Cranes

Front 1

List at least 4 of the basic operational characteristics of all mobile cranes.

Back 1

1. Adjustable boom lengths

2. Adjustable boom angles

3. Ability to lift and lower loads

4. Ability to swing loads

5. Ability to travel about the job site under their own power

Front 2

List at least seven of the basic types and configurations that have evolved within the broad category of mobile cranes.

Back 2

1. Boom trucks

2. Industrial cranes

3. Carrier- mounted lattice boom cranes

4. Crawler- mounted lattice boom cranes

5. Carrier- mounted telescopic boom cranes

6. Crawler- mounted telescopic boom cranes

7. Rough terrain cranes

8. Mobile tower cranes

9. Heavy- lift mobile cranes

10. Overhead cranes

Front 3

Back 3

Memorize

Front 4

The characteristics of industrial cranes are basically identical to those of ________ boom mobile cranes.

Back 4

Telescopic

Front 5

Industrial cranes have _______ centers of gravity to permit operation in narrow aisles or runways without outriggers.

Back 5

Low

Front 6

Give at least 2 names by which carrier mounted cranes are commonly called.

Back 6

1. Truck cranes

2. Conventional cranes

3. Friction cranes

4. Mobile cranes

Front 7

The entire rotating crane strucure that lies above the swing circle is the_______ of the crane.

Back 7

Upperworks

Front 8

Back 8

Memorize

Front 9

Midpoint (intermediate) suspension is necessary when raising very long booms off the ground because it prevents the boom from _______ excessively.

Back 9

Sagging

Front 10

The square frame at each end of a boom insert is commonly referred to as the ______ ______.

Back 10

Picture frame

Front 11

Except for their base and method of load rating, the upperworks of crawler- mounted lattice boom cranes are identical to those of ______

mounted units.

Back 11

Carrier

Front 12

Carrier mounted telescopic boom cranes can be equipped with a variety of jibs and boom extensions, which can be stowed on or under the _______ section of the main boom.

Back 12

Heel

Front 13

When a luffing jib is raised or lowered independently of the boom, what is used as the jib hoist?

Back 13

The crane's auxiliary winch

Front 14

Carrier mounted telescopic boom cranes are subdivided by the type of _________ or________with which they are equipped.

Back 14

Head section or boom tip section

Front 15

On pinned booms, the end section is either fully _______ or fully _______ at all times.

Back 15

Retracted or extended

Front 16

Although the bases and the method used to load rate them differ, the upperworks of crawler mounted telescopic boom cranes are identical to the ________ mounted units.

Back 16

Carrier

Front 17

What is found on rough terrain cranes that facilitate movement across the rough terrain of construction sites and other broken ground?

Back 17

Oversized tires

Front 18

Rough terrain units are available with 2 basic configurations : fixed cab and ______ cab

Back 18

Rotating

Front 19

Some manufacturers of carrier mounted lattice boom cranes offer optional ______ attachments for their machines.

Back 19

Tower

Front 20

What do heavy lift mobile cranes use to keep the crane from tipping?

Back 20

Very large extended counter weights, masts, and often roller wings that move the booms fulcrum and tipping axis further away from the center of gravity

Front 21

Which basic unit of the overhead crane is used to span the width of the runway area?

Back 21

The bridge

Front 22

Which basic unit of the overhead crane travels along the rails fastened to the bridge girders and supports the hoist and trolley mechanism?

Back 22

The trolley

Front 23

On overhead cranes, the _______ unit is an apparatus that exerts a force for lifting or lowering.

Back 23

Hoist