Auxiliary Machinery (continued)
Textbook Assignment: Engineman 1&C, NAVEDTRA 10543-E1, pages 7-22 through 8-21
Learning Objective: point out the
operational, troubleshooting, and
repairing techniques for the
submerged tube and the flash-type
Which of the following ships have vapor
compression distilling units?
Questions 10-2 through 10-21 refer to
low-pressure submerged tube distilling
Varied operating conditions are a primary
cause of which of the following problems?
Changes in feed levels
Scaling of evaporator tubes
Improper liquid level in the first
Higher steam pressures
You need to adjust three controls in
order to bring heat and fluid condition
You should use which of
the following techniques?
Adjust all three controls
Adjust all three controls singly and
Adjust each control singly and in
Adjust each control at lo-minute
Which of the following factors is/are
most likely to cause a decrease in the
Air leaks in the first tube nest
Low volume in the last-effect shell
Dirty circulating water strainer
All of the above
Steam orifices should be inspected how
With each overhaul
Water used to desuperheat live steam
should be taken from what source?
The first-effect tube nest drain pump
The second-effect tube nest drain
The freshwater supply
The steam feed system
Fluctuations in the first-effect steam
pressure and temperature cause similar
fluctuations in which of the following
parts of the plant?
The second effect only
The steam supply line only
The water levels only
The entire plant
Tubes in the first-effect tube nest
should be cleaned whenever the mercury
drops below which of the following
1 1/2 in.
2 1/2 in.
When you can NOT feed water into the
first effect, you should look for which
of the following causes?
Scale deposits in the air ejector
Scale deposits in the vapor
Obstructions in the feed line
All of the above