bank measur Isure, th in 100 worki The actual dept
Advanced Engineering Mathematics
10th Edition
ISBN:9780470458365
Author:Erwin Kreyszig
Publisher:Erwin Kreyszig
Chapter2: Second-order Linear Odes
Section: Chapter Questions
Problem 1RQ
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Transcribed Image Text:Question 2: Select the smallest
power shovel required to excavate
(54000m3 bank measure) of good
common earth in 100 working days
of 8 hrs. Each. The actual depth of cut
will be (2.1m) and an angle of swing of
(90°). Noting that the job conditions
are excellent, the management
conditions are good and the working
?.hour is 50 min
Table (6-1- Ideal Outpuns of Cable-Operated Power Shovel, in Cubic
meters Per t0-min hour, Bank Measure.
Ciass of
Size chovel, cubie meter
material a 4 06| O 12 14
16
Moist koum or 1L1
high sand clay " 12157" 19 21" 24S 271" 310
I LAA 20 21
al 4 s | is: 1 26 22 22
Sand and
gravel
2
Good conumon 14 17 2I
carth
24 26
534
29
5473 10s
Hard, tuugh
clay
156 IN
Well-blasted
mck
46
72
175
Wa, sicky
clay
L8 21
35
9 0 125
33
37
141
175
Poorly blasted
sock
122
*These values are the optimum depdh of ct in meters.
** These values are the ideal outputs in cubic meters.
Source Power Crane and Shovel Assuciatin
Table i-2 Conversion Facior for Depth ofCut and Angle of Swing
Percent
of Optimum
Eepth
40
Angle of awing de.
I80
150
120
90
75
60
45
.59
0.72
0.8
0.73
60
100
1.017
I 16
100
0.7
120
120
140
ass
896
Table (6-3) Coclficient Related to Management and Job
Conditions
Job
Conditions
Managoment Conditicns
Eeellan
084
078
072
Good
Fair
0.76
0.71
0.65
0.37
Poor
Ecellent
Good
Far
Poor
0.70
0.75
0.65
0.69
6.60
0.52
Values are hased on a 50-min per hour.
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