OBT 2 Mohawk UPDATED Actual Exam
Questions and CORRECT Answers
Purpose of the CBP radiation detection pro About _____________ cubic feet of air is
required to ensure complete combustion of one [1] gallon of #2 fuel oil. - CORRECT
ANSWER✔✔- 2000
T/F? Air supply openings that communicate with the outdoors of a building must be located
not less than twelve [12] inches above the outside grade level. - CORRECT ANSWER✔✔-
True
An oil-fired boiler with an input of 0.75 USGPH that is vented into a clay lined masonry
chimney 20 feet high must maintain a minimum base temperature of ____________ °F. -
CORRECT ANSWER✔✔- 320°F
A furnace rated at 0.75 USGPH is connected to a twenty [20] foot high clay tiled lined
masonry chimney. The thermal resistance is R2. Using the B139 code book vent tables,
determine an acceptable vent diameter range. - CORRECT ANSWER✔✔- 4 to 5 Inches
T/F? The minimum distance a vent can terminate from a gas utility service regulator is one
[1] foot and from the regulator's vent outlet is four [4] feet. - CORRECT ANSWER✔✔-
False
A single wall vent connector on a furnace with a draft regulator should never be installed in
an unheated space; furthermore, an appliance's vent connector passing through an unheated
space must be a ______________________ vent. - CORRECT ANSWER✔✔- double wall or
insulated
T/F? A single wall vent connector with a vent temperature not exceeding 750 °F must be at
least three [3] inches away from combustible materials. - CORRECT ANSWER✔✔- False
An oil venting system shall terminate from a building mechanical air inlet, or operable
window or door by no less than _____________________________ feet. - CORRECT
ANSWER✔✔- 6ft
, T/F? An unlined masonry chimney, correctly sized and in good condition, may accommodate
a new oil-fired appliance. - CORRECT ANSWER✔✔- False
The essential elements of a building are the - CORRECT ANSWER✔✔- building envelope,
occupants, mechanical systems and external environment
Building skin is required to - CORRECT ANSWER✔✔- protect the underlying materials
T/F? If the heat loss of a building is 50 000 Btu/h, the furnace to be selected should have an
input of 50 000 Btu/h or more. - CORRECT ANSWER✔✔- False
The best way to remove dust from a building is to - CORRECT ANSWER✔✔- filter the air
or exhaust it mechanically
T/F? The most effective way to reduce heat loss is to seal air leaks around the windows using
a caulking gun. - CORRECT ANSWER✔✔- True
T/F? The purpose of a heating appliance is to heat the occupants in a building. - CORRECT
ANSWER✔✔- False
Negative pressure in a building can be caused by a[n] - CORRECT ANSWER✔✔- lack of
makeup or combustion air
T/F? Evaporation increases the rate of heat transfer. - CORRECT ANSWER✔✔- True
T/F? Occupants will experience higher heat losses as a result of greater air movement. e.g.
from fan blowing air - CORRECT ANSWER✔✔- True
T/F? Occupants will experience lower heat losses as a result of higher humidity levels in a
heated building. - CORRECT ANSWER✔✔- True
The best location to install a forced air furnace is
__________________________________________________________________. -
Questions and CORRECT Answers
Purpose of the CBP radiation detection pro About _____________ cubic feet of air is
required to ensure complete combustion of one [1] gallon of #2 fuel oil. - CORRECT
ANSWER✔✔- 2000
T/F? Air supply openings that communicate with the outdoors of a building must be located
not less than twelve [12] inches above the outside grade level. - CORRECT ANSWER✔✔-
True
An oil-fired boiler with an input of 0.75 USGPH that is vented into a clay lined masonry
chimney 20 feet high must maintain a minimum base temperature of ____________ °F. -
CORRECT ANSWER✔✔- 320°F
A furnace rated at 0.75 USGPH is connected to a twenty [20] foot high clay tiled lined
masonry chimney. The thermal resistance is R2. Using the B139 code book vent tables,
determine an acceptable vent diameter range. - CORRECT ANSWER✔✔- 4 to 5 Inches
T/F? The minimum distance a vent can terminate from a gas utility service regulator is one
[1] foot and from the regulator's vent outlet is four [4] feet. - CORRECT ANSWER✔✔-
False
A single wall vent connector on a furnace with a draft regulator should never be installed in
an unheated space; furthermore, an appliance's vent connector passing through an unheated
space must be a ______________________ vent. - CORRECT ANSWER✔✔- double wall or
insulated
T/F? A single wall vent connector with a vent temperature not exceeding 750 °F must be at
least three [3] inches away from combustible materials. - CORRECT ANSWER✔✔- False
An oil venting system shall terminate from a building mechanical air inlet, or operable
window or door by no less than _____________________________ feet. - CORRECT
ANSWER✔✔- 6ft
, T/F? An unlined masonry chimney, correctly sized and in good condition, may accommodate
a new oil-fired appliance. - CORRECT ANSWER✔✔- False
The essential elements of a building are the - CORRECT ANSWER✔✔- building envelope,
occupants, mechanical systems and external environment
Building skin is required to - CORRECT ANSWER✔✔- protect the underlying materials
T/F? If the heat loss of a building is 50 000 Btu/h, the furnace to be selected should have an
input of 50 000 Btu/h or more. - CORRECT ANSWER✔✔- False
The best way to remove dust from a building is to - CORRECT ANSWER✔✔- filter the air
or exhaust it mechanically
T/F? The most effective way to reduce heat loss is to seal air leaks around the windows using
a caulking gun. - CORRECT ANSWER✔✔- True
T/F? The purpose of a heating appliance is to heat the occupants in a building. - CORRECT
ANSWER✔✔- False
Negative pressure in a building can be caused by a[n] - CORRECT ANSWER✔✔- lack of
makeup or combustion air
T/F? Evaporation increases the rate of heat transfer. - CORRECT ANSWER✔✔- True
T/F? Occupants will experience higher heat losses as a result of greater air movement. e.g.
from fan blowing air - CORRECT ANSWER✔✔- True
T/F? Occupants will experience lower heat losses as a result of higher humidity levels in a
heated building. - CORRECT ANSWER✔✔- True
The best location to install a forced air furnace is
__________________________________________________________________. -
