Chapter 3

Question 1

Define a competent person

Answer 1

A person capable of identifying existing and predictable hazards.

Question 2

Where should flaggers be located?

Answer 2

Flaggers should be positioned 100 feet in front of the work zone.
Flagger sign should be placed 500 feet minimum.

Question 3

What is a confined space defined as?

Answer 3

Large enough that an employee can enter

Limited or restricted means for entry or exit

Not designed for continuous occupancy

Question 4

What are the classifications of confined space

Answer 4

Permitted

Non-permitted

Question 5

Define a hazardous atmosphere

Answer 5

Atmosphere that may expose employees to risk of death, incapacitation, impairment of ability to self rescue.

Question 6

Define oxygen deficiency

Answer 6

Less than 19.5% oxygen levels

Question 7

Define oxygen enrichment

Answer 7

Greater than 23.5 percent oxygen by volume.

Question 8

Define methane gas.

Answer 8

Colorless, odorless and tasteless. The major flammable gas in natural gas pipelines. 55% as heavy as air.

Question 9

Define toxicants.

Answer 9

Substance that can act as poisons.

Question 10

Define a confined space

Answer 10

Any manhole, sewer, diversion structure, pump station, underground metering vault.

Question 11

What are the 4 most common repirators?

Answer 11

Self contained breathing apparatus SCBA
Supplied air respirator SAR
powered air purifying respirator PAPR
Air purifying respirator APR

Question 12

What should atmospheric analyzer contain?

Answer 12

Audible and Visable alarm that will warn when flammable gasses exceed 10 % of the LEL or when oxygen drops below 19.5% or rises above 23.5%.

Question 13

Atmospheric testing equipment is just one tool and should not be considered the ultimate test for the presence of explosive gasses.

Answer 13

They should not preclude the use of ventilation of some sort in the confined space. Ventilate for 10 minutes prior to entry.

Question 14

When should atmospheric testing stop?

Answer 14

Atmospheric testing must continue while space is occupied.

Question 15

How many operators should be present for manhole entry.

Answer 15

3.

Question 16

How far should spoil be set back from the excavated area.

Answer 16

2 feet.

Question 17

Define shoring.

Answer 17

A complete framework of wood or metal designed to support the walls of a trench.

Question 18

Define sheeting.

Answer 18

Sheeting is the solid material placed directly against the side of the trench. Fully dimensional rough cut timber.

Question 19

Who should work on electricity.

Answer 19

The first rule that applies to electrical systems: if you are not qualified, do NOT, under any circumstances, attempt to work on electrical systems.

Question 20

Define a tailgate safety meeting.

Answer 20

Brief safety meetings held every 7 to 10 days.

Question 21

Define lock out / tag out.

Answer 21

OSHA standards require that all equipment that could unexpectedly start up or release stored energy be locked and tagged whenever it is being worked on.

Question 22

Define Safety Data Sheets. SDS.

Answer 22

Source of information about hazards and obtain advice on safety precautions.

Question 23

What is the alarm set point for hydrogen sulfide

Answer 23

10 PPM

Question 24

What is the minimum level of oxygen in the air for safe breathing?

Answer 24

19.5 %

Question 25

Define GFCI

Answer 25

Ground fault circuit interrupter is a device that senses the amount of current flowing on the two conductors of an electric circuit.