Jade Carpio
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Jade Carpio
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G2 Practice Exam - Part 2

Question 1 of 50

1

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

Select one of the following:

  • True
  • False

Explanation

Question 2 of 50

1

As the number of occupants in a tightly constructed building increases, the:

Select one of the following:

  • Relative humidity increases,

  • Carbon monoxide level increases,

  • Relative humidity decreases,

  • Carbon monoxide level decreases.

Explanation

Question 3 of 50

1

The best way to remove odours from a house is to:

Select one of the following:

  • Filter the air in the house,

  • Ventilate the house,

  • Install mechanical attic ventilation,

  • Humidify the air in the house.

Explanation

Question 4 of 50

1

The main purpose of the building skin is to:

Select one of the following:

  • Protect the underlying materials,

  • Reduce heat gain,

  • Improve resistance to vapour flow,

  • Maintain the depressurization limit

Explanation

Question 5 of 50

1

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?

Select one of the following:

  • 0 square inches

  • 9 square inches

  • 18 square inches

  • 125 square inches

Explanation

Question 6 of 50

1

The most important element required for proper combustion in a gas appliance is:

Select one of the following:

  • Carbon dioxide,

  • Air,

  • Nitrogen,

  • Water vapour.

Explanation

Question 7 of 50

1

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?

Select one of the following:

  • 0%

  • 1%

  • 3%

  • 5%

Explanation

Question 8 of 50

1

Vapour barriers should be installed on:

Select one of the following:

  • The inside of the insulation,

  • The outside of the insulation,

  • The cold side of the insulation,

  • The warm side of the insulation.

Explanation

Question 9 of 50

1

What device is used to prove a dryer motor is running?

Select one of the following:

  • Motor sensor switch,

  • Motor safety switch,

  • High limit switch,

  • Centrifugal switch.

Explanation

Question 10 of 50

1

If too many lava rocks are placed in the rack of a barbeque:

Select one of the following:

  • The burner will burn out prematurely,

  • The food will cook faster,

  • The food will cook slower,

  • Delayed ignition will occur.

Explanation

Question 11 of 50

1

What is the maximum clearance from the sides of a domestic range to combustible materials, unless
otherwise specified?

Select one of the following:

  • 1 inch,

  • 3 inches,

  • 6 inches,

  • 9 inches.

Explanation

Question 12 of 50

1

How long may a corrugated flexible connector be when installed on a range?

Select one of the following:

  • 2 feet,

  • 6 feet,

  • 8 feet,

  • No maximum.

Explanation

Question 13 of 50

1

Which device shuts off the spark igniter in a spark ignition dryer after proper ignition?

Select one of the following:

  • Spark sensor,

  • Ignition sensor,

  • Limit switch,

  • Main burner switch.

Explanation

Question 14 of 50

1

What is the maximum supply pressure allowed in a single family dwelling downstream of the utility
termination?

Select one of the following:

  • 14 inches W.C.,

  • 2 psig,

  • 5 psig,

  • 20 psig.

Explanation

Question 15 of 50

1

A natural gas service regulator is normally set to deliver pressure from:

Select one of the following:

  • Pounds to 7 inches W.C.,

  • Ounces to 7 inches W.C.,

  • Pounds to 11 inches W.C.,

  • Ounces to 11 inches W.C.

Explanation

Question 16 of 50

1

The gas meter test dial can be used for:

Select one of the following:

  • Final billing purposes,

  • Checking system pressures,

  • Checking the input of an appliance,

  • Adjusting the relief setting.

Explanation

Question 17 of 50

1

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?

Select one of the following:

  • 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.

Explanation

Question 18 of 50

1

A one-half cubic foot test dial on a meter makes one revolution ever 22 seconds. Approximately how
much heat is being generated?

Select one of the following:

  • 11,000 Btuh,

  • 41,000 Btuh,

  • 60,000 Btuh,

  • 82,000 Btuh.

Explanation

Question 19 of 50

1

A pressure regulator is a device that:

Select one of the following:

  • Measures gas flow,

  • Reduces gas pressure from inlet to outlet,

  • Increases gas pressure from inlet to outlet,

  • Maintains a minimum outlet pressure.

Explanation

Question 20 of 50

1

Gas meters must be maintained in the upright position …

Select one of the following:

  • 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.

Explanation

Question 21 of 50

1

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?

Select one of the following:

  • 2

  • 3

  • 5

  • 7

Explanation

Question 22 of 50

1

When should a relief valve on a regulator operate?

Select one of the following:

  • 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.

Explanation

Question 23 of 50

1

A leak limiting device on a regulator:

Select one of the following:

  • 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.

Explanation

Question 24 of 50

1

The most accurate way to determine the amount of propane in a large storage tank is by the use of a:

Select one of the following:

  • Float gauge,

  • Pressure gauge,

  • Fixed liquid level gauge,

  • Roto gauge or slip tube gauge.

Explanation

Question 25 of 50

1

What is the maximum permitted filling density of a cylinder with liquid propane (relative density =0.51) by liquid volume?

Select one of the following:

  • 42%

  • 60%

  • 80%

  • 90%

Explanation

Question 26 of 50

1

The closing force in a gas pressure regulator is the:

Select one of the following:

  • Adjustable spring above the diaphragm,

  • Pressure downstream of the regulator,

  • Inlet pressure to the regulator,

  • Pressure drop across the regulator.

Explanation

Question 27 of 50

1

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?

Select one of the following:

  • 275 sq in

  • 300 sq in

  • 1200 sq in

  • 240 sq in

Explanation

Question 28 of 50

1

A one cubic foot test dial on a NG meter makes one revolution every 22 seconds. Approximately how many BTUH are being generated?

Select one of the following:

  • 164MBH

  • 41MBH

  • 75MBH

  • 82MBH

Explanation

Question 29 of 50

1

The closing force in a gas pressure regulator is the:

Select one of the following:

  • Adjustable spring above the diaphragm.

  • Pressure downstream of the regulator.

  • Inlet pressure to the regulator.

  • Pressure drop across the regulator.

Explanation

Question 30 of 50

1

What is the best method of adjusting and setting the pressure on an appliance regulator?

Select one of the following:

  • 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.

Explanation

Question 31 of 50

1

What are the main components of a gas-fired refrigerator?

Select one of the following:

  • generator, evaporator, radiator, absorber

  • generator, evaporator, capacitor, absorber

  • generator, evaporator, compressor absorber

  • generator, evaporator, absorber, condenser

Explanation

Question 32 of 50

1

Is it permissible to use the propane side of a refrigerator in a recreational vehicle while in the vehicle is in motion?

Select one of the following:

  • 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

Explanation

Question 33 of 50

1

Which of the following are used in an absorption refrigeration cycle?

Select one of the following:

  • a) Ammonia and helium

  • Ammonia and hydrogen

  • Ammonia and propane

  • Ammonia and butane.

Explanation

Question 34 of 50

1

What materials are approved for joining single wall vent connectors?

Select one of the following:

  • Duct tape.

  • Pop rivets.

  • Sheet metal screws.

  • Silicone or adhesive.

Explanation

Question 35 of 50

1

Net stack temperature is the flue gas temperature:

Select one of the following:

  • Downstream of the draft hood.

  • Upstream of the draft hood.

  • Plus the ambient temperature.

  • Minus the ambient temperature.

Explanation

Question 36 of 50

1

Two undesirable products of incomplete combustion are:

Select one of the following:

  • Carbon monoxide and aldehydes

  • Carbon monoxide and nitrogen.

  • Carbon dioxide and aldehydes.

  • Carbon dioxide and heat.

Explanation

Question 37 of 50

1

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?

Select one of the following:

  • 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.

Explanation

Question 38 of 50

1

How is a high limit tested on a forced warm air furnace?

Select one of the following:

  • 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.

Explanation

Question 39 of 50

1

What type of burner is used in conversion burners?

Select one of the following:

  • Ribbon burner

  • Flash burner

  • Purge burner

  • Inshot burner

Explanation

Question 40 of 50

1

What will be the result if too large a fire pot is used in a converted furnace or boiler?

Select one of the following:

  • Pulsation will occur.

  • There will be poor efficiency.

  • The limit control will be ineffective.

  • The high limit switch will open.

Explanation

Question 41 of 50

1

When the installation of an appliance constitutes a conversion from another form of energy to gas,
the installer must:

Select one of the following:

  • 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.

Explanation

Question 42 of 50

1

What is the minimum clearance to combustibles from the top of the plenum of a converted forced
warm air furnace?

Select one of the following:

  • 1”

  • 3”

  • 6”

  • 12”

Explanation

Question 43 of 50

1

Gross stack temperature is the flue gas temperature:

Select one of the following:

  • Downstream of the draft hood.

  • Upstream of the draft hood.

  • Plus the ambient temperature.

  • Minus the ambient temperature.

Explanation

Question 44 of 50

1

What is the minimum service clearance in front of a boiler?

Select one of the following:

  • 18”

  • 24”

  • 36”

  • 48”

Explanation

Question 45 of 50

1

Gross stack temperature is the flue gas temperature:

Select one of the following:

  • Downstream of the draft hood.

  • Upstream of the draft hood.

  • Plus the ambient temperature.

  • Minus the ambient temperature.

Explanation

Question 46 of 50

1

As the outlet temperature decreases from a water heater to the heating loop in a combination
heating system, the:

Select one of the following:

  • 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.

Explanation

Question 47 of 50

1

The discharge piping from the temperature and pressure relief valve on a water heater shall terminate not more than ___ From the floor.

Select one of the following:

  • 3”

  • 6”

  • 12”

  • 18”

Explanation

Question 48 of 50

1

Which of the following statements is correct concerning a combination heating system employing a
water heater to supply domestic hot water and space heating?

Select one of the following:

  • 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.

Explanation

Question 49 of 50

1

A gurgling sound coming from a firing water heater may be a symptom of:

Select one of the following:

  • Low gas pressure.

  • Overfiring.

  • Too low a water temperature, erratic temperature control.

  • A situation where deliming is required.

Explanation

Question 50 of 50

1

“Temperature rise”, when applied to a hot water heater is the:

Select one of the following:

  • 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.

Explanation

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