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7-18. Acetylene, which is inherently
unstable, may explode when subjected
to which of the following conditions?
1. Moderate weather
2. Contact with chlorine, copper,
silver, or mercury
3. Storage in a cylinder in the
horizontal position
4. Extreme cold
7-19. Which of the following substances
should be used to test for leaks from
an acetylene cylinder?
1. Grease
2. Alcohol
3. Soapy water
4. Distilled water
7-20. For what reason are acetylene
cylinders stored in an upright
postition with the valve end up?
1. To prevent acetone from flowing
into the valve
2. To assure that the acetone will
remain in the valve
3. To prevent the buildup of static
electricity
4. To protect them from sparks and
lightning
7-21. Oxygen and chlorine gases because they
can burn without air and strongly
support combustion should be stored in
which of the following locations?
1. On the weather deck
2. In a separate watertight storeroom
that has at least one compartment
between it and any space used to
store combustibles
3. Both 1 and 2 above
4. In a separate storeroom that has a
sprinkler system and is in an
out-of-the-way location that can be
easily isolated
7-22. Nonflammable gases such as helium,
nitrogen, carbon dioxide, and argon
may be stored in which of the
following locations?
1. Below deck in watertight
storerooms
2. On the weather deck along with
flammable or oxidizing gases
3. In any space aboard ship that is
sufficiently enclosed to prevent
ventilation
4. In any passageway inside the skin
of the ship
7-23. Which of the following
characteristics may be attributed to
aerosol products?
1. Aerosol cylinders will burst if
exposed to heat sources in excess
of 120°F
2. Aerosol cylinders are prone to
leakage if subjected to impact,
and propellants used are extremely
flammable
3. Aerosol contents, in sufficient
concentrations, can be anesthetic
or asphyxiating
4. All of the above
7-24. What is the flash point of (a)
flammable liquids and (b) combustible
liquids, greases, and pastes?
1. (a) 100°F or below;
below
2. (a) Above 100°F; (b)
3. (a) 200°F or below;
below
4. (a) Above 200°F; (b)
7-25. Which of the following
(b) 200°F or
above 200°F
(b) 100°F or
above 200°F
materials may
be stored in racks on the weather
deck?
1. Drums of paint and thinners
2. Drums of alcohol, acetone, and
ether
3. Drums of chemicals
4. Drummed petroleum products as per
Naval Ships’ Technical Manual,
chapter 670
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