CHST TEST QUESTIONS WITH 100% CORRECT ANSWERS UPDATED
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Course
CHST
Institution
CHST
CHST TEST QUESTIONS WITH 100% CORRECT ANSWERS UPDATED
In underground excavation ventilation doors must be designed to - Answer-Remain closed when in use regardless of the direction of airflow. Ventilation doors are designed to provide a barrier to dangerous fumes should they build up in adjacent ...
CHST TEST QUESTIONS WITH 100%
CORRECT ANSWERS UPDATED
2024-2025
In underground excavation ventilation doors must be designed to - Answer-Remain
closed when in use regardless of the direction of airflow. Ventilation doors are designed
to provide a barrier to dangerous fumes should they build up in adjacent areas
Underground entry and exit points must be strictly controlled with - Answer-Appropriate
safety signs
When ever any employee is working underground - Answer-A designated person must
be present above ground
When workers are working underground the designated person is required to - Answer-
Keep a running count of the number of underground workers and to secure
communicate a rescue response when necessary
Whenever employees working underground number 25 or more regulations require that
- Answer-The employer make contingency plans with locally available trained rescue
personnel
When 25 or more employees are working underground contingency must be made for -
Answer-2 Rescue teams. One team must be located within a half hour travel distance
the other must be within a two hour travel period.
If less than 25 persons are working underground contingency plans may involve -
Answer-A Single rescue crew within 1/2 an hour travel time from the job site
When digging a trench 20 ft deep or deeper it is required to - Answer-Have a engineer
to design a safe strong reliable way of shoring up excavation
Clay is a Type. At 20ft or less can be sloped at - Answer-Type A. Sloped at 53 degrees
or 3/4:1
Gravel and silt are type. - Answer-B. At 20 ft or less can be sloped at 45 degrees or 1:1
ratio
Sand is Type - Answer-Type C. 34 degrees or 1 1/2:1
Solid rock is the only material in which - Answer-Vertical walls are allowed
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