The top of an extension ladder rests against a wall 4.8 m above the ground. How far from the wall should the base of the ladder be?
1.2 m The standard ladder angle is 4 to 1: for every 4 m of height to the point where the ladder rests, the base goes 1 m out from the wall. 4.8 m ÷ 4 = 1.2 m.
You've isolated a machine and put your personal lock and tag on the disconnect. What should you do before starting work on it?
Try to start the machine to confirm there's no energy Lockout is only finished when you've verified a zero-energy state. You try the normal start controls (then return them to off) and check for stored energy, so you know the right source was isolated.
Which of these is one of the three basic rights workers have under Canadian occupational health and safety laws?
The right to refuse unsafe work Across Canada, health and safety laws give workers three basic rights: the right to know about hazards, the right to participate in health and safety, and the right to refuse unsafe work.
Under WHMIS, which document gives detailed information about a hazardous product, such as first aid, safe handling and what to do in a spill?
The safety data sheet (SDS) The safety data sheet is the detailed document. WHMIS SDSs have 16 sections, covering hazards, first aid, firefighting, spills, handling and storage, and protective equipment.
What does the WHMIS pictogram showing a flame over a circle mean?
Oxidizing hazard The flame over a circle means an oxidizer. Oxidizers can cause or strongly feed a fire by giving off oxygen, so they must be kept away from fuels and flammable products.
What must a WHMIS workplace label include?
The product identifier, safe handling information and a note that an SDS is available A workplace label needs three things: the product identifier (its name), information for handling it safely, and a statement that a safety data sheet is available.
What does a ground fault circuit interrupter (GFCI) do?
It cuts the power when current leaks to ground, to protect people from shock A GFCI compares the current going out on one conductor with the current coming back. If some current is leaking to ground, for example through a person, it cuts the power within a fraction of a second.
Before you mount a new abrasive wheel on a grinder, what must you check?
That the wheel's maximum rated speed is at least the grinder's speed Every abrasive wheel is marked with a maximum safe speed. If the grinder spins faster than that rating, the wheel can burst. The wheel's rating must be equal to or higher than the grinder's speed.
A power tool is marked with a square inside another square. What does this mean?
The tool is double insulated The square-in-a-square symbol means double insulated. The tool has two layers of insulation between live parts and the parts you touch, so it doesn't rely on a ground pin and often has a two-prong plug.
A measurement is 2 ft 6 in. What is that in millimetres?
762 mm 2 ft 6 in is 30 in. One inch is exactly 25.4 mm, so 30 × 25.4 = 762 mm.
To check that a corner is square, you measure 1.8 m along one line and 2.4 m along the other. What should the diagonal between those two marks measure?
3.0 m This is the 3-4-5 method. 1.8 and 2.4 are 3 and 4 times 0.6, so the diagonal is 5 × 0.6 = 3.0 m. You can check it with the Pythagorean theorem: 1.8² + 2.4² = 3.24 + 5.76 = 9, and the square root of 9 is 3.
A concrete slab is 6 m long, 4 m wide and 100 mm thick. How much concrete does it need, before any allowance for waste?
2.4 m³ Volume is length × width × height, all in the same unit. 100 mm is 0.1 m, so 6 × 4 × 0.1 = 2.4 m³.
What is the area of a round opening with a diameter of 0.6 m? Use π = 3.14.
0.28 m² The area of a circle is π × r². The radius is half the diameter, 0.3 m. 0.3² = 0.09, and 0.09 × 3.14 = 0.2826, or about 0.28 m².
On a drawing at a scale of 1:50, a wall measures 64 mm. How long is the real wall?
3.2 m At 1:50, every unit on the drawing is 50 of the same units in real life. 64 mm × 50 = 3 200 mm, which is 3.2 m.
Which type of drawing view shows the outside face of a building as you'd see it standing in front of it?
Elevation view An elevation shows a vertical face of a building or object, viewed straight on from the front, back or side. It shows heights, windows, doors and finishes.
On a technical drawing, what does a line made of short dashes usually show?
An edge or object hidden from view Short, evenly spaced dashes are hidden lines. They show edges, surfaces or parts you can't see from that view because something is in front of them.
How does a national model code, such as the National Building Code of Canada, become law in a province?
Each province or territory adopts it, with or without changes, through its own laws National model codes are published by the National Research Council of Canada, but they have no legal force on their own. Each province or territory decides whether to adopt them, often with its own changes, and in some places cities adopt codes too.
In codes and regulations, what does "authority having jurisdiction" (AHJ) mean?
The body or official responsible for enforcing the code in that area The authority having jurisdiction is the organization, office or person with the legal power to enforce a code or standard in that place. Often that's a provincial safety authority or a municipal building or inspection department.
A crane operator gives you an instruction over the radio. What's the best way to make sure you both understood it the same way?
Repeat the instruction back and wait for the operator to confirm it Repeating the message back, and getting a confirmation, closes the loop. It catches mistakes before anyone acts on them. This is standard practice for radio communication on work sites.
You're teaching an apprentice a task they haven't done before. Which approach works best?
Explain and demonstrate it, then watch them practise and give feedback Red Seal standards describe mentoring as a series of steps: find out what the learner needs, show them how, let them practise under supervision, and give feedback. That keeps the apprentice safe and builds real skill.
Canada · Trade exam