Mine Environment — Part 2 MCQs with Explanations

7.1 is the correct answer to “Find the percentage of blackdamp from the mine air sample (pressure by volume) shown below: O 2 = 19.11; N 2 = 79.04; CO 2 = 0.25; CO = 0.02; CH 4 =1.58”. This question is standard in competitive examination syllabi for Mine Environment.

roughness of the sides of the airway and the Reynold's number is the correct answer to “The method factor for anemometer reading in duct varies with the”. This question is standard in competitive examination syllabi for Mine Environment.

10 W is the correct answer to “What is the acoustical power of a 100 hp air compressor whose rated sound power level is 130 dB”. This question is standard in competitive examination syllabi for Mine Environment.

It is the ratio of the head at the operating point to Euler's head at zero capacity is the correct answer to “What do you mean by head co-efficient”. This question is standard in competitive examination syllabi for Mine Environment.

Ionisation of the particles is the correct answer to “Electrostatic precipitator works on the principle of”. This question is standard in competitive examination syllabi for Mine Environment.

fan stator is the correct answer to “Noise in fans is a function of A. Where A is given by”. This question is standard in competitive examination syllabi for Mine Environment.

1.25% is the correct answer to “As per Indian law the methane concentration should not exceed "A%" in any part of the mine. A is given by”. This question is standard in competitive examination syllabi for Mine Environment.

H2SO4 + distilled water is the correct answer to “What are the composition of the solution in which the plates of the Oldham cap lamp battery remain immersed”. This question is standard in competitive examination syllabi for Mine Environment.

100 is the correct answer to “In ambient air of an School locality, the permissible concentration of PM 10 measured on 24 hours average in μg/m 3 is”. This question is standard in competitive examination syllabi for Mine Environment.

simslin is the correct answer to “This is a British instrument that works on tyndall effect and comprises of a collimated beam of near-infra red light passing through a dust chamber. Identify the instrument”. This question is standard in competitive examination syllabi for Mine Environment.