Question 1

A technique that employs a specific angle of incline on the sides of the excavation : SlopingA structure that supports that sides of an excavation and protects against cave-ins : Shoring

Accepted Answer

Match the following definitions to their related statements as described in the Definitions section of this lesson.

Question 2

Competent person

Accepted Answer

A(n) _______ is capable of identifying existing and predictable hazards in surroundings or working conditions that are unsanitary, hazardous, or dangerous to employees, and has authorization to take prompt corrective measures

Question 3

Trench

Accepted Answer

A narrow underground excavation that is deeper than it is wide and no wider than 15 feet (4.5 meters) is called a

Question 4

annual inspections by a competent person

Accepted Answer

All of the following are OSHA's most cited violations in excavations, except

Question 5

False

Accepted Answer

Structural ramps and runways must be designed by a qualified person

Question 6

When creating a hazard to employees, these must be removed or supported as necessary to safeguard employees working in the area : Surface encumbrancesBefore excavation work can begin, it is necessary to determiine the location of these by safe and acceptable means : Underground utilitiesThese must be designed by a competent person : Structural ramps and runwaysEmployees exposed to this must be provded with high visibility and reflective vests or other suitable garments : Vehicular traffic

Accepted Answer

Matching the following items to their related statements

Question 7

True

Accepted Answer

Before excavation work can begin, it is necessary to determine the location of the utilities underground

Question 8

True

Accepted Answer

Structural ramps and runways must be designed by a competent person

Question 9

Professional engineer : This person approves the determination that the excavation poses no threat to adjacent structures or employeesCompetent person : All equipment and employees must be montiored by this person when water is accumulating

Accepted Answer

Math the following responsibilities to the related persons

Question 10

True

Accepted Answer

Inspections must be made by a competent person after rainstorms and any other hazard-increasing occurrence.

Question 11

False

Accepted Answer

Walkways over excavations must conform to OSHA standards with guardrails over 12 feet.

Question 12

2

Accepted Answer

Spoils and equipment must be set at least _____ feet back from the excavation.

Question 13

All of the above

Accepted Answer

Which of the following are OSHA standards for excavations?

Question 14

120 lbs per cubic foot : Moist soil85 lbs per cubic foot : Dry soil

Accepted Answer

Match the correct weight to the appropriate type of soil

Question 15

Granular cohesion-less soils including angular gravel (similar to crushed rock), silt, silt loam, sandy loam, and, in some cases, silty clay loam and sandy clay : Type BThis is the most stable soil type : Type ACohesive soil with unconfined compressive strength of 0.5 tsf (48 kPa) or less : Type CA natural solid mineral matter that can be excavated with vertical sides and remain intact while exposed : Stable rock

Accepted Answer

Match the following definitions to the appropriate soil types

Question 16

True

Accepted Answer

Type C soil cannot be benched

Question 17

True

Accepted Answer

A 10-foot column of dirt could weigh up to 1,200 pounds

Question 18

All of the above

Accepted Answer

Soil cannot be Type A if it is:

Question 19

Both a) and b)

Accepted Answer

Which of the following is required for protective system equipment?

Question 20

False

Accepted Answer

Hydraulic shoring must be checked weekly for defective parts

Question 21

A professional engineer

Accepted Answer

If it is determined to be unsuitable, all equipment must be removed from service until _______ approves it for use

Question 22

All of the above

Accepted Answer

OSHA requires that all excavations in which employees could potentially be exposed to cave-ins be protected by

Question 23

Stable Rock : Vertical (90 degrees)Type A : 3/4:1 (53 degrees)Type B : 1:1 (45 degrees)Type C : 1 1/2:1 (34 degrees)

Accepted Answer

Match the following soil types to their maximum allowable slopes

Question 24

True

Accepted Answer

Sloping or benching for excavations greater than 20 feet deep must be designed by a registered professional engineer

Question 25

Maximum allowable slope

Accepted Answer

The steepest incline of an excavation face that is acceptable for the most favorable site conditions as protection against cave-ins and is express as the ratio of horizontal distance to vertical rise is called

Question 26

False

Accepted Answer

Benching is allowed in Type C soil

Question 27

The basic types of shoring : Timber and aluminum shoringProvides a critical safety advantage because workers do not have to enter the trench to install them : Aluminum hydraulic shoring This is the more expensive and difficult method of shoring : Timber shoringA structure that supports the sides of an excavation and which is designed to prevent cave-ins : Shoring

Accepted Answer

Match the following terms to their related statements

Question 28

True

Accepted Answer

Shields may be used in combination with benching and shoring

Question 29

Manufacturer

Accepted Answer

Any modifications to shields must be approved by the

Question 30

Once per shift

Accepted Answer

Hydraulic shoring must be checked at least ______ for leaking hoses and/or cylinders, broken connections, cracked nipples, bent bases, or any other damaged or defective parts

Question 31

4

Accepted Answer

Where oxygen deficiency (atmospheres containing less than 19.5% oxygen) exists or could reasonable be expected to exist, the atmospheres in the excavation must be tested before employees enter excavations great than ______ in depth

Question 32

True

Accepted Answer

Cave-ins pose the greatest risk and are much more likely than other excavation-related accidents to result in worker fatalities

Question 33

5 to 15

Accepted Answer

Most accidents occur in trenches _____ feet deep

Question 34

All of the above

Accepted Answer

A condition that contributes to a serious hazard during excavation operations includes

Question 35

False

Accepted Answer

FIre is not considered a hazard associated with excavations

Question 36

True

Accepted Answer

A competent person is capable of identify existing and predictable hazards in surrounding or working conditions that are unsanitary, hazardous, or dangerous to employees, and has authorization to take prompt corrective measures

Question 37

Cave-ins

Accepted Answer

______ are the deadliest excavation hazards

Question 38

False

Accepted Answer

It is permissible to enter an excavation to get a soil sample

Question 39

True

Accepted Answer

Type C soil is the least stable soil

Question 40

Type C

Accepted Answer

What type of soil cannot be benched

Question 41

True

Accepted Answer

The primary types of protective systems are sloping, benching, shoring, and shielding

Question 42

20

Accepted Answer

All excavations over ______ feet in depth must be designed by a registered professional engineer

Question 43

False

Accepted Answer

Protective systems are selected and constructed by the employer, who is free to choose any design, regardless of required performance critieria

Quiz 15 Excavations

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