Chapter 21 SCAFFOLDS

The height of a mobile scaffold must not exceed the minimum base dimension by ______ times.

• three

• four

• five

• six

OSHA requires that guardrails be installed on all scaffolds more than ______ feet in height.

• 6

• 10

• 16

• 24

Tubular scaffold end frames should be installed level and plumb to sit on top of ______.

• baseplates

• sills

• cribbing

• all of these

To access the work area of a scaffold, the user should use an approved ladder or ______.

• the ladder built into the end frame

• cross braces

• the horizontal bearing points of the scaffold

• all of these

All scaffolding should be able to support ______ times the intended load.

• four

• five

• ten

• twenty

The vertical members of a pump jack scaffold are called ______.

• columns

• piers

• poles

• uprights

Pump jacks differ from metal tubular scaffolding in that metal tubular scaffolding ______.

• often requires toeboards

• is usually installed on a mud sill

• has braces

• none of these

Roof brackets should be fastened to the roof with ______ nails.

• roofing

• finish

• 12d framing

• duplex

Select the most appropriate answer. 1. The responsibility for safety on a jobsite relies on a. the local OSHA inspector. b. the general contractor. c. scaffold erectors. d. every worker on the job.

• the local OSHA inspector.

• the general contractor.

• scaffold erectors.

• every worker on the job.

Select the most appropriate answer. 2. Bearers of a scaffold system support the

• ledgers.

• planks.

• rails.

• braces.