4th Class Power Engineering Unit A11:
Introduction to Boiler Designs
This type of boiler is more tolerant of Class 1 water treatment, because they are more
resistant to corrosion:
Select one:
a. coil type
b. fire tube
A
c. cast iron
d. water tube - ANS c
VI
One disadvantage of a firetube boiler is:
Select one:
TU
a. higher maintenance costs than watertube boilers
b. slow response to load changes
c. require very high quality feedwater
d. slow to bring up to operating pressure and temperature - ANS d
IS
Tubes used for high pressure boiler service are usually:
Select one:
OM
a. welded
b. rolled
c. seamless
d. beaded - ANS c
NA
In this type of sectional cast iron boiler, a single nipple connects two sections:
Select one:
a. horizontal
b. vertical
JP
c. atmospheric
d. resistance - ANS a
A disadvantage of watertube boilers in comparison to firetube boilers is:
Select one:
a. they have poorer water circulation
b. they require much higher quality feedwater
c. they cannot make superheated steam
d. they contain less water at the same steaming capacity - ANS b
,The two general types of electric boilers are the:
Select one:
a. electrode and immersion
b. generator and immersion
c. electrode and generator
d. electrode and relay - ANS a
In boiler design, even the weakest component of a boiler must be strong enough to
operate at the:
A
Select one:
a. MANP
VI
b. MASP
c. MAWP
d. MAXP - ANS c
TU
Flexible watertube heating boiler tubes are designed for:
Select one:
a. simple replacement
IS
b. maximum flow
c. minimum expansion
d. turbulent scrubbing - ANS a
OM
In the jet type electrode boiler, the _________ depends upon the amount of water
sprayed:
Select one:
a. circulation produced
NA
b. voltage produced
c. resistance produced
d. current produced - ANS d
Packaged watertube boilers are described by:
JP
Select one:
a. the shape that their tubes and drums form
b. the number of mud drums they employ
c. the area of floor space they occupy
d. the type of drums they employ - ANS a
This is the name given to the gaseous products of combustion entering the stack:
Select one:
, a. saturated gas
b. hot gas
c. stack gas
d. flue gas - ANS d
This type of boiler is assembled piece by piece on the work site:
Select one:
a. field-assembled
b. field-erected
c. packaged
A
d. auxiliary - ANS b
VI
A cylindrical pressure vessel component to which heads or matching components can
be attached:
Select one:
TU
a. downcomer
b. riser
c. flue
d. course - ANS d
IS
When speaking of boilers, HRT is the acronym for:
Select one:
OM
a. horizontal return tubular
b. horizontal riveted tubular
c. heated return tubular
d. heated riveted tubular - ANS a
NA
This type of steam generating unit employs a pump to maintain water/steam velocity in
the tubes:
Select one:
a. fluidized bed
b. radiant
JP
c. convection
d. supercritical - ANS d
An advantage of an electric boiler over a fuel fired boiler is:
Select one:
a. they contain more water at the same steaming capacity
b. they are less expensive to purchase
c. they are silent in operation
Introduction to Boiler Designs
This type of boiler is more tolerant of Class 1 water treatment, because they are more
resistant to corrosion:
Select one:
a. coil type
b. fire tube
A
c. cast iron
d. water tube - ANS c
VI
One disadvantage of a firetube boiler is:
Select one:
TU
a. higher maintenance costs than watertube boilers
b. slow response to load changes
c. require very high quality feedwater
d. slow to bring up to operating pressure and temperature - ANS d
IS
Tubes used for high pressure boiler service are usually:
Select one:
OM
a. welded
b. rolled
c. seamless
d. beaded - ANS c
NA
In this type of sectional cast iron boiler, a single nipple connects two sections:
Select one:
a. horizontal
b. vertical
JP
c. atmospheric
d. resistance - ANS a
A disadvantage of watertube boilers in comparison to firetube boilers is:
Select one:
a. they have poorer water circulation
b. they require much higher quality feedwater
c. they cannot make superheated steam
d. they contain less water at the same steaming capacity - ANS b
,The two general types of electric boilers are the:
Select one:
a. electrode and immersion
b. generator and immersion
c. electrode and generator
d. electrode and relay - ANS a
In boiler design, even the weakest component of a boiler must be strong enough to
operate at the:
A
Select one:
a. MANP
VI
b. MASP
c. MAWP
d. MAXP - ANS c
TU
Flexible watertube heating boiler tubes are designed for:
Select one:
a. simple replacement
IS
b. maximum flow
c. minimum expansion
d. turbulent scrubbing - ANS a
OM
In the jet type electrode boiler, the _________ depends upon the amount of water
sprayed:
Select one:
a. circulation produced
NA
b. voltage produced
c. resistance produced
d. current produced - ANS d
Packaged watertube boilers are described by:
JP
Select one:
a. the shape that their tubes and drums form
b. the number of mud drums they employ
c. the area of floor space they occupy
d. the type of drums they employ - ANS a
This is the name given to the gaseous products of combustion entering the stack:
Select one:
, a. saturated gas
b. hot gas
c. stack gas
d. flue gas - ANS d
This type of boiler is assembled piece by piece on the work site:
Select one:
a. field-assembled
b. field-erected
c. packaged
A
d. auxiliary - ANS b
VI
A cylindrical pressure vessel component to which heads or matching components can
be attached:
Select one:
TU
a. downcomer
b. riser
c. flue
d. course - ANS d
IS
When speaking of boilers, HRT is the acronym for:
Select one:
OM
a. horizontal return tubular
b. horizontal riveted tubular
c. heated return tubular
d. heated riveted tubular - ANS a
NA
This type of steam generating unit employs a pump to maintain water/steam velocity in
the tubes:
Select one:
a. fluidized bed
b. radiant
JP
c. convection
d. supercritical - ANS d
An advantage of an electric boiler over a fuel fired boiler is:
Select one:
a. they contain more water at the same steaming capacity
b. they are less expensive to purchase
c. they are silent in operation
