NCCCO CORE FINAL EXAM WITH 120 QUESTIONS AND
ANSWERS
Complete Questions with Verified Answers
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 90 degree angle between cylinder rod and pad
What is the primary purpose fir a rooster sheave or auxiliary boom point sheave? - ANSWER
Separate the boom hoist lines
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? - ANSWER 6
On a mobile crane, how many broken wires are permitted at the end connection of a pendent
before it must be taken out of service? - ANSWER 1
Type 1 rotation resistant hoist wire rope has a design factor of: - ANSWER 5 to 1
How many randomly distributed broken wires in rotation- resistant hoist wire rope are
considered for replacement? - ANSWER 2 broken wires in 6 rope diameters
The term net capacity is best defined by which of the terms listed below? - ANSWER Gross
capacity minus capacity deductions
Mobile cranes that are set up on barges, shall have a list chart provided by which of the
entities listed below? - ANSWER Manufacturer
When lifting loads on tires, mobile cranes are rated at what percentage of tipping? - ANSWER
75%
How does the effective weight of a slowed extension relate to the actual weight of the
extension? - ANSWER Higher than the actual weight.
When load radius is between radii values, the operator must use the: - ANSWER longer
radius
Why should only approved attachments or extra counterweights provided by the
manufacturer be placed on the rear of the crane? - ANSWER They could cause a backward
stability problem.
, A mobile crane's jib is offset 15º versus its original 0º offset, but the boom angle remains
unchanged. In this situation, the load radius: - ANSWER increases
Abruptly stopping a rapid swing on a long-boom mobile crane will produce what major effect?
- ANSWER Collapsing the boom.
When determining the position to a mobile crane should be left in over night, when high
winds in the forecast the operator should: - ANSWER Follow the manufacturers
recommendations.
If a mobile crane is NOT set-up level and the operator swings the load from the high side to
the low side, what effect will that have on the radius? - ANSWER The radius increase.
Increasing the distance from the crane's center of gravity to the tipping axis will have what
effect on the mobile crane? - ANSWER Decreases stability.
Backward stability of a mobile crane is tested in which configuration listed below? - ANSWER
Basic boom at minimum angle with no load
Deflection of the boom while operating a mobile crane will increase? - ANSWER Load Radius
(Swings out)
A sudden start or stop of the hoisting function while operating a mobile crane can produce a: -
ANSWER dynamic load
Before lifting an occupied personnel platform on a job site, which of the following applies? -
ANSWER Use 50% of rated capacity, Trial lift to anticipated weight, Ensure rigging dedicated
to platform only.
According to OSHA 1926. 1431, while hoisting a personnel platform, what weather condition
listed below will promptly discontinue the operation? - ANSWER Dangerous
If working near overhead power line and using a tag line, which type of rope is least
conductive to electricity? - ANSWER Polypropylene
When working near power lines with the mobile crane, where does OSHA require caution
stickers be installed on all equipment? - ANSWER At operators station and 2 on the outside
of the equipment.
According to OSHA table T, what is the minimum clearance for 133kV power lines? - ANSWER
10ft
According to OSHA's table T, what clearance should a mobile crane IN TRANSIT keep while
going under 445kV lines? - ANSWER 16ft
ANSWERS
Complete Questions with Verified Answers
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 90 degree angle between cylinder rod and pad
What is the primary purpose fir a rooster sheave or auxiliary boom point sheave? - ANSWER
Separate the boom hoist lines
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? - ANSWER 6
On a mobile crane, how many broken wires are permitted at the end connection of a pendent
before it must be taken out of service? - ANSWER 1
Type 1 rotation resistant hoist wire rope has a design factor of: - ANSWER 5 to 1
How many randomly distributed broken wires in rotation- resistant hoist wire rope are
considered for replacement? - ANSWER 2 broken wires in 6 rope diameters
The term net capacity is best defined by which of the terms listed below? - ANSWER Gross
capacity minus capacity deductions
Mobile cranes that are set up on barges, shall have a list chart provided by which of the
entities listed below? - ANSWER Manufacturer
When lifting loads on tires, mobile cranes are rated at what percentage of tipping? - ANSWER
75%
How does the effective weight of a slowed extension relate to the actual weight of the
extension? - ANSWER Higher than the actual weight.
When load radius is between radii values, the operator must use the: - ANSWER longer
radius
Why should only approved attachments or extra counterweights provided by the
manufacturer be placed on the rear of the crane? - ANSWER They could cause a backward
stability problem.
, A mobile crane's jib is offset 15º versus its original 0º offset, but the boom angle remains
unchanged. In this situation, the load radius: - ANSWER increases
Abruptly stopping a rapid swing on a long-boom mobile crane will produce what major effect?
- ANSWER Collapsing the boom.
When determining the position to a mobile crane should be left in over night, when high
winds in the forecast the operator should: - ANSWER Follow the manufacturers
recommendations.
If a mobile crane is NOT set-up level and the operator swings the load from the high side to
the low side, what effect will that have on the radius? - ANSWER The radius increase.
Increasing the distance from the crane's center of gravity to the tipping axis will have what
effect on the mobile crane? - ANSWER Decreases stability.
Backward stability of a mobile crane is tested in which configuration listed below? - ANSWER
Basic boom at minimum angle with no load
Deflection of the boom while operating a mobile crane will increase? - ANSWER Load Radius
(Swings out)
A sudden start or stop of the hoisting function while operating a mobile crane can produce a: -
ANSWER dynamic load
Before lifting an occupied personnel platform on a job site, which of the following applies? -
ANSWER Use 50% of rated capacity, Trial lift to anticipated weight, Ensure rigging dedicated
to platform only.
According to OSHA 1926. 1431, while hoisting a personnel platform, what weather condition
listed below will promptly discontinue the operation? - ANSWER Dangerous
If working near overhead power line and using a tag line, which type of rope is least
conductive to electricity? - ANSWER Polypropylene
When working near power lines with the mobile crane, where does OSHA require caution
stickers be installed on all equipment? - ANSWER At operators station and 2 on the outside
of the equipment.
According to OSHA table T, what is the minimum clearance for 133kV power lines? - ANSWER
10ft
According to OSHA's table T, what clearance should a mobile crane IN TRANSIT keep while
going under 445kV lines? - ANSWER 16ft
