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Posted By: aravindsri Member Level: Gold Posted Date: 02 Jun 2008
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2006 Indira Gandhi National Open University (IGNOU) B.Tech Civil Engineering ET581F Financial-Management December 2006 Question paper
IGNOU ET581F Financial-Management December 2006
Bachelor of Technology - Civil (Construction Management) (BTCM)
Bachelor of Technology - Civil (Water Resources Engineering) (BTWRE)
Term-End Examination
ET581F Mechanical Equiptment in Construction
Time: 3 hours
Maximum Marks: 100
Note:
(i) Attempt any seven questions.
(ii) All questions carry equal marks
(iii) Use of calculator is allowed.
1. (a) What are the various costs consid ered in evaluating the economic life of an equipment?
(b) What effects do depth of cut and angle of swing have on the output of draglines? How do the size of bucket and the length of boom affect the output of dragline? (2x5=10)
2. (a) How are bucket excavators classified? How is the theoretical output of a bucket excarator assessed?
(b) What is a grid roller and for what type of soil is it best suited ? (2x5=10)
3. (a) How is mass concrete defined? What are the normal construction practices to lower the placement temperafure of concrete?
(b) Why do you require delay detonators? Where are delay detonators used? What are electric detonators ? How are they advantageous over other types of detonators? (2x5=10)
4 (a) Describe the mechanism of a scraper and its operation. Under what soil and valley conditions is the use of a scraper justified?
(b) Describe the different types of dumpers used on construction jobs. How are dumpers different from trucks? (2x5=10)
5. (a) Discuss the radial gates provided on spilways.
(b) What is the purpose of using concrete vibrator? Describe the different types of concrete vibrators. (2x5=10)
6. A batch of concrete mix for mass concrete includes the following ingredients:
Ingradients Batch Weight (kg) Specific heat Initial temperature °C
Cement 95 0.28 44.00
Sand 355 0.25 26.00
Gravel 1673 0.23 4.00
Water 38 1.00 2.00
Free rnoisture in sand 10.60 1.00 26.00
Free moisture in gravel 17 1.00 4.00
Ice ? 0.50 -4.00
If the desired temperature for placement is 10° C, what should be the quantity of ice to be added to the batch ? Assume 3° C rise due to mixing operations. (10)
7. A construction machine costs Rs. 96,000 and has an expected life of 6 years and salvage value of Rs. 6,000. It is expected to work 2500 hours in a year. Compute the yearly depreciation for the rnachine using
(i) Straight line, and
(ii) Sum of the years' digit method (10)
8. Determine the quantity of rnaterial compacted if the sheep's foot roller travels at 6 km/hr, time of rolling is 50 minutes, length of drum 4.0 m, number of drums 2, fraction of overlap 1/5, layer thickness 0.5 m, and the number of passes given are 10. (10)
9. A 2.4m3 re-handling type bucket is used to transfer sand from a stockpile into a hopper 12 m above the ground. The angle of swing is 90°, The average speed of hoist line is 3'2 km/hr. Determine the probable output per hour. (10)
Assume : Time per cycle (Approx.)
Loading bucket : 10.0 sec.
Dumping bucket : 10.0 sec.
Swinging bucket to stqckpile : 7.0 sec.
Loss time, accelerating etc. = 7.5 sec.
Unit operates : 50 minutes per hour
10. Write short notes on any fiueof the following : (5x2=10)
(a) Book value of an equipment
(b) Butterfly valve
(c) Bench Blasting
(d) Back hoe
(e) Escalator
(f) Derrick crane
(g) Clamshell
(h) Job and management factor
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