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The diameter of holes in mm commonly used for ring drilling by drifters in sublevel stoping is between
A ring (E = 0.85) of 8 cm inner and 16 cm outer diameter is placed in a horizontal plane. A small element (E = 0.7) of 1 cm2 is placed concentrically 8 cm vertically below the center of the ring. The temperature of the ring is 800 K and that of small area is 400 K. Find the radiant heat gain by the small ring
The engagement diamond ring of 'N' was stolen by 'T', a thief who sold it to 'J' a jeweller. 'N' filed a suit for recovery of ring against 'J'. 'J' contended that he is ready to pay the price of the ring. Whether the decree for recovery of diamond ring can be refused on the ground that
After every round of blasting, support of roof and sides shall be tested at places within the zone of influence of blasting. Who decides this zone?
According to the process in the theory of blasting in tunnel engineering, how many types are used for rock blasting?
What is the correct sequence of the following events of construction of a shaft in rock?
1) Drilling and blasting
ii) Timbering
iii) Pumping
iv) Mucking
Select the correct answer
Consider the following operations:
1. Drilling
2. Blasting
3. Mucking
4. Placing steel
5. Placing concrete
The correct sequence of these operations in tunnel construction is
Drilling, blasting is eliminated in the following open-cast method.
Cable drilling employed commonly employed for holes deeper than
Four bells ring at intervals of 5, 10, 12 and 15 minutes respectively. If they start ringing together at 3 o'clock, after what interval of time will they ring together and how many times will they ring together in 18 hours?