TSSA GAS 2 practice test

As the length of an electrical run increases, it may be necessary to

Increase the wire size

Fuses serving motor circuits should be

Time delay type

Millivolt wiring should be isolated from Line Voltage Wiring because

The line voltage will induce a voltage into the millivolt wiring.

Which tool is used to determine if the windings on an electric motor have shorted

ohmmeter

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

To the left of the loads

Which of the following types of wire must be used in damp locations?

NMW

On an electrical schematic, all operating controls are drawn

Normally open

An inline ammeter is connected

In series with the device being checked

As the length of a conductor increases, the voltage drop along the conductor

increases

When a new appliance is to be installed in a typical residential basement and the supply wiring to it is to be concealed, which of the following types of wire is acceptable, and most cost effective

NMD

When checking a circuit of unknown voltage using an analog meter with 0-30V, 0-125V, 0-250V, and 0-600V, which scale should be selected

0-600V

120 volt power supply for a residential electrical circuit is taken form the

Load side of one branch circuit breaker and a neutral lug

receptacle mounted ground fault circuit interrupter protects against

Current flow to ground

An electrical pictorial diagram is used to

Show component location

When using an ohmmeter, the most important thing to remember is to

De-energize the circuit

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

The coil is shorted to the casing of the development

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

Voltmeter

When the voltage has been determine to be approximately 120 volts, which scale on an analog meter should be selected for most accuracy?

0-250 Volts

The resistance of a thermistor ... as its temperature rises

decreases

A hot surface igniter requires how many volts to operate properly

115 to 125 VAC

is permissible to use gas piping as an electrical ground if

It is used in the flame safeguard circuit

A thermopile or powerpile generates:

Hundreds of Millivolts

How is the heat anticipator setting determined for a thermostat with an adjustable anticipator?

By measuring the current drawn by the components in the circuit being feed directly by the thermostat

A fan control is a

Normally open temperature control that closes on temperature rise,

As the temperature of a thermistor increases, the current flow through it.

increases

A thermostat with a single mercury bulb which controls a single stage heat, single stage cool unit is a ... control

SPDT (Single Pole Double Throw)

thermostat serving a unit which has separate heating and cooling control transformers and has one stage of heating and one stage of cooling is a ... control.

DPDT (Double Pole Double Throw)

Separate heating and cooling, therefore double pole and double stage for heating and cooling therefore double throw. Which of the following heating systems would be expected to cause problems due to the "distribution effect"?

forced air furnace with a return air opening i n the furnace room.

The recommended range of relative humidity in a house to control indoor air contaminates, increase comfort, and maintain the structural integrity of the house is

30% to 50%

After a direct vent radiant heating system is installed in a new house, the customer complains that, "the walls and windows are wet." What is the most reasonable response?

Recommend the installation of a mechanical ventilation system.

Which is the most common cause of flue gas spillage from gas appliances?

Negative air pressure caused by mechanical systems,

Air enters a house through a process called?

infiltration

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

(TRUE OR FALSE)

FALSE

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

relative humidity increases

The best way to remove odours from a house is to

ventilate the house

The main purpose of the building skin is to

Protect the underlying materials,

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

Air

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?

0%

Vapour barriers should be installed on what side?

The warm side of the insulation

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

centrifugal switch

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

The burner will burn out prematurely

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

6 inches

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

6 inches

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

Ignition Sensor

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

2 psig (14 kPa)

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

Pounds to 7 Inches W.C.

The gas meter test dial can be used for

Checking the Input of an Appliance

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?

No

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

82,000 BTU

A Pressure Regulator is a device that:

Reduces gas pressure from inlet to outlet

Gas meters must be maintained in the upright position.

At all times, including when connected for service

When propane is to be used in the construction repair or improvement 100lb cylinders may be manifolded together and used indoors? of a building, how many

3,

When should a Relief Valve on a Regulator operate?

When there is excessive pressure in the supply piping,

A leak limiting device on a regulator

Allows a controlled, safe amount of leakage if the diaphragm ruptures,

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

Roto Guage or Slip Tube Guage

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

80%

The closing force in a gas pressure regulator is the

Pressure downstream of the regulator,

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

Adjusting the regulator set point using a manometer to the appliance rating.

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

Generator, Evaporator, Absorber, Condenser

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

No

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

Ammonia and hydrogen

What materials are approved for joining single wall vent connectors?

Sheet metal screws

Net stack temperature is the flue gas temperature:

Minus the Ambient Temperature

Two undesirable products of incomplete combustion are

Carbon monoxide and aldehydes

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?

By comparing it to a known sample

What type of Burner is used in Conversion Burners?

Inshot burner

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

There will be poor efficiency.

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

Advise the user in writing of the procedures to be followed to discontinue the supply of the

former form of energy.

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

1"

Gross stack temperature is the flue gas temperature

Upstream of the draft hood.

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

Heating Output from the Air Handler Decreases

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

12"

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

Isolation Valves should be installed in both the Supply and Return Line of the Heating Loop

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

A situation where deliming is required

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

Water Temperature difference across the Heater

The temperature of the water returning from the heating loop in a combination system employing a water heater for domestic hot water and space heating must be:

Lower than the minimum Temperature required to activate the Burner

The components of a copper fin tube, instantaneous water heater are a/an:

Pump, Pump Control, Flow Switch, Temperature and Pressure Relief Valve, and a Limit Control

Net stack temperature is the flue gas temperature

Minus the Ambient Temperature

Two undesirable products of incomplete combustion are:

Carbon monoxide and aldehydes

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

By comparing it to a known sample.

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

By disconnecting the air circulation blower

What type of burner is used in conversion burners?

Inshot burner

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

There will be poor efficiency

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

48 inches

Gross stack temperature is the flue gas temperature:

Upstream of the Draft Hood

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

Heating Output from the Air Handler Decreases

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

12"

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

Isolation valves should be installed in both the supply and return line of the heating loop.

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

A situation where Deliming is required

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

Water temperature difference across the heater

The temperature of the water returning from the heating loop in a combination system employing a water heater for domestic hot water and space heating must be

Lower than the minimum Temperature required to activate the Burner

The components for a copper fin tube, instantaneous water heater are a/an

Pump, Pump Control, Flow Switch, Temperature and Pressure Relief Valve, and a Limit Control

The most likely cause of an intermittent hissing sound "like water dripping on something hot" coming from a water heater is

Condensation in the flue passage caused by drawing water from the tank when the hot water has been depleted

Most thermostatically controlled domestic hot water heaters utilize

Rod and Tube sensing

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 list is:

Venting of the water heater

A customer complains that the pilot goes out every once in a while. This is the second service call for this problem this month. When the pilot is reestablished, the closed circuit millivolt test stays steady at 14mV, the magnet drops out at 4mV, what should be done next?

Check for another problem such as down draft or pilot position

Which of the following is required to determine the size of a circulator pump to be used on a combination heating system employing a water heater?

The required water flow rate and the head pressure in the complete heating loop

When diluting muriatic acid with water:

add acid to water

What should be done if a relief valve is leaking?

Replace the Relief Valve and check for the cause of the activation

The flow rate of the water passing through a heating coil of an air handler is controlled by the

Balancing Valve on the Heating Loop