Title: Final Exam
Course: HET 130 Heating Residential Appliances > Section: HET 130 Heating Residential Appliances

Q: Radiant heat is transferred by ____.
- ultraviolet rays
- infrared rays
- ionization
- refraction
A: infrared rays

Q: The benefits of electric baseboard heating are that ____.
- each room can be controlled individually
- they are inexpensive to install
- they operate on a 24-V power supply
- both a and b
A: both a and b

Q: Electric baseboard heaters are classified as ____.
- natural draft convectors
- forced draft convectors
- forced draft conductors
- radiant heaters
A: natural draft convectors

Q: Any unit heater designed to have air forced across the element should not be operated without the _____ operating.
- fuse
- interlock
- element
- fan
A: fan

Q: An electric heating unit in a duct system is classified as a ____.
- natural draft convector
- forced draft convector
- forced draft conductor
- radiant heater
A: forced draft convector

Q: Technician "A" says that a fusible link can be jumped out temporarily to allow the customer to get heat until the next business day. Technician "B" says that if the fuses keep on blowing on an electric duct heater, the fan may be defective. Which of the following statements is correct?
- echnician "A" is correct. Technician "B" is correct.
- Technician "A" is correct. Technician "B" is incorrect.
- Technician "A" is incorrect. Technician "B" is correct.
- Technician "A" is incorrect. Technician "B" is incorrect.
A: Technician "A" is incorrect. Technician "B" is correct.

Q: A 10 Kw heating element, operating on rated 240 V, will have a Btu/h output of ____.
- 29,319
- 31,062
- 34,130
- 35,875
A: 34,130

Q: Most gas furnaces and appliances use a(n) ____ burner.
- compressed
- hybrid
- pressurized
- tmospheric
A: tmospheric

Q: The proper color of a gas flame is ____.
- sharp all blue
- lazy all blue
- blue with slight orange tips
- lazy with yellow tips
A: blue with slight orange tips

Q: A condensing gas furnace uses ____ from a condensing type heat exchanger to increase the furnace efficiency.
- sensible heat
- latent heat
- superheat
- subcooling
A: latent heat

Q: In a conventional gas furnace, the hot flue gases are ____.
- forced out a PVC vent with a blower
- recycled through a secondary heat exchanger and then vented through a draft diverter
- forced through a type B vent by a blower
- vented by natural convection
A: vented by natural convection

Q: Primary air adjusters on atmospheric type gas burners are usually ____.
- sliding sleeves
- spoiler screws
- all of the above
A: sliding sleeves

Q: The grade of fuel used in residential and light commercial units is ____.
- No. 1
- No. 2
- No. 4
- No. 6
A: No. 2

Q: When the oil supply is above the oil burner pump, the pump and supply would normally be a ____.
- single-stage pump, one pipe system
- single-stage pump, two pipe system
- wo-stage pump, one pipe system
- two-stage pump, two pipe system
A: single-stage pump, one pipe system

Q: A special tool has been designed to help remove and install nozzles from the burner. It is called a nozzle wrench and it ____.
- has an outer wrench that holds the burner in place, while the inner wrench holds the nozzle
- minimizes the chance of cracking the porcelain
- can only be used on semi-hollow cones
- both a and b
A: both a and b

Q: The stack switch or stack relay ____.
- starts the fan motor when the thermostat calls for heat
- shuts down the burner if it does not sense heat in the flue products
- cuts off the ignition after the flame has been established
- all of the above
A: shuts down the burner if it does not sense heat in the flue products

Q: A condensing oil furnace operates at a higher efficiency because part of the heat output is ____.
- sensible heat
- latent heat
- superheat
- sub-cooling
A: latent heat

Q: Improper combustion can lead to ____.
- excessive carbon monoxide production
- smoke condition around furnace
- wasted oil
- all of the above
A: all of the above

Q: To make combustion efficiency tests, a hole must be made ____.
- in the flue pipe after the draft control
- in the flue pipe before the draft control
- over the fire at the observation door
- under the draft hood
A: in the flue pipe before the draft control

Q: The reason for using zone valves on a hydronic heating system is to ____.
- allow different areas of the structure to maintain different temperatures
- reduce the chance of a water leak
- prevent unused parts of the house from getting warm, and wasting energy
- both a and c
A: both a and c

Q: Air in a hydronic system can cause ____.
- reduced water circulation
- increased efficiency
- corrosion
- both a and c
A: both a and c

Q: A limit control on a hot water boiler is needed to ____.
- each section of baseboard
- regulate the water in the supply line to the boiler
- balance the water flow rate in the piping system
- protect the boiler against excessive water temperatures
A: protect the boiler against excessive water temperatures

Q: An expansion joint is a device used to ____.
- prevent damage between boiler sections
- connect the expansion tank into the system
- allow for expansion and contraction of the loop piping with water temperature changes
- connect the manual vent into the system
A: allow for expansion and contraction of the loop piping with water temperature changes

Q: In a series loop hydronic heating piping system, ____.
- he heated water flows in the same direction in parallel pipes
- the heated water flows in the opposite direction in parallel pipes
- part of the heated water is directed to each terminal unit
- all the heated water flows through all the terminal units
A: all the heated water flows through all the terminal units

Q: Generally speaking, electric heat is very efficient but costs more when compared to oil and gas.
- True
- False
A: True

Q: Some units may be designed to move enough air across the heating elements so that they do not glow.
- True
- False
A: True

Q: working on an electric furnace is that there are many exposed electrical connections.
- True
- False
A: True

Q: Electric heating units provide almost instant heat. Therefore, anticipators are not needed in electric heat thermostats.
- True
- False
A: False

Q: If the number two contact on a package sequencer fails to close, the number three contact can still close
- True
- False
A: True

Q: All electric furnaces use package sequencers.
- True
- False
A: False

Q: Liquified petroleum (LP) is heavier than air and can cause suffocation if not handled properly.
- True
- False
A: True

Q: A gas furnace designed for use with natural gas can be used with liquified petroleum (LP) with no system modifications.
- True
- False
A: False

Q: In the USA, natural gas suppliers supply gas with a heat content of about 1,050 Btu/cu. ft.
- True
- False
A: True

Q: If flue gases are not vented properly, carbon monoxide poisoning could result.
- True
- False
A: True

Q: The gas flame will lift off the burner and be noisy if it receives too much primary air.
- True
- False
A: True

Q: After several seasons, buried oil tanks are very subject to water under the oil.
- True
- False
A: True

Q: Tanks that are to be installed underground must be protected against corrosion.
- True
- False
A: True

Q: Tank piping should be inspected regularly for imperfections and leaks.
- True
- False
A: True

Q: In a single-stage fuel oil pump, the oil is fed to the burner by capillary action.
- True
- False
A: False

Q: Oil burner nozzles are designed and rated at 100 psig nozzle pressure.
- True
- False
A: True

Q: Nozzles can be cleaned to remove any carbonization by using a very fine wire brush.
- True
- False
A: False

Q: The more sections a boiler has, the higher its capacity will be.
- True
- False
A: True

Q: Expansion tanks must always be bled from the top until all of the air is removed from it.
- True
- False
A: False

Q: Hydronic heat circulators are centrifugal pumps.
- True
- False
A: True

Q: Automatic air vents rely on an internal disc that swells when water is sensed.
- True
- False
A: True

Q: It is possible for a hydronic system with many zones to operate with one circulating pump.
- True
- False
A: True

Q: The only place a bleed valve is needed is on top of the boiler.
- True
- False
A: False

Q: In a series loop, the water going through the last terminal unit will be the same temperature as the water through the first terminal unit.
- True
- False
A: False

Q: A tankless domestic water system provides hot water from a coil in the boiler.
- True
- False
A: True