| 1. | Fig2-1 illustrates _____________. |
| | Zones of fracturing and deformation around an explosion in rock |
| | Combined Role of expanding gases |
| | None of the above |
| 2. | A chemical explosive is a compound or a mixture of compounds which, when subjected to heat, impact, friction, or shock, undergoes very rapid, self-propagating, heat- producing decomposition. |
| | Chemical explosive |
| | Hydrogen Peroxide |
| | Water |
| 3. | Important properties of explosives are weight strength, cartridge strength, detonation velocity, density, detonation pressure, water resistance, and fume class. |
| | True |
| | False |
| 4. | An electric blasting cap consists of two insulated leg wires inserted in an insulated metal capsule and connected by a thin-filament bridge tire as shown in page 40. |
| | True |
| | False |
| 5. | The ___________ as seen in Fig. 4-4 imparts two basic actions through the bit into the rock: axial thrust and torque. |
| | Rotary drill |
| | Rotary drag bit |
| | None |
| 6. | A single wagon drill can drill from ________of hole in a 9-hr shift as seen in page54 in the course. |
| | 200 to 400 ft | | | 150 to 300ft |
| | None |
| 7. | Figure 4-14 represents _____________. |
| | Rotary- percussive drill bit |
| | Churn drill bit |
| | None of the above |
| 8. | A basic coyote layout consists of a main adit driven perpendicular to the face with wing tunnels driven left and right at 90 deg as seen in page 70. |
| | True |
| | False |
| 9. | Rocks cannot be classified for blasting purposes according to their seismic velocity as seen in the rock types in page 84. |
| | True |
| | False |
| 10. | Fig. 6-5 represents ___________. |
| | Variation of shear strength with inclination to schistosity |
| | Effect of dipping strata on stability of excavation |
| | None of the above |
| 11. | Damage to nearby surface structures, such as buildings, bridges, concrete foundations, etc can result from air blasts, ground vibrations, and fly rock. |
| | True |
| | False |
| 12. | The processes as discussed in pages 100 & 101 in Chapter7 talk about______________. |
| | Airborne Vibrations and Air blasts |
| | Ground Vibrations |
| | None of the above Vibrations |
| 13. | The quantity (D/W1/2) in the general propagation relation for ground vibrations from blasting denotes ___________. |
| | Scaled distance |
| | Particle Velocity |
| 14. | The sample record of blasting is represented in figure___________. |
| | Figure 8-1 |
| | Figure 8-2 |
| | Figure 7-1 |
| 15. | Fig. 4-8 shows a _____________. |
| | Wagon Drill |
| | Churn Drill |
| | Hammer Drill |
| 16. | Blasting gelatin is a rubber- textured explosive made by adding nitrocellulose (guncotton) to nitroglycerin. |
| | True |
| | False |
| 17. | Straight gelatin is a dense, plastic explosive consisting of nitroglycerin or other explosive oil gelatinized with Nitro cellulose, an antacid, sodium nitrate, carbonaceous fuel, and sometimes sulfur. |
| | True |
| | False |
| 18. | Advantages of insensitive dry blasting agents are their safety, ease of loading, and low price. |
| | True |
| | False |
| 19. | Slurries are also called water gels. |
| | True |
| | False |
| 20. | A primer is a cartridge of explosive used in conjunction with a cap or detonating fuse to initiate the detonation of a blasting agent. |
| | True |
| | False |
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