Book 2 Chapter 8: Ventilation And Air Filters

Question 1

Living organisms that must be removed from the air are:
A) Insects and pollen
B) Bacteria and insects
C) Bacteria and spores
D) Pollen and spores

Answer 1

C) Bacteria and spores

Question 2

The air velocity through a viscous filter can be __________ higher than with dry filters.
A) 2.5m/s (500ft/min)
B) 4.0m/s (800ft/min)
C) 4.5m/s (900ft/min)
D) 7.5m/s (1500ft/min)

Answer 2

A) 2.5m/s (500ft/min)

Question 3

The carbon in an odour adsorber may be reactivated by heating it to __________ to drive out the adsorbed gases.
A) 250ºC (480ºF)
B) 538ºC (1000ºF)
C) 425ºC (800ºF)
D) 175ºC 350ºF)

Answer 3

B) 538ºC (1000ºF)

Question 4

The best filters available for ventilation system lint removal are:
A) Charged-media electronic
B) Dry
C) Viscous impingement
D) Activated alumina chemisorbant

Answer 4

B) Dry

Question 5

What precaution must be taken when using ultaviolet lighting for sterilizing air in ventilation systems?
A) Correct supply voltage
B) Safety glasses
C) Sufficient number of units
D) Positioning the lamps so they cannot hit occupants

Answer 5

D) Positioning the lamps so they cannot hit occupants

Question 6

In a mechanical air intake, natural exhaust ventilation system the pressure in the building is:
A) Well below atmospheric pressure
B) Slightly below atmospheric pressure
C) At atmospheric pressure
D) Slightly above atmospheric pressure
E) Well above atmospheric pressure

Answer 6

D) Slightly above atmospheric pressure

Question 7

Which of the following is considered an advantage of a mechanical ventilation system?
A) The entire system only requires one fan
B) The system generates its own heat and cooling
C) The system does not require any electrical power
D) The system does not require any duct work
E) Controlled amounts of filtered and heated air can be supplied

Answer 7

E) Controlled amounts of filtered and heated air can be supplied

Question 8

An example of visible solid particle contaminants in the air is:
A) Exhaust
B) Snow
C) Insects
D) Mist
E) Bacteria

Answer 8

C) Insects

Question 9

An example of a microscopic solid particle in the air is:
A) Bacteria
B) CFC’s
C) Nitrous oxides
D) Dust
E) Smoke

Answer 9

E) Smoke

Question 10

The activated carbon used for absorbing odours can be sometimes reactivated by:
A) Cooling
B) Charged with negative ions
C) Heating
D) Charged with positive ions
E) Washing with water

Answer 10

C) Heating

Question 11

Ultraviolet light is used to sterilize _________ in the air.
A) Bacteria and spores
B) Lint
C) Fine dust and smoke
D) Dust and fibre
E) Mists and fogs

Answer 11

A) Bacteria and spores

Question 12

One of thee advantages of a common exhaust duct system used for ventilation in a large building is:
A) Ease of maintenance (only one fan is used)
B) Power is not required
C) Low maintenance (no fan)
D) Windows can be eliminated
E) High output power

Answer 12

A) Ease of maintenance (only one fan is used)

Question 13

Electrostatic filters are highly efficient in the removal of:
A) Mists and fogs
B) Fine dust, smoke, and fumes
C) Bacteria and spores
D) Lint
E) Dust and pollen

Answer 13

B) Fine dust, smoke, and fumes

Question 14

Mechanical filters can be divided into two broad classes:
A) Corrugated and smooth
B) Throwaway and renewable
C) Dry and viscous
D) Wet and dry
E) Rotating and stationary

Answer 14

B) Throwaway and renewable

Question 15

Viscous filters are highly efficient in the removal of:
A) Mists and fogs
B) Cooking odours
C) Dust and pollen
D) Fine dust, fumes, and smoke
E) Bacteria and spores

Answer 15

C) Dust and pollen

Question 16

The ________ filter is the best filter available for the removal of fine dust, smoke, and fumes.
A) Electronic
B) Dry
C) Electrostatic
D) Viscous impingement
E) Mechanical

Answer 16

C) Electrostatic

Question 17

One of the basic methods of ventilation is:
A) Mechanical draft
B) Induced draft
C) Ventilation draft
D) Balanced draft
E) Forced draft

Answer 17

A) Mechanical draft

Question 18

The viscous impingement filter contains filter media of tightly packed glass fibre, copper or aluminum wool, crimped metal, etc. that is coated with a _______ fluid.
A) Glue like
B) Oily
C) Viscous or sticky
D) Petroleum oil
E) Vegetable oil

Answer 18

C) Viscous or sticky

Question 19

The contaminants suspended in the air include the following except:
A) Living organisms
B) Gases like nitrogen
C) Solid particles of visible size
D) Solid particles of microscopic size
E) Liquid impurities

Answer 19

B) Gases like nitrogen

Question 20

Air sterilizers use germicidal lamps that emit ________ which effectively destroys bacteria and spores in the air:
A) Ultraviolet light
B) Alpha radiation
C) Gamma radiation
D) Beta radiation
E) Infrared light

Answer 20

A) Ultraviolet light

Question 21

The system of mechanical air intake natural exhaust keeps the pressure in the building slightly higher than atmospheric pressure and so prevents:
A) Dehumidification
B) Infiltration
C) Ventilation
D) Humidification
E) Drafts

Answer 21

B) Infiltration

Question 22

In the electrostatic filter the collector plates are charged with __________ volts DC
A) 5000
B) 6000
C) 13000
D) 15000
E) 1000

Answer 22

B) 6000

Question 23

The best filters available for ventilation system lint removal are:
A) Air washer
B) Activated alumina chemisorbant
C) Viscous impingement
D) Charged-media electrostatic
E) Dry

Answer 23

E) Dry

Question 24

In the electronic filter dust particles are charged by passing the contaminated airflow through an ionizing zone by an arrangement of wires charged with ________ volts DC potential.
A) 10000
B) 60000
C) 13000
D) 12000
E) 15000

Answer 24

C) 13000

Question 25

The system of mechanical air intake, natural exhaust can supply fresh air in all of the following ways except:
A) By a propeller fan mounted in the outside wall
B) By installing a fresh air supply duct in a warm air heating system
C) By use of a makeup air heater
D) By an exhaust fan mounted in the outside wall
E) By unit ventilators that draw in a controlled amount of outside air

Answer 25

D) By an exhaust fan mounted in the outside wall