g2 practice test

Underground piping or tubing shall be tested in accordance with the:

A) Appliance manufacturers installation instructions

B) Requirements established by the Ministry or Labour

C) Requirements of the B149. 1 Code

D) Bulletins issues by the local gas distributor

D) Bulletins issues by the local gas distributor

What is the allowable maximum distance piping supports should be spaced on a 4 inch horizontal gas line?

A) 15 feet

B) 20 feet

C) 25 feet

D) 30 feet

A) 15 feet

Table 6.2

What is the required minimum distance a purge line may terminate from either a building or air intake when purging a piping tubing system to outdoors?

A) 5 feet

B) 10 feet

C) 15 feet

D) 20 feet

B) 10 feet

6.23.7(a)

Schedule 80 piping is required in a propane system:

A) For propane vapour under 125 pisg working pressure

B) When steel piping is to be connected to plastic piping

C) For propane vapour over 125 pisg working pressure

D) When copper piping is to be connected to plastic piping

6.2.3

C) For propane vapour over 125 pisg working pressure

What is the minimum time and pressure required to test a new welded 3 inch NPS piping system that is 220 feet long with a supply pressure of 40 psig?

A) 60 minutes at 50 pisg

B) 180 minutes at 60 pisg

C) 60 minutes at 55 pisg

D) 180 minutes at 50 psig

B) 180 minutes at 60 pisg

Above ground piping of which size and larger must be welded, unless the authority having jurisdiction allows threaten joints?

A) Land 1/4”

B) 1 and 1/2”

C) 2"

D) 2 and 1/2”

D) 2 and 1/2”

What size tubing is required to supply propane to a 225,000 Btuh input appliance when installing 95 feet of copper tubing which will operate at 2 psig with a pressure drop of 1.0 psig?

A) 0.375” (3/8”)

B) 0.500” (1/2*)

C) 0.625” (5/8”)

D) 0.750” (3/4*)

C) 0.625” (5/8”)

When is it necessary to purge every branch supply line in a piping system?

A) Never

B) Always

C) Only when the branch supply line size is larger than 1" NPS

D) Only when the branch supply line will be operating at a pressure in excess of 0.5 pisg

B) Always

When sizing a branch line, what is the minimum size of job fabricated welded fitting that can be used on NPS 6” gas supply header?

A) 1/2” NPS

B) 3/4” NPS

C) 2” NPS

D) 3” NPS

B) 3/4” NPS

Natural gas piping in industrial building shall be identified:

A) With yellow paint or yellow bands

B) With red paint or red bands

C) With paint in a contrasting colour to other piping

D) With green paint or yellow bands

A) With yellow paint or yellow bands

When sizing a brand line, what is the maximum size of job fabricated welded fitting that can be used in a 4” NPS gas supply header?

A) 6” NPS

B) 2” NPS

C) 4” NPS

D) 3” NPS

B) 2” NPS

Armoured cable is called"

A) NMW

B) NMD

C) BX

D) LVT

C) BX

This symbol is a:

A) Normally closed float switch that opens on rise

B) Normally open temperature switch that close on fall

C) Normally open flow switch the closes on flow

D) Normally closed pressure switch that opens on fall

B) Normally open temperature switch that close on fall

This symbol is a:

A) Normally open pressure switch that closes on rise

B) Normally closed temperature switch that opens on fall

C) Normally open flow switch that closes on flow

D) Normally closed humidity switch that opens on fall

C) Normally open flow switch that closes on flow

This symbol is a;

A) Normally closed float switch that opens on rise

B) Normally open temperature switch that closes on fall

C) Normally open flow switch that closes on flow

D) Normally closed pressure switch that opens on fall

D) Normally closed pressure switch that opens on fall

On an electrical schematic diagram, the safety controls are typically drawn:

A) To the right of the loads

B) Above the loads

C) Below the loads

D) To the left of the loads

D) To the left of the loads

When a new appliance is to be installed in a building using steel framing and steel studs and the supply wiring to it will be in contact with the studding. Which of the follow types or wire is acceptable, and the most cost effective?

A) NMW

B) NMD

C) BX

D) LVT

C) BX

Voltmeters are connected:

A) In series with the device being checked

B) In parallel with the device being checked

C) With the system power off

D) In series with the loads only

B) In parallel with the device being checked

A panel mounted ground fault circuit interrupting breaker protects all:

A) Electrical loads in the circuits from the panel

B) Loads in the circuit served by that breaker

C) 240 volt circuits served by that breaker panel

D) 120 volt circuits served by that breaker

B) Loads in the circuit served by that breaker

A hard, sharp pilot flame indicates:

A) The orifice is too small

B) There is a lack of air

C There is excessive draft at the pilot location

D) High gas pressure

A) The orifice is too small

A good pilot generator should produce what voltage?

A) 750 mV

B) 110 volts

C) 25 ma

D) 150 mV

A) 750 mV

Which of the following statement is correct?

A) Conductors must extend no more than 10 cm (4) into an electrical box

B) A ground wire shall not be used as a neutral wire

C) No more than 3 conductors may be installed under a terminal screw unless connectors are used

D) Aluminum and copper conductors of the same gauge are rated to carry the same current

B) A ground wire shall not be used as a neutral wire

Which statement is correct?

A) The series-parallel circuit is the most common type of circuit used to gas appliances

B) A corroded switch may cause a parallel circuit to act like a series-parallel circuit

C) The series circuit is the only type of circuit used in heating appliances

D) The parallel circuit is never used in heading appliances

A) The series-parallel circuit is the most common type of circuit used to gas appliances

A zero ohmmeter reading tank between the casing of a solenoid and disconnected wire to the solenoid indicates that:

A) The coil is good

B) The coil is shorted to the casing of the device

C) The coil wire is broken

D) All of the above

B) The coil is shorted to the casing of the device

The instrument used to determine potential difference in an electrical circuit is the:

A) Voltmeter

B) Ohmmeter

C) Ammeter

D) Potentiometer

A) Voltmeter

As the diameter of a wire increases the resistance:

A) Increases

B) Decreases

C) Remains the same

D) Fluctuates

B) Decreases

 In a normal thermocouple application, the expected drop out reading is from:

A) 2-4 millivolts

B) 2-4 microamps

C) 6-10 millivolts

D) 6-10 microamps

A) 2-4 millivolts

The resistance of a wire    as its temperature rises.

A) Increases

B) Decreases

C) Remains the same

D) Fluctuates

A) Increases

What is the percentage of the appliance-rated gas is applied to a burner using a two stage gas valve when the thermostat calls for the second stage of heat?

A) 100%

B) 120%

C) 175%

D) 200%

A) 100%

An intermittent pilot is present:

A) Only at the instant of the initial call for heat

B) Only until the main burner is lit

C) Only while the main burner is operating

D) From the time there is a call for heat until the call has ended

B) Only until the main burner is lit

Thermostats are selected and rated to switch:

A) Line voltage loads

B) Low voltage loads

C) Millivolts loads

D) All of the above

D) All of the above

Burner interlocking flow switched are generally used on boilers which have      water capacities.

A) Small

B) Large

C) Fluctuating

D) Variable

A) Small

A combustion gas valve contains:

A) An appliance regulator, an automatic gas safety shut off valve, a pilot turndown valve

B) A manual shut off valve an automatic gas valve, a pressure regulator

C) A test firing valve, an automatic gas valve, an ignition control valve

D) A minimum gas pressure safety switch, an automatic gas valve, a pressure regulator

B) A manual shut off valve an automatic gas valve, a pressure regulator

A hot surface ignitor require    volts to operate properly.

A) 24 to 30 mV

B) 24 to 30 VAC

C) 115 - 125 VAC

D) 190-240 VAC

C) 115 - 125 VAC

Trial for ignition is the time allowed to:

A) Shut the valve down in the event of the flame outage

B) Establish ignition

C) Relight a flame

D) Reset an ignition control

B) Establish ignition

What happens to the current flow through an infrared scanner when the scanner is exposed to infrared radiation?

A) Current increases

B) Current decreases

C) Current remains the same

D) Current fluctuates

A) Current increases

Which of the following heating systems would be expected to cause problems due to this "distribution effect"?

A) A direct vent furnace

B) A conventional vent type boiler

C) A forced air furnace with no return openings in the furnace room

D) A forced air furnace with a return air opening in the furnace room

D) A forced air furnace with a return air opening in the furnace room

The key components of a building as a system are:

A) The building envelope and occupants

B) The building envelope, mechanical systems, occupants, and internal environment

C) The building envelope, external environment, mechanical systems, and the occupants

D) The building envelope, mechanical systems, external environment, and the building structure

C) The building envelope, external environment, mechanical systems, and the occupants

Conduction is:

A) A wave form of heat transfer

B) The transfer of heat particle to particle

C) The transfer of heat through a fluid

D) The transfer of heat through a vacuum

B) The transfer of heat particle to particle

Currently, the most common type of building construction is:

A) Balloon

B) Platform

C) Double brick

D) Solid brick

B) Platform

To ensure the main burner cannot operate unless the dampers are in the fully open position, electrically operated automatic combustion air dampers shall be:

A) Locked in the open position

B) Locked in the closed position

C) Interlocked with the burner control system

D) Installed with a fixed opening 20%

C) Interlocked with the burner control system

A depressurization test conducted on a house will help determine the:

A) Heat loss of the house

B) Potential for pressure-induced back drafting in the house

C Relative humidity in the house

D) Number of air change per hour in the house

B) Potential for pressure-induced back drafting in the house

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

A) True

B) False

B) False

A proper heat loss calculation has been performed for a house which requires a furnace replacement. The numbers indicate the heat loss is 100,000 Btu/h. Which of following furnace should be selected for the installation?

A) A 100,000 Btu/h input furnace with an AFUE rating of 85%

B) A 120.000 Btu/h input furnace with an AFUE rating of 85%

C) A furnace with the same input as one the one being replaced

D) A furnace with 1.5 times the input as the one being replaced

B) A 120.000 Btu/h input furnace with an AFUE rating of 85%

To ensure that negative building pressure never causes pressure-induced backdrafting:

A) Never operate the exhaust fans when the appliance are operating

B) Open a window when the appliances are operating

C) Use sealed combustion, direct vent appliances

D) Use draft inducer on all wood fireplaces

C) Use sealed combustion, direct vent appliances

Air enters the house through a process called

A) Infiltration

B) Exfiltration

C) Aspiration

D) Expiration

A) Infiltration

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

A) The burner will burn out prematurely

B) The food will cook faster

C) The food will cook slower

D) Delayed ignition will occur

A) The burner will burn out prematurely

The required clearance to combustible materials above a pendant gas lamp is:

A) 5 inches

B) 12 inches

C) 15 inches

D) 18 inches

D) 18 inches

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

A) Motor safety switch

B) Motor sensor switch

C) High limit switch

D) Centrifugal switch

D) Centrifugal switch

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

A) 1 inch

B) 3 inches

C) 6 inches

D) 9 inches

C) 6 inches

 Which symbol represents a gas solenoid?

A) 4

B) 5

C) 6

D) 7

C) 6

Which symbol represents the dryer heat thermostat?

A) 1

B) 2

C) 3

D) 4

A) 1

Which symbol represents a dryer high limit switch?

A) 1

B) 2

C) 3

D) 7

C) 3

 Which symbol represents a dryer centrifugal switch?

A) 1

B) 3

C) 6

D) 7

D) 7

Which symbol represents a dryer pilot switch?

A) 1

B) 2

C) 3

D) 7

B) 2

Which symbol represents a timer motor?

A) 4

B) 5

C) 6

D) 7

B) 5

The pressure relief valve on a propane tank is set at:

A) 225 pisg

B) 250 psig

C) 325 psig

D) 375 psig

B) 250 psig

The closing force in a gas pressure regulator is the:

A) Adjustable spring above the diaphragm

B) Pressure downstream of the regulator

C) Inlet pressure to the regulator

D) Pressure drop across the regulator

B) Pressure downstream of the regulator

A pressure regulator:

A) Measures gas flow

B) Controls outlet pressure

C) Controls inlet pressure

D) Boosts outlet pressure

B) Controls outlet pressure

To what specifications are propane cylinders, manufactured in Canada after January Ist 1993, built and marked?

A) Boiler and Pressure vessels Regulation

B) Canadian Standards Association

C) Transport Canada

D) Ministry of Consumer and Business Service

C) Transport Canada

A worn or dirty seal on a regulator assembly may produce:

A) Low pressure upstream

B) High pressure upstream

C) Low pressure downstream

D) High pressure downstream

D) High pressure downstream

A pressure regulator is a device that:

A) Measures gas flow

B) Reduces gas pressure from inlet to outlet

C) Increases gas pressure from inlet to outlet

D) Maintains a minimum outlet pressure

D) Maintains a minimum outlet pressure

Propane containers located on the outside of a recreational vehicle shall be:

A) Mounted securely to the roof of the vehicle

B) Mounted on the "A" frame as close to the front of the vehicle as practicable

C) Secured ahead of the front of the bumper

D) Secured to the rear of the vehicle

B) Mounted on the "A" frame as close to the front of the vehicle as practicable

What is purpose of purging new or reconditioned cylinders?

A) To remove carbon monoxide and nitrogen

B) To remove water and oxygen

C) To remove oxygen and carbon monoxide

D) To remove carbon dioxide and nitrogen

B) To remove water and oxygen

If a second stage regulator is adjusted to compensate to undersized piping, one of the results will be:

A) High lock up pressures

B) A low inlet regulator pressure

C) High stack temperature

D) Low stack temperature

A) High lock up pressures

The maximum gas pressure allowed in a recreational vehicle or mobile home is:

A) 11" W.C

B) 13" W.C

C) 1 pisg

D) 20 psig

B) 13" W.C

A first stage regulator installed indoors in a domestic application:

A) Will eliminate fluctuating gas pressure

B) Does not have to be protected

C) Must be protected within a cage

D) Is not permitted

D) Is not permitted

What should be done if it is noticed that a regulator set in a loading dock area is not protected against physical damage?

A) Advise the customer to provide protection as soon as possible

B) Notify the local gas utility that protection is required

C) Advise the customer to contact the local gas utility

D) Report the situation to TSSA immediately

B) Notify the local gas utility that protection is required

A two stage regulation system on propane will:

A) Increase the likelihood of freeze-ups

B) Reduce fluctuating delivery pressures

C) Decrease propane consumption

D) Increase delivery in cold weather

B) Reduce fluctuating delivery pressures

Which regulator component is used as a measuring element?

A) The spring

B) The valve

C) The diaphragm

D) The body

C) The diaphragm

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 the tank?

A) No

B) No, unless the tank is less than 1000 USWG

C) Only if it is installed by a certified propane technician

D) Only with the permission of the propane company

A) No

 What will happen if the adjusting screw of a regulator is turned counter-clockwise, decreasing the spring tension?

A) The downstream pressure will remain the same

B) The downstream pressure will decrease

C) The upstream pressure will increase

D) The upstream pressure will decrease

B) The downstream pressure will decrease

Which of the follow best describes a bellows type meter?

A) One which uses a spinning turbine to drive the index needle

B) One which uses pressure differential across an opening to indicate flow rate

C) One which uses the volume displaced through chambers divided by a flexible material to drive dials

D) One which is normally installed on loads over 2 million cfh

C) One which uses the volume displaced through chambers divided by a flexible material to drive dials

The primary function of a surge arrestor in the top of a regulator is to:

A) Allow the regulator to breathe

B) Reduce the opening speed of the regulator

C) Limit the escape of the gas to 1 cu.ft/hour

D) Stop the regulator from operating if it is over pressurized

C) Limit the escape of the gas to 1 cu.ft/hour

What is the largest pronto cylinder manufactured?

A) 240 pounds WC

B) 300 pounds WC

C) 420 pounds WC

D) 1000 pounds WC

C) 420 pounds WC

Which of the following are used in an absorption refrigeration cycle

A) Ammonia and helium

B) Ammonia and hydrogen

C) Ammonia and propane

D) Ammonia and butane

B) Ammonia and hydrogen

What kind of propane refrigerator can be installed in a recreational vehicle?

A) Unvented

B) An approved direct vent type or equivalent

C) An approved refrigerator connected with B vent

D) A new appliance only

B) An approved direct vent type or equivalent

When a refrigerator develops excessive frost on the evaporator

A) It becomes less efficient

B) It becomes more efficient

C) A safety valve shuts it off

D) The high limit shuts if off

A) It becomes less efficient

A propane refrigerator runs on:

A) Propane, natural gas, and 12 volts D.C

B) Propane, 120 volts A.C and 24 volts D.C

C) Propane; 12 volts- D.€ and 24 volts D.C

D) Propane, 12 volts D.C and 120 volts A.C

D) Propane, 12 volts D.C and 120 volts A.C

How often should a refrigerator be serviced and cleaned?

A) Once every three years

B) Once every 5 years

C) At least once a year or as recommended by the manufacturer

D) At least three times a year or as recommended by the manufacturer

C) At least once a year or as recommended by the manufacturer

Why does the recommended range of CO2 in a converted furnace differ from the ultimate amount of CO2 of 11.9%?

A) To provide a safety margin

B) To provide a higher efficiency

C) To maintain a neutral pressure point a the door catch

D) To maintain a low stock temperature

A) To provide a safety margin

When the required minimum clearance for a vent connector is 9" to combustible material with no protection, what is the acceptable method to reduce the clearance by 3"?

A) Use 0,50* insulating mill board speed out 0.5" with a non-combustible spacer

B) Use 0.25" insulating millboard speed out 1" with a non-combustible spacer

C) Use 22 gauge sheet metal attached to the hot side of the combustible material

D) Use 28 gauge sheet metal spaced out 1" from the combustible material

B) Use 0.25" insulating millboard speed out 1" with a non-combustible spacer

Table 8.7

How can the location of a leak in heat exchanger to be determined?

A) By using a flue gas analyzer an visual examination

B) By using a carbon monoxide detector and visual examination

C) By using a smoker generator and visual examination

D) All of the above

D) All of the above

How far above the burner port does the centre line of the flue outlet have to be to convert a revertible flue furnace with a natural draft burner?

A) At least 6"

B) Less than 12"

C) At least 12"

D) At least 24"

B) Less than 12"

What materials are approved for joining single wall vent connectors?

A) Duct tape

B) Pop rivets

C) Sheet metal screw

D) Silicone or adhesive

C) Sheet metal screw

 A found draft burner has a blower that produces sufficient pressure to overcome the resistance of the:

A) Burner

B) Burner and the appliance

C) Burner and the appliance downdraft

D) Venting system

B) Burner and the appliance

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

A) 1

B) 3"

C) 6"

D) 12"

A) 1”

Two undesirable products of incomplete combustion are:

A) Carbon monoxide and aldehydes

B) Carbon monoxide and nitrogen

C) Carbon dioxide and aldehydes

D) Carbon dioxide and heat

A) Carbon monoxide and aldehydes

When it is necessary, where should a vent connector be reduced?

A) At the breeching of the appliance

B) At the chimney

C) Downstream of the draft regulator

D) At the draft regulator

A) At the breeching of the appliance

The most likely cause of a puddle of water at the side of a water heater where the drain cock and relief valve are located is that:

A) A drain cock is opening intermittently

B) The relief valve is opening periodically

C) It is caused by condensation created when cold water enters the tank

D) The unitrol fitting is leaking and re-sealing itself

B) The relief valve is opening periodically

Is it permitted to use water heaters for space heating only?

A) Yes

B) No

B) No

In combustion heating systems employing a water heater and an air handler, the burner is activated by the temperature sensor in the:

A) Room thermostat

B) Air handler

C) Water heater aquastat

D) Heat secondary exchanger

A) Room thermostat

"Temperature Rise", when applied to a hot water heater is the:

A) Difference between outdoor temperature and the flue gas temperature

B) Water temperature difference across the heater

C) Temperature difference between the bottom and top of the heater

D) Height of the hot water piping system

B) Water temperature difference across the heater

Which of the controls listed below controls the gas pressure to the main burner, the temperature of water, and turns off the gas when the pilot goes out?

A) E.C.O

B) Temperature and pressure relief valves

C) Aquastat

D) Unitrol

D) Unitrol

The minimum allowable distance to be maintained from a 50,000 BTUH water heater flue outlet directly above a gas utility service regulator is:

A) 1°

B) 3°

C) 10°

D) 15°

8.14.8(d)

D) 15°

The minimum allowable distance to distance to be maintained from a 50,000 Btuh water heater flue outlet to a building opening is:

A) 6"

B) 12

C) 2"

D) 3"

8.14.8(g)ji

B) 12”

The "stacking effect" in a water heater is usually caused by;

A) An overfired burner

B) A broken dip tube

C) Short draws of water from the heater

D) The chimney velocity being too high

C) Short draws of water from the heater

The minimum allowable distance to be maintained from a 50,000 Btuh water heater flue outlet to a gas utility service regulator vent opening is:

A) 1°

B) 2'

C) 3°

D) 6'

8.14.8(d)

C) 3°

Combination systems are sized to deliver …   of the calculated heat loss of the building.

A) 90%

B) 95% to 105%

C) 120%

D) 200%

C) 120%

When determining the position of an air handler and a water heater to be connected for combination heating use, the most important factor to consider from the following is:

A) Venting of the water heater

B) Water piping the water heater

C) Duct design for the air handler

D) Water piping to the air handler

A) Venting of the water heater