Civil Engg Construction Questions

USQStudyDesk: My home > My courses > Fac of Hlth, Eng & Sciences > 2015 Semester 1 > CIV2605_2015_1 > Course and Assessment Information > ONLINE QUIZ 1

Question 1 Not yet answered

Marked out of

10.00

Flag question

Construction Engineering

(10 marks)

For the Komatsu HD325-7 off-highway truck shown in the table below calculate the gross truck mass (kg) when loaded to heaped capacity with material having the following properties:

Bank density = 1750 kg/m

Swell = 41 %

Please round your answer to the nearest kilogram and enter the number only (do not include the unit or any spaces or commas).

3

Information

Flag question

(Source: Komatsu HD325–7 brochure, page 10)

Answer:

The next 6 questions refer to the following data for a particular model of scraper:

Scraper tare (empty) 71000 kg

Average load carried 32 m

Density of material, in bank 1600 kg/ m

3

3

Question 2 Not yet answered

Marked out of

10.00

Flag question

Question 3 Not yet answered

Marked out of

10.00

Flag question

Question 4 Not yet answered

Marked out of

10.00

Flag question

Load factor I 0.65

Distribution of load to driving wheels (% of gross weight) 55 %

Uphill grade on haul road, loaded 4 %

Traction coefficient, haul road 0.59

Rolling resistance, loaded 42 kg/t

Average speed, haul 15 km/hr

Haul distance 1020 m

Average speed, return empty 35 km/hr

Return distance (by different route) 1130 m

Efficiency factor (operator and scraper together) 43 min/hr

Fixed time is made up of:

Spot time 0.8 min

Load time 2.3 min

Dump time 1.4 min

(10 marks)

Calculate the gross scraper mass (kg).

Please provide your answer in kg with a number only (do not include the unit or any spaces or commas).

Answer:

(10 marks)

Calculate maximum tractive force (kN) on road at driving wheels when loaded.

Please provide your answer in kN with a number only (do not include the unit or any spaces or commas).

Answer:

(10 marks)

Calculate the effective grade % on the haul road.

Please provide your answer to one decimal place and enter a number only (do not include the % or any spaces or commas).

Question 5 Not yet answered

Marked out of

10.00

Flag question

Question 6 Not yet answered

Marked out of

10.00

Flag question

Question 7 Not yet answered

Marked out of

10.00

Flag question

Question 8 Not yet answered

Marked out of

10.00

Flag question

Answer:

(10 marks)

Calculate total resistance (kg) while hauling.

Please provide your answer in kg with a number only (do not include the unit or any spaces or commas).

Answer:

(10 marks)

Calculate the total cycle time (minutes).

Please provide your answer in minutes to one decimal place and enter a number only (do not include the unit or any spaces or commas).

Answer:

(10 marks)

Calculate production rate, in Bank m /hr.

Please provide your answer in Bank m /hr with a number only (do not include the unit or any spaces or commas).

Answer:

(10 marks)

Data for the Push-Pull scraper model 637G from the Caterpillar performance handbook, edition 41 has been reproduced for you below. Using these data tables and charts estimate the scraper’s likely production (Bank m /hr) given the following conditions:

The scraper is being struck loaded. Rolling resistance = 40 kg/t Operating conditions are average Efficiency of the driver and machine is 42 min/hr Soil density in bank = 1800 kg/m Soil density loose = 1580 kg/m Total fixed time = 1.5 minutes

You should assume that the scraper is moving at a slow speed when entering and leaving the loading and unloading areas.

3

3

3

3

3

Use the reference tables given in your study material where appropriate.

The scraper is working on a route comprising the following sections:

Section Description Length (m)

1 Level turnaround and loading zone (spotting and loading)

2 Haul road, 10% down grade 500

3 Haul road, 1% down grade 250

4 Level unloading area (manoeuvre and dumping)

5 Return road, 12% up grade 400

6 Return road – level section 600

Question 9 Not yet answered

Marked out of

5.00

Flag question

Please provide your answer in Bank m /hr with a number only (do not include the unit or any spaces or commas).

Answer:

(5 marks)

A single drum roller is to be used to compact the material hauled by scrapers to a fill site. The roller and compaction situation have the following characteristics:

Drum width of roller is 1690 mm Operating speed of roller during compaction 4.5 km/hr Compacted thickness of one layer after required number of passes 150 mm

3

Question 10 Not yet answered

Marked out of

10.00

Flag question

Question 11 Not yet answered

Marked out of

5.00

Flag question

Number of passes required to achieve desired compaction 5 Combined efficiency of roller and operator 42 minutes/hour Shrinkage factor of material 0.7

Calculate production rate of the roller in Bank m /hr.

Please provide your answer in Bank m /hr with a number only (do not include the unit or any spaces or commas).

Answer:

(10 marks)

An 170 m long 100 mm diameter compressed air pipeline is to be run from a stationary compressor to an air-track drill which requires a flow of 780 l/sec. The pipeline contains 2 large radius bends (R=2d) ,and 2 half closed gate valves.

Calculate the loss of pressure which will occur in the pipeline from the compressor to the drill. Assume leakage losses are zero.

Please round your answer to the nearest kPa and enter the number only (do not include the unit or any spaces or commas).

Answer:

(5 marks)

An air-track drill is rated as requiring 600 l/sec of compressed air at sea level.

What flow needs to be provided by the compressor if the air-track drill is to operate at an elevation of 900 m?

Please round your answer to the nearest l/sec and enter the number only (do not include the unit or any spaces or commas).

Answer:

Next

You are logged in as Zainab H S H S A A Alsayed Ebrahim (Log out) CIV2605_2015_1

3

3

Twitter

Facebook

Youtube

LinkedIn

Pinterest

WordPress

Instagram

Google+

ABN: 40 234 732 081 | CRICOS: QLD 00244B, NSW 02225M | TEQSA: PRV12081 | Right to Information | Disclaimer |

Privacy | Feedback | Contact us

© University of Southern Queensland | USQ is a member of the Regional Universities Network