14030211
Descripción
Test por randy loye, actualizado hace más de 1 año
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Creado por randy loye
hace alrededor de 6 años
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Pregunta 1
Pregunta
What are two inert gasses
Respuesta
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Carbon monoxide and Aldehydes
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CO2 and Hydrogen
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Carbon Monoxide and Nitrogen
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Carbon Dioxide and Nitrogen
Pregunta 2
Pregunta
What are two products of incomplete combustion
Respuesta
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Carbon dioxide and Nitrogen
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Hydrogen and carbon
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Carbon monoxide and Aldehydes
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Nitrogen and Aldehydes
Pregunta 3
Pregunta
In an induced draft burner the fan is
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upstream
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downstream
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forced draft burner
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fans are up and down stream
Pregunta 4
Pregunta
In a forced draft burner the fan is
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downstream
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upstream
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balanced both down and up stream
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in the combustion chamber
Pregunta 5
Pregunta
In a balanced draft burner the fan is
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downstream
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both up and downstream
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upstream
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is beside the damper
Pregunta 6
Pregunta
A bi-metal strip is
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two strips of separate metal that have the same temperature when heated causes them to curve and is used to control and open an electrical circuit
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is two strips of metal welded together with different coefficients temperatures when heated causes them to curve and is used to control and open an electrical circuit
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two pieces of metal use for thermostat sensing
Pregunta 7
Pregunta
A thermistor is
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a thermostat
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a rod and tube device used in water heaters
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a device used to measure room temperature and regulate electrical flow to equipment control's circuit
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used to measure the overheating of an appliance
Pregunta 8
Pregunta
A capillary is
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a device used to measure flow rate of appliance
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a spring loaded device used operate electrical switches to open or close gas ports. it has a glass bulb at the end that reacts to preasure
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a device that operates like a pressure relief vale for water
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a device heat value in gas appliances through a glass tube at the end of the device
Pregunta 9
Pregunta
A rod and tube
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is two different metals used in hot water tanks to measure pressure and temperature
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is used as a circuit when the temperate rises it activates an electrical circuit
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is a device used as a gas line in some cases
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is two different metals places inside one another which is used as a thermostat and when heated activates a electrical switch or gas valve port
Pregunta 10
Pregunta
A thermocouple
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is a device used in conjunction with thermostat to measure heat
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is used in combustion systems to send moisture information and flue gas reading back to main control board
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is used as a safety device as it measures flames in constant pilot and manual reset control devices
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shut the system off if there is no gas to the burner
Pregunta 11
Pregunta
An operating aquastat is
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a safety device that measure if water levels high or low
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is a device that pumps water when a demand is sent
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is a a device that activates in response to water change. it is a normally open switch that will open when water reaches desired temperature inside the boiler
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a device that activates in response to water change . it is a normally closed switch that controls temperature of water inside the boiler
Pregunta 12
Pregunta
A combination high limit/fan control is used to
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control the speed of the fan for saftey
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sense flue gas spillage for safety
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sense air temperature for saftey
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senses flow of flue gas through pressure switch
Pregunta 13
Pregunta
The combination high limit/fan control is a
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normally closed switch with a bi metal strip
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a normally open fan switch with a rod and tube
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a normally open fan switch with on the left and a normally closed high limit switch on the right
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a normally open high limit switch on the right and a normally closed fan switch on the left
Pregunta 14
Pregunta
An operating pressure switch
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actuates in the response of high pressure flue gas temperatures
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actuates in responce of high temperature in the furnace
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actuates in response of change of water, steam, air and gas pressure
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actuates in response clogged flue pipe
Pregunta 15
Pregunta
Operating pressure witches are used on
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AC units and refrigerators
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steam boilers. water boilers and combustion burners for gas burners
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all gas appliances
Pregunta 16
Pregunta
An operating pressure switch operates by
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releasing steam pressure from the tank as steam rises
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detects steam pressure and turns off gas to main burner
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releasing steam pressure from the tank as water rises
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the switch contacts close and energizes a vent motor to release pressure
Pregunta 17
Pregunta
An air flow switch
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detects dilution air flow
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ensures air flow such as flu gasses is bring properly vented with differential air flow
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ensures that primary, secondary and excesses air is being sent
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ensures there is no differential air flow
Pregunta 18
Pregunta
A flame roll out switch is a high temperature limit switch wired to the burner ignition control. If the flame roll out is sensed the witch is opened and fe-energizes the gas valve.
Respuesta
- True
- False
Pregunta 19
Pregunta
When furnaces are equipped with draft hoods, they may be equipped with a shut off system that automatically cuts out the main burner when the vent is blocked. These are refereed commonly and incorrectly reffed to as spill switches
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- True
- False
Pregunta 20
Pregunta
What takes place in a heat exchange in a forced air furnace
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the flue gasses are stored
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gas and air are mixed
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the combustion process takes place
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return air is heated
Pregunta 21
Pregunta
inferred haters may not be used in
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factories
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residential
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warehouses
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loading docks
Pregunta 22
Pregunta
Th purpose of a burner in a forced air furnace is to
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supply heat directly to the air in the building
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heat the combustion air so that the air is lighter to allow it to flow out the exhaust
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mix the air and gas
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ignite the gas
Pregunta 23
Pregunta
Atmospheric burners are design to operate under
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high air pressure with low gas pressure
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normal atmospheric pressure with low gas pressure
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atmospheric pressure with high gas pressure
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compressed air pressure with high gas pressure
Pregunta 24
Pregunta
On a roof with a 12/12 pitch and no obstructions the min vent height for a natural gas appliance is
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2'
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4'
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10'
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6'
Pregunta 25
Pregunta
On a roof with a 10/12 pitch and a wall 4' high and 6 feet away from the vent opening, what is the minimum height fora category one propane appliance
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6'
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2'
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3'
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10'
Pregunta 26
Pregunta
Witch term is used to described the natural draft of the chimney measurements at or near the base of the chimney
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static pressure draft
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neutral pressure point draft
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base pressure draft
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chimney draft
Pregunta 27
Pregunta
A damper is a
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device used to keep the gasket moist and malleable
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plate or valve for regulating the flow of air or flue gas
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device used to cool and divert flue gasses
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fixed flue gas diverter
Pregunta 28
Pregunta
Which of the following is an appliance draft control device
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a baffle used to control air to a burner
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a control used to control air for combustion
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a draft hood or draft regulator
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a variable damper in the circulating air supply system
Pregunta 29
Pregunta
Which burner supplies combustion air at sufficient pressure to overcome the resistance of the burner only
Respuesta
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power burner
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combustion burner
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forced draft burner
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fan assisted burner
Pregunta 30
Pregunta
What is the name of the device that is installed either internally or eternally to a venting system to extract heat from flue gasses
Respuesta
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draft hood
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heat reclaimer
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draft control device
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heat diverter
Pregunta 31
Pregunta
Which burner supplies combustion air with a mechanical device such as a fan or blower at sufficient pressure to overcome resistance of the burner at the appliance
Respuesta
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forced draft burner
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high pressure burner
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fan assisted burner
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mechanical draft burner
Pregunta 32
Pregunta
Which type of appliance has the combustion products or the flue gasses mixed with the medium being heated
Respuesta
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direct fired appliance
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space heater
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immersion appliance
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indirect fired appliance
Pregunta 33
Pregunta
Which type of appliance does not have flue gasses mixed with the medium being heated
Respuesta
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direct fired appliance
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non vented appliance
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immersion appliance
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indirect fired appliance
Pregunta 34
Pregunta
Which appliance is constructed so that all the combustion air is supplied directly from and the products of combustion are vented directly to the outdoors by independent passageways connected directly to the appliance
Respuesta
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direct vented appliance
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indoor/outdoor appliances
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indirect fired appliance
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direct vent appliance
Pregunta 35
Pregunta
An A vent is
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double wall vent with aluminum inside used for main vertical shaft or vent connector
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steel of masonry chimney
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double wall with stainless steel inside
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single thickness of galvanized or aluminum
Pregunta 36
Pregunta
A B vent is
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a steel or masonry chimney
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a double wall with stainless inside
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a double wall with aluminum inside
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double wall with (oval) aluminum inside
Pregunta 37
Pregunta
A L vent is a
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double wall with stainless inside
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a single thickness aluminium or galvanized
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steel or masonry
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venting system under positive pressure
Pregunta 38
Pregunta
A BW vent is a
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a single galvanized or stainless
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double wall with stainless inside
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double wall (oval) with aluminum inside
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used for venting systems with positive pressure
Pregunta 39
Pregunta
A C vent is a
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double wall with stainless inside
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a single thickness galvanized or stainless
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double wall (oval) inside with aluminum inside
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used for vent with positive pressure
Pregunta 40
Pregunta
A BH vent is
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single thickness wall of galvanized or stainless
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double wall with stainless inside
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double wall (oval) inside with aluminum inside
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venting system under positive pressure
Pregunta 41
Pregunta
For venting BH schedule 40 Thermal plastic PVC/CPVC is used
Respuesta
- True
- False
Pregunta 42
Pregunta
Three types of thermostats are direct line voltage 120v, 24v and 740ma
Respuesta
- True
- False
Pregunta 43
Pregunta
Schedule 40 PVC 636 can be used for temperatures up to 60 C/149 F to
Respuesta
- True
- False
Pregunta 44
Pregunta
CPVC can be used up to and including 90C/194F
Respuesta
- True
- False
Pregunta 45
Pregunta
The cause of a yellow tipping flame is
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the secondary air is reduced
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the primary air is reduced
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to much primary air
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too much dilution air
Pregunta 46
Pregunta
The bunsen flame or blue flame is is the result of
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no premixing of air
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perfect secondary air
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some premixing of primary air
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no excess air
Pregunta 47
Pregunta
Three types of orifices are Fixed, adjustable and universal
Respuesta
- True
- False
Pregunta 48
Pregunta
Min and max orifice sizes are
Respuesta
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28-32 drill
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29-36 drill
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29-42 drill
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29-40 drill
Pregunta 49
Pregunta
Using ohms law what reading would be giving if each end of the switch was measures
Respuesta
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Reading would be 0 or OL
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reading would be measurable
Pregunta 50
Pregunta
Using ohms what reading would be shown on the meter if measurement was taken before and after a load
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Infinity (00)
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measurable
Pregunta 51
Pregunta
Most common used wire is romex 14/2
Respuesta
- True
- False
Pregunta 52
Pregunta
What does NMD stand for
Respuesta
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Non metal dirt resistant
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Non metal dry
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Non more drop
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Non move drip
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