erection part 2

Question 1

Damage to the rotation gear of a digger derrick can be caused by ?

Answer 1

operating a heavy load with the truck set up on a slope

Question 2

The lifting capacity of a digger derrick is decreased when ?

Answer 2

the boom is extended away from the turret

Question 3

The lifting capacity chart for each digger derrick must be ?

Answer 3

visible from the boom operators position

Question 4

The lifting capacity changes with the direction of the boom in relation to the truck, outriggers, and slope of the ground. A typical chart will show a ? rating when operating the boom over the side and at a 5° slope.

Answer 4

60%

Question 5

The maximum working load for a one-inch double-braided polyester winch rope is ?

Answer 5

6,000lbs

Question 6

To determine the Working Load Limit (WLL) of rigging components, the ? is divided by the safety factor.

Answer 6

breaking strength

Question 7

When the nuts are installed, the bolts should be long enough so that at least ? thread(s) is/are seen protruding through the nut.

Answer 7

2

Question 8

A synthetic web sling has a catalog breaking strength of five tons. Using the typical safety factor for synthetic web slings, determine the WLL.

Answer 8

2,000lbs

Question 9

Sling angle is the angle ?

Answer 9

a sling leg makes with an imaginary horizontal line

Question 10

When rigging a shackle on a hook, to avoid the shackle sliding to one side of the pin and loading one leg, ?

Answer 10

pack the pin with washers to center the shackle.

Question 11

Because of high tensions, sling angles of ? or less are to be avoided.

Answer 11

30 degrees

Question 12

When lifting an object with eyebolts attached, the loading should be applied in the plane of the eye so that the bolts do not bend sideways.

Answer 12

true

Question 13

A winch cable can come off and drop the load being lifted if ? or more wraps are not left on the drum.

Answer 13

2