National Study Guide Flashcards
Copper tube boilers have ____ heat transfer and ____ life span compared to cast iron boilers.
Better
Shorter
In an open system, the expansion tank is located ____ the ____ level radiator.
above the highest
Standard 3 light receptacle testers are not always reliable because different manufacturers have ____ ____ ____.
different light patterns
A downspout should terminate ____ grade ____ feet from the house.
Above grade 6’ from the house
You can check for flooring and subfloor thickness by removing a ____ ____ ____.
supply air register
Should service entrance wire be run inside a building before entering the service box?
No, and if no other option then as short as possible.
Steam heat is a type of ____ heating system.
Hydraulic
Serious cracks tend to be ____ in orientation.
Horizontal
Do faucets require isolating valves?
No
Heat pumps may sometimes have ___ expansion devices.
2
Vented decorative appliances shall be installed according to _____, conform with ANZI _____, and be supplied with both ____ and ____ ____.
Manufacturers instructions
Z21.50
Combustion and circulating air
Home inspectors must disclose any interests in a ____ that may affect the ____.
Business
Client
Inspection reports should focus on the ____ that people should ____.
actions
take
The final decision to enter the crawl space is made by the _____ when scheduling.
Client
High efficiency furnaces installed in old ductwork have ____ ____ ____.
Shorter life spans
Radiant heating systems are usually located in the _____.
Ceiling
A cracked heat exchanger or rusted burners cause accumulation of CO gas, which could result in _____.
spillage
A chimney should extend at least ___ ft beyond the point at which it penetrates the roof.
3’
____ pipe may not be used for potable water.
DWV -drain waste vent
Is there a limitation on the number of receptacles that can be placed on a lighting circuit?
No
Where a masonry wall meets a roof surface, ____ ____ is required to prevent water penetration.
Counter flashing
Backflow prevention devices for a lawn irrigation system typically lasts about ____ years.
12
NM cable sheathing may be repaired with ____ ____.
Electrical tape
The minimum clearance between a masonry chimney and combustible material is ___ inches.
2”
A steel sink will typically rust out at the ____ ____.
Overflow channel
A masonry chimney with 2 high and 2 low air grill inserts is evidence of a _____.
Heatilator
The function of a draft hood on a gas water heater is to ____ air to the ____ system to maintain chimney ____.
add
venting
draft
The flue serving a gas fired water heater must be the ____ wall type, must terminate at least ___ ft above the roof or any surface within ___ ft of the termination, and requires a noncombustible ____ at any ceiling or wall penetration.
double
2’
8’
thimble
A ____ ____ flex connector may not be used as a gas connector for a pool heater
bare brass
Joist ____ has little effect on deflection.
width
A lack of ____ ____ can cause water hammer.
air chambers
Switching from natural gas to propane requires installing a new ____, or the flame will be too ____.
orifice
high
Low pressure boiler pipes carry pressures at or below ____ PSI.
15
Foundation drains collect water as it passes ____ through the ____.
laterally
slope
The minimum slope roof in which asphalt shingles may be used is _____.
2/12
Squash blocks should be used on I joists at ____ ____ and ____ ____ walls with support ____ below.
bearing ends
load bearing
girders
Electrical service wires require a minimum of ____ ‘ clearance above walking surface and ____ ‘ above a roadway.
10’
18’
A higher temperature differential could suggest a ____ ____ ____.
dirty air filter
A residential driveway requires at least ___ ft of clearance for electrical service wires.
12’
A ____ union is used to separate differing metals to prevent ____ action and ultimately _____.
dielectric
galvanic
corrosion
The minimum clearance between wood stove single wall vent connector and combustibles is ____ inches.
18”
Capillary tubes are part of a _____ _____.
Evaporator coil
Minimum clearance between masonry chimney and combustibles is ___ inches.
2”
An ____ meter can be used to confirm bonding of appliances.
Ohm
Service panels must open at least ___ degrees.
90
A residential refrigeration system requires regular cleaning of the ____ ____.
Condenser coil
Windows requires safety glass if the bottom edge is within ____ of the floor.
18”
Crawl spaces with a vapor retarder require 1 sq ft of ventilation area per _____ sq ft of crawl space.
1500 sq ft
