Finals Quiz 1 Flashcards
These fans are used to produce the general ventilation air current
in a mine.
a. auxiliary fans
b. booster fans
c. main fans
d. both a and c
c. main fans
All are advantages of installing main fans at the surface except:
a. accessibility
b. safety of fans
c. ease of installation
d. efficiency
d. efficiency
In this ventilation system, the fan inlet is open to the atmosphere
and the fan outlet to the mine intake shaft.
a. exhaust system
b. blowing system
c. mine refrigeration system
d. natural draft
b. blowing system
True or False. Where there is an increase in area, there is an
increase in static pressure at the expense of the velocity pressure.
True
In this ventilation system, the fan inlet is open to the mine
through the return shaft.
a. Blowing system
b. Exhaust System
c. mine refrigeration system
d. natural draft
b. Exhaust System
This ventilation system is preferred in Coal mine ventilation
a. exhaust system
b. Forcing System
c. mine refrigeration system
d. natural draft
a. exhaust system
This is the airstream to be directed to the surface
a. static air
b. return air
c. intake air
d. exhaust gas
b. return air
These control devices separates the intake and return airstreams
in adjacent airways
a. overcast
b. stoppings
c. regulator
d. all of the choices
b. stoppings
Used in areas where frequent adjustments to air direction are
necessary such as in the working panels
a. permanent stoppings
b. regulators
c. temporary stoppings
d. overcast
c. temporary stoppings
A 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.
a. airlock
b. door
c. stopping
d. regulator
c. stopping
__________is induced from the atmosphere through the mine
and back to the atmosphere by creating a differential pressure
between the intake and return openings of the mine
a. Air Volume
b. Air Density
c. Air Flow
d. Air Pressure
c. Air Flow
Two times the original volume of will require____________ times
the power of the fan.
a. 2
b. 4
c. 6
d. 8
d. 8
__________is the weight per unit of volume of the air-vapor
mixture.
a. Density of Mine Air
b. Volume of Mine Air
c. Pressure of Mine Air
d. Velocity of Mine Air
a. Density of Mine Air
The rate of increase of rock temperature with increasing depth,
which affects air temperature, is called
a. rock temperature
b. geothermal gradient
c. heat flow
d. geothermal energy
b. geothermal gradient
A term applied to a fan that handles the entire flow in an airway
and thus serves to increase the quantity of air in circulation.
a. axial flow fan
b. centrifugal fan
c. vane-axial fan
d. booster fan
d. booster fan
The following are methods of collecting dust except:
a. phagocytes
b. electrostatic dust and fume sampler
c. scrubbers
d. thermal precipitators
a. phagocytes
Which of the following is not a dust prevention method
a. Eliminating all forms of dry drilling
b. Sweeping the mine floor
c. Sprinkling dusty place with water
d. Using of dust protection apparatus
b. Sweeping the mine floor
The arrangement by which the intake or fresh air current is made
to cross the return or used air current.
a. stopping
b. air crossing
c. air lock
d. regulator
b. air crossing
It consists of double doors, which are placed in the roadways so
that when one door is opened, the other is closed.
a. regulator
b. man door
c. stopping
d. airlock
d. airlock
The practice of removing the gas contained in a coal seam and
adjoining strata through wellbores, drillholes, and pipelines.
a. Methane drainage
b. Acid mine drainage
c. Well production
d. borehole extraction
a. Methane drainage
A type of anemometer suitable for measuring very high velocities than special anemometers.
a. Vane anemometer
b. Velometer
c. Pilot tube apparatus
d. None among the choices
d. None among the choices
A coal mine section has a methane emission rate of 200 cfm and a
0.2% CH4 concentration in the intake air. What is the required
ventilation airflow. The threshold limit value of CH4 is 1.0%.
a. 50 cfm
b. 50 fpm
c. 50 cu.ft
d. 50 %
a. 50 cfm
Drainage in advance of mining (for coal mining) . This
underground gas control is part of:
a. Prevention
b. Removal
c. Adsorption
d. Dilution
b. Removal
It is also called back ‘pressure results’ from the inside of the vent
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
a. Velocity head
b. Static head
c. Load of a fan
d. Fixed pitch
b. Static head
Mine Airflow Distribution is completely defined by the following
except:
a. The physical parameters of the airways-shape, area, length and
character of the airway surface
b. The layout of the mine openings
c. The pressure sources in the system, their location &
characteristics
d. The type of commodity to be mined
d. The type of commodity to be mined
This does not cause mine explosion hazard.
a. coal dust
b. zinc dust
c. sulfide dust
d. mercury dust
d. mercury dust
These the are unintended losses of air directly to the return air
from the intake
a. shortage
b. leakage
c. airblast
d. friction
b. leakage
Which fan is preferred in hot mines?
a. Exhaust
b. Blowing
c. Both are preferred
d. Auxiliary fans
a. Exhaust
These are fans used to direct air to dead-end faces.
a. auxiliary fans
b. brattice
c. compressed air
d. booster fans
a. auxiliary fans
These are used in mines is commonly fiber-glass, corrugated iron or plastic impregnated cloth, the later is usually referred to as
“FAN BAG” or “VENT BAG”
a. brattice
b. check curtains
c. duct or tubing
d. regulator
c. duct or tubing
