Home/Volume-2/Mine Fires and Spontaneous Heating Volume-2 Mine Fires and Spontaneous Heating Admin03/08/20240 20 Less than a minute Report a question What's wrong with this question? You cannot submit an empty report. Please add some details. 0% Mine Fires and Spontaneous Heating Mine Fires and Spontaneous Heating 1 / 33 1. Do not allow the burning of fires within .....m from an incline opening? 10 15 20 25 2 / 33 2. The blanketing layer which is used to detect cracks in stoppings should be ....m thick? 1 2 3 4 3 / 33 3. The sample pipe should pass through the temporary stopping and should extend ....m beyond it towards the fire side? 1 m 2 m 3 m 4 m 4 / 33 4. During the process of sealing fire area below ground the atmosphere near the stowing should be tested frequently for ? Methane CO O2 deficiency Both CO and O2 5 / 33 5. In spontaneous heating the temperature of the initial stage is up to.....deg? 70 100 130 200 6 / 33 6. The coal stock should not exceed at least? 200 te 100 te 50 te 400 te 7 / 33 7. The coals are more prone to spontaneous heating if the coal having at least? 25 % V.M 15 % V.M 40 % V.M 50 % V.M 8 / 33 8. The coal is not liable to spontaneous heating if the coal has oxygen content? less than 2 % 4% 8% more than 9 % 9 / 33 9. If a quarry is abandoned the coal and the OB dump should be separated by digging a trench ....m wide? 1 - 2 m 3 - 5 m 6 - 10 m 11 - 15 m 10 / 33 10. The coal is more prone to spontaneous heating if the moisture content is? 0-2 % 2 - 4 % 4 - 7 % 7 - 15 % 11 / 33 11. The best extinguisher for gaseous fires is? Dry powder CO2 type Foam type Water - CO2 type 12 / 33 12. Thermal conductivity of shale is ....of sandstone? equal 1/4 1/2 1/3 13 / 33 13. With CO/O2 deficiency ratio 2 % indicates? Normal condition Existence of spontaneous heating Heating in advance stage Active fire 14 / 33 14. Spontaneous heating is more likely to occur in coals of? vitrain clarian durain fusain 15 / 33 15. The height of the coal stock should not exceed at least? 1 to 1.5 m 1.5 to 3 m 3 to 4 m 4 to 5 m 16 / 33 16. Air samples behind the stopping should be drawn during the periods of? High barometric pressure Low barometric pressure Medium barometric pressure none 17 / 33 17. The best extinguisher for fires involved live electrical equipment is? CO2 type Foam type Water -CO2 type Soda acid type 18 / 33 18. The isolation stopping should be explosion proof if the minimum CH4 % behind the stopping is ...? 1% 2% 3% 4% 19 / 33 19. The best extinguisher for fires due to oil is? CO2 type Foam type Water - CO2 type Soda acid type 20 / 33 20. In Gypsum stoppings for every cu.m of stopping volume about ...te of gypsum is required? 1.3 1.8 2.5 3 21 / 33 21. Ammonia should not be used in U/g mines as it forms an explosive mixture with air if present ..... by volume? 30% 40% 50% 20% 22 / 33 22. In CO2 extinguisher the pressure of the CO2 in liquid form is? 30 kg/sq.cm 50 kg/sq.cm 70 kg/sq.cm 100 kg/sq.cm 23 / 33 23. The incubation period in SCCL mines is? 6 months 10 months 18 months 24 months 24 / 33 24. Halon is also called as? CTC BCF TNT Ammonium sulfate 25 / 33 25. Spontaneous heating is more likely to occur in coals of? Peat Lignite Bituminous Anthracite 26 / 33 26. The minimum thickness of the explosion proof isolation stopping is? 1 m 3 m 4.5 m 6 m 27 / 33 27. Isolation stopping in deg I and II gassy coal mine should have minimum thickness of? 1 m 2 m 3 m 4 m 28 / 33 28. Temporary stoppings are constructed ? Before depillaring is undertaken After heating or fire is detected To seal off an area none 29 / 33 29. The ignition temperature of the bituminous coal is? 500 deg 450 deg 398 deg 200 deg 30 / 33 30. Stoppings should always be kept whitewashed on the surface and at the roof floor and sides for .....m outbye for every detection of cracks? 1 2 3 4 31 / 33 31. Isolation stoppings are ? Preparatory stoppings Temporary stoppings Permanent stoppings none 32 / 33 32. Isolation stopping should have minimum depth of locking in shale is? 1 m 75 cm 15 cm 30 cm 33 / 33 33. Air samples from behind the stoppings should be collected between? 6 am to 9 am 9 am to 12 noon 12 noon to 2 pm 10 pm to 12 pm Your score is The average score is 60% LinkedIn Facebook Twitter 0% Admin03/08/20240 20 Less than a minute
