Test Practice Flashcards
Key safety categories to be considered by a gas technician
Personal. Tools. Equipment. Others. Site. OHSA. Ontario gas utilization code
How would a gas technician demonstrate a concern for the safety of others
Demonstrating the correct use of a new tool to a co worker
What should a gas technician do when a new piece of equipment is introduced for use
Get a copy of the users manual and read it before using the equipment
What does OHSA stand for
Occupational health & safety act
Which regulates workplace safety
The province of Ontario
What should MSDS sheets be used for by a technician
Flammable. Corrosive. Explosive
Who’s responsible for a hazard
The person who is aware of it
Why should garbage be removed from a job site
Prevent. slips Trips. Falls
Who regulates workplace safety
The province of Ontario
An employer is responsible for
Ensuring safety instruction is provided
Workers must wear protective clothing that …
Employer instructs them to wear
Workers compensation board act says that in all cases of injury or disease an employer must
Make sure there is a record of the first aid treatment and any advice given to the worker
According to workers compensation board act what is the workers obligation in all cases of injury/ disease
Notify the employer within 8 hours
How many classes of fire extinguishers
5 ( A,B,C, D, K)
Key pieces of PPE
Hard hat. Gloves. Ear plugs. Dust mask. Safety glasses. Work boots. Face shield
What fastener would you use to join 2 electrical conductors
Marrette
Fastener used to connect a hose to a fan coil unit is
Gear clamp
Shot for powder activated guns is stored
In a dry secure location
Purpose of a drill gauge
Measure diameter of a drill bit
How to determine the indicated gas pressure on a U tube manometer
Pressure side added to amount displaced on atmospheric side
7” w.c equals what psig
1/4 psig
The boiling point of water is
212F. 100C
How should you disconnect an electric drill
Pulling plug at outlet
Carbon bit is used for
Steel
Carbide bit is used for
Concrete
Lead shields are used to anchor fasteners into
Concrete
Copper wire should be skinned with
Wire strippers
Specific gravity of vapour is (definition)
The weight of the gas compared to the weight of an equal volume of air
The specific gravity of propane vapour is _ than air
Greater than air
The specific gravity of propane is
1.52” w.c
Lower and upper flammable limits of propane are ?
2.4% to 9.5%
Heat content of 1 cubic foot of propane is
2500 btu
Propane and natural gas are composed of mainly what elements
Carbon. Hydrogen
Ignition temperature of propane is
920F - 1020F
Relative density of propane is _ the density of air
1 1/2 times
Boiling point of propane at atmospheric pressure is
-44F
When propane changes from liquid to vapour it expands and its volume increases how many times
185 times out of
One imperial gallon of propane weighs
5.1 pounds
When one pound of propane burns it realeases approximately how many btu
21,600 btu
The products of propane combustion are
H20. CO2. Heat
As temper of liquid in propane tank increases, vapour pressure
Increases
The amount of CO2 produced per cubic foot of propane burned is
3 cu ft
The amount of air required to burn 1 cubic foot of propane is approximately
25 cu ft
The air found in the products of combustion after the complete combustion of natural gas is called
Excess air
What gas is toxic
Carbon monoxide
Air that is mixed with fuel prior to ignition is called
Primary air
Air that is mixed with fuel at the point of combustion and around the flame is
Secondary air
Carbon monoxide is a product of incomplete combustion of
Hydro carbon
Air is about
80% nitrogen 20% oxygen
A luminous flame is caused by
Not premixing air and fuel prior to combustion
A Bunsen flame is caused by
premixing air and fuel prior to combustion
The specific gravity of natural gas is _ than air
Less than that of air
Natural gas and propane are composed mainly of
Carbon and nitrogen
The flame temperature of natural gas is approximately
3500F
Theoretical boiling point of natural gas at atmospheric pressure is
-259F
The products of complete combustion of natural gas and propane are primarily
Water (vapour). Carbon dioxide. Heat
The amount of air required to burn 1 cubic foot of natural gas is
10 cu ft
The odorant added to natural gas for detection purposes is
Mercaptan
What is the approximate ignition temperature of natural gas
1200F
The specific gravity of natural gas is
0.60
The major constituents of flue gases after the proper combustion of natural gas in air are
CO2. H2O. N2. O2. Heat
A Bunsen flame is characterized by its
Blue appearance
The two main hydrocarbons which form natural gas are
Methane and ethane
What theoretical gas to air ratio is necessary to achieve perfect combustion with an atmospheric natural gas burner
1 part gas 10 parts air
Carbon monoxide is produced through
Incomplete combustion
The products of complete combustion of natural gas in air are
Carbon dioxide . water vapour. Heat
If a natural gas flame is adjusted to produce more than 10% carbon dioxide
Carbon monoxide may be produced
What could result if a flame is adjusted with too much primary air
Flame lift
Carbon dioxide and nitrogen are
Inert gases
Natural gas is 85 to 90%
Methane
How much air is required to burn 1000 cubic feet of natural gas per hour
10,000 cu ft
One boiler horsepower is approximately
34000 Btu (10kW)
Two undesirable products of incomplete combustion are
CO. Aldehydes
Which substance is inert and passes through the combustion zone absorbing heat during the combustion process
Nitrogen
The relative density of liquid propane is approximately
0.5
Propane is a
Hydrocarbon
At 60F a pound of propane produces how many cubic feet of gas
8.50
Propane shall have a distinctive odour content to ensure it is readily detectable down to concentrations of
20% lower explosive limit
Upper and lower limits of flammability- gas and air mixture
4 to 14%
Carbon monoxide is
A toxic gas that’s combustible
The heat content of 1 cubic foot of natural gas is
1000 Btu
Which organization is responsible for administering fuel regulations for installation of gas and oil appliances
TSSA
Who can certify gas appliances
Canadian gas association. Underwriters laboratories. CSA. TSSA
Propane cylinders in Ontario must be manufactured and approved to the requirements of
Transport Canada
