Free C8 Concrete Exam

Welcome to your free C-8 Concrete Quiz

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1. 
In cold weather, do NOT allow concrete to cool faster than ______ per hour for the first 24 hours.

2. 
When finishing concrete flatwork, dark "trowel burns" are most likely to be caused by which of the following?

3. 
You are hired to fill an abandoned mine. What product are you likely to use?

4. 
Curling of a slab is most often related to:

5. 
When a delamination takes place in a slab surface, the top 1/8 inch layer becomes dense and separates from the base by a thin layer of air or water. Delaminations usually form during:

6. 
Delaminations in concrete can be detected by:

7. 
Expect to see a loss of about ______ air as concrete is conveyed through a pump.

8. 
Weather is considered "cold" when the average daily temperature is less than ______ for more than 3 days in a row AND the air temperature is no more than ______ for more than half a day.

9. 
Fresh concrete freezes if its temperature falls below:

10. 
A drop in concrete temperature by 20°F will ______ the setting time.

11. 
What sort of PPE (personal protective equipment) is recommended when using cleaning solvent?

12. 
What should be done with lifelines, safety harnesses, and shock-absorbing lanyards that have been subjected to impact loading?

13. 
What is the longest standard length of a scaffold plank?

14. 
On a 120V circuit, what color is the (protective) ground wire?

15. 
What is the minimum distance apart that acetylene and oxygen cylinders must be stored?

16. 
Which of the following is a correct method for storing acetylene cylinders?

17. 
Which of the following is the best choice for hoisting a full gas cylinder?

18. 
Cylinders containing ______ shall not be taken into confined spaces.

19. 
A dry chemical or carbon dioxide fire extinguisher rated at least ______ must be kept near operations where bottled fuel gases are being used.

20. 
No more than ______ of paints, solvents, and chemicals may be stored in a room unless an approved safety storage cabinet is present.