Unit 4c - Crane Rigging Exercise

1.

If you are picking something that would result in a choker angle of 40 degrees, how much of the rated capacity can you use?

49%

62%

74%

87%

If the choker angle is 40 degrees, the maximum rated capacity that can be used is 62%. The choker angle refers to the angle formed between the sling leg and the horizontal plane. As the choker angle decreases, the tension on the sling increases, reducing its capacity. At a choker angle of 40 degrees, the rated capacity can be used up to 62% without exceeding the safe working load.

Explanation

If the choker angle is 40 degrees, the maximum rated capacity that can be used is 62%. The choker angle refers to the angle formed between the sling leg and the horizontal plane. As the choker angle decreases, the tension on the sling increases, reducing its capacity. At a choker angle of 40 degrees, the rated capacity can be used up to 62% without exceeding the safe working load.

2.

What would be the most preferred sling angle?

65 degrees

5 degrees

45 degrees

30 degrees

The most preferred sling angle would be 65 degrees because it provides the optimal balance between load stability and load capacity. A sling angle of 65 degrees ensures that the load is evenly distributed across the sling legs, reducing the risk of slippage or failure. This angle also maximizes the load capacity of the sling, allowing for efficient and safe lifting operations.

Explanation

The most preferred sling angle would be 65 degrees because it provides the optimal balance between load stability and load capacity. A sling angle of 65 degrees ensures that the load is evenly distributed across the sling legs, reducing the risk of slippage or failure. This angle also maximizes the load capacity of the sling, allowing for efficient and safe lifting operations.

3.

"17 feet; 8,460Pounds; 172-5/8 inches; 133inches; 30 degree; 13,050 pounds"

"17 feet; 8,700 Pounds; 176-5/8 inches; 124 inches; 35 degree; 13,050 pounds"

"16 feet; 8,700 Pounds; 176-5/8 inches; 124 inches; 35 degree; 13,050 pounds"

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Explanation

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4.

What is the tension or load going into the slings?

"5,780 pounds"

"5,000 Pounds"

"5,465 Pounds"

"5,825 Pounds"

The tension or load going into the slings is 5,780 pounds.

Explanation

The tension or load going into the slings is 5,780 pounds.

5.

If your L is 10 feet and your H is 8 feet what is your Load Factor?

0.8

1.25

1.67

1.22

10 feet x 12 inches = 120 inches divided by 8 feet x 12 inches = 96 inches.
120/96= 1.25

Explanation

10 feet x 12 inches = 120 inches divided by 8 feet x 12 inches = 96 inches.
120/96= 1.25

6.

Calculate the load per sling, sling size, and shackle size.

"25,000 pounds; 1-1/4"" sling; 1-3/8"" shackle"

"25,000 pounds; 1-3/8"" sling; 1-1/2"" shackle"

"12,500 pounds; 1"" sling; 1-1/8"" shackle"

"12,500 pounds 7/8"" sling; 1"" shackle"

The correct answer is "25,000 pounds; 1-1/4" sling; 1-3/8" shackle". This answer is determined by considering the load per sling, sling size, and shackle size. The load per sling is 25,000 pounds, which means that each sling will bear this weight. The sling size is 1-1/4", indicating the diameter of the sling. The shackle size is 1-3/8", referring to the diameter of the shackle. These measurements are important in determining the appropriate equipment for lifting the given load safely and efficiently.

Explanation

The correct answer is "25,000 pounds; 1-1/4" sling; 1-3/8" shackle". This answer is determined by considering the load per sling, sling size, and shackle size. The load per sling is 25,000 pounds, which means that each sling will bear this weight. The sling size is 1-1/4", indicating the diameter of the sling. The shackle size is 1-3/8", referring to the diameter of the shackle. These measurements are important in determining the appropriate equipment for lifting the given load safely and efficiently.

7.

Calculate the load per sling, sling size and shackle size.

"7000, 5/8, 3/4"

"8085, 5/8, 3/4"

"14000, 5/8, 3/4"

"7000, 3/4, 7/8"

"8085, 3/4, 7/8"

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Explanation

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8.

Calculate the share of the load, sling size, and shackle size for A and B. (Select the 2 correct answers.)

"Side A = 2,800; 5,600; 5/8 sling; 3/4 shackle"

"Side A= 7,200; 8,640; 3/4 sling; 7/8 shackle"

"Side B = 7,200; 8,640; 3/4 sling; 7/8 shackle"

"Side B= 2,800; 5,600; 5/8 sling; 3/4 shackle"

The correct answers for this question are "Side A = 2,800; 5,600; 5/8 sling; 3/4 shackle" and "Side B = 7,200; 8,640; 3/4 sling; 7/8 shackle". These answers provide the correct values for the share of the load, sling size, and shackle size for both sides A and B. The given information in the question provides the values for each parameter, and by comparing them, we can determine the correct answers.

Explanation

The correct answers for this question are "Side A = 2,800; 5,600; 5/8 sling; 3/4 shackle" and "Side B = 7,200; 8,640; 3/4 sling; 7/8 shackle". These answers provide the correct values for the share of the load, sling size, and shackle size for both sides A and B. The given information in the question provides the values for each parameter, and by comparing them, we can determine the correct answers.

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9.

Calculate the load per sling, sling size and shackle size for A B and C. (Choose the two correct answers.)

"Side A = 8,484 pounds; 7/8 sling; 1 shackle C = 7/8 shackle"

"Side B = 5,000 pounds; 7/8 sling; 1 shackle C = 7/8 shackle"

"Side A = 8,484 pounds; 3/4 sling; 7/8 shackle C = 7/8 shackle"

"Side B = 5,000 pounds; 3/4 sling; 7/8 shackle C = 7/8 shackle"

The correct answer is "Side A = 8,484 pounds; 3/4 sling; 7/8 shackle C = 7/8 shackle","Side B = 5,000 pounds; 3/4 sling; 7/8 shackle C = 7/8 shackle". This answer is correct because it provides the load per sling, sling size, and shackle size for both Side A and Side B. It states that Side A has a load of 8,484 pounds, a 3/4 sling, and a 7/8 shackle C. Similarly, Side B has a load of 5,000 pounds, a 3/4 sling, and a 7/8 shackle C.

Explanation

The correct answer is "Side A = 8,484 pounds; 3/4 sling; 7/8 shackle C = 7/8 shackle","Side B = 5,000 pounds; 3/4 sling; 7/8 shackle C = 7/8 shackle". This answer is correct because it provides the load per sling, sling size, and shackle size for both Side A and Side B. It states that Side A has a load of 8,484 pounds, a 3/4 sling, and a 7/8 shackle C. Similarly, Side B has a load of 5,000 pounds, a 3/4 sling, and a 7/8 shackle C.

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