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G2 Practice Exam - Part 2

G2 Practice Exam - Part 2

Questão 1 de 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.

Selecione uma das opções:

  • VERDADEIRO
  • FALSO

Explicação

Questão 2 de 50

1

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

Selecione uma das seguintes:

  • Relative humidity increases,

  • Carbon monoxide level increases,

  • Relative humidity decreases,

  • Carbon monoxide level decreases.

Explicação

Questão 3 de 50

1

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

Selecione uma das seguintes:

  • Filter the air in the house,

  • Ventilate the house,

  • Install mechanical attic ventilation,

  • Humidify the air in the house.

Explicação

Questão 4 de 50

1

The main purpose of the building skin is to:

Selecione uma das seguintes:

  • Protect the underlying materials,

  • Reduce heat gain,

  • Improve resistance to vapour flow,

  • Maintain the depressurization limit

Explicação

Questão 5 de 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?

Selecione uma das seguintes:

  • 0 square inches

  • 9 square inches

  • 18 square inches

  • 125 square inches

Explicação

Questão 6 de 50

1

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

Selecione uma das seguintes:

  • Carbon dioxide,

  • Air,

  • Nitrogen,

  • Water vapour.

Explicação

Questão 7 de 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?

Selecione uma das seguintes:

  • 0%

  • 1%

  • 3%

  • 5%

Explicação

Questão 8 de 50

1

Vapour barriers should be installed on:

Selecione uma das seguintes:

  • The inside of the insulation,

  • The outside of the insulation,

  • The cold side of the insulation,

  • The warm side of the insulation.

Explicação

Questão 9 de 50

1

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

Selecione uma das seguintes:

  • Motor sensor switch,

  • Motor safety switch,

  • High limit switch,

  • Centrifugal switch.

Explicação

Questão 10 de 50

1

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

Selecione uma das seguintes:

  • The burner will burn out prematurely,

  • The food will cook faster,

  • The food will cook slower,

  • Delayed ignition will occur.

Explicação

Questão 11 de 50

1

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

Selecione uma das seguintes:

  • 1 inch,

  • 3 inches,

  • 6 inches,

  • 9 inches.

Explicação

Questão 12 de 50

1

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

Selecione uma das seguintes:

  • 2 feet,

  • 6 feet,

  • 8 feet,

  • No maximum.

Explicação

Questão 13 de 50

1

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

Selecione uma das seguintes:

  • Spark sensor,

  • Ignition sensor,

  • Limit switch,

  • Main burner switch.

Explicação

Questão 14 de 50

1

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

Selecione uma das seguintes:

  • 14 inches W.C.,

  • 2 psig,

  • 5 psig,

  • 20 psig.

Explicação

Questão 15 de 50

1

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

Selecione uma das seguintes:

  • Pounds to 7 inches W.C.,

  • Ounces to 7 inches W.C.,

  • Pounds to 11 inches W.C.,

  • Ounces to 11 inches W.C.

Explicação

Questão 16 de 50

1

The gas meter test dial can be used for:

Selecione uma das seguintes:

  • Final billing purposes,

  • Checking system pressures,

  • Checking the input of an appliance,

  • Adjusting the relief setting.

Explicação

Questão 17 de 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?

Selecione uma das seguintes:

  • 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.

Explicação

Questão 18 de 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?

Selecione uma das seguintes:

  • 11,000 Btuh,

  • 41,000 Btuh,

  • 60,000 Btuh,

  • 82,000 Btuh.

Explicação

Questão 19 de 50

1

A pressure regulator is a device that:

Selecione uma das seguintes:

  • Measures gas flow,

  • Reduces gas pressure from inlet to outlet,

  • Increases gas pressure from inlet to outlet,

  • Maintains a minimum outlet pressure.

Explicação

Questão 20 de 50

1

Gas meters must be maintained in the upright position …

Selecione uma das seguintes:

  • 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.

Explicação

Questão 21 de 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?

Selecione uma das seguintes:

  • 2

  • 3

  • 5

  • 7

Explicação

Questão 22 de 50

1

When should a relief valve on a regulator operate?

Selecione uma das seguintes:

  • 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.

Explicação

Questão 23 de 50

1

A leak limiting device on a regulator:

Selecione uma das seguintes:

  • 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.

Explicação

Questão 24 de 50

1

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

Selecione uma das seguintes:

  • Float gauge,

  • Pressure gauge,

  • Fixed liquid level gauge,

  • Roto gauge or slip tube gauge.

Explicação

Questão 25 de 50

1

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

Selecione uma das seguintes:

  • 42%

  • 60%

  • 80%

  • 90%

Explicação

Questão 26 de 50

1

The closing force in a gas pressure regulator is the:

Selecione uma das seguintes:

  • Adjustable spring above the diaphragm,

  • Pressure downstream of the regulator,

  • Inlet pressure to the regulator,

  • Pressure drop across the regulator.

Explicação

Questão 27 de 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?

Selecione uma das seguintes:

  • 275 sq in

  • 300 sq in

  • 1200 sq in

  • 240 sq in

Explicação

Questão 28 de 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?

Selecione uma das seguintes:

  • 164MBH

  • 41MBH

  • 75MBH

  • 82MBH

Explicação

Questão 29 de 50

1

The closing force in a gas pressure regulator is the:

Selecione uma das seguintes:

  • Adjustable spring above the diaphragm.

  • Pressure downstream of the regulator.

  • Inlet pressure to the regulator.

  • Pressure drop across the regulator.

Explicação

Questão 30 de 50

1

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

Selecione uma das seguintes:

  • 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.

Explicação

Questão 31 de 50

1

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

Selecione uma das seguintes:

  • generator, evaporator, radiator, absorber

  • generator, evaporator, capacitor, absorber

  • generator, evaporator, compressor absorber

  • generator, evaporator, absorber, condenser

Explicação

Questão 32 de 50

1

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

Selecione uma das seguintes:

  • 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

Explicação

Questão 33 de 50

1

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

Selecione uma das seguintes:

  • a) Ammonia and helium

  • Ammonia and hydrogen

  • Ammonia and propane

  • Ammonia and butane.

Explicação

Questão 34 de 50

1

What materials are approved for joining single wall vent connectors?

Selecione uma das seguintes:

  • Duct tape.

  • Pop rivets.

  • Sheet metal screws.

  • Silicone or adhesive.

Explicação

Questão 35 de 50

1

Net stack temperature is the flue gas temperature:

Selecione uma das seguintes:

  • Downstream of the draft hood.

  • Upstream of the draft hood.

  • Plus the ambient temperature.

  • Minus the ambient temperature.

Explicação

Questão 36 de 50

1

Two undesirable products of incomplete combustion are:

Selecione uma das seguintes:

  • Carbon monoxide and aldehydes

  • Carbon monoxide and nitrogen.

  • Carbon dioxide and aldehydes.

  • Carbon dioxide and heat.

Explicação

Questão 37 de 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?

Selecione uma das seguintes:

  • 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.

Explicação

Questão 38 de 50

1

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

Selecione uma das seguintes:

  • 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.

Explicação

Questão 39 de 50

1

What type of burner is used in conversion burners?

Selecione uma das seguintes:

  • Ribbon burner

  • Flash burner

  • Purge burner

  • Inshot burner

Explicação

Questão 40 de 50

1

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

Selecione uma das seguintes:

  • Pulsation will occur.

  • There will be poor efficiency.

  • The limit control will be ineffective.

  • The high limit switch will open.

Explicação

Questão 41 de 50

1

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

Selecione uma das seguintes:

  • 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.

Explicação

Questão 42 de 50

1

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

Selecione uma das seguintes:

  • 1”

  • 3”

  • 6”

  • 12”

Explicação

Questão 43 de 50

1

Gross stack temperature is the flue gas temperature:

Selecione uma das seguintes:

  • Downstream of the draft hood.

  • Upstream of the draft hood.

  • Plus the ambient temperature.

  • Minus the ambient temperature.

Explicação

Questão 44 de 50

1

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

Selecione uma das seguintes:

  • 18”

  • 24”

  • 36”

  • 48”

Explicação

Questão 45 de 50

1

Gross stack temperature is the flue gas temperature:

Selecione uma das seguintes:

  • Downstream of the draft hood.

  • Upstream of the draft hood.

  • Plus the ambient temperature.

  • Minus the ambient temperature.

Explicação

Questão 46 de 50

1

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

Selecione uma das seguintes:

  • 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.

Explicação

Questão 47 de 50

1

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

Selecione uma das seguintes:

  • 3”

  • 6”

  • 12”

  • 18”

Explicação

Questão 48 de 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?

Selecione uma das seguintes:

  • 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.

Explicação

Questão 49 de 50

1

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

Selecione uma das seguintes:

  • Low gas pressure.

  • Overfiring.

  • Too low a water temperature, erratic temperature control.

  • A situation where deliming is required.

Explicação

Questão 50 de 50

1

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

Selecione uma das seguintes:

  • 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.

Explicação

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