Handling of Hydrocarbon Fluids

Question 1

Fuel/air mixtures outside of the flammable range

a) can ignite spontaneously
b) cannot burn or explode
c) may explode but not burn
d) must have a source of ignition to burn
e) will burn only when above the flammable limit

Answer 1

b) cannot burn or explode

Question 2

If the fuel amount is below the lower flammable limit, the
mixture
a) is said to be lean
b) is explosive
c) can be called rich
d) must have a source of ignition
e) will not burn rapidly

Answer 2

a) is said to be lean

Question 3

In order for hydrocarbons to burn, the
a) mixture must be lean
b) air/fuel mixture should be above the upper flammable
limit
c) fuel/air mixture must be rich
d) fuel must be vaporised
e) temperature must be below the boiling temperature

Answer 3

d) fuel must be vaporised

Question 4

Iron and hydrogen sulphide will react to form

a) a non-combustible substance
b) a very high ignition temperature substance
c) pyrophoric iron sulphide
d) a very narrow flammable limit range substance
e) hydroferric acid

Answer 4

c) pyrophoric iron sulphide

Question 5

The flash point of a liquid is the temperature at which

a) all molecular vibration will cease
b) it will form a gas and burn
c) spontaneous combustion will occur
d) the liquid will burn
e) the vapours become inert

Answer 5

b) it will form a gas and burn

Question 6

A flammable limit of a fuel/air mixture is

a) no indication of its combustion properties
b) the percentage by volume of fuel in the mixture
c) the percentage by volume of air in the mixture
d) the percentage by mass of fuel in the mixture
e) the percentage by weight of fuel in the mixture

Answer 6

b) the percentage by volume of fuel in the mixture

Question 7

Methane when combined with air has a flammable limit of
between
a) 4.3 - 45.5%
b) 0.7 - 5.0%
c) 1.1 - 7.5%
d) 2.2 - 9.5%
e) 5.0 - 15.0%

Answer 7

e) 5.0 - 15.0%

Question 8

Washing steam should enter a tank car or tank truck slowly so
as to
a) prevent injury to the worker
b) allow for proper ventilation of the unit
c) prevent massive condensation of the steam within the tank
d) flush the tank gradually
e) reduce the risk of static electricity spark

Answer 8

e) reduce the risk of static electricity spark

Question 9

About 90% of loading-rack tank fires are a result of

a) applying flushing steam too rapidly
b) workers smoking
c) improper switch loading procedures
d) not grounding the vehicles
e) loading vehicles not suitable for the product

Answer 9

c) improper switch loading procedures

Question 10

Loading rack fires are often caused
a) by sparks from electrical equipment
b) from the catalytic effect of fresh metallic surfaces
c) from cigarettes or matches
d) when products with high flash points are loaded after
products with low flash points
e) by hot steam lines

Answer 10

d) when products with high flash points are loaded after

products with low flash points

Question 11

When loading containers with LPG products, the gauge rod
a) releases moisture from the bottom of the tank
b) minimizes the pressure increase as the product enters
c) monitors the static charge produced by the flow of the
product
d) indicates the level of liquid in the tank
e) provides indication of temperature changes as the tank
fills with the LPG product

Answer 11

d) indicates the level of liquid in the tank

Question 12

Laws governing the storage and transporting of LPG are
enforced by the
a) CSA
b) Federal and Provincial DOT
c) Provincial OH&S
d) Bureau of Explosives
e) Provincial Department of Labour

Answer 12

b) Federal and Provincial DOT

Question 13

Outage is the term given to
a) vapours which are vented to the atmosphere during tank
filling
b) liquids spilled during the filling process
c) liquid which remains in the tank after being emptied
d) the space above the liquid after the tank is filled
e) vapours used to “purge” the tank before filling

Answer 13

d) the space above the liquid after the tank is filled

Question 14

The explosion of a flammable mixture that occurred at
the exact time a valve was opened was likely due to
a) a rich mixture being formed
b) the flash point being reached
c) static electricity
d) the auto-ignition temperature
e) the catalytic effect of the fresh metallic surface

Answer 14

e) the catalytic effect of the fresh metallic surface

Question 15

Hoses used for loading and unloading of LPG products must be
hydrostatically tested
a) after every use
b) prior to initial sale to the customer
c) annually
d) when the first visual sign of deterioration appears
e) every three years

Answer 15

c) annually

Question 16

If a fuel/air mixture is raised above its ignition
temperature, the mixture
a) may ignite without a source of ignition
b) will require a source of ignition in order to burn
c) will not start burning by auto-ignition
d) will ignite only if static electricity is present
e) will not burn, only explode

Answer 16

a) may ignite without a source of ignition

Question 17

Every effort must be made to prevent oxygen contacting
hydrocarbon vapours because
a) an explosion will result
b) there are too many sources of ignition
c) auto-ignition will occur
d) the air will dilute the mixture
e) hydrocarbon vapours have such high ignition temperatures

Answer 17

b) there are too many sources of ignition

Question 18

The ignition temperature of a fuel/air mixture is the
a) lowest temperature at which a mixture will burn
b) temperature at which it is said to have a lean mixture
c) temperature at which the fuel may gel
d) temperature at which the mixture is above the boiling
temperature
e) maximum temperature of the mixture before the fuel turns
to vapour

Answer 18

a) lowest temperature at which a mixture will burn

Question 19

Auto-ignition of a fuel/air mixture
a) cannot occur without a flame
b) requires a spark
c) occurs when the temperature of the mixture is raised
above the ignition temperature
d) occurs when temperatures exceed 295 degrees Celsius
e) most often leads to a catalytic effect

Answer 19

c) occurs when the temperature of the mixture is raised

above the ignition temperature

Question 20

Iron sulphide, if allowed to dry out will

a) burst into flames in the pressure of air
b) make an excellent Class D fire extinguishing agent
c) enhance the effects of static electricity
d) emit toxic fumes
e) absorb moisture from railway tank cars

Answer 20

a) burst into flames in the pressure of air