EM 322 QUIZ 3

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

All are advantages of installing main fans at the surface except:

• a. accessibility

• b. safety of fans

• c. ease of installation

• d. efficiency

In this ventilation sysem, 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

True or False.  Where there is an increase in area,  there is an increase in static pressure at the expense of the velocity pressure

• a. True

• b. False

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

This ventilation system is preferred in Coal mine ventilation

• a. exhaust system

• b. Forcing System

• c. mine refrigeration system

• d. natural draft

This is the airstream to be directed to the surface

• a. static air

• b. return air

• c. intake air

• d. exhaust gas

These control devices separates the intake and return airstreams in adjacent airways

• a. overcast

• b. stoppings

• c. regulator

• d. all of the choices

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

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