MINING MACHINERY QUIZ (6) (55- 66) 10 Questions....! | .
MINING ENGINEERING
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55)
The arc of contacting of winding rope in tower mounted friction winding
is....deg ?
1) 90 to 120
2) 120 to 150
3) 200 to 230
4) 250 to 280
56)
The arc of contacting of winding rope in friction winding is....deg ?
1) 90 to 120
2) 120 to 150
3) 185 to 230
4) 250 to 280
57)
The coefficient of friction between the sheave lining and the rope is minimum
of?
1) 0.12
2) 0.2
3) 0.4
4) 0.65
58)
The rope may slip over the wheel when the ratio T1:T2 exceeds a value?
1) 1.2 to 1.3
2) 1.4 to 1.5
3) 1.5 to 1.6
4) 1.8 to 2
59)
In very deep mining the method of winding best suited is?
1) Drum winding
2) Koepe winding
3) Tower mounted koepe winding
4) Blair winding
60)
The method of speed control and electric winder of large capacity i.e above
800kw is?
1) sheostatic control
2) Liquid control
3) Ward leonard speed control
4) Electrical breaking
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61)
Automaric contrivances should be provided for every shaft exceeding
minimum....m depth?
1) 50
2) 80
3) 100
4) 150
62)
When men are being hoisted orlowered as the cage appoached pit top or pit
bottom decking level its speed should not exceed 1.5 m/sec such arrangement is
known as?
1) Over speed device
2) Overwind device
3) Ward leonard control
4) Slow banking device
63)
Mechanical breaks are applied upto depth of?
1) 100 m
2) 200 m
3) 300 m
4) 400 m
64)
Regenerative braking is used when?
1) Hoisting loads
2) lowering loads
3) Inspection of the cage
4) None
65)
In koepe winding the overwind is prevented by?
1) Detaching hook
2) Automatic contrivances
3) Convergence of the guides
4) None
66)
In the event of power failure the brake automatically applied is?
1) Mechanical brake
2) Thrustor brake
3) Regenarative brake
4) None
ANSWERS FOR ABOVE QUESTIONS
55) 3
56) 3
57) 2
58) 3
59) 4
60) 3
61) 3
62) 4
63) 2
64) 2
65) 3
66) 2
| Mining is like a search-and-destroy mission. |
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MINING ENGINEERING
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