Development of Boiler Design

Question 1

A straight tube longitudinal drum boiler with a chain grate
stoker usually had
a) one pass
b) two passes
c) three passes
d) four passes
e) an internal furnace

Answer 1

c) three passes

Question 2

The Haycock boiler was

a) a watertube unit
b) of multiple flue gas pass design
c) used around 1720
d) of welded construction
e) a packaged unit

Answer 2

c) used around 1720

Question 3

A characteristic which made early boilers very inefficient
was
a) lack of heating surface
b) an excess of flat surfaces
c) the internal furnace
d) lack of good quality fuels
e) inadequate water treatment

Answer 3

a) lack of heating surface

Question 4

An early boiler having a longitudinal shell or drum had as
its heating surface
a) only the lower part of the shell
b) the lower part of the shell and the rear plate or head
c) the total shell side and one end plate or head
d) only the one end plate
e) two passes along the shell or drum

Answer 4

a) only the lower part of the shell

Question 5

Thermal flooding boilers

a) are often termed “Hot Water Boilers”
b) are low capacity units
c) are used to inject steam into geological formations
d) do not use water as the heat transfer medium
e) are used in the generation of electricity

Answer 5

c) are used to inject steam into geological formations

Question 6

The first boiler to have an internal furnace was the

a) HRT boiler
b) Scotch boiler
c) longitudinal drum firetube boiler
d) locomotive boiler
e) watertube boiler

Answer 6

b) Scotch boiler

Question 7

A _________________ is a water-filled section which
surrounds the firebox in locomotive boilers.
a) crown sheet
b) boiler drum
c) tell tale stay
d) steam dome
e) water leg

Answer 7

e) water leg

Question 8

The first boiler to have firetubes became known as the

a) Haycock boiler
b) Scotch boiler
c) Mushroom boiler
d) Haystack boiler
e) HRT boiler

Answer 8

e) HRT boiler

Question 9

The water leg was introduced with the

a) scotch boiler
b) longitudinal drum boiler
c) watertube boiler
d) locomotive boiler
e) HRT boiler

Answer 9

d) locomotive boiler

Question 10

Safety, efficient operation, and economical fuel consumption
are
a) main considerations when designing boilers
b) the main advantages of a watertube unit over a firetube
unit
c) the result of “packaged unit” construction
d) due to improved metals and alloys
e) the results of environmental protection laws

Answer 10

a) main considerations when designing boilers

Question 11

The steam space of a boiler must be large in order to

a) keep the steam pressure down
b) reduce the cooling effect of water
c) separate the water from the steam
d) accommodate all the steam riser tubes
e) accommodate a steam separator

Answer 11

c) separate the water from the steam

Question 12

Waterlegs generally

a) act as support for a boiler
b) surround a furnace
c) do not act as heating surface
d) do not require staying
e) never presented any waterside problems

Answer 12

b) surround a furnace

Question 13

All parts of the boiler exposed to fire or hot gases must be

a) made of firebrick
b) covered by water
c) air cooled
d) fitted with expansion joints
e) covered with ceramic tile

Answer 13

b) covered by water

Question 14

Boiler structural strength must
a) be at least ten times the normal working pressure rating
b) be at least equal to the various code requirements
c) take into account only pressure values and not consider
temperatures
d) be increased if thinner metal is to be used
e) be verified by the purchaser

Answer 14

b) be at least equal to the various code requirements

Question 15

A steam boiler should be compact in design in order to

a) reduce building costs
b) be easier to move
c) weigh less
d) be easier to maintain
e) reduce operating costs

Answer 15

a) reduce building costs