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G2 Practice Exam - Part 2

Frage 1 von 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.

Wähle eins der folgenden:

  • WAHR
  • FALSCH

Erklärung

Frage 2 von 50

1

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

Wähle eine der folgenden:

  • Relative humidity increases,

  • Carbon monoxide level increases,

  • Relative humidity decreases,

  • Carbon monoxide level decreases.

Erklärung

Frage 3 von 50

1

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

Wähle eine der folgenden:

  • Filter the air in the house,

  • Ventilate the house,

  • Install mechanical attic ventilation,

  • Humidify the air in the house.

Erklärung

Frage 4 von 50

1

The main purpose of the building skin is to:

Wähle eine der folgenden:

  • Protect the underlying materials,

  • Reduce heat gain,

  • Improve resistance to vapour flow,

  • Maintain the depressurization limit

Erklärung

Frage 5 von 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?

Wähle eine der folgenden:

  • 0 square inches

  • 9 square inches

  • 18 square inches

  • 125 square inches

Erklärung

Frage 6 von 50

1

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

Wähle eine der folgenden:

  • Carbon dioxide,

  • Air,

  • Nitrogen,

  • Water vapour.

Erklärung

Frage 7 von 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?

Wähle eine der folgenden:

  • 0%

  • 1%

  • 3%

  • 5%

Erklärung

Frage 8 von 50

1

Vapour barriers should be installed on:

Wähle eine der folgenden:

  • The inside of the insulation,

  • The outside of the insulation,

  • The cold side of the insulation,

  • The warm side of the insulation.

Erklärung

Frage 9 von 50

1

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

Wähle eine der folgenden:

  • Motor sensor switch,

  • Motor safety switch,

  • High limit switch,

  • Centrifugal switch.

Erklärung

Frage 10 von 50

1

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

Wähle eine der folgenden:

  • The burner will burn out prematurely,

  • The food will cook faster,

  • The food will cook slower,

  • Delayed ignition will occur.

Erklärung

Frage 11 von 50

1

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

Wähle eine der folgenden:

  • 1 inch,

  • 3 inches,

  • 6 inches,

  • 9 inches.

Erklärung

Frage 12 von 50

1

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

Wähle eine der folgenden:

  • 2 feet,

  • 6 feet,

  • 8 feet,

  • No maximum.

Erklärung

Frage 13 von 50

1

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

Wähle eine der folgenden:

  • Spark sensor,

  • Ignition sensor,

  • Limit switch,

  • Main burner switch.

Erklärung

Frage 14 von 50

1

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

Wähle eine der folgenden:

  • 14 inches W.C.,

  • 2 psig,

  • 5 psig,

  • 20 psig.

Erklärung

Frage 15 von 50

1

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

Wähle eine der folgenden:

  • Pounds to 7 inches W.C.,

  • Ounces to 7 inches W.C.,

  • Pounds to 11 inches W.C.,

  • Ounces to 11 inches W.C.

Erklärung

Frage 16 von 50

1

The gas meter test dial can be used for:

Wähle eine der folgenden:

  • Final billing purposes,

  • Checking system pressures,

  • Checking the input of an appliance,

  • Adjusting the relief setting.

Erklärung

Frage 17 von 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?

Wähle eine der folgenden:

  • 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.

Erklärung

Frage 18 von 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?

Wähle eine der folgenden:

  • 11,000 Btuh,

  • 41,000 Btuh,

  • 60,000 Btuh,

  • 82,000 Btuh.

Erklärung

Frage 19 von 50

1

A pressure regulator is a device that:

Wähle eine der folgenden:

  • Measures gas flow,

  • Reduces gas pressure from inlet to outlet,

  • Increases gas pressure from inlet to outlet,

  • Maintains a minimum outlet pressure.

Erklärung

Frage 20 von 50

1

Gas meters must be maintained in the upright position …

Wähle eine der folgenden:

  • 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.

Erklärung

Frage 21 von 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?

Wähle eine der folgenden:

  • 2

  • 3

  • 5

  • 7

Erklärung

Frage 22 von 50

1

When should a relief valve on a regulator operate?

Wähle eine der folgenden:

  • 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.

Erklärung

Frage 23 von 50

1

A leak limiting device on a regulator:

Wähle eine der folgenden:

  • 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.

Erklärung

Frage 24 von 50

1

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

Wähle eine der folgenden:

  • Float gauge,

  • Pressure gauge,

  • Fixed liquid level gauge,

  • Roto gauge or slip tube gauge.

Erklärung

Frage 25 von 50

1

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

Wähle eine der folgenden:

  • 42%

  • 60%

  • 80%

  • 90%

Erklärung

Frage 26 von 50

1

The closing force in a gas pressure regulator is the:

Wähle eine der folgenden:

  • Adjustable spring above the diaphragm,

  • Pressure downstream of the regulator,

  • Inlet pressure to the regulator,

  • Pressure drop across the regulator.

Erklärung

Frage 27 von 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?

Wähle eine der folgenden:

  • 275 sq in

  • 300 sq in

  • 1200 sq in

  • 240 sq in

Erklärung

Frage 28 von 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?

Wähle eine der folgenden:

  • 164MBH

  • 41MBH

  • 75MBH

  • 82MBH

Erklärung

Frage 29 von 50

1

The closing force in a gas pressure regulator is the:

Wähle eine der folgenden:

  • Adjustable spring above the diaphragm.

  • Pressure downstream of the regulator.

  • Inlet pressure to the regulator.

  • Pressure drop across the regulator.

Erklärung

Frage 30 von 50

1

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

Wähle eine der folgenden:

  • 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.

Erklärung

Frage 31 von 50

1

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

Wähle eine der folgenden:

  • generator, evaporator, radiator, absorber

  • generator, evaporator, capacitor, absorber

  • generator, evaporator, compressor absorber

  • generator, evaporator, absorber, condenser

Erklärung

Frage 32 von 50

1

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

Wähle eine der folgenden:

  • 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

Erklärung

Frage 33 von 50

1

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

Wähle eine der folgenden:

  • a) Ammonia and helium

  • Ammonia and hydrogen

  • Ammonia and propane

  • Ammonia and butane.

Erklärung

Frage 34 von 50

1

What materials are approved for joining single wall vent connectors?

Wähle eine der folgenden:

  • Duct tape.

  • Pop rivets.

  • Sheet metal screws.

  • Silicone or adhesive.

Erklärung

Frage 35 von 50

1

Net stack temperature is the flue gas temperature:

Wähle eine der folgenden:

  • Downstream of the draft hood.

  • Upstream of the draft hood.

  • Plus the ambient temperature.

  • Minus the ambient temperature.

Erklärung

Frage 36 von 50

1

Two undesirable products of incomplete combustion are:

Wähle eine der folgenden:

  • Carbon monoxide and aldehydes

  • Carbon monoxide and nitrogen.

  • Carbon dioxide and aldehydes.

  • Carbon dioxide and heat.

Erklärung

Frage 37 von 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?

Wähle eine der folgenden:

  • 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.

Erklärung

Frage 38 von 50

1

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

Wähle eine der folgenden:

  • 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.

Erklärung

Frage 39 von 50

1

What type of burner is used in conversion burners?

Wähle eine der folgenden:

  • Ribbon burner

  • Flash burner

  • Purge burner

  • Inshot burner

Erklärung

Frage 40 von 50

1

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

Wähle eine der folgenden:

  • Pulsation will occur.

  • There will be poor efficiency.

  • The limit control will be ineffective.

  • The high limit switch will open.

Erklärung

Frage 41 von 50

1

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

Wähle eine der folgenden:

  • 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.

Erklärung

Frage 42 von 50

1

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

Wähle eine der folgenden:

  • 1”

  • 3”

  • 6”

  • 12”

Erklärung

Frage 43 von 50

1

Gross stack temperature is the flue gas temperature:

Wähle eine der folgenden:

  • Downstream of the draft hood.

  • Upstream of the draft hood.

  • Plus the ambient temperature.

  • Minus the ambient temperature.

Erklärung

Frage 44 von 50

1

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

Wähle eine der folgenden:

  • 18”

  • 24”

  • 36”

  • 48”

Erklärung

Frage 45 von 50

1

Gross stack temperature is the flue gas temperature:

Wähle eine der folgenden:

  • Downstream of the draft hood.

  • Upstream of the draft hood.

  • Plus the ambient temperature.

  • Minus the ambient temperature.

Erklärung

Frage 46 von 50

1

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

Wähle eine der folgenden:

  • 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.

Erklärung

Frage 47 von 50

1

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

Wähle eine der folgenden:

  • 3”

  • 6”

  • 12”

  • 18”

Erklärung

Frage 48 von 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?

Wähle eine der folgenden:

  • 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.

Erklärung

Frage 49 von 50

1

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

Wähle eine der folgenden:

  • Low gas pressure.

  • Overfiring.

  • Too low a water temperature, erratic temperature control.

  • A situation where deliming is required.

Erklärung

Frage 50 von 50

1

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

Wähle eine der folgenden:

  • 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.

Erklärung

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