EOM 2 paper 12

56,The noxious and infalmmable gasses of old workings of a coal mine expands when there is?

sudden rise of temparature,

sudden heavy roof fall,

sudden rise in barometric pressure,

sudden drop in barometric pressure

57,The instrument that is used to measure the relative humidity is?

pitot tube,

aneroid barometer,

hygrometer,

anemometer,

58,For comfortable working conditions the reasonable velocity of air at the working face is?

0.5 to 2 m/s,

3 to 4 m/s,

5 m/s,

6 m/s,

59,cooling power by conduction convection and radiation is given by using the ?,

dry bulb temparature,

wet bulb temparatute,

Average time of wet and dry bulbs,

wet and dry bulb time and velocity of air

60,Inclined water guage is used for the measurment of water guage for?,

smaller than 200 mm,

greater than 200 mm,

smaller than 50 mm,

greater than 50 mm,

Ans: 4,3,1,2,3