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 TB 600-1
17.
The type of valve that provides the most accurate control of flow is:
a.
Globe valve.
b.
Gate valve.
c.
Check valve.
d.
Needle valve.
a.
-109.3 .
F
b.
-322.78 .
F
c.
-297.3 .
F
d.
-308.7 .
F
19. The critical temperature of oxygen is:
a.
-181.84 .
F
b.
-297.3 .
F
c.
87.9 .
F
d.
-69.9 .
F
20. The expansion ratio of liquid oxygen is approximately:
a.
696.5 to 1.
b.
841.2 to 1.
c.
860.6 to 1.
d.
754.2 to 1.
21. The valve which drops the pressure and temperature of the entering air and produces the first liquid air in the
process is known as the:
a.
Nitrogen expansion valve.
b.
Oxygen expansion valve.
c.
Air expansion valve.
22. The separation of a liquid mixture by vaporizing one component, removing that vapor and condensing it as a
separate liquid is known as:
a.
Absorption.
b.
Distillation.
c.
Solidification.
d.
Filtration.
23. The purpose of a refrigeration system In liquid oxygen generating plants is to:
a.
Cool the crude oxygen mixture.
b.
Cool the nitrogen stream from the low pressure column.
c.
Aid in removal of heat from the incoming air.
d.
Provide cooling for the nitrogen subcooler.
24. During production operation, the absorbent bed within the air dryers and oxygen purifiers (hydro-carbon
absorbers) is periodically reactivated by a flow of:
a.
Heated nitrogen.
b.
Warm air.
c.
Clean fresh air.
d.
Carbon dioxide.
25. The valve used to control the liquid level In the high pressure column plus the pressure and rate of flow to the
low pressure column is known as:
a.
Low pressure column drain valve.
b.
Air expansion valve.
c.
High pressure column drain valve.
d.
Oxygen expansion valve.
C.
Answer the following questions briefly
26.
The most likely cause of an overheating air compressor is __________________________.
27.
What types of safety devices are used to prevent damage to lines and vessels in oxygen generating plants?
28.
What reference is used to determine type of lubricants to use and capacities of plant components?
29.
What are the functions of an expansion valve?
C-2
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