DRILLING AND BLASTING Multiple Choice Questions

1. A building where explosives and detonators are stored is called

1. shelter
2. magazine
3. store
4. house

2. The drilling pattern followed in underground coal mine is

1. wedge cut
2. fan cut
3. coromant cut
4. drag cut

3. The portable apparatus which provides the current necessary for firing electric detonators is called

1. charger
2. exploder
3. condensor
4. dynamo

4. What is the full form of PETN

1. Penta ethane tetra nitrate
2. Penta erythritol trinitrate
3. penta erythritol tetra nitrate
4. penta ethane tolluine nitrogen

5. which of the following is true for ordinary electric detonator

1. instantaneous type
2. delay type
3. plain detonator
4. fired by safety fuse

6. A delay detonator has a delay element introduced between

1. priming charge and base charge
2. fuse head and priming charge
3. neoprene plug and neoprene sleeve
4. detonator tube and fuse head

7. The delay detonators and non-delay detonators are distinguished physically by

1. The colours of lead wires
2. base charge
3. priming charge
4. neoprene plug

8. Which of the following detonators are used with P5 explosives (solid blasting)?

1. instantaneous type detonators
2. short delay aluminum incendive detonators
3. carrick short delay non-incendive detonators
4. aluminum based long delay detonators

9. What are the available delay numbers with copper tube only to be used with solid blasting?

1. 0-3
2. 0-6
3. 0-10
4. 0-20

10. Which of the following detonators are used mostly in oil and mineral prospecting?

1. plain detonators
2. electric short delay detonators
3. ordinary long delay detonators
4. seismic detonators