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