Chapter 4 Firetube Boilers (Heating & Power)

Question 1

The maximum pressure for a 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

103 kPa (14.7 psi.)

Question 2

The main part of a high-pressure firetube boiler is called the

a) windbox
b) furnace
c) shell
d) drum

Answer 2

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 103 C (17.5 psi or 217 F) for steam units and 1100 kPa (160 psi) for hot water units
b) 1100 kPa (160 psi) for steam units and 103 kPa or 121 C (14.7 psi or 250 F) for hot water units
c) 103 kPa (14.7 psi) for steam units and 121 C or 1100 kPa (250 F or 160 psi) for hot water units.
d) 1100 kPa or 121 C (160 psi or 250 F) for steam units and 1100 kPa for hot water units

Answer 3

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

Question 4

In a vertical firetube boiler, the steam space is located

a) in a separate 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

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

internally fired Scotch Marine boiler

Question 6

The chief advantage of a packaged heating boiler is

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

Name “ A firetube boiler that has brickwork or insulated metal at the rear reversing chamber to redirect the flue gases.”

a) Curly Back Corrosion Boiler
b) Dry-Back Boiler
c) Packaged Boiler
d) Wet-Back Boiler

Answer 11

b) Dry-Back Boiler

Question 12

Name “A firetube boiler that has a water-filled section surrounding the flue gas reversing chamber”.

a) Curly Back Corrosion Boiler
b) Dry-Back Boiler
c) Packaged Boiler
d) Wet-Back Boiler

Answer 12

d) Wet-Back Boiler

Question 13

Name “ A boiler supplied by the manufacturer completely assembled and equipped, including controls and mounted on its own base.”

a) Curly Back Corrosion Boiler
b) Dry-Back Boiler
c) Packaged Boiler
d) Wet-Back Boiler

Answer 13

c) Packaged Boiler

Question 14

Which type of boiler can exceed 103 kPa pressure?

a) Power Boilers
b) Heating Boilers

Answer 14

a) Power Boilers