ABSA 4A UNIT 11 questions with accurate answers
A _____________is a basic steam separator attached to the steam outlet
within the steam drum.
a. Centrifugal separator
b. Wet pipe
c. Dry pipe
d. Cyclone separator Ans✓✓✓ c. Dry pipe
A cyclone separator in a boiler steam drum:
Select one:
a. Removes moisture from steam, using centrifugal force
b. Causes impurities to be thrown from the boiler water
c. Is located at the superheater outlet
d. Discharges water into the scrubbers Ans✓✓✓ a. Removes moisture
from steam, using centrifugal force
A disadvantage of an electric boiler is that it:
Select one:
a. Requires alternating current
b. Has no chimney
,c. Is inefficient
d. Is very expensive to operate Ans✓✓✓ d. Is very expensive to operate
A firetube boiler is one that has:
Select one:
a. Water on the inside of the tubes and hot gas on the outside
b. The furnace as the first pass of the burner flame
c. Water on the outside of the tubes and hot water on the inside of the
tubes
d. Water on the outside of the tubes and hot gas on the inside of the
tubes Ans✓✓✓ d. Water on the outside of the tubes and hot gas on the
inside of the tubes
A hot water boiler is considered a high temperature water boiler when:
Select one:
a. its design pressure is less than 1100 kPa
b. its operating temperature is greater than 120°C
c. its operating temperature is less than 120°C
d. its energy input exceeds 58.7 kW Ans✓✓✓ b. its operating
temperature is greater than 120°C
A membrane water wall:
, Select one:
a. Consists of a metal sheeting in front of the tubes
b. Has metal plates welded between the tubes
c. Has firebrick in front of the tubes
d. Has waterproof membranes lining the tubes Ans✓✓✓ b. Has metal
plates welded between the tubes
A reason for preferring copper tubing over steel or cast iron in a tubular
boiler is:
Select one:
a. Greater heat transfer rate
b. Because of its good ductility
c. Its ability to withstand high temperature
d. Its lower cost than steel Ans✓✓✓ a. Greater heat transfer rate
A tube expander is used to:
Select one:
a. Break loose scale inside the tube
b. Break loose scale outside the tube
c. Expand and flare the tube
d. Bead the tube Ans✓✓✓ c. Expand and flare the tube
A _____________is a basic steam separator attached to the steam outlet
within the steam drum.
a. Centrifugal separator
b. Wet pipe
c. Dry pipe
d. Cyclone separator Ans✓✓✓ c. Dry pipe
A cyclone separator in a boiler steam drum:
Select one:
a. Removes moisture from steam, using centrifugal force
b. Causes impurities to be thrown from the boiler water
c. Is located at the superheater outlet
d. Discharges water into the scrubbers Ans✓✓✓ a. Removes moisture
from steam, using centrifugal force
A disadvantage of an electric boiler is that it:
Select one:
a. Requires alternating current
b. Has no chimney
,c. Is inefficient
d. Is very expensive to operate Ans✓✓✓ d. Is very expensive to operate
A firetube boiler is one that has:
Select one:
a. Water on the inside of the tubes and hot gas on the outside
b. The furnace as the first pass of the burner flame
c. Water on the outside of the tubes and hot water on the inside of the
tubes
d. Water on the outside of the tubes and hot gas on the inside of the
tubes Ans✓✓✓ d. Water on the outside of the tubes and hot gas on the
inside of the tubes
A hot water boiler is considered a high temperature water boiler when:
Select one:
a. its design pressure is less than 1100 kPa
b. its operating temperature is greater than 120°C
c. its operating temperature is less than 120°C
d. its energy input exceeds 58.7 kW Ans✓✓✓ b. its operating
temperature is greater than 120°C
A membrane water wall:
, Select one:
a. Consists of a metal sheeting in front of the tubes
b. Has metal plates welded between the tubes
c. Has firebrick in front of the tubes
d. Has waterproof membranes lining the tubes Ans✓✓✓ b. Has metal
plates welded between the tubes
A reason for preferring copper tubing over steel or cast iron in a tubular
boiler is:
Select one:
a. Greater heat transfer rate
b. Because of its good ductility
c. Its ability to withstand high temperature
d. Its lower cost than steel Ans✓✓✓ a. Greater heat transfer rate
A tube expander is used to:
Select one:
a. Break loose scale inside the tube
b. Break loose scale outside the tube
c. Expand and flare the tube
d. Bead the tube Ans✓✓✓ c. Expand and flare the tube
