Question

1. the most life - threatening hazards on a construction site typically include all of the following, except

a. falls
b. electric shock
c. being crushed or struck by falling or flying objects
d. chemical burns

1. if a persons heart begins to fibrillate due to an electrical shock, the solution is to

a. leave the person alone until the fibrillation stops
b. immerse the person in ice water
c. use the heimlich maneuver
d. have a qualified person use a defibrillator

1. low - voltage conductors

a. are not powerful enough to cause death from electrocution
b. must exceed 480v to cause death
c. are responsible for most electrocution deaths due to the frequency of contact
d. are unlikely to cause injury if rubber - soled shoes are worn

1. a shock of 5ma can cause injury through

a. respiratory arrest
b. suffocation
c. involuntary movement
d. electrical burns

1. scheduling off - shift maintenance work is a type of

a. hazard elimination
b. engineering control
c. hazard substitution
d. administrative control

1. a machine guard is a type of

a. hazard elimination
b. engineering control
c. hazard substitution
d. administrative control

1. a work permit is a type of

a. hazard elimination
b. engineering control
c. hazard substitution
d. administrative control

1. the least effective method of preventing risk is through the use of

a. elimination
b. substitution
c. engineering controls
d. ppe

1. the type of hard hat that can withstand a voltage of 20,000vac for three minutes is a

a. class a
b. class c
c. class e
d. class g

1. class 0 rubber gloves are used when working with voltages less than

a. 500 volts
b. 1,000 volts
c. 5,000 volts
d. 7,500 volts

1. an important use of a hot stick is to

a. replace busbars
b. test for voltage
c. replace fuses
d. test for continuity

1. which of these statements correctly describes a double - insulated power tool?

a. there is twice as much insulation on the power cord.
b. it can safely be used in place of a grounded tool.
c. it is made entirely of plastic or other non - conductive material.
d. the entire tool is covered in rubber.

Explanation:

1. Chemical burns are less life - threatening compared to falls, electric shock, and being crushed on a construction site.
2. A defibrillator is used to treat cardiac fibrillation caused by electrical shock.
3. Low - voltage conductors can be dangerous and cause electrocution deaths.
4. A 5mA shock can cause involuntary movement.
5. Scheduling off - shift maintenance is an administrative control.
6. A machine guard is an engineering control.
7. A work permit is an administrative control.
8. Personal Protective Equipment (PPE) is the least effective in preventing risk compared to elimination, substitution, and engineering controls.
9. Class E hard hats can withstand 20,000VAC for three minutes.
10. Class 0 rubber gloves are used for voltages less than 500 volts.
11. A hot stick is used to test for voltage.
12. A double - insulated power tool has twice as much insulation on the power cord.

Answer:

1. d. chemical burns
2. d. have a qualified person use a defibrillator
3. c. are responsible for most electrocution deaths due to the frequency of contact
4. c. involuntary movement
5. d. administrative control
6. b. engineering control
7. d. administrative control
8. d. PPE
9. c. Class E
10. a. 500 volts
11. b. test for voltage
12. a. There is twice as much insulation on the power cord.