Mobile Cranes No. 1 UPDATED ACTUAL
Exam Questions and CORRECT Answers
The load radius as shown on the capacity chart is the distance from the center of rotation to the
centerline of the vertical host line with: - CORRECT ANSWER The rated load suspended.
If the jib angle to ground is changed from 50 degrees to 40 degrees, this would affect the
capacity of the crane how? - CORRECT ANSWER Capacity will decrease.
Load capacity charts are based on 75% of tipping for crawler cranes without out riggers. For
wheel mounted cranes, using outriggers fully extended, capacities are based on what percentage
of tipping? - CORRECT ANSWER 85%
The operators should exercise extreme caution when lifting loads from the water mainly because:
- CORRECT ANSWER The load on the crane will increase as an object leaves the water.
On the upper works - CORRECT ANSWER On the carrier.
When working on soft soil with poor bearing support: - CORRECT ANSWER Use
matting to distribute crane's weight over a larger area.
The best way to determine the weight of a load to be lifted is to: - CORRECT
ANSWER Have a certified load weight and add in the weight of all rigging.
When a situation arises that will not permit outriggers to be set at positions that correspond to the
locations established by the manufacturer's load rating charts, the crane manufacturer shall be
consulted to determine if any capacity reductions, special operation procedures, or limitations are
required. If required information is not available from the manufacturer, whom shall be
consulted? - CORRECT ANSWER Qualified person.
When performing a pick and carry operation using a crawler crane, the load should be
positioned: - CORRECT ANSWER Over the front.
, A thick dark line running across the load chart means that the load listings: - CORRECT
ANSWER Above the lines are limited by structural factors.
Dynamic motion such as swinging with a load can cause what change in the crane operation? -
CORRECT ANSWER Increased load radius.
The dead end of the wire rope above the wedge socket must extend a minimum of 6 times the
rope diameter or: - CORRECT ANSWER 6 inches.
A work area chart is used to: - CORRECT ANSWER Identify capacity changes due to
operational quadrants.
Which of the following 3 sling hitches is listed in order from the strongest to the weakest? -
CORRECT ANSWER Basket, Vertical, Chocker.
An anti-2-block damage of prevention system will: - CORRECT ANSWER Prevent any
crane movements that will cause a 2-block condition.
The minimum distance for safety between the swing radius of the counter weight and any
obstacle is: - CORRECT ANSWER 2 Feet.
What is the best source of information for determining boom tip height? - CORRECT
ANSWER Working range diagram
Attachments or extra counter weights not approved by the manufacturer should not be attached
to the rear of the crane because: - CORRECT ANSWER They may cause a backward
stability problem.
The first thing an operator should do before traveling under a low pipe rack is: - CORRECT
ANSWER Post a signal person to check clearance.
Exam Questions and CORRECT Answers
The load radius as shown on the capacity chart is the distance from the center of rotation to the
centerline of the vertical host line with: - CORRECT ANSWER The rated load suspended.
If the jib angle to ground is changed from 50 degrees to 40 degrees, this would affect the
capacity of the crane how? - CORRECT ANSWER Capacity will decrease.
Load capacity charts are based on 75% of tipping for crawler cranes without out riggers. For
wheel mounted cranes, using outriggers fully extended, capacities are based on what percentage
of tipping? - CORRECT ANSWER 85%
The operators should exercise extreme caution when lifting loads from the water mainly because:
- CORRECT ANSWER The load on the crane will increase as an object leaves the water.
On the upper works - CORRECT ANSWER On the carrier.
When working on soft soil with poor bearing support: - CORRECT ANSWER Use
matting to distribute crane's weight over a larger area.
The best way to determine the weight of a load to be lifted is to: - CORRECT
ANSWER Have a certified load weight and add in the weight of all rigging.
When a situation arises that will not permit outriggers to be set at positions that correspond to the
locations established by the manufacturer's load rating charts, the crane manufacturer shall be
consulted to determine if any capacity reductions, special operation procedures, or limitations are
required. If required information is not available from the manufacturer, whom shall be
consulted? - CORRECT ANSWER Qualified person.
When performing a pick and carry operation using a crawler crane, the load should be
positioned: - CORRECT ANSWER Over the front.
, A thick dark line running across the load chart means that the load listings: - CORRECT
ANSWER Above the lines are limited by structural factors.
Dynamic motion such as swinging with a load can cause what change in the crane operation? -
CORRECT ANSWER Increased load radius.
The dead end of the wire rope above the wedge socket must extend a minimum of 6 times the
rope diameter or: - CORRECT ANSWER 6 inches.
A work area chart is used to: - CORRECT ANSWER Identify capacity changes due to
operational quadrants.
Which of the following 3 sling hitches is listed in order from the strongest to the weakest? -
CORRECT ANSWER Basket, Vertical, Chocker.
An anti-2-block damage of prevention system will: - CORRECT ANSWER Prevent any
crane movements that will cause a 2-block condition.
The minimum distance for safety between the swing radius of the counter weight and any
obstacle is: - CORRECT ANSWER 2 Feet.
What is the best source of information for determining boom tip height? - CORRECT
ANSWER Working range diagram
Attachments or extra counter weights not approved by the manufacturer should not be attached
to the rear of the crane because: - CORRECT ANSWER They may cause a backward
stability problem.
The first thing an operator should do before traveling under a low pipe rack is: - CORRECT
ANSWER Post a signal person to check clearance.
