💥 Blasting & Explosives MCQ Questions - Part 02
16. Safety fuse burns at an approximate rate of:
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Answer: B. 60 sec/m
17. Delay detonators are used to:
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Answer: B. Achieve sequential blasting
18. Cordtex is a type of:
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Answer: C. Detonating fuse
19. Foreman's signal before blasting is usually:
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Answer: C. Siren or whistle signals as per bye-laws
20. Connecting detonator wires should always be:
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Answer: B. Properly insulated and shunted
21. In underground fiery seams, maximum number of shots allowed at a face at one time is:
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Answer: B. 4
22. Multi-shot blasting in fiery seams must use:
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Answer: B. Approved delay detonators with permitted explosives
23. The most common cause of misfires is:
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Answer: B. Disconnection of detonator wires
24. Misfires should be dealt with only after at least:
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Answer: C. 30 minutes
25. Which of the following is NOT a permitted stemming material?
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Answer: C. Coal dust
26. Blasting operations must be supervised by:
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Answer: B. Qualified Shotfirer
27. In fiery seams, which type of explosives are strictly banned?
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Answer: B. Non-permitted ordinary explosives
28. Which instrument is used to test electric detonators before use?
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Answer: A. Ohmmeter/blasting ohmmeter
29. Charging of boreholes with explosives must be done with:
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Answer: A. Wooden tamping rods
30. Which DGMS rule prohibits relighting of short fuse shots?
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Answer: C. CMR 160
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