Practice quizzes 5/5

Question 1

What term is used to describe a burner flame that moves back through the burner nozzle?

Delayed ignition
Lazy flame
Flashback

Answer 1

c

Question 2

Through which device is fuel discharged to an atmospheric burner?

Orifice
Burner venturi
Burner ports

Answer 2

a

Question 3

Which type of atmospheric burner produces a single large flame?

Induced draft
Single or mono-port burner
Forced draft

Answer 3

b

Question 4

Drilled port, drilled pipe, slotted port, and ribbon port are all types of what?

Single port atmospheric burners
Radiant head atmospheric burners
Multiport atmospheric burners
Pulse combustion atmospheric burners

Answer 4

c

Question 5

What is the recommended maximum port diameter for drilled port atmospheric burners?

No. 29 drill
No. 12 drill
No. 42 drill
No. 56 drill

Answer 5

a

Question 6

What is the recommended minimum port diameter for drilled port atmospheric burners?

No. 56 drill
No. 12 drill
No. 42 drill
No. 29 drill

Answer 6

c

Question 7

What type of burner has combustion air supplied by a fan or blower under sufficient pressure to overcome the restriction of the burner and the appliance?

Fan assisted burner
Natural draft burner
Forced draft burner

Answer 7

c

Question 8

Match the appropriate word(s) to best complete the following statements:

a. The ______ burners use a mechanical device to mix the required amounts of air and gas before ignition

b. The _______ type of burner uses air under pressure to entrain gas at atmospheric pressure

c. The _________ burner provides complete premixing with mechanical mixers

Answer 8

a) premix

b) aspirator

c) blower-mix

Question 9

What type of burner has a fan located downstream of the combustion zone?

Forced draft burner
Induced draft burner
Atmospheric burner

Answer 9

b

Question 10

What device is used to regulate gas supply to an aspirator-type burner?

Zero governor
Orifice
Blower mixer

Answer 10

a

Question 11

Which atmospheric burners are most susceptible to flashback?

Ribbon burners
Ring burners
Mono-port

Answer 11

c

Question 12

What helps to keep the flame retained at the burner port of a mono-port burner?

Gas pressure
Flame spreader
Crimped ring

Answer 12

c

Question 13

What is a “multiport” burner susceptible to?

Clogging with lint from the inside
Delayed ignition
Sooting

Answer 13

a

Question 14

Which of the following is not a way in which heat is transferred?

Vibration
Conduction
Radiation
Convection

Answer 14

a

Question 15

In which direction does heat energy flow?

It flows from cold to warm
It flows from warm to cold

Answer 15

b

Question 16

What happens when a fluid is heated?

It expands and becomes lighter
It reduces volume.
It boils

Answer 16

a

Question 17

What controls the drying period of a gas-fired clothes dryer?

The thermostat
Moisture sensor or timer
The high limit

Answer 17

b

Question 18

What normally controls the automatic gas valve found on a forced warm-air furnace?

The fan limit control
The air circulating fan
A thermostat mounted in the space being heated

Answer 18

c

Question 19

Where is the blower located on a down-flow furnace?

Above the heat exchanger
Below the heat exchanger
At the same level as the heat exchanger

Answer 19

a

Question 20

Name two ways in which the burner can be controlled on a unit heater.

Opening a window, manual shut off valve on the gas line
A wall-mounted thermostat, manual switch

Answer 20

b

Question 21

What factor must be considered when installing swimming pool heaters that would not be a concern with a hot-water space-heating boiler?

High flow rate
Low return water temperature
Thermostat location

Answer 21

b

Question 22

Which of the following conditions are not regulated in a Category 1 hot water boiler?

Firing of the boiler
Boiler water temperature
Venting pressure
Circulating pump

Answer 22

c

Question 23

Which type of water heating system can be used for both domestic hot water supply and space heating?

Combination unit
Any power vented water heater.
Fin-type boiler

Answer 23

a

Question 24

How is the heat directed to the floor in a low-intensity infrared heater?

By the use of ceiling fan
Through convection
The tubes radiate heat to the reflectors which in turn direct the heat to the floor

Answer 24

c

Question 25

What three types of gas-fired units are used to heat a single room or other small areas? Room space heaters, Wall furnace, Baseboard heater Room space heaters, Steam boiler, Baseboard heater Baseboard heater, Room space heater, Infrared heater

Answer 25

a

Question 26

Indicate True or False: Many gas-fired rooftop units provide both heating and cooling functions. True False

Answer 26

true

Question 27

What is the purpose of an operating aquastat? To maintain water pressure in a boiler system. To ensure water flow. To energize or de-energize the main gas valve in response to the water temperature.

Answer 27

c

Question 28

Is the temperature setting of a high-limit aquastat higher or lower than the setting of the operating aquastat? Lower Higher The same

Answer 28

b

Question 29

Does the furnace fan continue to run if the high-limit switch opens the furnace control circuit? Yes No

Answer 29

yes

Question 30

What causes the contacts of a steam boiler operating pressuretrol to open? The water level in the boiler increases A rise in steam pressure The water level in the boiler decreases

Answer 30

b

Question 31

What activates a flame roll-out switch? Spillage of flue products from the draft hood opening The opening of the high limit A rise in temperature

Answer 31

c

Question 32

Senses the operation of a circulating pump = ____-______

Answer 32

flow-switch

Question 33

Senses air movement using a paddle attached to a micro-switch = ________ switch

Answer 33

pressure switch

Question 34

Allows water to escape if temperature or pressure exceeds a preset value inside a hot water heater = _____

Answer 34

T&P

Question 35

Turns a boiler or water heater on and off to maintain a desired water temperature = ________ aquastat

Answer 35

operating

Question 36

Shuts down the burners in the event of a failure to vent flue products from the combustion chamber = ______ _______ ______

Answer 36

flame rollout switch

Question 37

What does an outdoor reset control system do in a hydronic heating system?

Answer 37

boiler temperature matches outdoor temperature

Question 38

What are the two sensors involved in outdoor reset control?

Answer 38

1. indoor water temperature 2. ambient outdoor temperature

Question 39

What does the outdoor temperature sensor sense?

Answer 39

outdoor temperature

Question 40

What does the indoor temperature sensor sense?

Answer 40

indoor water temperature

Question 41

What is a thermistor?

Answer 41

resistance is dependant on temperature changes

Question 42

What type of thermistor is used for an outdoor temperature sensor?

Answer 42

NTC - negative temperature coefficient

Question 43

The troubleshooting procedure is broken down into a series of specific steps. What should be your first step? Make a trial run Test conclusions Know the system Replace the components

Answer 43

c

Question 44

Suppose that upon testing a furnace, the fan motor will not run. The burner is operating, the heat exchanger temperature is above the fan-on setpoint and the fan switch contacts are open. What should you do? Replace the fan Replace transformer Replace the fan switch Replace the thermostat

Answer 44

c

Question 45

Suppose the furnace will not light, thermostat is calling for heat and you get a reading of 24 V across the thermostat connections. Replace transformer Replace the gas valve Replace the fan switch Replace the thermostat

Answer 45

d

Question 46

List Thermostats are an example of a control that can be recalibrated or readjusted. True False

Answer 46

a

Question 47

What setting should the multimeter be on when testing the flame sensing circuit? µAmps DC µVolts AC µAmps AC µVolts DC

Answer 47

a

Question 48

All IFC will have a fault code retrieval push button on the module. True False

Answer 48

b

Question 49

Using the fault code table in Illustration 4, what component, and its connections, should be tested if the IFC red light is flashing one short flash following by one long flash? Ignitor Blower Gas valve Flame sensor

Answer 49

c