Power Engineering 3B1 Chapter 1 quiz 1
questions and answers
Packaged watertube boilers capacities range from?
a. 2300 kg to 65000 kg per hour
b. 500 kg to 100 mg per hour
c. 15 psi to 15000 kg per hour
d. 65000 to 100000 kg per hour - ANS a
A
The main advantage of the packaged boiler is its _____ _____.
VI
a. small size
b. compact design
c. low cost
TU
d. quality steam - ANS c
Field erected boilers have outputs of?
a. 75000 kg/h
IS
b. 100000 kg/h
c. 100 mg/h
d. 150000 kg/h or more - ANS d
OM
One square meter of heating surface equals 10 kilowatts. The heating surface of a
boiler must be determined by computing the area of the surface involved in square
metres and where a computation is to be made of a curved surface; the surface having
the greater radius shall be taken.
NA
a. True
b. False - ANS a
Where electric power is used as the heating source, the boiler rating shall be the
JP
maximum kilowatt rating of the ______ ______.
a. Power Plant
b. Heating element
c. Boiler wiring
d. MCC - ANS b
Where the boiler provides the entire steam supply to an electric generating unit, the
output of the boiler is expressed in terms of power output of the generator (for example
a 300 megawatt boiler).
, a. True
b. False - ANS a
The downcomers are located in the ______ regions of the boiler, or external to the
furnace altogether. The risers are located in the ________ zones of the boiler, being
exposed to radiant heat of the furnace or to the very hot flue gases near the furnace.
a. back, front
b. cooler, hottest
c. water, furnace
d. drum, radiant - ANS b
A
Most downcomers run horizontally between the steam drum and the mud drum. a. True
VI
b. False - ANS b
The steam separating equipment separates the _______ from the steam/water mixture.
TU
a. water
b. steam
c. impurities
d. water droplets - ANS b
IS
There are several factors that influence the natural circulation in a watertube boiler.
These are:
OM
a. The height of the steam drum above the bottom drum or header.
b. The amount of heat applied to the tube. The hotter the tube becomes, the more
steam bubbles are formed, creating more mass differential and thus more
circulation.
c. The operating pressure of the boiler. As boiler pressures increase, the density of
NA
the steam increases
d. The cleanliness of the tubes can also affect circulation.
e. All of the above - ANS e
The purpose of the downcomer is to supply:
JP
a. Hot water to the steam drum
b. Cool water to the steam drum
c. Cool water from steam drum to rest of boiler
d. Steam to steam drum
e. boiler feed water to the boiler - ANS c
These types of boilers (A, D, and O) have furnaces cooled by _________ lining the
furnace walls.
questions and answers
Packaged watertube boilers capacities range from?
a. 2300 kg to 65000 kg per hour
b. 500 kg to 100 mg per hour
c. 15 psi to 15000 kg per hour
d. 65000 to 100000 kg per hour - ANS a
A
The main advantage of the packaged boiler is its _____ _____.
VI
a. small size
b. compact design
c. low cost
TU
d. quality steam - ANS c
Field erected boilers have outputs of?
a. 75000 kg/h
IS
b. 100000 kg/h
c. 100 mg/h
d. 150000 kg/h or more - ANS d
OM
One square meter of heating surface equals 10 kilowatts. The heating surface of a
boiler must be determined by computing the area of the surface involved in square
metres and where a computation is to be made of a curved surface; the surface having
the greater radius shall be taken.
NA
a. True
b. False - ANS a
Where electric power is used as the heating source, the boiler rating shall be the
JP
maximum kilowatt rating of the ______ ______.
a. Power Plant
b. Heating element
c. Boiler wiring
d. MCC - ANS b
Where the boiler provides the entire steam supply to an electric generating unit, the
output of the boiler is expressed in terms of power output of the generator (for example
a 300 megawatt boiler).
, a. True
b. False - ANS a
The downcomers are located in the ______ regions of the boiler, or external to the
furnace altogether. The risers are located in the ________ zones of the boiler, being
exposed to radiant heat of the furnace or to the very hot flue gases near the furnace.
a. back, front
b. cooler, hottest
c. water, furnace
d. drum, radiant - ANS b
A
Most downcomers run horizontally between the steam drum and the mud drum. a. True
VI
b. False - ANS b
The steam separating equipment separates the _______ from the steam/water mixture.
TU
a. water
b. steam
c. impurities
d. water droplets - ANS b
IS
There are several factors that influence the natural circulation in a watertube boiler.
These are:
OM
a. The height of the steam drum above the bottom drum or header.
b. The amount of heat applied to the tube. The hotter the tube becomes, the more
steam bubbles are formed, creating more mass differential and thus more
circulation.
c. The operating pressure of the boiler. As boiler pressures increase, the density of
NA
the steam increases
d. The cleanliness of the tubes can also affect circulation.
e. All of the above - ANS e
The purpose of the downcomer is to supply:
JP
a. Hot water to the steam drum
b. Cool water to the steam drum
c. Cool water from steam drum to rest of boiler
d. Steam to steam drum
e. boiler feed water to the boiler - ANS c
These types of boilers (A, D, and O) have furnaces cooled by _________ lining the
furnace walls.
