Mobile Crane Review Exam Questions
with Correct Answers
What is the purpose of placing mats or cribbing under 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 are mounted along operator's can)
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.
Mobile cranes should be level to within what percent of grade? - Answer-1 %
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? - Answer-A. Above compacted fill
B. Above highway asphalt
C. Above underground vaults
D. Above highway concrete
Each outrigger pad and its blocking should be sufficient to support? - 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?
a. right regular lay
b. right alternate lay
c. left regular lay
d. 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.
a. 1/2 inch
b. 1 inch
c. 1 1/2 inch
d. 2 inch - Answer-1/2 inch
Which type of wire rope listed below is installed on most cranes?
a. main hoist line
b. boom hoist line
c. Auxiliary hoist line
d. pendant line - Answer-pendant line
when lifting on outriggers, the floats or pads should always be:
a. sufficient to support three times the applies load
b. raised to touch the tires firmly on the ground
c. secured to the outriggers cylinder
d. secured to the mats - Answer-secured to the outriggers cylinder
on a mobile crane, how many broken wires are permitted at the connection of a pendant
before it must be taken out of service?
a. 6
b. 5
c. 3
d. 1 - Answer-1
How many randomly broken wires in a lay length must there be on a mobile cranes
hoist line, before it should be removed from service?
a. 4
b. 3
, c. 5
d. 6 - Answer-6
what is the minimum design (unless rotation resistant) factor required for a right regular
lay, boom or hoist wire rope?
a. 5
b. 3.5
c. 2.5
d. 7 - Answer-3.5
Type 1 rotation resistant hoist wire rope has a design factor of:
a. 2.5 to 1
b. 3 to 1
c. 3.5 to 1
d. 5 to 1 - Answer-5 to 1
it is important to know when lubricating crane hoist wire rope, that the lubricant must:
a. not hinder visual inspection
b. not be applied in direct sunlight
c. not be applied prior to use
d. not be applied to regular lay wire rope - Answer-not hinder visual inspection
how often is the competent person required to inspect the running wire ropes on a
mobile wire?
a. each shift
b. each year
c. each week
d. each month - Answer-each shift
On mobile cranes, how many broken wires must be present in one strand of one lay for
running wire rope removed from service?
A. 3
B. 1
C. 2
D. 0 - Answer-3
How many randomly distributed broken wires in rotation-resistant hoist wire ropes
considered for replacement?
A. 1 broken wire in 6 rope diameters
B. 2 broken wires in 30 rope diameters
C. 3 broken wires in one strand in one lay
with Correct Answers
What is the purpose of placing mats or cribbing under 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 are mounted along operator's can)
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.
Mobile cranes should be level to within what percent of grade? - Answer-1 %
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? - Answer-A. Above compacted fill
B. Above highway asphalt
C. Above underground vaults
D. Above highway concrete
Each outrigger pad and its blocking should be sufficient to support? - 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?
a. right regular lay
b. right alternate lay
c. left regular lay
d. 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.
a. 1/2 inch
b. 1 inch
c. 1 1/2 inch
d. 2 inch - Answer-1/2 inch
Which type of wire rope listed below is installed on most cranes?
a. main hoist line
b. boom hoist line
c. Auxiliary hoist line
d. pendant line - Answer-pendant line
when lifting on outriggers, the floats or pads should always be:
a. sufficient to support three times the applies load
b. raised to touch the tires firmly on the ground
c. secured to the outriggers cylinder
d. secured to the mats - Answer-secured to the outriggers cylinder
on a mobile crane, how many broken wires are permitted at the connection of a pendant
before it must be taken out of service?
a. 6
b. 5
c. 3
d. 1 - Answer-1
How many randomly broken wires in a lay length must there be on a mobile cranes
hoist line, before it should be removed from service?
a. 4
b. 3
, c. 5
d. 6 - Answer-6
what is the minimum design (unless rotation resistant) factor required for a right regular
lay, boom or hoist wire rope?
a. 5
b. 3.5
c. 2.5
d. 7 - Answer-3.5
Type 1 rotation resistant hoist wire rope has a design factor of:
a. 2.5 to 1
b. 3 to 1
c. 3.5 to 1
d. 5 to 1 - Answer-5 to 1
it is important to know when lubricating crane hoist wire rope, that the lubricant must:
a. not hinder visual inspection
b. not be applied in direct sunlight
c. not be applied prior to use
d. not be applied to regular lay wire rope - Answer-not hinder visual inspection
how often is the competent person required to inspect the running wire ropes on a
mobile wire?
a. each shift
b. each year
c. each week
d. each month - Answer-each shift
On mobile cranes, how many broken wires must be present in one strand of one lay for
running wire rope removed from service?
A. 3
B. 1
C. 2
D. 0 - Answer-3
How many randomly distributed broken wires in rotation-resistant hoist wire ropes
considered for replacement?
A. 1 broken wire in 6 rope diameters
B. 2 broken wires in 30 rope diameters
C. 3 broken wires in one strand in one lay
