Controls and Components

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Question 1

What is the purpose of a pilot?

A	It ignites the main burners
B	It proves the existence of a flame
C	It sends a signal to the gas valve
D	It opens a pilot valve

Question 2

What type of pilot sensor is used on a standing pilot furnace?

A	A mercury flame sensor
B	A flame rod
C	A hot surface igniter
D	A thermocouple

Question 3

What is the purpose of a thermocouple?

A	It energizes the system using 750 millivolts
B	It ignites the main burner
C	It proves the exists of a pilot flame
D	It ignites the pilot

Question 4

How far must the tip of a thermocouple be placed in the pilot flame?

A	1/8” to ¼”
B	3/8” to ½”
C	¾” to 1”
D	1 ½ “

Question 5

How many millivolts does a thermocouple produce?

A	750
B	550
C	30
D	15

Question 6

How many millivolts does a thermopile produce?

A	750
B	350
C	150
D	30

Question 7

What three components make up a spark ignition system?

A	A cable, and electrode, and a sensor
B	An ignition transformer, a cable, and an electrode
C	An electrode, and ignition transformer, and a sensor
D	A cable, a sensor, and an ignition transformer

Question 8

In a furnace that uses an intermittent pilot,

A	The pilot is continually lit
B	The pilot is lit with each cycle of the furnace
C	It is considered a standing pilot system
D	It often uses a thermocouple

Question 9

An intermittent pilot system uses

A	A spark igniter to light the pilot
B	A hot surface igniter to light the pilot
C	A match to light the pilot
D	A spark or hot surface igniter to light the pilot

Question 10

What is another name for a hot surface igniter?

A	A cadmium igniter
B	A silicon carbide igniter
C	A tungsten igniter
D	Both A and B

Question 11

Which of the following would be the quietest ignition system?

A	An indirect spark ignition
B	A direct spark ignition
C	A hot surface igniter
D	An intermittent spark igniter

Question 12

The voltage of a hot surface igniter can be

A	120v
B	50v
C	24v
D	Both A and C

Question 13

What type of pilot is commonly used on a direct ignition system?

A	A nonareated pilot only
B	An aerated pilot only
C	An aerated or nonaerated pilot
D	Pilots are not used on direct ignition systems

Question 14

What is the setting of the spark gap on a spark ignition system?

A	1/8”
B	¼”
C	3/8”
D	½”

Question 15

How far must the tip of a flame igniter/sensor be placed from the main burner or pilot flame?

A	1/8” to ¼”
B	3/8” to ½”
C	¾” to 1”
D	1 ½”

Question 16

The voltage created by an ignition control module is commonly in the range of

A	2,000 to 3,000 volts
B	7,000 to 15,000 volts
C	20,000 to 50,000 volts
D	None of the above

Question 17

What are four common furnace designs?

A	Downflow, lowboy, highboy, and multipositional
B	Upflow, lowboy, downflow, and multipositional
C	Horizontal, lowboy, highboy, and multipositional
D	Upflow, downflow, horizontal, and multipositional

Question 18

Which of the following are not located on a combination gas valve?

A	A pilot solenoid and a main valve solenoid
B	A pressure regulator and a pilot solenoid
C	A main shutoff and a pilot adjustment
D	A spark igniter and a sensor wire

Question 19

What is the purpose of the pressure regulator that is located on a combination gas valve?

A	It takes incoming gas pressure of 3.5” WC and increases it to 7”WC
B	It takes an incoming gas pressure of 7”WC and reduces it to 3.5”WC
C	It increases the pressure when the screw is turned clockwise
D	Both B and C

Question 20

What component is located in the gas manifold that is used to distribute gas to each chamber?

A	A distributor
B	An equalizer
C	An orifice
D	None of the above

Question 21

What is the purpose of primary air?

A	It is air needed for proper combustion. It mixes with the main burner fuel at the point of ignition
B	It is air needed for proper combustion. It mixes with the main burner fuel before the point of ignition
C	It is air needed for proper combustion. It mixes with the main burner fuel after the point of ignition
D	Both A and B

Question 22

What is secondary air?

A	It is air that mixes with the main burner fuel at the point of ignition. This ensures proper combustion
B	It is air that mixes with the main burner fuel before the point of ignition. This ensures proper combustion
C	It is air that mixes with the main burner fuel after the point of combustion. This ensures proper combustion
D	Both A and B

Question 23

In what part of the burner does air and fuel mix before combustion?

A	The crossover section
B	The venturi
C	The orifice
D	The outlet

Question 24

If gas burners are not installed properly, what problem could this cause?

A	Erratic limit cycles
B	Improper heat exchanger contraction
C	Delayed ignition
D	Decreased blower operation

Question 25

Which of the following is not considered a type of gas burner design?

A	Blast tube
B	Slotted
C	Ribbon
D	Inshot

Question 26

Which part of a gas furnace allows the air within the furnace location to blend with products of combustion?

A	The draft diverter
B	The vent connector
C	The barometric damper
D	The flue pipe

Question 27

The purpose of a fan control is to?

A	Start the blower
B	Stop the blower
C	Start and stop the blower
D	Start the inducer motor

Question 28

What type of fan control operates the blower by temperature only?

A	A bimetal fan control
B	A timed delay fan control
C	A solid state fan control
D	Both A and B

Question 29

What type of fan control uses an electric heater as a means of operating the blower motor?

A	A bimetal fan control
B	A timed delay fan control
C	A solid state fan control
D	Both A and B

Question 30

A pressure switch on a condensing furnace is used to?

A	Prove the operation of the indoor blower
B	Prove the operation of the induced draft blower
C	Sense the gas pressure to the gas valve
D	Sense the gas pressure in the pilot valve

Question 31

A limit control is designed to

A	Cycle the system on and off depending on space temperature
B	Operate the blower when the thermostat calls for heat
C	De energize the gas valve if the furnace overheats
D	Limit the operation of the induced draft motor

Question 32

Which control is commonly found on downflow and multipositional furnaces but is not normally used on upflow furnaces?

A	An air pressure control
B	A primary limit control
C	Pilot safety control
D	An auxiliary limit control

Question 33

What control is commonly used on high efficiency condensing furnaces to protect against high stack temperatures?

A	A limit control
B	A flame roll out control
C	A vent safety control
D	An auxiliary limit control

Question 34

What control is commonly used on high efficiency condensing furnace to protect against a plugged heat exchanger?

A	A limit control
B	A flame roll out control
C	A vent safety control
D	An auxiliary limit control

Question 35

The part of the system that contains the products of combustion primarily for a thermal transfer is the?

A	Combustion blower
B	Heat exchanger
C	Burner
D	Accumulator

Question 36

Two common methods used to seal a sectional heat exchanger are?

A	Mechanical crimp and iron banding
B	Welded seam and Pittsburgh seam
C	Iron banding and Pittsburgh seam
D	Welded seam and mechanical crimp

Question 37

A bimetal flame sensor

A	Proves the existence of a pilot flame
B	Proves the existence of the main gas flame
C	Uses a normally open set of contacts to control the pilot valve
D	Uses a normally closed set of contacts to control the main valve

Question 38

A flame rod sensor

A	Proves the presence of a pilot flame only
B	Proves the presence of a main burner flame only
C	Proves the presence of a pilot or main burner flame
D	Proves the presence of the spark from an ignition system

Question 39

A normally open float switch should be wired to control

A	The blower motor
B	The contactor coil
C	The condensate pump
D	The inducer motor

Question 40

An induced draft blower used in a condensing gas furnace?

A	Produces positive pressure in the vent system when properly installed
B	Produces a positive pressure in the heat exchanger
C	Pulls the products of combustion from the heat exchanger and pushes them into the venting system
D	Pushes the products of combustion into the heat exchanger then into the venting system

Question 41

In what type of furnace is a secondary heat exchanger used?

A	A high efficiency non condensing type
B	A high efficiency condensing type
C	A standing pilot system
D	A mid efficiency non condensing type

Question 42

What is the purpose of the secondary heat exchanger?

A	To increase the temperature of the products of combustion for added efficiency
B	To increase the quantity of the products of combustion for added efficiency
C	To increase the velocity of the products of combustion for added efficiency
D	To condense the products of combustion for added efficiency

Question 43

Which control is used to disconnect all electrical power supply to the furnace, which will prevent the products of combustion from mixing with supply air?

A	The limit control
B	The auxiliary limit control
C	The pressure switch
D	The interlock switch

Question 44

What control is used to start the operation of the induced draft blower of a high efficiency condensing furnace?

A	The pressure switch
B	The auxiliary switch
C	The thermostat
D	The end switch

Question 45

What control is used to energize the ignition control on the start up of a high efficiency condensing furnace?

A	The end switch
B	The auxiliary limit control
C	The pressure switch
D	The pilot safety switch

Question 46

A tech suspects a crack in the heat exchanger of a high efficiency condensing furnace; he blocks off the intake and exhaust pipe and connects a manometer to the small hose leading to the pressure switch, he then energizes the blower on high speed at the thermostat (fan ON). What reading will be obtained if there is a crack in the heat exchanger?

A	A negative pressure reading
B	A positive reading
C	A reading of 0”WC
D	Any of the above

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Tek Assist - NATE Core and Specialties Tests

Controls and Components

Controls and Components

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