Engineering, 15.04.2020 15:51 Nprz84

(Construction Management Fundamental) Civ / Arch E

An excavator ($300/hour) with a 4 cubic yard bucket loads trucks ($200/hour each).Trucks carry 18 cubic yards. Each cycle of the excavator is 30 seconds (4 yd3 each 30

seconds). We can either load the truck full (18 yd3) in 5 cycles or partially full (16 yd3) in 4 cycles. Assume 100% productive (60 minutes/60 minutes)In either case, the truck takes 6.5 minutes to travel, dump and return.

a. Option 1: 5 cycles of the excavator, 18 yd3 in the truck.

i. Determine the number of trucks to balance the operation, to 1 decimal place

ii. Round the number of trucks up, determine the productivity in yd3/hour

iii. Determine the cost per hour (round to nearest dollar) and cost per cubic yard(round to nearest cent/yd3) to load and haul the soil.

b Option 2: 4 cycles of the excavator, 16 yd3 in the truck.

i. Determine the number of trucks to balance the operation, to 2 decimal places

ii. Round the number of trucks up, determine the productivity in yd3/hour

iii. Determine the cost per hour and cost per cubic yard to load and haul the soil

Answers: 3

Show answers

Another question on Engineering

Engineering, 04.07.2019 18:10

Ajournal bearing has a journal diameter of 3.250 in with a unilateral tolerance of 20.003 in. the bushing bore has a diameter of 3.256 in and a unilateral tolerance of 0.004 in. the bushing is 2.8 in long and supports a 700-lbf load. the journal speed is 900 rev/min. find the minimum oil film thickness and the maximum film pressure for both sae 20 and sae 20w-30 lubricants, for the tightest assembly if the operating film temperature is 160°f. a computer code is appropriate for solving this problem.

Answers: 3

Answer

Engineering, 04.07.2019 18:10

Consider a large isothermal enclosure that is maintained at a uniform temperature of 2000 k. calculate the emissive power of the radiation that emerges from a small aperture on the enclosure surface. what is the wavelength ? , below which 10% of the emission is concentrated? what is the wavelength ? 2 above which 10% of the emission is concentrated? determine the wavelength at which maximum spectral emissive power occurs. what is the irradiation incident on a small object placed inside the enclosure?

Answers: 2

Answer

Engineering, 04.07.2019 18:10

Carbon dioxide gas expands isotherm a turbine from 1 mpa, 500 k at 200 kpa. assuming the ideal gas model and neglecting the kinetic and potential energies, determine the change in entropy, heat transfer and work for each kilogram of co2.

Answers: 2

Answer

Engineering, 04.07.2019 18:10

Shafts are machine elements that are used to a) carry axial loads b) direct shear loads c) transmit power d) rotate at constant speed e) none of the above circular and square shafts subjected to the same torque under the same circum behave a) the same way b) almost the same way

Answers: 2

Answer

You know the right answer?

(Construction Management Fundamental) Civ / Arch E

An excavator ($300/hour) with a 4 cub...

Questions