer 18

E) Requires less overhead space for a given capacity

Question 19

Firetube boilers have their tubes fixed into flat steel plates, otherwise known as:
A) Headers
B) Shells
C) Flues
D) Tubesheets
E) Drums

Answer 19

D) Tubesheets

Question 20

On older boilers, the masonry work that tended to surround the furnace was termed the:
A) Setting of the boiler
B) Boiler masonry
C) Boiler casing
D) Boiler firebox
E) Windbox

Answer 20

A) Setting of the boiler

Question 21

A firetube boiler is a boiler in which:
A) Water passes through the tubes
B) Combustion gases pass around the tubes
C) Combustion gases pass through the tubes
D) Air passes through the tubes
E) Air passes around the tubes

Answer 21

C) Combustion gases pass through the tubes

Question 22

A ______ is a water filled section which surrounds the firebox in locomotive boilers.
A) Boiler drum
B) Buckstay
C) Water leg
D) Crown sheet
E) Steam dome

Answer 22

C) Water leg

Question 23

The maximum operating temperature of a hot water heating boiler is:
A) 160C
B) 120C
C) 200C
D) 121C
E) 100C

Answer 23

D) 121C

Question 24

A Scotch Marine boiler:
A) Cannot be fired on coal
B) Is not used in marine applications
C) Has an internal furnace
D) Is single pass
E) Is externally fired

Answer 24

C) Has an internal furnace

Question 25

Firetube boilers: A) Require special foundations or footings B) Have very specific design pressures to meet customer needs C) Have maintenance access difficulties D) Are not very rugged relative to portability E) Require relatively small floor space

Answer 25

E) Require relatively small floor space

Question 26

A hot water boiler is not considered a heating boiler unless it exceeds: 1. A capacity of 454L(120gal) 2. 5.1cm (2in) inert 3. A temperature of 99C (210F) 4. An energy input of 58.6 kW 5. A pressure of 15psi A) 1,3,5 B) 1,2,3 C) 3,4,5 D) 1,3,4 E) 2,3,4

Answer 26

D) 1,3,4

Question 27

An internally fired boiler: A) Has the furnace surrounded by water B) Is less efficient than an externally fired unit C) Must be a watertube type D) Utilizes a high amount of refractory and/or firebrick E) Requires a setting

Answer 27

A) Has the furnace surrounded by water

Question 28

The first boiler to have an internal furnace was the: A) HRT boiler B) Package boiler C) Longitudinal drum firetube boiler D) Scotch Boiler E) Watertube boiler

Answer 28

D) Scotch Boiler

Question 29

The locomotive boiler type is a: A) Three pass internal furnace B) Single pass external furnace C) Single pass internal furnace D) Wetback boiler E) Three pass external furnace

Answer 29

C) Single pass internal furnace

Question 30

When comparing a watertube and firetube boiler, a firetube boiler: A) Is more difficult to maintain water level in when the load changes B) Has a quicker load response C) Is slower to respond to load changes D) Requires more fuel to respond to load changes E) Has less reserve steaming capacity

Answer 30

B) Has a quicker load response

Question 31

The HRT boiler is inefficient to operate due to: A) The labour required to construct the brickwork B) The gas passes were too few C) The gas passes were too long D) Heat loss through the brick setting was too high E) The coal fired grates

Answer 31

D) Heat loss through the brick setting was too high

Question 32

In the firetube boiler______ pass through the tubes. A) Hot air B) Fuel gas C) Hot gases D) Feedwater E) Fuel oil

Answer 32

C) Hot gases

Question 33

In general construction the Firebox boiler is not unlike _______ boiler. A) Watertube B) Scotch Marine C) Horizontal Return Tube D) Locomotive E) Firetube

Answer 33

D) Locomotive

Question 34

In the HRT boiler the hot combustion gases pass: A) Along the underside of the drum and return through the firetubes to the economizer B) Through the firetubes and return along the underside of the drum to the boiler grate C) Along the underside of the drum and return through the firetubes to the boiler stack D) Along the underside of the drum and return through the firetubes to the boiler grate E) Through the firetubes and return along the underside of the drum to the boiler stack

Answer 34

C) Along the underside of the drum and return through the firetubes to the boiler stack

Question 35

A major advantage of the locomotive boiler was the: A) Absence of brickwork, refractory or setting B) Use of longitudinal stays C) Size of the smoke box D) Internal furnace E) Use of a draft inducer

Answer 35

A) Absence of brickwork, refractory or stays

Question 36

As per applicable code the pressure and temperature limiting factors for steam and hot water heating boilers are: A) 1103kPa(160psi) for steam and 103kPa or 121C(14.7 or 250F) for hot water B) 100kPa(15psi) for steam and 120C or 1100kPa(250F or 160psi) for hot water C) 103kPa(15psi) for steam and 121C or 1100kPa (250F or 160psi) for hot water D) 1103 kPa or 121C (160psi or 250F) for steam and 1103kPa (160psi) for hot water E) 121kPa or 103C ( 17.5 or 217F) for steam and 1103kPa (160psi) for hot water

Answer 36

C) 103kPa (15psi) for steam and 121C or 1100kPa (250F or 160psi) for hot water

Question 37

The HRT boiler is classified as a _______ pass boiler. A) Four B) One C) Three D) Multi E) Two

Answer 37

E) Two

Question 38

At atmospheric conditions with the heat available 1 litre of water will produce _______ litres of steam. A) 1700 B) 500 C) 1500 D) 2000 E) 1000

Answer 38

A) 1700

Question 39

The vertical firetube boiler should be warmed up slowly in order to prevent overheating of the: A) Tubes and upper tube sheet B) Tubes and lower tube sheet C) Crown sheet and water legs D) Steam drum and mud drum E) Crown sheet and barrel

Answer 39

A) Tubes and upper tube sheet

Question 40

Vertical firetube boilers have an advantage when _______ is limited. A) Weight B) Height C) Floor space D) Pressure E) Temperature

Answer 40

C) Floor space