What is the concentration of xylene in this room?How long can this operator be exposed without any control and still respect both limits?
The lower explosive limit of xylene is 1%.
In a room where xylene solution is being sprayed, an engineer uses a calibrate combustible gas meter to determine that the xylene concentration is 10% of the LEL.
What is the concentration of xylene in this room?
1,000 parts per million
10,000 parts per million
9% great that the LEL of xylene
11% greater than the LEL of xylene
What is the flow rate of air moving through a portable blowers with a velocity of 120 FT/Min, through ha pipe of diameter 10 inches
0.425 ft3/min
7 ft3/min
54 ft3/min
9,420 ft3/min
An operator is working on a piece of machinery that is producing noise at 105 DBA. The company threshold level is at 85 DBA with 5 DBA exchange rate. The local authority is 90 DBA with 3 DBA exchange rate.
How long can this operator be exposed without any control and still respect both limits?
Less than 5 minutes
15 minutes
30 minutes
1 hour
A company has decided to perform one random safety audit monthly of their 10 crews. The following are near miss points the crews accrued over the last year.
Crew 1 = 55
Crew 2 = 30
Crew 3 = 56
Crew 4 = 40
Crew 5 = 45
Crew 6 = 25
Crew 7 = 28
Crew 8 = 49
Crew 9 = 40
Crew 10 = 32
A crew is considered to be eligible for the safety audit if it accrued near miss points higher than 40
Which is the probability of a crew being selected for a safety audit?
