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G2 Practice Exam - Part 2

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Jade Carpio
Quiz by Jade Carpio, updated more than 1 year ago
Jade Carpio
Created by Jade Carpio about 8 years ago
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Resource summary

Question 1

Question
If the relative humidity of a room is increased, the temperature in the room must be increase to maintain the same level of comfort.
Answer
  • True
  • False

Question 2

Question
As the number of occupants in a tightly constructed building increases, the:
Answer
  • Relative humidity increases,
  • Carbon monoxide level increases,
  • Relative humidity decreases,
  • Carbon monoxide level decreases.

Question 3

Question
The best way to remove odours from a house is to:
Answer
  • Filter the air in the house,
  • Ventilate the house,
  • Install mechanical attic ventilation,
  • Humidify the air in the house.

Question 4

Question
The main purpose of the building skin is to:
Answer
  • Protect the underlying materials,
  • Reduce heat gain,
  • Improve resistance to vapour flow,
  • Maintain the depressurization limit

Question 5

Question
There is a new forced air furnace equipped with an induced draft fan beside a conventional water heater in a basement. The customer has decided to enclose the area to make a separate furnace room. The house is approximately 25 years old and has a door separating the basement from the upper levels. Furnace input is 100,000Btuh with AWH input of 25,000 Btuh. The enclosure is 10ft x 20ft x 7ft. The structure dimensions are 20ft x 30ft x 7ft x 3 levels. What size opening will be required in the furnace room door for combustion air?
Answer
  • 0 square inches
  • 9 square inches
  • 18 square inches
  • 125 square inches

Question 6

Question
The most important element required for proper combustion in a gas appliance is:
Answer
  • Carbon dioxide,
  • Air,
  • Nitrogen,
  • Water vapour.

Question 7

Question
When a baffle is required to prevent the direct entry of rain into an air supply opening, by how much can the baffle reduce the required free area of the opening?
Answer
  • 0%
  • 1%
  • 3%
  • 5%

Question 8

Question
Vapour barriers should be installed on:
Answer
  • The inside of the insulation,
  • The outside of the insulation,
  • The cold side of the insulation,
  • The warm side of the insulation.

Question 9

Question
What device is used to prove a dryer motor is running?
Answer
  • Motor sensor switch,
  • Motor safety switch,
  • High limit switch,
  • Centrifugal switch.

Question 10

Question
If too many lava rocks are placed in the rack of a barbeque:
Answer
  • The burner will burn out prematurely,
  • The food will cook faster,
  • The food will cook slower,
  • Delayed ignition will occur.

Question 11

Question
What is the maximum clearance from the sides of a domestic range to combustible materials, unless otherwise specified?
Answer
  • 1 inch,
  • 3 inches,
  • 6 inches,
  • 9 inches.

Question 12

Question
How long may a corrugated flexible connector be when installed on a range?
Answer
  • 2 feet,
  • 6 feet,
  • 8 feet,
  • No maximum.

Question 13

Question
Which device shuts off the spark igniter in a spark ignition dryer after proper ignition?
Answer
  • Spark sensor,
  • Ignition sensor,
  • Limit switch,
  • Main burner switch.

Question 14

Question
What is the maximum supply pressure allowed in a single family dwelling downstream of the utility termination?
Answer
  • 14 inches W.C.,
  • 2 psig,
  • 5 psig,
  • 20 psig.

Question 15

Question
A natural gas service regulator is normally set to deliver pressure from:
Answer
  • Pounds to 7 inches W.C.,
  • Ounces to 7 inches W.C.,
  • Pounds to 11 inches W.C.,
  • Ounces to 11 inches W.C.

Question 16

Question
The gas meter test dial can be used for:
Answer
  • Final billing purposes,
  • Checking system pressures,
  • Checking the input of an appliance,
  • Adjusting the relief setting.

Question 17

Question
Can a shut-off valve be installed upstream of a relief valve to allow for the removal of the relief valve for servicing without having to empty the contents of a tank?
Answer
  • No,
  • No, unless the thank is less than 1,000 USWG,
  • Only if it is installed by a certified propane technician,
  • Only with the permission of the propane company.

Question 18

Question
A one-half cubic foot test dial on a meter makes one revolution ever 22 seconds. Approximately how much heat is being generated?
Answer
  • 11,000 Btuh,
  • 41,000 Btuh,
  • 60,000 Btuh,
  • 82,000 Btuh.

Question 19

Question
A pressure regulator is a device that:
Answer
  • Measures gas flow,
  • Reduces gas pressure from inlet to outlet,
  • Increases gas pressure from inlet to outlet,
  • Maintains a minimum outlet pressure.

Question 20

Question
Gas meters must be maintained in the upright position …
Answer
  • While being moved into position,
  • While being transported only,
  • At all times, including when connected for service,
  • At all times except when connect for service. Meters must be kept upright at all times or they will cease to function properly.

Question 21

Question
When propane is to be used in the construction repair or improvement of a building, how many 100lb cylinders may be manifolded together and used indoors?
Answer
  • 2
  • 3
  • 5
  • 7

Question 22

Question
When should a relief valve on a regulator operate?
Answer
  • When the system pressure falls below the regulator set point,
  • When it senses pressure at 4 times the regulator set point,
  • When there is excessive pressure in the supply piping,
  • Where the inlet pressure drops below set point.

Question 23

Question
A leak limiting device on a regulator:
Answer
  • Allows a controlled, safe amount of leakage if the diaphragm ruptures,
  • Shuts off completely if the diaphragm ruptures,
  • Routes all leaking gas back into piping system if the diaphragm ruptures,
  • Shuts off all pilot lights if the diaphragm ruptures.

Question 24

Question
The most accurate way to determine the amount of propane in a large storage tank is by the use of a:
Answer
  • Float gauge,
  • Pressure gauge,
  • Fixed liquid level gauge,
  • Roto gauge or slip tube gauge.

Question 25

Question
What is the maximum permitted filling density of a cylinder with liquid propane (relative density =0.51) by liquid volume?
Answer
  • 42%
  • 60%
  • 80%
  • 90%

Question 26

Question
The closing force in a gas pressure regulator is the:
Answer
  • Adjustable spring above the diaphragm,
  • Pressure downstream of the regulator,
  • Inlet pressure to the regulator,
  • Pressure drop across the regulator.

Question 27

Question
3 hot water boilers each firing at 500MBH, 2 hot water heaters each firing at 270MBH and 1 domestic hot water heater firing at 30MBH. Consider the grill to have 80% free air space. What size should the grill be?
Answer
  • 275 sq in
  • 300 sq in
  • 1200 sq in
  • 240 sq in

Question 28

Question
A one cubic foot test dial on a NG meter makes one revolution every 22 seconds. Approximately how many BTUH are being generated?
Answer
  • 164MBH
  • 41MBH
  • 75MBH
  • 82MBH

Question 29

Question
The closing force in a gas pressure regulator is the:
Answer
  • Adjustable spring above the diaphragm.
  • Pressure downstream of the regulator.
  • Inlet pressure to the regulator.
  • Pressure drop across the regulator.

Question 30

Question
What is the best method of adjusting and setting the pressure on an appliance regulator?
Answer
  • Adjust the regulator set point by observing the appliance flame.
  • Adjusting the regulator set point using a manometer to the appliance rating.
  • Adjusting the regulator set point to within 10% above the appliance rating.
  • Adjusting the regulator set point to within 10% below the appliance rating.

Question 31

Question
What are the main components of a gas-fired refrigerator?
Answer
  • generator, evaporator, radiator, absorber
  • generator, evaporator, capacitor, absorber
  • generator, evaporator, compressor absorber
  • generator, evaporator, absorber, condenser

Question 32

Question
Is it permissible to use the propane side of a refrigerator in a recreational vehicle while in the vehicle is in motion?
Answer
  • No
  • No, unless the vehicle is only being moved to a more level location.
  • Yes
  • Yes, if the vehicle is being moved 1 mile or less

Question 33

Question
Which of the following are used in an absorption refrigeration cycle?
Answer
  • a) Ammonia and helium
  • Ammonia and hydrogen
  • Ammonia and propane
  • Ammonia and butane.

Question 34

Question
What materials are approved for joining single wall vent connectors?
Answer
  • Duct tape.
  • Pop rivets.
  • Sheet metal screws.
  • Silicone or adhesive.

Question 35

Question
Net stack temperature is the flue gas temperature:
Answer
  • Downstream of the draft hood.
  • Upstream of the draft hood.
  • Plus the ambient temperature.
  • Minus the ambient temperature.

Question 36

Question
Two undesirable products of incomplete combustion are:
Answer
  • Carbon monoxide and aldehydes
  • Carbon monoxide and nitrogen.
  • Carbon dioxide and aldehydes.
  • Carbon dioxide and heat.

Question 37

Question
When using a flue gas analyser which measures CO2 and you are in doubt as to the accuracy of the reading, how would you verify the accuracy of the instrument?
Answer
  • By comparing it to a second sample.
  • By comparing it to a known sample.
  • By checking it against the gas meter test dial.
  • By checking it against the appliance manufacturers maximum input rating.

Question 38

Question
How is a high limit tested on a forced warm air furnace?
Answer
  • By disconnecting the air circulating blower.
  • By disconnecting the wire to the limit control.
  • By disconnecting one wire on the thermostat when the furnace is warm.
  • By shutting off the gas control so that the furnace will cool down.

Question 39

Question
What type of burner is used in conversion burners?
Answer
  • Ribbon burner
  • Flash burner
  • Purge burner
  • Inshot burner

Question 40

Question
What will be the result if too large a fire pot is used in a converted furnace or boiler?
Answer
  • Pulsation will occur.
  • There will be poor efficiency.
  • The limit control will be ineffective.
  • The high limit switch will open.

Question 41

Question
When the installation of an appliance constitutes a conversion from another form of energy to gas, the installer must:
Answer
  • Advise the user in writing of the procedures to be followed to discontinue the supply of the former form of energy.
  • Remove all aspects of the previous installation.
  • Remove the electrical supply wiring from the panel.
  • Advise the previous energy supplier of the change.

Question 42

Question
What is the minimum clearance to combustibles from the top of the plenum of a converted forced warm air furnace?
Answer
  • 1”
  • 3”
  • 6”
  • 12”

Question 43

Question
Gross stack temperature is the flue gas temperature:
Answer
  • Downstream of the draft hood.
  • Upstream of the draft hood.
  • Plus the ambient temperature.
  • Minus the ambient temperature.

Question 44

Question
What is the minimum service clearance in front of a boiler?
Answer
  • 18”
  • 24”
  • 36”
  • 48”

Question 45

Question
Gross stack temperature is the flue gas temperature:
Answer
  • Downstream of the draft hood.
  • Upstream of the draft hood.
  • Plus the ambient temperature.
  • Minus the ambient temperature.

Question 46

Question
As the outlet temperature decreases from a water heater to the heating loop in a combination heating system, the:
Answer
  • Heating output from the air handler decreases.
  • Heating output from the air handler increases.
  • Rate of heat transfer from the water to the air increases.
  • Greater the temperature drop through the heating loop.

Question 47

Question
The discharge piping from the temperature and pressure relief valve on a water heater shall terminate not more than ___ From the floor.
Answer
  • 3”
  • 6”
  • 12”
  • 18”

Question 48

Question
Which of the following statements is correct concerning a combination heating system employing a water heater to supply domestic hot water and space heating?
Answer
  • An air handler can be concealed in a space just like ductwork.
  • Check valves must be installed in both the supply and return line of the heating loop.
  • The T&P valve must be removed from the water heater.
  • Isolation valves should be installed in both the supply and return line of the heating loop.

Question 49

Question
A gurgling sound coming from a firing water heater may be a symptom of:
Answer
  • Low gas pressure.
  • Overfiring.
  • Too low a water temperature, erratic temperature control.
  • A situation where deliming is required.

Question 50

Question
“Temperature rise”, when applied to a hot water heater is the:
Answer
  • Difference between outdoor temperature and the flue gas temperature.
  • Water temperature difference across the heater.
  • Temperature difference between the bottom and top of the heater.
  • Height of the hot water piping system.
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