ABSA 3B1 Practice Exam Questions and Answers Verified Solutions
Latest Update
Question: CHAPTER 1 - Number of questions on exam - 7 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.
Answer:
Chapter 1 a. 2300 kg to 65000 kg per hour
Question: 65000 To 100000 kg per hour The main advantage of the packaged boiler is its _____ _. a.
small size b. compact design c. low cost d. quality steam Field erected boilers have outputs of? a.
75000 kg/h b. 100000 kg/h c. 100 mg/h d. 150000 kg/h or more
Answer:
C. low cost d. 150000 kg/h or more
Question: One square metre 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. a.
True b. False Where electric power is used as the heating source, the boiler rating shall be the
maximum kilowatt rating of the _______ _. a. power plant b. heating element c. boiler wiring d. MCC
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 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 Most downcomers run horizontally between the steam drum and the mud drum. a.
True b. False The steam separating equipment separates the ____ from the steam/water mixture. a.
water b. steam c. impurities d. water droplets
Answer:
A. True b. heating element a. True b. cooler, hottest b. False b. steam
, Question: There are several factors that influence the natural circulation in a watertube boiler. These
are: 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 the steam increases d. The cleanliness of the tubes can also affect circulation. e.
All of the above The purpose of the downcomer is to supply: 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 These types of boilers (A, D, and O) have furnaces cooled by _ ____
lining the furnace walls. a. watertubes b. fans c. desuperheaters d. air circulation In the A, D & O type
boiler steam bubbles form in the hottest tubes and rise to the steam drum, where the steam is separated
out of the water and steam mixture. Circulation is maintained by water returning to the mud drum
through the cooler tubes. The hotter tubes, risers, are the ones in the radiant area of the furnace and the
hottest areas of the generating bank of tubes. a. True b. False
Answer:
E. All of the above d. Steam to steam drum a. watertubes a. True
Latest Update
Question: CHAPTER 1 - Number of questions on exam - 7 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.
Answer:
Chapter 1 a. 2300 kg to 65000 kg per hour
Question: 65000 To 100000 kg per hour The main advantage of the packaged boiler is its _____ _. a.
small size b. compact design c. low cost d. quality steam Field erected boilers have outputs of? a.
75000 kg/h b. 100000 kg/h c. 100 mg/h d. 150000 kg/h or more
Answer:
C. low cost d. 150000 kg/h or more
Question: One square metre 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. a.
True b. False Where electric power is used as the heating source, the boiler rating shall be the
maximum kilowatt rating of the _______ _. a. power plant b. heating element c. boiler wiring d. MCC
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 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 Most downcomers run horizontally between the steam drum and the mud drum. a.
True b. False The steam separating equipment separates the ____ from the steam/water mixture. a.
water b. steam c. impurities d. water droplets
Answer:
A. True b. heating element a. True b. cooler, hottest b. False b. steam
, Question: There are several factors that influence the natural circulation in a watertube boiler. These
are: 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 the steam increases d. The cleanliness of the tubes can also affect circulation. e.
All of the above The purpose of the downcomer is to supply: 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 These types of boilers (A, D, and O) have furnaces cooled by _ ____
lining the furnace walls. a. watertubes b. fans c. desuperheaters d. air circulation In the A, D & O type
boiler steam bubbles form in the hottest tubes and rise to the steam drum, where the steam is separated
out of the water and steam mixture. Circulation is maintained by water returning to the mud drum
through the cooler tubes. The hotter tubes, risers, are the ones in the radiant area of the furnace and the
hottest areas of the generating bank of tubes. a. True b. False
Answer:
E. All of the above d. Steam to steam drum a. watertubes a. True
