AIC Tools & Equipment Operation 2

Question 1

As a rule of thumb, how much grade resistance does each 1% of adverse grade add for a haul unit?

Accepted Answer

20 lb per ton of gross weight

Answer

Each 1% of uphill grade adds about 20 lb of resistance per ton of gross vehicle weight.

Question 2

A haul road has a 3% uphill grade and a rolling resistance of 60 lb/ton. What is the effective grade?

Accepted Answer

6%

Answer

60 lb/ton ÷ 20 lb/ton per % = 3%, plus the 3% grade, gives an effective grade of 6%.

Question 3

An excavation yields 100 bank cubic yards of soil with a 25% swell factor. How many loose cubic yards must be hauled?

Accepted Answer

125 LCY

Answer

Loose volume = bank volume × (1 + swell) = 100 × 1.25 = 125 LCY.

Question 4

Which of the following is classified as an operating cost rather than an ownership cost for construction equipment?

Accepted Answer

Fuel

Answer

Fuel is used only while the machine runs, so it is an operating cost; depreciation, insurance, and taxes are ownership costs.

Question 5

A loader costs $200,000 with an estimated $20,000 salvage value and a 5-year life. What is the annual straight-line depreciation?

Accepted Answer

$36,000

Answer

($200,000 − $20,000) ÷ 5 years = $36,000 per year.

AIC - American Institute of Constructors Certification Practice Test