Filters
Question type
Study Flashcards

Three products of complete combustion of natural and LP gas are carbon dioxide, water vapor, and _________________________.

Correct Answer

verifed

verified

Spark ignition is important for roof top or package units located outdoors because of ____________________ problems.

Correct Answer

verifed

verified

Why do propane and butane gas furnaces require 100% shut off in the event of pilot outage?

Correct Answer

verifed

verified

Propane and butane g...

View Answer

The gas flame will lift off the burner and be noisy if it receives too much primary air.

Correct Answer

verifed

verified

Primary air adjusters on atmospheric type gas burners are usually ____.


A) butterfly shutters
B) sliding sleeves
C) spoiler screws
D) all of the above

Correct Answer

verifed

verified

Butterfly shutters and sliding sleeves are examples of _________________________ and are used on atmospheric type gas burners.

Correct Answer

verifed

verified

primary ai...

View Answer

A furnace with a vertical air flow through the heat exchanger and the blower compartment beneath the heat exchanger is called a(n) ____.


A) upflow
B) downflow
C) low boy
D) horizontal

Correct Answer

verifed

verified

While the furnace is operating, heated air and flue products spill out of the burner compartment. What is the problem?

Correct Answer

verifed

verified

The problem is the r...

View Answer

On a gas furnace, what energizes the blower motor in the heat mode?

Correct Answer

verifed

verified

A temperature sensing switch in the chamber energizes the blower motor.

A condensing gas furnace uses ____ from a condensing type heat exchanger to increase the furnace efficiency.


A) sensible heat
B) latent heat
C) superheat
D) subcooling

Correct Answer

verifed

verified

B

When a gas furnace ignites and is under "full-fire," why does the fan not come on immediately?

Correct Answer

verifed

verified

The chamber must war...

View Answer

If flue gases are not vented properly, carbon monoxide poisoning could result.

Correct Answer

verifed

verified

What is the difference between a yellow gas flame and an orange gas flame?

Correct Answer

verifed

verified

A yellow flame represents an a...

View Answer

Another name for a downflow heating unit is ____________________.

Correct Answer

verifed

verified

In a conventional gas furnace, the hot flue gases are ____.


A) forced out a PVC vent with a blower
B) recycled through a secondary heat exchanger and then vented through a draft diverter
C) forced through a type B vent by a blower
D) vented by natural convection

Correct Answer

verifed

verified

Match the furnace with its correct description.

Premises
primarily used in crawl spaces
blower located below heat exchanger
return and supply ducts are both on top
blower located above heat exchanger
Responses
upflow
low boy
horizontal
downflow

Correct Answer

primarily used in crawl spaces
horizontal
blower located below heat exchanger
upflow
return and supply ducts are both on top
low boy
blower located above heat exchanger
downflow

A gas furnace designed for use with natural gas can be used with liquified petroleum (LP) with no system modifications.

Correct Answer

verifed

verified

The flame in a gas fired furnace is burning with heavy yellow tips. What is the problem?

Correct Answer

verifed

verified

There is not enough ...

View Answer

Liquified petroleum (LP) is heavier than air and can cause suffocation if not handled properly.

Correct Answer

verifed

verified

When the burners ignite, the burner flame is normal until the blower starts. At this time, continuous roll out occurs. What is the problem?

Correct Answer

verifed

verified

The problem is a hole in the h...

View Answer

Showing 1 - 20 of 27

Related Exams

Exam 1

Heat and Pressure

45 Questions

Exam 2

Matter and Energy

32 Questions

Exam 3

Refrigeration and Refrigerants

38 Questions

Exam 4

General Safety Practices

31 Questions

Exam 5

Tools and Equipment

30 Questions

Exam 6

Fasteners

32 Questions

Exam 7

Tubing and Piping

45 Questions

Exam 8

Leak Detection, System Evacuation and System Clean-Up

33 Questions

Exam 9

Refrigerant and Oil Chemistry and Managementrecovery, Recycling, Reclaiming, and Retrofitting

39 Questions

Exam 10

System Charging

27 Questions

Exam 11

Calibrating Instruments

34 Questions

Exam 12

Basic Electricity and Magnetism

46 Questions

Exam 13

Introduction to Automatic Controls

30 Questions

Exam 14

Automatic Control Components and Applications

34 Questions

Exam 15

Troubleshooting Basic Controls

33 Questions

Exam 16

Advanced Automatic Controlsdirect Digital Controls Ddc and Pneumatics

35 Questions

Exam 17

Types of Electric Motors

36 Questions

Exam 18

Application of Motors

33 Questions

Exam 19

Motor Controls

31 Questions

Exam 20

Troubleshooting Electric Motors

30 Questions

Exam 21

Evaporators and the Refrigeration System

37 Questions

Exam 22

Condensers

35 Questions

Exam 23

Compressors

35 Questions

Exam 24

Expansion Devices

29 Questions

Exam 25

Special Refrigeration System Components

35 Questions

Exam 26

Application of Refrigeration Systems

34 Questions

Exam 27

Commercial Ice Machines

35 Questions

Exam 28

Special Refrigeration Applications

27 Questions

Exam 29

Troubleshooting and Typical Operating Conditions for Commercial Refrigeration

34 Questions

Exam 30

Electric Heat

29 Questions

Exam 32

Oil Heat

35 Questions

Exam 33

Hydronic Heat

35 Questions

Exam 34

Indoor Air Quality

35 Questions

Exam 35

Comfort and Psychrometrics

35 Questions

Exam 36

Refrigeration Applied to Air Conditioning

31 Questions

Exam 37

Air Distribution and Balance

35 Questions

Exam 38

Installation

32 Questions

Exam 39

Residential Energy Auditing

35 Questions

Exam 40

Typical Operating Conditions

25 Questions

Exam 41

Troubleshooting

28 Questions

Exam 42

Heat Gain and Heat Loss in Buildings

35 Questions

Exam 43

Air Source Heat Pumps

35 Questions

Exam 44

Geothermal Heat Pumps

31 Questions

Exam 45

Domestic Refrigerators and Freezers

35 Questions

Exam 46

Room Air Conditioners

34 Questions

Exam 47

High-Pressure, Low-Pressure, and Absorption Chilled-Water Systems

35 Questions

Exam 48

Cooling Towers and Pumps

30 Questions

Exam 49

Operation, Maintenance, and Troubleshooting of Chilled-Water Air Conditioning Systems

28 Questions

Exam 50

Commercial Rooftop, Packaged, Variable Refrigerant Flow, and Variable Air Volume Systems

35 Questions

Show Answer