National Study Guide 2 Flashcards
Ice dams cause _____.
Water damage at ceiling/wall intersections
Where steep pitch roof meets low pitched roof, area is vulnerable to ___ ____ on the ____ pitch side.
water penetration
lower
Steel rebar too close to surface may cause _____.
Spalling
Wood siding should be ___ inches above grade.
6
Broken bricks may indicate that the _____ was weaker.
mortar
Common defects branch circuits include _____, _____, and _____.
open boxes
Open splices
Oversized/undersized conductors
Common burner deficiencies include ____, ____, and ____.
Flame lifting
Flame rollout
Flashback
Mid efficiency furnaces may be vented through the _____.
Sidewall
A cracked boiler heat exchanger will _____ at least part of the time.
Leak
Common dangerous cracks in wood fireplaces are between the _____ and _____ ____.
Hearth
Hearth extension
Steel lintels required ____ “ of end bearing.
6”
Main service disconnect can be where in relation to the service attachment?
Adjacent to or on the wall opposite
Common branch circuit conductors are made of ____, ____, or ____.
Copper
Aluminum
Nickel clad copper
Supply air registers should be located ____ on ____ walls for forced air heat systems.
Low
Exterior
Conventional air cooled a/c systems have ___ heat transfer coils.
2
Landings are not required at exterior doors if they serve as a ____ entrance.
Secondary
____, ____, ____, and ____ vents are all types of roof vents.
Soffit
Ridge
Static
gable
After entering the service box, the grounded conductor should connect to the ____ ____ with ____ ____ conductors.
Bus bar
White insulated
Common deficiencies in house air fans include ____ , ____, and ____ but ____ is not common.
dirty
out of balance
noisy
installed backwards
Old conventional efficiency, cast iron boilers have a life expectancy of ____ to _____ years.
35
50
Masonry chimneys serving a wood fireplace should be at least ____ feet tall.
15
_____ is a common problem with water cooled a/c coils.
Leaking