C-8 Concrete Quiz

Welcome to your free C-8 Concrete Quiz

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. 
What is the minimum rating for a service disconnecting means when supplied with a 120/240-volt, 3-wire, single phase service for a one-family dwelling?

15. 
During lightning events, limiting the length of the primary protector grounding conductors for communications circuits assists in reducing voltage between the buildings communications systems and __________.

16. 
General-use dimmer switches shall be used only to control permanently installed ___________ luminaries (lighting fixtures).

17. 
On a metal wireway cross-section, what is the maximum percent that may be occupied by conductors, splices, and taps at any point?

18. 
What is the minimum volume, in inches, required of a two (2) gang device box that is to contain two (2) size 14/2 AWG with ground NM cables and two (2) size 12/2 AWG with ground NM cables connected to a duplex receptacle connected to a single-pole switch, which also contain four (4) cable clamps?

19. 
What is the minimum allowable trade size intermediate metal conduit (IMC) required to contain a total of ten (10) copper THW conductors in a 20 foot run, five (5) size 1 AWG and five (5) size 3 AWG?

20. 
A test of the complete legally required standby system when installed must be conducted and witnessed by the __________.