ABSA 4A UNIT 12 Questions with CORRECT Answers
(Grade A+)
Question 1:
Boiler chimneys are commonly lined with: Select one: a. Concrete b. Rubber c. Fire brick d. Insulation
Answer:
c. Fire brick
Question 2:
The inert bed material of a fluidized bed boiler must be heated to about __________ °C if burning coal.
Select one: a. 300 - 350 b. 450 - 500 c. 500 - 700 d. 800 - 900
Answer:
d. 800 - 900
Question 3:
Carbon that is not combined with hydrogen is referred to as: Select one: a. Mono-carbon b. Separated
carbon c. Free carbon d. Fixed carbon
Answer:
d. Fixed carbon
Question 4:
The typical time required to heat a fluidized bed to ignition temperature prior to the introduction of coal
is: Select one: a. One hour b. 30 minutes
Answer:
a. One hour c. Two hours d. Three hours
Question 5:
An induced draft fan handles: Select one: a. Air from the combustion chamber b. Air going to the
combustion chamber c. Flue gases going to the combustion chamber d. Flue gases from the combustion
chamber
Answer:
d. Flue gases from the combustion chamber
, Question 6:
Combustion of fuel in a boiler furnace: Select one: a. Requires a higher air-fuel ratio than a diesel
engine b. Should occur with a minimum of excess air c. Is perfect when the stack gases are free of
moisture d. Requires mechanical draft
Answer:
b. Should occur with a minimum of excess air
Question 7:
A draft system with a FD and ID fan is ___________ Select one: a. Forced b. Balanced c. Induced d.
Hybrid
Answer:
b. Balanced
Question 8:
Retractable soot blowers are installed in a boiler's radiant heat transfer area including the. Select one: a.
Economizer b. Secondary air heater
Answer:
d. Reheater c. Air preheater d. Reheater
Question 9:
In addition to reducing heat transfer, soot and ash on fireside tubes also: Select one: a. Lessen the
chance of furnace explosions b. Increase power requirements of the draft fan c. Prevent fireside
corrosion d. Raise superheater temperatures
Answer:
b. Increase power requirements of the draft fan
Question 10:
A sudden drop in steam pressure causes Select one: a. a sudden increase in drum level b. a rapid
collapse of steam bubbles in the boiler c. "shrinkage" d. a single element feedwater control to
immediately add water to the drum
Answer:
a. a sudden increase in drum level
(Grade A+)
Question 1:
Boiler chimneys are commonly lined with: Select one: a. Concrete b. Rubber c. Fire brick d. Insulation
Answer:
c. Fire brick
Question 2:
The inert bed material of a fluidized bed boiler must be heated to about __________ °C if burning coal.
Select one: a. 300 - 350 b. 450 - 500 c. 500 - 700 d. 800 - 900
Answer:
d. 800 - 900
Question 3:
Carbon that is not combined with hydrogen is referred to as: Select one: a. Mono-carbon b. Separated
carbon c. Free carbon d. Fixed carbon
Answer:
d. Fixed carbon
Question 4:
The typical time required to heat a fluidized bed to ignition temperature prior to the introduction of coal
is: Select one: a. One hour b. 30 minutes
Answer:
a. One hour c. Two hours d. Three hours
Question 5:
An induced draft fan handles: Select one: a. Air from the combustion chamber b. Air going to the
combustion chamber c. Flue gases going to the combustion chamber d. Flue gases from the combustion
chamber
Answer:
d. Flue gases from the combustion chamber
, Question 6:
Combustion of fuel in a boiler furnace: Select one: a. Requires a higher air-fuel ratio than a diesel
engine b. Should occur with a minimum of excess air c. Is perfect when the stack gases are free of
moisture d. Requires mechanical draft
Answer:
b. Should occur with a minimum of excess air
Question 7:
A draft system with a FD and ID fan is ___________ Select one: a. Forced b. Balanced c. Induced d.
Hybrid
Answer:
b. Balanced
Question 8:
Retractable soot blowers are installed in a boiler's radiant heat transfer area including the. Select one: a.
Economizer b. Secondary air heater
Answer:
d. Reheater c. Air preheater d. Reheater
Question 9:
In addition to reducing heat transfer, soot and ash on fireside tubes also: Select one: a. Lessen the
chance of furnace explosions b. Increase power requirements of the draft fan c. Prevent fireside
corrosion d. Raise superheater temperatures
Answer:
b. Increase power requirements of the draft fan
Question 10:
A sudden drop in steam pressure causes Select one: a. a sudden increase in drum level b. a rapid
collapse of steam bubbles in the boiler c. "shrinkage" d. a single element feedwater control to
immediately add water to the drum
Answer:
a. a sudden increase in drum level
