How many times of power required in order to develop twice the volume?
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Terms in this set (54)
It is the underground mine gas otherwise known as the "sweet damp".Carbon monoxideIt is the underground mine gas otherwise known as the "white damp".Carbon monoxideIt is the underground mine gas otherwise known as the "marsh gas".methaneIt is the underground mine gas otherwise known as the "choke" or "black damp".carbon dioxideThe amount of oxygen in underground mines required under the "Revised Mines Safety Rules and Regulations" is ___ by volume.20%It is the "Revised Mines Safety Rules and Regulations" issued by the Department of Environment and Natural Resources.Mine Administrative Order No. MRD-51The maximum concentration allowed for hydrogen in underground mines as per "Revised Mines Safety Rules and Regulations".less than 4.0% by volumeThe threshold limit value of sulfur dioxide as per "Revised Mines Safety Rules and Regulations".0.001% by volumeThe threshold limit value of oxides of nitrogen as per "Revised Mines Safety Rules and Regulations".0.0005% by volumeThe threshold limit value of hydrogen sulfide as per "Revised Mines Safety Rules and Regulations".0.10% by volumeThe threshold limit value of carbon monoxide as per "Revised Mines Safety Rules and Regulations".0.01% by volumeThe threshold limit value of carbon dioxide as per "Revised Mines Safety Rules and Regulations".0.50% by volumeHydrogen gas is explosive with this range of concentration.4-74% by volumeMethane is explosive within this range of concentration.5-15% by volumeThis does not cause mine explosion hazard. a. coal dust b. sulfide dust c. mercury dust d. lead dustc. mercury dustIt is the amount of oxygen consumption of man at vigorous activity.180 cu. in/ minuteSpecific gravity of oxygen.1.1054The oxidation and combustion of organic compounds otherwise called coke produce it.carbon dioxideA gas brownish or reddish in color, bitter taste, specific gravity is 2.263, also known as laughing gas.nitrogen dioxideThe arrangement by which the intake or fresh air current is made to cross the return or used air current.air crossingA strong brick wall built at suitable places to seal galleries or other underground excavations to enable the air current to flow into working places with minimum loss of pressure and prevent from flowing to unwanted places.stoppingIt consists of double doors, which are placed in the roadways so that when one door is opened, the other is closed.air lockA part of centrifugal fan, which provides the factor for efficient static head build-up.scroll casingA fan that produces pressure by imparting a tangential acceleration to air as it proceeds through the fan impeller.axial flow fanIt shows the amount of power consumed at different output rates; it is also used in the determination of the amount of power needed to pass a particular volume of air.brake power curveThe point of maximum explosion violence occurs at ___ % methane by volume, since at this point there is just enough oxygen for complete combustion of the methane.9.5%In hydrogen sulfide gas, a simple test may be made with lead acetate paper that turns into a shiny ____ through the formation of lead sulfide if the gas is present.brownThe term for the temperature of the air at saturation.dew pointThe ratio of water vapor present in a given volume of air to the water vapor that would be present if the air is saturated at the same temperature.relative humidityThe rate of increase of rock temperature with increasing depth, which affects air temperature, is called ______.geothermal gradientA term applied to a fan that handles the entire flow in an airway and this serves to increase the quantity of air in circulation.booster fanThe velocity at which the flow turned from streamline to turbulent condition is called _____.critical velocityIt is also called back 'pressure results' from the inside of the bent tube or drift not being perfectly smooth, the air cannot move along the tube or drift as fast as the fun would like to blow more air into the airway thus producing friction.static headIt is a vertical or horizontal opening to the surface where air enters and circulate inside the mine with the aid of different fans.intakeA type of anemometer suitable for measuring very high velocities than special anemometers.pilot tube apparatusThe practice of removing gas contained in a coal seam and adjoining strata through wellbores, drill holes, and pipelines.methane drainageThe mixture of gases which remains in a mine after a mine fire or an explosion of fire damp or coal dust.after dampClass "A" underground mine has at least ____ workers.150Which mine has the most number of workers?Class AThe ideal number of members of a miner rescue team.5The required number of safety engineers in a Class A mine.one full-timeThe deputized safety inspector should have (a) one year experience in safety works; (b) three years experience underground; (c) five years experience in safety works; (d) at least ten years of service in the company.*at least ten years of service in the companyd.Persons to work in an underground mine should be at an age not lower than __.18A Class A surface mine should have at least ___ workers.250