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Gas practice appliances

Description

English Quiz on Gas practice appliances , created by randy loye on 02/06/2018.
randy loye
Quiz by randy loye, updated more than 1 year ago
randy loye
Created by randy loye almost 6 years ago
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Resource summary

Question 1

Question
What are two inert gasses
Answer
  • Carbon monoxide and Aldehydes
  • CO2 and Hydrogen
  • Carbon Monoxide and Nitrogen
  • Carbon Dioxide and Nitrogen

Question 2

Question
What are two products of incomplete combustion
Answer
  • Carbon dioxide and Nitrogen
  • Hydrogen and carbon
  • Carbon monoxide and Aldehydes
  • Nitrogen and Aldehydes

Question 3

Question
In an induced draft burner the fan is
Answer
  • upstream
  • downstream
  • forced draft burner
  • fans are up and down stream

Question 4

Question
In a forced draft burner the fan is
Answer
  • downstream
  • upstream
  • balanced both down and up stream
  • in the combustion chamber

Question 5

Question
In a balanced draft burner the fan is
Answer
  • downstream
  • both up and downstream
  • upstream
  • is beside the damper

Question 6

Question
A bi-metal strip is
Answer
  • 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
  • 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
  • two pieces of metal use for thermostat sensing

Question 7

Question
A thermistor is
Answer
  • a thermostat
  • a rod and tube device used in water heaters
  • a device used to measure room temperature and regulate electrical flow to equipment control's circuit
  • used to measure the overheating of an appliance

Question 8

Question
A capillary is
Answer
  • a device used to measure flow rate of appliance
  • 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
  • a device that operates like a pressure relief vale for water
  • a device heat value in gas appliances through a glass tube at the end of the device

Question 9

Question
A rod and tube
Answer
  • is two different metals used in hot water tanks to measure pressure and temperature
  • is used as a circuit when the temperate rises it activates an electrical circuit
  • is a device used as a gas line in some cases
  • 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

Question 10

Question
A thermocouple
Answer
  • is a device used in conjunction with thermostat to measure heat
  • is used in combustion systems to send moisture information and flue gas reading back to main control board
  • is used as a safety device as it measures flames in constant pilot and manual reset control devices
  • shut the system off if there is no gas to the burner

Question 11

Question
An operating aquastat is
Answer
  • a safety device that measure if water levels high or low
  • is a device that pumps water when a demand is sent
  • 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
  • a device that activates in response to water change . it is a normally closed switch that controls temperature of water inside the boiler

Question 12

Question
A combination high limit/fan control is used to
Answer
  • control the speed of the fan for saftey
  • sense flue gas spillage for safety
  • sense air temperature for saftey
  • senses flow of flue gas through pressure switch

Question 13

Question
The combination high limit/fan control is a
Answer
  • normally closed switch with a bi metal strip
  • a normally open fan switch with a rod and tube
  • a normally open fan switch with on the left and a normally closed high limit switch on the right
  • a normally open high limit switch on the right and a normally closed fan switch on the left

Question 14

Question
An operating pressure switch
Answer
  • actuates in the response of high pressure flue gas temperatures
  • actuates in responce of high temperature in the furnace
  • actuates in response of change of water, steam, air and gas pressure
  • actuates in response clogged flue pipe

Question 15

Question
Operating pressure witches are used on
Answer
  • AC units and refrigerators
  • steam boilers. water boilers and combustion burners for gas burners
  • all gas appliances

Question 16

Question
An operating pressure switch operates by
Answer
  • releasing steam pressure from the tank as steam rises
  • detects steam pressure and turns off gas to main burner
  • releasing steam pressure from the tank as water rises
  • the switch contacts close and energizes a vent motor to release pressure

Question 17

Question
An air flow switch
Answer
  • detects dilution air flow
  • ensures air flow such as flu gasses is bring properly vented with differential air flow
  • ensures that primary, secondary and excesses air is being sent
  • ensures there is no differential air flow

Question 18

Question
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.
Answer
  • True
  • False

Question 19

Question
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
Answer
  • True
  • False

Question 20

Question
What takes place in a heat exchange in a forced air furnace
Answer
  • the flue gasses are stored
  • gas and air are mixed
  • the combustion process takes place
  • return air is heated

Question 21

Question
inferred haters may not be used in
Answer
  • factories
  • residential
  • warehouses
  • loading docks

Question 22

Question
Th purpose of a burner in a forced air furnace is to
Answer
  • supply heat directly to the air in the building
  • heat the combustion air so that the air is lighter to allow it to flow out the exhaust
  • mix the air and gas
  • ignite the gas

Question 23

Question
Atmospheric burners are design to operate under
Answer
  • high air pressure with low gas pressure
  • normal atmospheric pressure with low gas pressure
  • atmospheric pressure with high gas pressure
  • compressed air pressure with high gas pressure

Question 24

Question
On a roof with a 12/12 pitch and no obstructions the min vent height for a natural gas appliance is
Answer
  • 2'
  • 4'
  • 10'
  • 6'

Question 25

Question
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
Answer
  • 6'
  • 2'
  • 3'
  • 10'

Question 26

Question
Witch term is used to described the natural draft of the chimney measurements at or near the base of the chimney
Answer
  • static pressure draft
  • neutral pressure point draft
  • base pressure draft
  • chimney draft

Question 27

Question
A damper is a
Answer
  • device used to keep the gasket moist and malleable
  • plate or valve for regulating the flow of air or flue gas
  • device used to cool and divert flue gasses
  • fixed flue gas diverter

Question 28

Question
Which of the following is an appliance draft control device
Answer
  • a baffle used to control air to a burner
  • a control used to control air for combustion
  • a draft hood or draft regulator
  • a variable damper in the circulating air supply system

Question 29

Question
Which burner supplies combustion air at sufficient pressure to overcome the resistance of the burner only
Answer
  • power burner
  • combustion burner
  • forced draft burner
  • fan assisted burner

Question 30

Question
What is the name of the device that is installed either internally or eternally to a venting system to extract heat from flue gasses
Answer
  • draft hood
  • heat reclaimer
  • draft control device
  • heat diverter

Question 31

Question
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
Answer
  • forced draft burner
  • high pressure burner
  • fan assisted burner
  • mechanical draft burner

Question 32

Question
Which type of appliance has the combustion products or the flue gasses mixed with the medium being heated
Answer
  • direct fired appliance
  • space heater
  • immersion appliance
  • indirect fired appliance

Question 33

Question
Which type of appliance does not have flue gasses mixed with the medium being heated
Answer
  • direct fired appliance
  • non vented appliance
  • immersion appliance
  • indirect fired appliance

Question 34

Question
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
Answer
  • direct vented appliance
  • indoor/outdoor appliances
  • indirect fired appliance
  • direct vent appliance

Question 35

Question
An A vent is
Answer
  • double wall vent with aluminum inside used for main vertical shaft or vent connector
  • steel of masonry chimney
  • double wall with stainless steel inside
  • single thickness of galvanized or aluminum

Question 36

Question
A B vent is
Answer
  • a steel or masonry chimney
  • a double wall with stainless inside
  • a double wall with aluminum inside
  • double wall with (oval) aluminum inside

Question 37

Question
A L vent is a
Answer
  • double wall with stainless inside
  • a single thickness aluminium or galvanized
  • steel or masonry
  • venting system under positive pressure

Question 38

Question
A BW vent is a
Answer
  • a single galvanized or stainless
  • double wall with stainless inside
  • double wall (oval) with aluminum inside
  • used for venting systems with positive pressure

Question 39

Question
A C vent is a
Answer
  • double wall with stainless inside
  • a single thickness galvanized or stainless
  • double wall (oval) inside with aluminum inside
  • used for vent with positive pressure

Question 40

Question
A BH vent is
Answer
  • single thickness wall of galvanized or stainless
  • double wall with stainless inside
  • double wall (oval) inside with aluminum inside
  • venting system under positive pressure

Question 41

Question
For venting BH schedule 40 Thermal plastic PVC/CPVC is used
Answer
  • True
  • False

Question 42

Question
Three types of thermostats are direct line voltage 120v, 24v and 740ma
Answer
  • True
  • False

Question 43

Question
Schedule 40 PVC 636 can be used for temperatures up to 60 C/149 F to
Answer
  • True
  • False

Question 44

Question
CPVC can be used up to and including 90C/194F
Answer
  • True
  • False

Question 45

Question
The cause of a yellow tipping flame is
Answer
  • the secondary air is reduced
  • the primary air is reduced
  • to much primary air
  • too much dilution air

Question 46

Question
The bunsen flame or blue flame is is the result of
Answer
  • no premixing of air
  • perfect secondary air
  • some premixing of primary air
  • no excess air

Question 47

Question
Three types of orifices are Fixed, adjustable and universal
Answer
  • True
  • False

Question 48

Question
Min and max orifice sizes are
Answer
  • 28-32 drill
  • 29-36 drill
  • 29-42 drill
  • 29-40 drill

Question 49

Question
Using ohms law what reading would be giving if each end of the switch was measures
Image:
Slide 22 (binary/octet-stream)
Answer
  • Reading would be 0 or OL
  • reading would be measurable

Question 50

Question
Using ohms what reading would be shown on the meter if measurement was taken before and after a load
Image:
í ¬ê¸°ë³€í™˜ °íÁ¤ ÀúÇ× Hisageness (binary/octet-stream)
Answer
  • Infinity (00)
  • measurable

Question 51

Question
Most common used wire is romex 14/2
Answer
  • True
  • False

Question 52

Question
What does NMD stand for
Answer
  • Non metal dirt resistant
  • Non metal dry
  • Non more drop
  • Non move drip
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