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DGMS EXAM FCU- WINNING & WORKING 20 DEC 2021

FIRST CLASS WORKING COAL UR 20 DEC 2021

1) Which continuous mining equipment will be used for a Bench height of 25-30 mts in soft rock formation ______________

a) Rope shovel 

b) Bucketwheel excavators 

c) Dragline 

d) Electric shovel 

e) Rippers 

2) What would be the bord & pillar development gallery height in a coal seam of thickness varying from 3.4 to 4.2 m that is to be extracted to full seam thickness during depillaring? 

a) 2.8 m 

b) 3.0 m 

c) 3.4 m 

d) 3.8 m 

e) 4.2 m 

3) In how many layers shock tubes are extruded? 

a) 1

b) 2

c) 3

d) 4

e) 5

4) Choose the most suitable type of explosive for dragline bench blasting _____. 

a) Heavy ANFO 

b) Slurry 

c) ANFO 

d) Emulsion 

e) None of the options 

5) In U/G coal mines, blasting coal is carried out by drilling shortholes of about _____mm diameter. 

a) 25 mm 

b) 30 mm 

c) 35 mm 

d) 40 mm 

e) 45 mm 

6) The technique of blasting which is simpler, more economical and less hazardous than the method of breaking coal with machine cutting and blasting is 

a) off-the-solid 

b) under-cut 

c) middle-cut 

d) over-cut 

e) none-of-them 

7) Induced stress is independent of _________

a) Roof span                   

b) Area of exposure 

c) Compressive strength roof rock 

d) Unit weight of roof rock 

e) Presence of water 

8) with DERDS the cut coal is thrown on the face convey is by 

a) centrefugal force 

b) by the movement of the machine 

c) by the gummer 

d) cowel 

e) by air circulated 

9) Which of the following type of survey is specifically carried out while approaching a body of water likely to constitute a danger? 

a) Water danger survey 

b) Emergency survey 

c) Caution survey 

d) Chock survey 

e) Pressure balancing 

10) Identify the factor that effects the magnitude of surface subsidence above an underground coal mine working? 

a) Depth of working 

b) Thickness of working 

c) Panel Dimensions 

d) Goaf treatment 

e) All the options