Mine Environmental Engineering - I Mid - II, November - 2014

1.Oil fires can be quenched by
  • Stone dust
  • Sand
  • Water
  • Foam extinguishers
Answer: D
2.The maximum explosive violence is produced when the explosive mixture contains about .................. of fire damp.
  • About 7%
  • About 9%
  • About 11%
  • About 13%
Answer: B
3.A good reflecting surface of light is
  • Matt
  • White
  • Silky
  • Black
Answer: B
4.The direction of the exploratory heading driven towards the water logged workings shall be to the old workings
  • 45deg
  • 60 deg
  • 90deg
  • 180deg
Answer: C
5.Flame proof enclosure is required by low, when the voltage of electrical machinery exceeds
  • 60volts
  • 50 volts
  • 40 volts
  • 30 volts
Answer: D
6.In gas mask, the chemical acting as a catalyst and changing co to co2 is
  • Anhydrous cacl
  • Silica gcl
  • Hopcalite
  • Caustic soda
Answer: C
7.The rescue team consists of ............. member.
  • 2 to 3
  • 3 to 4
  • 4 to 5
  • 5 to 6
Answer: D
8.A self contained breathing apparatus is of..............
  • Open circuit type
  • Closed circuit type
  • Filter type
  • Tube breathing type
Answer: B
9.An illumination of 1 lumen/sqmtr is
  • Lumen
  • Illumination
  • Lux
  • Reflection
Answer: C
10.For closing the road way in an emergency, an emergency shut off door shall built at about .......... away from the site of boring machine.
  • 5m
  • 10m
  • 15m
  • 45m
Answer: C
11.The aim of sealing off the fires is to ________________ to the face.
Answer: Prevent access
12.The process of self heating of coal resulting ultimately in its _________________ is known as spontaneous heating.
Answer: Combustion
13.Precautions shall be taken when the heading is with in _____________of the water logged area.
Answer: 60
14.Self heating of coal is called __________________.
Answer: Spontaneous heating
15.In the underground mines the place where the large amount of water is accumulated is called __________.
Answer: Sump
16.The type of extinguisher that can be used safely on fires of any kind is _______________.
Answer: CO2 gas
17.The unit of light emitted by a light sources is _____________________.
Answer: Lumen
18.The men spherical candle power of the flame safety lamp should not be less than _________________.
Answer: 1.5
19.As per reg the ratio of co/o2 absorbed should be analysed once at least __________________.
Answer: 15 days
20.Explosions in coal mines are of ____________________.
Answer: 3-types