10-23.
During operation of the plant, a
10-29.
The relief valve in the feedwater inlet
pressure reduction occurs in each stage
is set to open at what pressure?
to enable the plant to
1.
71 psig
1.
function with a steady, even flow of
2.
73 psig
feedwater throughout the plant
3.
75 psig
2.
produce as much vapor in the fifth
4.
77 psig
stage as in the first
3.
control the feedwater temperature
Questions 10-30 through 10-34 concern
within the specified limits
the maintenance of a flash-type unit,
4.
produce an increased amount of vapor
and should be judged True or False.
in each successive stage
10-30.
Air leakage in the brine and distillate
10-24.
Distillate leaving the cooler is pumped
pumps will have NO effect on vacuum.
to storage tanks only if the salinity
reading is NO greater than
10-31.
The saltwater heater requires more
frequent cleaning than the distillate
1.
0.045 epm
cooler.
2.
0.055 epm
3.
0.065 epm
10-32.
The orifices in the feed boxes are more
4.
0.075 epm
likely to be plugged by foreign matter
than by scale.
10-25.
The four thermometers mounted on the
saltwater heater measure which of the
10-33.
A relief valve that is continually
following temperatures?
popping should be scheduled for routine
maintenance as time permits.
1.
Feedwater inlet and outlet
2.
Steam surrounding the tubes
10-34.
Pneumatic-type reducing valves should be
3.
Desuperheating temperature
used only for low-pressure applications.
4.
All of the above
10-26.
Cooling water from the air ejector
precooler flows into which of the five
heat exchangers mounted on the
evaporator?
1.
Second
2.
Third
3.
Fourth
4.
Fifth
10-27.
10-28.
How many inches of mercury are
in stage 5 of the evaporator?
1.
24 in.
2.
26 in.
3.
28 in.
4.
30 in.
What is the
strainer?
required
purpose of the duplex
1.
To clean steam going to the
preheater air ejector
2.
To remove solid matter from seawater
3.
To remove impurities from freshwater
4.
To remove noncondensables from the
saltwater heater
Learning Objective:
Specify
maintenance and adjustments
required on relief and reducing
valves, and recognize some of the
troubles that may be encountered
with each.
10-35.
Which of the following procedures must
always be followed after a relief valve
is removed?
1.
Reset the spring tension
2.
Reduce the pressure
3.
Grind the disk
4.
Grind the seat
10-36.
A pneumatic pressure-controlled reducing
valve may be used on which of the
following supply lines?
1.
Galley steam
2.
Fuel oil
3.
Freshwater
4.
Each of the above
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