CHST Study Guide: Questions With A+ Solutions, Expert
Verified
If angle A is 63.4 deg, What is the length of side C? Tangent side of angle A is 5,
and adjacent side is 10. Right Ans - Sin A = a/c, Sin 63.4=10/c, c=10/sin
63.4=11.2
What is the angle of the ramp that rises 4 feet in a 10 feet run? Right Ans -
Tan A = a/b, Tan A = 4/10, A = Arc Tan [4/10], A = 21.801
Based on the allowable limits in the table below if the noise in a work area
was 95 dBA for 3 hours, 90 dBA for 5 hours and 85 dBA for 2 hours, is the
allowable limited exceeded? Right Ans - C = Time exposed and T =
Allowable time exposed
C1/T1 + C2/T2 + C3/T3 + Cn/Tn
Anything > 1 is exposure not allowed
3/4+5/8+2/no limit = 1.375 > 1
If a vessel contains 70% air and 30% hydrocarbons what is the oxygen
content of the vessel? Right Ans - Normal air contains 21% oxygen by
volume. The vessel only contains 70% normal air. Therefore 0.7x.21 = 0.147
or 14.7%
Compute the TWA concentration from the following measurement data: 0700-
1000 hrs. @ 100 ppm; 1000-1200 hrs. @ 200 ppm; 1300-1400 hrs hrs. @ 0
ppm; and 1400-1600 hrs. @ 100 ppm. Right Ans - C = PPM exposed to and
T = Time exposed to
Sum of (C1xT1) + (C2xT2) + (C3xT3) + (C4xT4) divided by the Sum of T1 + T2
+ T3 + T4
300+400+0+200=+2+1+2=8 = 112.5
If a job site operation results in a $45,000 loss every 3 years, what is the
expected loss over a period of years? Right Ans - Solve for yearly loss,
45,000/3 = 15,000
Multiply by 12, 15,000x3 = 180,000
A radioisotope has a half-life of 1 year. How many years will it take to reduce
the initial activity to less than 10%. Right Ans - 4 years
,100% 1 year = 50%, 2 Years = 25%, 3 years = 12.5, 4 years = 6.25%
How much does a 55 gallon drum of acid weigh, if the specific gravity of the
acid is 2.1. Note water weighs 8.34 lbs per gallon? Right Ans - Specific
gravity (SG) is the ratio of a substance compared to an equal volume of water.
In this case one gallonof acid weighs 2.1 time the weight of water. The
Formula then becomes # of gallons x 8.34 x SG.
55X8.34x2.1 = 963.3 lbs
A 1200 lbs load is lifted with a 2 leg sling whose legs are at 30 Deg angel with
the load. The stress on each leg is? Right Ans - Sin A = a/c, c=a/sin A,
c=600/sin 30, c=1200 lbs
A 20,000 lbs load is lifted with a 2 leg sling whose legs are at 60 Deg angel
with the load. The stress on each leg is? Right Ans - Sin A = a/c, c=a/sin A,
c=10000/sin 60, c=11547 lbs
A 25,000 lbs weight is suspended by two equal length cables as a bar with two
hoist lines forming a triangle a 100 Deg angle. What the stress on each line?
Right Ans - Separate into a single right triangle carrying half of the load.
Reorient and label (the 40 Deg is complimentary)
Sin A = a/c, c=a/sin A, c=12500/sin 40, c=19450 lbs
Calculate the WBGT index from the following information. Outdoor
temperature of 98 Deg, wet-bulb temperature of 90 Deg, and dry-bulb of 94
Deg. Right Ans - Outdoor Formula: 0.7WB+0.2GT+0.1DB
0.7x98+0.2x90+0.1x94 = 92
Calculate the WBGT index from the following information. Indoor
temperature of 91 Deg, wet-bulb temperature of 97 Deg. Right Ans - Indoor
Formula: 0.7WB+0.3GT
0.7x87+0.3*91 = 112.1
How much force does it take to push a handcart that weighs 90 lbs and is
carrying a 150 lbs load? the cart wheels have a coefficient of friction of .09.
Right Ans - F=(Micro)N
F=0.09x(90+150)
F+21.6lbs
,Your plant manufactures electronics parts. These parts are moved throughout
the plant using four wheel handcarts, which weigh 65 lbs. the coefficient of
friction for the cart is 0.12. What weight can be carried by the cart with 22 lbs
pushing force? Right Ans - F=(Micro)N
22=0.12xN
22/0.12=N
N=183
N=183-65(cart)=118 lbs
What is the Log of Work-Related Injuries and Illnesses? Right Ans - OSHA
Form 300
What is the Summary of Work-Related Injuries and Illnesses? Right Ans -
OSHA Form 300A
What regulation states that employees have the right to review your injury
and illness records? Right Ans - 29 CFR 1904.35
What is considered a work-related injury or illness? Right Ans - If an event
or exposure in the work environment caused or contributed to the condition
or significantly aggravated a preexisting condition.
Which work-related injuries and illnesses should you record? Right Ans -
Death, loss of consciousness, days away from work, restricted work activity or
job transfer, or medical treatment beyond first aid.
When do you need to determine whether a workplace injury or illness is
recordable? Right Ans - Within 7 days
Under what circumstances should you NOT enter the employee's name on the
OSHA Form 300? Right Ans - Injury or illness to intimate body part or
reproductive system, injury or illness from a sexual assault, Mental Illness,
HIV infection, hepatitis, or tuberculosis, needle stick injury or cut from sharp
object contaminated with blood
When must you post the summary? (OSHA 300A) Right Ans - February 1st
- April 30
How long must you keep the Log and Summary on file? Right Ans - 5 years
, What is an incident rate? Right Ans - The number fo recordable injuries
and illnesses occurring among a given number of full-time workers (usually
100 fulltime workers) over a given period of time (usually a year)
How do you calculate an incident rate? Right Ans - Total number of injuries
and illness/Numbers of hours worked by all employees x 200,000 hours =
Total recordable case rate
Where does the 200,000 comes from in the incident rate? Right Ans - The
200,000 figure in the formula represents the numbers of hours 100
employees working 40 hours per week, 50 weeks per year would work, and
provides the standard base for the calculating incidence rates.
What is a DART? Right Ans - Days away from work, days of restricted work
activity or job transfer
How do you calculate DART incidence rate? Right Ans - (Number of entries
in column H + Numbers of entries in column I) / Number of hours worked by
all employees x 200,000 hours = DART incidence rate
What is the vehicle accident rate of an operation experiencing 25 accidents
while traveling 2,000,000 miles? Right Ans - Vehicle incident rates are
computed per 1,000,000 miles.
25 x 1,000,,000,000 = 12.5
What is the OSHA DART given the following: Hours worked = 1,456,900
straight time and 243,100 time and half. 114 cases resulting in medical
attention. 22 cases resulting in restricted work or motion. 2 cases resulting in
days away from work? Right Ans - 24x 200,000/1,700,00 = 2.82
What is ANSI Z16.2? Right Ans - Designed to provide a standardized
method of recoding certain accidents facts.
What would be the most appropriate "rate" in comparing accident
performance of serval plants within a company? Right Ans - Incident rates.
The numbers of injuries, illness or lost workdays related to a common
exposure base of 100 full0time workers is the "Incident Rate" and is the best
indicator with which to make interindustry comparisons.
Verified
If angle A is 63.4 deg, What is the length of side C? Tangent side of angle A is 5,
and adjacent side is 10. Right Ans - Sin A = a/c, Sin 63.4=10/c, c=10/sin
63.4=11.2
What is the angle of the ramp that rises 4 feet in a 10 feet run? Right Ans -
Tan A = a/b, Tan A = 4/10, A = Arc Tan [4/10], A = 21.801
Based on the allowable limits in the table below if the noise in a work area
was 95 dBA for 3 hours, 90 dBA for 5 hours and 85 dBA for 2 hours, is the
allowable limited exceeded? Right Ans - C = Time exposed and T =
Allowable time exposed
C1/T1 + C2/T2 + C3/T3 + Cn/Tn
Anything > 1 is exposure not allowed
3/4+5/8+2/no limit = 1.375 > 1
If a vessel contains 70% air and 30% hydrocarbons what is the oxygen
content of the vessel? Right Ans - Normal air contains 21% oxygen by
volume. The vessel only contains 70% normal air. Therefore 0.7x.21 = 0.147
or 14.7%
Compute the TWA concentration from the following measurement data: 0700-
1000 hrs. @ 100 ppm; 1000-1200 hrs. @ 200 ppm; 1300-1400 hrs hrs. @ 0
ppm; and 1400-1600 hrs. @ 100 ppm. Right Ans - C = PPM exposed to and
T = Time exposed to
Sum of (C1xT1) + (C2xT2) + (C3xT3) + (C4xT4) divided by the Sum of T1 + T2
+ T3 + T4
300+400+0+200=+2+1+2=8 = 112.5
If a job site operation results in a $45,000 loss every 3 years, what is the
expected loss over a period of years? Right Ans - Solve for yearly loss,
45,000/3 = 15,000
Multiply by 12, 15,000x3 = 180,000
A radioisotope has a half-life of 1 year. How many years will it take to reduce
the initial activity to less than 10%. Right Ans - 4 years
,100% 1 year = 50%, 2 Years = 25%, 3 years = 12.5, 4 years = 6.25%
How much does a 55 gallon drum of acid weigh, if the specific gravity of the
acid is 2.1. Note water weighs 8.34 lbs per gallon? Right Ans - Specific
gravity (SG) is the ratio of a substance compared to an equal volume of water.
In this case one gallonof acid weighs 2.1 time the weight of water. The
Formula then becomes # of gallons x 8.34 x SG.
55X8.34x2.1 = 963.3 lbs
A 1200 lbs load is lifted with a 2 leg sling whose legs are at 30 Deg angel with
the load. The stress on each leg is? Right Ans - Sin A = a/c, c=a/sin A,
c=600/sin 30, c=1200 lbs
A 20,000 lbs load is lifted with a 2 leg sling whose legs are at 60 Deg angel
with the load. The stress on each leg is? Right Ans - Sin A = a/c, c=a/sin A,
c=10000/sin 60, c=11547 lbs
A 25,000 lbs weight is suspended by two equal length cables as a bar with two
hoist lines forming a triangle a 100 Deg angle. What the stress on each line?
Right Ans - Separate into a single right triangle carrying half of the load.
Reorient and label (the 40 Deg is complimentary)
Sin A = a/c, c=a/sin A, c=12500/sin 40, c=19450 lbs
Calculate the WBGT index from the following information. Outdoor
temperature of 98 Deg, wet-bulb temperature of 90 Deg, and dry-bulb of 94
Deg. Right Ans - Outdoor Formula: 0.7WB+0.2GT+0.1DB
0.7x98+0.2x90+0.1x94 = 92
Calculate the WBGT index from the following information. Indoor
temperature of 91 Deg, wet-bulb temperature of 97 Deg. Right Ans - Indoor
Formula: 0.7WB+0.3GT
0.7x87+0.3*91 = 112.1
How much force does it take to push a handcart that weighs 90 lbs and is
carrying a 150 lbs load? the cart wheels have a coefficient of friction of .09.
Right Ans - F=(Micro)N
F=0.09x(90+150)
F+21.6lbs
,Your plant manufactures electronics parts. These parts are moved throughout
the plant using four wheel handcarts, which weigh 65 lbs. the coefficient of
friction for the cart is 0.12. What weight can be carried by the cart with 22 lbs
pushing force? Right Ans - F=(Micro)N
22=0.12xN
22/0.12=N
N=183
N=183-65(cart)=118 lbs
What is the Log of Work-Related Injuries and Illnesses? Right Ans - OSHA
Form 300
What is the Summary of Work-Related Injuries and Illnesses? Right Ans -
OSHA Form 300A
What regulation states that employees have the right to review your injury
and illness records? Right Ans - 29 CFR 1904.35
What is considered a work-related injury or illness? Right Ans - If an event
or exposure in the work environment caused or contributed to the condition
or significantly aggravated a preexisting condition.
Which work-related injuries and illnesses should you record? Right Ans -
Death, loss of consciousness, days away from work, restricted work activity or
job transfer, or medical treatment beyond first aid.
When do you need to determine whether a workplace injury or illness is
recordable? Right Ans - Within 7 days
Under what circumstances should you NOT enter the employee's name on the
OSHA Form 300? Right Ans - Injury or illness to intimate body part or
reproductive system, injury or illness from a sexual assault, Mental Illness,
HIV infection, hepatitis, or tuberculosis, needle stick injury or cut from sharp
object contaminated with blood
When must you post the summary? (OSHA 300A) Right Ans - February 1st
- April 30
How long must you keep the Log and Summary on file? Right Ans - 5 years
, What is an incident rate? Right Ans - The number fo recordable injuries
and illnesses occurring among a given number of full-time workers (usually
100 fulltime workers) over a given period of time (usually a year)
How do you calculate an incident rate? Right Ans - Total number of injuries
and illness/Numbers of hours worked by all employees x 200,000 hours =
Total recordable case rate
Where does the 200,000 comes from in the incident rate? Right Ans - The
200,000 figure in the formula represents the numbers of hours 100
employees working 40 hours per week, 50 weeks per year would work, and
provides the standard base for the calculating incidence rates.
What is a DART? Right Ans - Days away from work, days of restricted work
activity or job transfer
How do you calculate DART incidence rate? Right Ans - (Number of entries
in column H + Numbers of entries in column I) / Number of hours worked by
all employees x 200,000 hours = DART incidence rate
What is the vehicle accident rate of an operation experiencing 25 accidents
while traveling 2,000,000 miles? Right Ans - Vehicle incident rates are
computed per 1,000,000 miles.
25 x 1,000,,000,000 = 12.5
What is the OSHA DART given the following: Hours worked = 1,456,900
straight time and 243,100 time and half. 114 cases resulting in medical
attention. 22 cases resulting in restricted work or motion. 2 cases resulting in
days away from work? Right Ans - 24x 200,000/1,700,00 = 2.82
What is ANSI Z16.2? Right Ans - Designed to provide a standardized
method of recoding certain accidents facts.
What would be the most appropriate "rate" in comparing accident
performance of serval plants within a company? Right Ans - Incident rates.
The numbers of injuries, illness or lost workdays related to a common
exposure base of 100 full0time workers is the "Incident Rate" and is the best
indicator with which to make interindustry comparisons.
