CHST 3 Practice Questions and Answers
Minimum air capacity for employees working underground is ? cubic feet per minute of fresh air
is required for each employee. - Answer-200
The OSHA provisions in 1926.800 provide the basis for worksite safety requirements of
underground workers employed in ...
If less than ? persons are working underground, contingency plans may involve a single rescue
crew which must be positioned within ? travel time from the job site. - Answer✔✔-25/half hour
When a trenching system is to be dug to a depth of ? or more, a professional engineer is
required to design a safe, strong, and reliable method of shoring up the excavation. The -
Answer✔✔-20ft
The maximum slope of an excavation into Type A soil is ? degrees. - Answer✔✔-53
Gravel and silt are Type B materials. The maximum height to depth ratio for trenching in Type B
soil is ? yielding a maximum ?degree angle. - Answer✔✔-1:1/45 degrees
Type C is sand, which is very unstable for trenching. The slope angle for a trench into Type C soil
can be no more than ? degrees. - Answer✔✔-34
The only material in which vertical trench walls are allowed is - Answer✔✔-Solid rock
? inspections of excavation sites are required as a minimum but inspections can be made at any
time a change in work, weather, or environmental conditions makes more frequent inspections
desirable. - Answer✔✔-Daily
Means of exit or egress should be inspected. Stairways, ladders, ramps or other safe means of
evacuation from trenches are required in ditches or trenches that are ? feet or more in depth. A
worker should not have to travel more than ? feet to reach a means of safe exit. - Answer✔✔-
4/25
WBGT = ? - Answer✔✔-WBGT = 0.7NWB + 0.2GT + 0.1DB
Page 2/15
The benefits of buying summaries with Stuvia:
Guaranteed quality through customer reviews
Stuvia customers have reviewed more than 700,000 summaries. This how you know that you are buying the best documents.
Quick and easy check-out
You can quickly pay through credit card or Stuvia-credit for the summaries. There is no membership needed.
Focus on what matters
Your fellow students write the study notes themselves, which is why the documents are always reliable and up-to-date. This ensures you quickly get to the core!
Frequently asked questions
What do I get when I buy this document?
You get a PDF, available immediately after your purchase. The purchased document is accessible anytime, anywhere and indefinitely through your profile.
Satisfaction guarantee: how does it work?
Our satisfaction guarantee ensures that you always find a study document that suits you well. You fill out a form, and our customer service team takes care of the rest.
Who am I buying these notes from?
Stuvia is a marketplace, so you are not buying this document from us, but from seller Emillect. Stuvia facilitates payment to the seller.
Will I be stuck with a subscription?
No, you only buy these notes for $9.99. You're not tied to anything after your purchase.
