3-10. In reference to the water drum, which
of the following statements is
accurate?
1. The water drum is the same size as
the header
2. The water drum is larger than the
steam drum
3. The water drum is smaller than the
header
4. The water drum is larger than the
header
3-11. Downcomers range in diameter from 3
inches to
1. 9 inches
2. 8 inches
3. 6 inches
4. 4 inches
3-12. Generating tubes are made of what type
of metal?
1. Steel
2. Copper
3. Brass
4. Tin
3-13. The surface blow pipe is used for
which of the following purposes?
1. To remove suspended solid matter
that floats on top of the water
2. To lower the steam drum water level
3. To blow water out to lower the
chemical level in the boiler when
it becomes too high
4. All of the above
3-14. How many people are required during
boiler light off?
1. One
2. Two
3. Three
4. Four
3-l5. In reference to boiler design
pressure, which of the following
statements is accurate?
1. Design pressure is the same as
operating pressure
2. Design pressure is lower than
operating pressure
3. Design pressure iS not given in
the manufacturer’s technical
manual for a particular boiler
4. Design pressure is the maximum
pressure specified by the boiler
manufacturer as a criterion for
boiler design
3-16. Why are single-furnace boilers often
referred to as D-type boilers?
1. They are manufactured by the Delta
Manufacturing Company
2. The tubes form a shape that looks
like the letter D
3. The steam and water always flow
down
4. The D indicates a double boiler-
wall thickness
3-17. In naval propulsion plants, where are
the burners usually located?
1. At the front of the boiler
2. At the back of the boiler
3. On the right side of the boiler
4. On the left side of the boiler
3-18. On almost all boilers used in the
propulsion plants of naval ships,
what protects the superheater tubes
from radiant heat?
1. Water screen baffles
2. Insulating block
3. Air tubes
4. Water screen tubes
3-1. What is the approximate operating
pressure range for header-type
boilers?
1. 300 to 425 psi
2. 435 to 700 pal
3. 700 to 825 pal
4. 825 to 925 psi
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