MOBILE CRANE EXAM PREP QUESTIONS AND

• | P a g e

MOBILE CRANE EXAM PREP QUESTIONS AND

VERIFIED ANSWERS| 100% CORRECT

• What is the purpose of placing mats or cribbing under

outrigger floats?

- ANSWER: Distribute the force over a larger area

• Where is the best location for leveling a crane?

- ANSWER: Upperworks (A revolving frame of equipment on

which operating machinery is mounted along with the operator’s cab)

• Before leveling a mobile crane on outriggers, an operator

should ensure:

- ANSWER: There is no weight of the crane bearing on any

tires

• Operating a mobile crane with a long boom, on uneven

ground, what support condition should be considered?

- ANSWER: Keeping a 90-degree angle between cylinder rod

and pad

• When may blocking (cribbing) be placed under outrigger

beams on mobile cranes?

- ANSWER: Never approved

• | P a g e

• Mobile cranes should be level to within what percent of

grade?

- ANSWER: 1%

7. Timber crane mats work best when they are:

- ANSWER: Bolted together

• When arriving in the crane at the job site, the operator should

first determine the condition of the:

- ANSWER: Access roads

• What surface listed below would NOT be a good location for

assembly or setup of a mobile crane?

• Above compacted fill
• Above highway asphalt
• Above underground vaults
• Above highway concrete

- ANSWER: C. Above underground vaults (Unstable due to

potential collapse risk)

• Each outrigger pad and its blocking should be sufficient to

support?

• | P a g e

- ANSWER: The total weight of the crane and its load

• How does high wind affect a mobile crane with a long

boom?

- ANSWER: Introduces side load onto the boom

• When is the only time the outrigger beams should be less

than fully extended?

- ANSWER: The load chart indicates that this is allowed

(always make sure that it is safe first)

• What is the primary purpose for a rooster sheave or auxiliary

boom point sheave?

- ANSWER: Separate the load hoist lines

• Eccentric main boom tip reeving causes which of the

following:

- ANSWER: Twisting of the main boom

• Which type of wire rope listed below is installed on MOST

cranes?

• right regular lay
• right alternate lay

• | P a g e

• left regular lay
• left alternate lay

- ANSWER: a. right regular lay

• The hoist drum flange shall extend a minimum of _______

over the top layer of wire rope at all times while crane is in operation.

• 1/2 inch
• 1 inch
• 1 1/2 inch
• 2 inch

- ANSWER: a. 1/2 inch (Per ASME B30.5)

• Which type of wire rope listed below is installed on most

cranes?

• main hoist line
• boom hoist line
• auxiliary hoist line
• pendant line

- ANSWER: d. pendant line (Commonly used for static

support, though context may vary)