QUALIFYING PROCEDURES FOR OPERATORS OF
OXYGEN-NITROGEN GENERATING PLANTS
Personnel selected for testing should have credit for high school chemistry or physics, or have a standard score of
45 or higher on GED test 3, high school level. They should also have normal color perception, good hearing ability and a
standard score of 95 or higher in aptitude area GM of the Army Classification Battery.
The purpose of this test is to determine if the personnel selected for licensing have sufficient technical knowledge
to recognize malfunctions of the generating plant.
This test consists of 50 true or false, multiple choice and essay type questions and represents 40 percent of the
testing procedures. Each question has a weight of two (2) points. Passing grade is 85 percent. Personnel failing this
test will not be permitted to proceed to the performance test. Such failure will disqualify the student for licensing until he
has completed a retraining period on the technical aspects of the equipment.
TEST QUESTIONS FOR OXYGEN-NITROGEN
Answer these questions by "True" or "False"
The two major components of air are oxygen and nitrogen.
Air is composed of approximately 68 percent nitrogen.
Oxygen has a boiling point of -302 6 .
The mixture of oxygen In the air is 21 percent.
The chief impurity found In liquid oxygen is Xenon.
The temperature of vapor cannot be liquefied, regardless of the pressure applied to it, is known as the critical
Liquid oxygen spilled on the flesh will produce an effect similar to a burn.
The fire hazard associated with liquid oxygen Is not the burning of the oxygen, but rather the ability of the
oxygen to support combustion.
In fighting fires involving liquid oxygen, one advantage of using water is flushing the area to remove the liquid
10. When locating the generating plant at the site of operation, the prevailing winds should be taken into
11. After starting a diesel engine or air compressor, the load should be applied immediately.
12. The air dryers in the generating plant are used to remove any acetylene from the air stream.
13. In heat exchange, heat will always flow from the body with the lower temperature and to the body with the
14. The component used in the refrigeration system to remove heat collected during the refrigerant cycle is
known as the evaporator.
15. The function of the oxygen sub-cooler in the generating plant is to lower the temperature of the crude liquid
oxygen prior to entering the low pressure column.
The next ten questions are multiple-choice type
It is extremely important that the air separation unit be perfectly level to assure proper function of the: