| 1. |
Fig2-1 illustrates _____________. |
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Zones of fracturing and deformation around an explosion in rock |
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Combined Role of expanding gases |
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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. |
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Chemical explosive |
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Hydrogen Peroxide |
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Water |
| 3. |
Important properties of explosives are weight strength, cartridge strength, detonation velocity, density, detonation pressure, water resistance, and fume class. |
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True |
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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. |
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True |
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False |
| 5. |
The ___________ as seen in Fig. 4-4 imparts two basic actions through the bit into the rock: axial thrust and torque. |
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Rotary drill |
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Rotary drag bit |
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None |
| 6. |
A single wagon drill can drill from ________of hole in a 9-hr shift as seen in page54 in the course. |
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200 to 400 ft |
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150 to 300ft |
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None |
| 7. |
Figure 4-14 represents _____________. |
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Rotary- percussive drill bit |
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Churn drill bit |
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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. |
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True |
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False |
| 9. |
Rocks cannot be classified for blasting purposes according to their seismic velocity as seen in the rock types in page 84. |
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True |
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False |
| 10. |
Fig. 6-5 represents ___________. |
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Variation of shear strength with inclination to schistosity |
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Effect of dipping strata on stability of excavation |
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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. |
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True |
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False |
| 12. |
The processes as discussed in pages 100 & 101 in Chapter7 talk about______________. |
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Airborne Vibrations and Air blasts |
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Ground Vibrations |
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None of the above Vibrations |
| 13. |
The quantity (D/W1/2) in the general propagation relation for ground vibrations from blasting denotes ___________. |
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Scaled distance |
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Particle Velocity |
| 14. |
The sample record of blasting is represented in figure___________. |
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Figure 8-1 |
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Figure 8-2 |
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Figure 7-1 |
| 15. |
Fig. 4-8 shows a _____________. |
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Wagon Drill |
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Churn Drill |
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Hammer Drill |
| 16. |
Blasting gelatin is a rubber- textured explosive made by adding nitrocellulose (guncotton) to nitroglycerin. |
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True |
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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. |
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True |
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False |
| 18. |
Advantages of insensitive dry blasting agents are their safety, ease of loading, and low price. |
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True |
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False |
| 19. |
Slurries are also called water gels.
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True |
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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. |
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True |
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False |
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