1. The liquid employed in aneroid barometer.
2. The mechanical mixture of gases existing in a mine given off after explosion called
3. A Drager Gas Mask does not filter
4. The resistances of two splits A and Bare 0.35 Ns2m-8 and 0.05 Ns2m-8 respectively. The combined resistance of the shafts and trunk airways is 0.4 Ns2m-8. A booster fan is planned to be installed in split A to increase the quantity flowing through it. Assuming that the surface fan continues to operate at a constant pressure of 1000 Pa, the critical pressure of the booster fan in Pa is
5. A mine airway having cross-section of 2.2 m × 2.2 m and length 500 m contains a bend. Given that the airway friction factor is 0.01 Ns2m-4, shock loss factor for the bend is 0.07 and density of air is 1.2 kg/m3, the equivalent length of the airway in m is
6. Methane detector works on the principle of diffusion combustion contraction is
7. A mine fan delivers 50 m3/s of air at a fan drift of 10 mm of w.g. It is proposed to increase the quantity to 60 m3/s of air. the required w.g. shall be
8. When two identical and parallel intake roadways are changed to three identical and parallel intake roadways of same size and length, the ratio of new equivalent resistance to old equivalent resistance will be
9. The oxygen concentration in u/g working should not be less than
10. Which can be found by blotting paper soaked in lead acetate changes its colour black.
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