4-37.
Once the distilling plant is in
operation, which of the following
problems is/are likely to cause
priming?
1.
A sudden rise 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
4-38.
The vacuum gauge readings are
nearly identical on the first- and
second-effect shells of a
distilling plant. What is the most
likely cause?
1.
Air leaks between the first and
second effect
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
4-39.
Improper venting of evaporator tube
nests can cause which of the
following problems?
1.
Condensation of steam in the
vapor feed heater
2.
Accumulation of air in the
tubes
3. Excessive increase of tube nest
steam to the distilling
condenser
4.
Excessive increase of scale
deposits on the evaporator tube
nest
4-40.
How much scale preventive compound
is needed for each 4,000 gallons
per day of distilling plant
capacity?
1.
1.0 pint
2.
2.0 pints
3.
3.0 pints
4.
1.5 pints
4-41.
You have an air leak in the
distilling plant last-effect shell
and the watch stander has been
operating the air ejectors
improperly.
These conditions can
produce which of the following
vacuum readings in the last-effect
shell?
1.
34 in.Hg
2.
30 in.Hg
3.
26 in.Hg
4.
10 in.Hg
4-42.
When a distilling plant is in
operation, which of the following
vacuum tests should you use on
joints?
1.
Candle flame
2.
Air pressure
3. Soapsuds
4.
Hydrostatic
4-43.
You must clean air ejector nozzles
with which of the following tools?
1.
Special reamer
2. Rat-tail file
3.
Sharp scraper
4. Metal hole brush
4-44.
The temperature of circulating
water has exceeded the allowable
20°F as it passes through the
distiller condenser. You know that
this situation is not normal.
What
action should you take 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
30