1) A hydraulic shovel with a bottom-dump bucket with a heaped bucket volume of 10 m³ is excavating tough clay. The swing angle is 103 degrees and the job efficiency is 0.85 + (8/100). Calculate the shovel production in BCM.

2) Estimate the time required to load 408 m³ of gravel from a stockpile into trucks using a clamshell having a heaped bucket capacity of 0.57 m³. Estimated cycle time is 20s. Swing depth factor = 1.0. Job efficiency is estimated to be 58 min/h.

3) A small hydraulic excavator will be used to dig a trench in hard clay. The trench size is 0.76 m wide by 1.50 + (58/100) m deep. The excavator bucket available is 0.76 m wide and has a heaped capacity of 0.50 + (8/100) m³. The maximum digging depth of the excavator is 4.90 m. The average swing angle is expected to be 75° and the job efficiency is 78 %.  Estimate the hourly trench production in BCM and in linear meters of trench.

Reducing the water footprint is a universal goal to be accomplished, how this can be done in Oman?

discuss and describe the particle electrical charge theory with emphasis on electrical double layer theory and its significance during the design of water treatment coagulation unit?

A road of formation width 12 m is to be constructed with side slopes of 1 vertical to 2 horizontal in cut and 1 vertical to 3 horizontal in fill. The existing ground surface has a cross fall of 1 vertical to 8 horizontal and it will intersect the formation 1.5 m to the left of the center line and 1.0 m to the right of the center line at two cross sections 20 m apart. Calculate the areas related to the cut and fill at the two sections. Hence calculate the outstanding volume of cut or fill remaining after the establishment of the formation between the two sections.

If wastewater recirculation rates are too high ---------------

solids will wash out of the secondary clarifier

effluent will be sparkling clean

the treatment efficiency will be high

it all depends on the pH

we don't know what will happen

The concentration of --------------- formed from continuous running of motor vehicle in a closed garage can cause asphyxiation

carbon dioxide

carbon monoxide

carbonate

NH4

none

The valves that are normally located on the upstream side of pumping equipment and at the beginning of each rise in the pipelines to prevent backflow are called -------------- valves.

gate

air-release

check

surge

globe

1. Consider a residential building with 5 floors with two homes at every flat each having 3 m height. You want to design such a piping system that provides the same mass flow rate to all floors with same outlet pressure. Come up with such a piping system that uses only one pump for the whole installment. Draw your system, make your assumptions, and show your results with a case study. (Hint: Minor losses may help! You may check pipe sizes and city water pressures trough internet sources)

2. Imagine a contractor engages an architect to design a house and the architect engages an engineer to complete the drawing: Does the engineer owe any duty to the contractor? why?

Analyse how the use of a weather radar with a correct radar measurement can provide early warning and save life for a frequently severely flooded area

Design the numbers of reinforcing bars required for negative and positive moment that can be utilized for an overhanging beam with service loads (DL + LL) excluding weight of the beam 40 kN/m loading. The distance separating the supports hinge and roller is 7.20 m while from the roller to the free end is 1.8 m. The given dimensions for the beam are breadth b = 300 mm and depth d = 550 mm. The strengths of the concrete and steel are fc' = 20.70 Mpa, and fs = 138 Mpa, respectively. The overhang is only on one side.

timber construction industry challenges

For a position vector d=(-7.1i+-0.1j)m, determine the x-component of the unit vector.

For a position vector d=(-7.1i+-0.1j)m, determine the y-component of the unit vector.

The direction of a 454.7 lb force is defined by the unit vector u₁=cos(30°)i+sin(30°)j. Determine the x-component of the force vector.

Q3. A multistorey building is constructed in Al Seeb near old Muscat international airport. All the structural work like (foundations, beams, columns, slabs and walls) of the building was completed. Now they want to start the exterior work like (plastering and painting of the whole building) to complete the building.   

a. Write any four type of scaffolding suitable for the above construction.   

b. Explain briefly the four types of scaffolding mentioned in the above question with neat sketch and label its parts.

c. How to set the complete procedure of the scaffolding for the multistoried building?

d. Write any three points about the advantages of steel scaffolding over the timber scaffolding

Please paraphrase or rewrite me this text.
please do not use paraphrasing or rewriting tool

The effect of internal curing in the compressive strength depends on the specific
mixture proportions, curing conditions and testing age. (Bentz et al., 2011 pp. 31)

Use of the LWA will decrease the compressive strength of the concrete in the beginning
of its age. That is expected because the specific gravity of the LWA is lower, therefore
leading to lower strength compared to concrete with normal weight aggregate. Previous
studies have shown though, that the long-term compressive strength will increase when
internal curing is used, so it is likely that concrete with LWA has a higher long-term
compressive strength than concrete with normal weight aggregate. (Kerby, 2010 pp. 10)

Although the internal curing might improve the strength of the paste by providing
additional water to the hydration process, the weakening effect by the weaker and softer
aggregate can affect more to the overall behaviour, reducing the strength. (Schlitter et
al., 2010 pp. 139)