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Electrical Level 2 Hvac Questions And Answers With Verified Solutions Already Passed!!!
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Electrical Level 2 Hvac Questions And Answers With Verified Solutions Already Passed!!!
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Electrical Level 2 Hvac Questions AndAnswers With Verified Solutions Already
Passed!!!
What is the usual "watts per unit length" rating of standard density baseboard
heaters? - ANSWER✔✔ 820W/m or 250W/ft
Where in a room should baseboard heaters be mounted? - ANSWER✔✔ At floor
level, centered along walls, and near areas of high heat loss (such as under
windows)
What type of heater is normally installed a ceiling height? - ANSWER✔✔ Unit
heaters (vertical or horizontal air projection types)
Residential electric furnaces are usually available in both single phase and three-
phase ratings from ___kW to ___kW. - ANSWER✔✔ 5-40kW
What type of electric heater unit can be used with certain oil-fired, forced-air
furnaces? - ANSWER✔✔ Plenum heaters
List three applications for heating cable sets: - ANSWER✔✔ -radiant space
heating (floor/ceiling)
-driveway/sidewalk ice melting
-freeze protection on pipes
Residential water heaters are commonly available in ___kW and ___kW ratings. -
ANSWER✔✔ 3-4.5kW
What are three types of thermostats commonly used in residential space heating? -
ANSWER✔✔ Line-voltage
Low-voltage
electronic
If a heat lamp using a medium-base lampholder is installed in a residential
bathroom, does it have to be on separate heating branch circuit? - ANSWER✔✔
No; CEC 62-108(3)
, What size conductor would you need to supply a 3kW baseboard heater fed by a
240 V circuit? - ANSWER✔✔ AWG #12. (3000W/240V=12.5A)---
>(12.5/.8=15.625A) ---> requires 20A breaker.
What is the maximum setting of overcurrent device allowed to protect branch
circuit wiring supplying two or more residential baseboard heaters? -
ANSWER✔✔ 30A; CEC 62-114(2)
is it necessary that a thermostat with a marked OFF position disconnect all
ungrounded conductors in the circuit? - ANSWER✔✔ Yes; CEC 62-118(2)
Why is it not permissible to shorten the heating portion of a series heating cable
set? - ANSWER✔✔ The series resistance would be reduced, resulting in increased
current and possible overheating (fire hazard); CEC 62-122(1)
Indoor heating cable sets that are to be embedded in concrete shall bear the
designation type: - ANSWER✔✔ 1B; CEC 62-124(1) & Table 60
Where are the supply registers of a forced-air furnace normally located? -
ANSWER✔✔ Around the perimeter of each room, preferably in front of areas of
high heat loss.
What is the purpose of the heat exchanger in a gas-fired furnace? - ANSWER✔✔
To separate the products of combustion from the circulated air.
The typical efficiency of a gas-fired furnace is between ___% and ___%: -
ANSWER✔✔ 70-80%
How many conductors are commonly needed between the furnace and the room
thermostat? What is the magnitude of the voltage that they carry? - ANSWER✔✔
2 or 3. 24V
Which does the room thermostat control directly, the gas valve or the blower
motor? - ANSWER✔✔ Gas valve
After the thermostat contacts open, which shuts off first, the blower motor or the
gas burner? - ANSWER✔✔ Gas burner
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