10-10.
Once the plant is in operation, which of
the following problems is most likely to
cause priming?
1.
A sudden rising of the water level
2.
A water level that is too high
3.
Both 1 and 2 above
4.
A sudden drop in the water level
10-11.
The vacuum gage readings are nearly
identical for the first and second
effects. What is the most likely cause?
1.
Air leaks between the first and
second effects
2.
Equally low water levels in both
effects
3.
Equally high water levels in both
effects
4.
Obstructions in the flow between the
first and second effects
10-12.
You have an air leak and your
watchstander has been operating the air
ejectors improperly.
These conditions
can be expected to produce which of the
following vacuum readings in the last
effect shell?
10-13.
10-14.
1.
34 in. of mercury
2.
30 in. of mercury
3.
26 in.
of mercury
4.
10 in.
of mercury
When the plant is in operation, which of
the following vacuum tests may be made
on joints?
1.
Air pressure
2.
Candleflame
3.
Soapsuds
4.
Hydrostatic
A hydrostatic leak test on a
nonremovable tube bundle is conducted at
(a) what pressure, and (b) on what side
of the unit?
1.
(a) 50 psi, (b) the tube side
2.
(a) 50 psi, (b) the shell side
3.
(a) 30 psi, (b) the tube side
4.
(a) 30 psi, (b) the shell side
10-16.
10-17.
Air ejector nozzles should be cleaned
with a thin rattail file.
A damaged strainer or nozzle should be
replaced with a new one.
10-18.
The temperature of circulating water
rises more than 20°F as it passes
through the distiller condenser.
What
should you do first?
1.
Clean the air ejectors
2.
Inspect the condenser circulating
water systems
3.
Check for improper operating
procedures
4.
Reset the back pressure-regulating
valve
10-19.
Which of the following indicators
suggests improper drainage of the'
distiller condenser?
10-20.
1.
The flash chamber gage glass is
flooded
2.
The first-effect tube nest vacuum is
several inches of mercury
3.
The plant does not produce designed
output when the orifice is 5 psig
4.
All of the above
On older plants, brine density is
adjusted by what control(s)?
1.
The evaporator heat control valve
2.
The hand-controlled valve located in
the discharge line of the brine
overboard pump
3.
The wire control valve
4.
The first-effect feed valve
10-21.
A salinometer measures the degree of
salinity in a sample of brine taken from
what source?
1.
The discharge side of the brine pump
2.
The intake side of the brine pump
3.
The first-effect feed valve
4.
The second-effect feed valve
Questions 10-22 through 10-29 refer to
flash-type distilling plants.
Use the following situation to answer
10-22.
What is the maximum design feedwater
questions 10-15 through 10-17 as True or
temperature?
False: A low vacuum reading indicates a problem
with the air ejector.
1.
75°F
2.
85°F
10-15.
If you believe the problem is low steam
3.
165°F
pressure, you should try to overcome the
4.
175°F
problem by removing and cleaning the
nozzle.
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