Lattice Boom: March 12, 2023

Question 1

On lattice boom cranes with power load lowering mounted on the hoist, a heavy load should be lowered by using which functions listed below

Answer 1

Power load lowering feature
and the foot brake

Question 2

a pin connected lattice boom is being dismantled. After connecting the equalizer (bridle) to the connecting lugs on the boom butt. which boom connecting pins should be removed first

Answer 2

lower connection pins,
located at and ahead of the equalizer

Question 3

when using a mobile crane on a barge, the crane’s load capacity ratings will be

Answer 3

replaced by a list chart

Question 4

How many broken wires are permitted at the end connection of a standing pendant line before it must be taken out of service

Answer 4

1

Question 5

When assembling a lattice boom on most mobile cranes and using inserts of different lengths, which insert section generally should be closest to the boom butt section

Answer 5

10 ft

Question 6

Backward stability of a mobile crane is tested in which configuration

Answer 6

basic boom
at maximum angle
with no load

Question 7

the device that automatically stops the boom when it nears the cranes maximum angle is called the

Answer 7

boom hoist limiting device

Question 8

What does the term “jib offset” mean when refferring to a lattice boom mobile crane

Answer 8

jib angle to boom

Question 9

Manufacturer specifications permit only a certain amount of lattice boom to be suspended out past the connection point of the pendants during assembly or disassembly of the boom. The term for that length of boom that is suspended is called the

Answer 9

cantilever length

Question 10

On the majority of friction style mobile cranes the power is transferred to the torque converter by which component

Answer 10

Master clutch

Question 11

When lattice boom is being disassembled or shortened, it is extremely important to:

Answer 11

never touch any pin on boom section

between the pendant attachment points

And crane

Question 12

When swinging a suspended load on any lattice boom crane, the most ground pressure will be exerted over which position

Answer 12

Corner

Question 13

On a lattice boom truck crane, the main boom length is measured from the:

Answer 13

center of the heel pins
to the center of the tip sheave pins

Question 14

How should the gantry of a lattice boom crane be positioned when hoisting a suspended load?

Answer 14

Highest position

Question 15

When assembling or disassembling lattice booms, when is it safe to work under the boom

Answer 15

None of the above

Question 16

When handling boom sections, where is the best location for slings to be attached”

Answer 16

pin connection points
at the end of the top chords

Question 17

Booms that are being assembled or disassembled on the ground with or without support of the boom harness should be

Answer 17

securely blocked
to prevent dropping of the boom and boom sections

Question 18

When installing boom pins on lattice boom cranes, which direction should the connection pins be pointing?

Answer 18

outward and away from center

Question 19

A hydraulic lattice boom crane is equipped with an anti two block lockout device. When the device is activated which functions should be disabled

Answer 19

hoist and boom down

Question 20

According to OSHA, when is it safe to hoist loads with a lattice boom crane below energized power lines.

Answer 20

The boom is kept 10 ft away from the power line for 360 degrees

Question 21

A crane loses stability when its leverage on the load is:

Answer 21

less than the load’s leverage on the crane

Question 22

What is the design factor required when using rotation resistant wire rope slings and lifting personnel in a platform suspended from a mobile crane

Answer 22

3.5

Question 23

A mobile crane’s jib is offset at 15 degrees versus the original 30 degree offset, but the boom angle remains unchanged. In this situation, the load radius would:

Answer 23

increase

Question 24

On mobile cranes, what information does the boom angle indicator display to the operator

Answer 24

angle of boom to vertical

Question 25

What boom position produces the least amount of ground pressure on a lattice boom crawler crane

Answer 25

side

Question 26

What should the operator do if he or she cannot properly level the crane?

Answer 26

don’t operate the crane

Question 27

What effect does having the crawlers retracted have on a mobile crawler crane with a long boom

Answer 27

Decrease in capacity

Question 28

A mobile crawler crane is on a barge, what item listed below is important to check

Answer 28

Crane is secured to the barge

Question 29

When operating a lattice boom crawler crane what is the least stable allowable quadrant of operation

Answer 29

Front

Question 30

Tipping capacities of lattice boom crawler cranes are based on what percentage of tipping

Answer 30

75%

Question 31

Approved blocking placed under the tips of the tracks on some mobile crawler cranes will;

Answer 31

increase a crane’s stability

Question 32

The tipping axis over the side on most lattice boom crawler cranes is generally inline with what component?

Answer 32

Track rollers