Modern Refrigeration and Air Conditioning - Chapter Review Questions
A ladder being used to access an upper area should extend at least _________ above the step off surface.
3 feet - pg 37
A hacksaw with _______ teeth per inch is used to cut thin metal, tubing, and hard metal.
32 - pg 120
HVACR generally falls into the ________ career?
Architecture and Construction - pg 6
Before dealing with an electrical fire, make sure that the fire extinguisher is rated _________________.
Class C - pg 26
__________ law states that in a confined mixture of gases, the pressure of each gas must be added to calculate the total pressure.
Dalton's - pg 83
All persons who intend to install, maintain, service, or repair HVACR equipment should first acquire ______________________.
EPA certification - pg 17
The career requiring the highest level of education and licensing is an HVACR ________.
Engineer - pg 7
__________ law states that if volume is held constant, temperature varies directly with pressure.
Gay-Lussac's - pg 81
When cutting or removing asbestos, run a ventilation system with a(n) _________ filter.
HEPA - pg 33
The initial setup of HVACR equipment and systems is _________ work.
Installation - pg 6
The national code that covers workplace safety is __________.
OSHA - pg 24
For proper fire extinguisher use, remember the initials _________.
P.A.S.S. - pg 28
Temperatures measured on the __________ scale can be converted to Fahrenheit temperatures by subtracting 460 degrees Fahrenheit.
Rankine - pg 60
Fixing and performing maintenance on existing systems is _______ work.
Service - pg 6
Into which tank can a technician pump a refrigeration system's entire refrigerant charge to perform service?
The liquid receiver - pg 96
A storage tank that traps liquid refrigerant on the low side of the system is a(n)__________.
accumulator - pg 99
When you are troubleshooting and servicing a unit, quick and hasty decisions may result in __________.
additional and identical service work required later, necessary callbacks, and the unit being only temporarily fixed - pg 45
A cooling affect can be generated through _________.
air exchange, pressure change, and state change - pg 84
Another name for a hex key wrench is a(n) _________.
allen wrench - pg 110
When should you push and pull on a wrench?
always pull - pg 106
A ton of refrigeration effect is defined as the __________.`
amount of heat energy absorbed when a ton of ice melts during one 24-hour day - pg 68 & 69
HVACR state licensing generally requires:
an application fee, HVACR work experience, and passing a licensing exam - pg 19
Define troubleshooting.
analysis of a problem, labor that corrects a problem and the use of instruments to solve a problem - pg 44
Professional behavior includes:
analyzing a situation for a workable solution, maintaining a positive attitude, and work as a team - pg 16
Building inspectors ensure that a building project adheres to _________.
applicable codes - pg 9
An application process will usually involve the following paperwork:
application form, cover letter, resume - pg 12
An accumulator will function best with its inlet positioned __________ the tank.
at the top of - pg 99
According to Pascal's law, if a piston applies pressure to fluid in a sealed cylinder, the pressure will __________.
be applied equally and undiminished to all surfaces of the cylinder - pg 75
Employers value good work habits. These include:
being dependable, punctual, and responsible - pg 15
What size wrench is used to loosen a 1/8" bolt?
below 1/2" bolt size, the wrench size is 3/16" larger than the bolt size - 2/16" + 3/16" = 5/16" - pg 106
A sudden uncontrolled release of refrigerant could cause the following:
blindness, frostbite, and skin damage - pg 28
An energy auditor generally performs the following tests:
blower door test, duct tightness test, thermal imaging - pg 9
A refrigeration system with a(n)_________ metering device does NOT use a liquid receiver.
capillary tubes - pg 96
Latent heat is heat added to a substance that ________.
causes the substance to change state - pg 67
A heat-exchanging device designed to expel or reject heat is a(n) _________.
condenser - pg 95
__________ is the method by which heat is transferred from one substance to another through a circulating medium, such as air or water.
convection - pg 66
The way a business interacts with customers is called _________.
customer relations - pg 47
Mainly used for cutting wires, _________ have angled jaws for making nearly flush cuts.
diagonal pliers - pg 113
Drill bit sizes are specified by the _________ of the hole they create.
diameter - pg 117
The density of a substance is defined as the mass of the substance _________.
divided by its volume - pg 57
Which of the following could be used to describe a box wrench?
double-ended, offset, double offset - pg 108
Which of the following are common types of punch?
drift, pin, prick, and center - pg 119
The law of conservation of energy states that __________.
energy can be changed from one form to another, energy cannot be created, energy cannot be destroyed - pg 56
To develop a bid, an estimator generally adds together the cost of the following:
equipment and materials, labor and time required, permits and inspections - pg 8
A heat-exchanging device designed to absorb heat is a(n) ___________.
evaporator - pg 98
To protect a system from dirt, moisture, metal, and other debris, install a(n) _________.
filter-drier - pg 97
The instantaneous evaporation of liquid refrigeration in an evaporator is called _________.
flash gas - pg 97
Heat flow can best be described as ________.
flowing from hot areas to cold areas - pg 95
The weight of a substance is defined as the __________.
force of gravity acting on the substance - pg 56
A condenser that uses a fan to remove heat more quickly is call a _________ condenser.
forced-air - pg 95
Because many refrigerant vapors are heavier than air, a confined space must have _________.
good ventilation - pg 30
Relative density is defined as the ratio of the mass of a certain volume of a gas as compared to the mass of an equal volume of hydrogen. Knowing this concept and that density is mass per volume, a heavy gas would then have a relative density _________.
greater than 1 - pg 57
When cutting a hole into masonry to install an anchor for an outdoor condensing unit, the best tool to use is a _________.
hammer drill - pg 122
If an environment requires workers to raise their voices to be heard, _________ protection is likely warranted.
hearing - pg 33
An elevated body temperature, headache, nausea, weakness, dizziness, fainting, and confusion are signs of _________.
heat-related illness - pg 28
Which tool is used to remove a screw with a hexagonal indent in the head?
hex key wrench - pg 110
From the compressor exhaust through the condenser and liquid line to the metering device is the ________ side of the system.
high - pg 91
___________ refrigeration is like a soaking wet sponge that cannot absorb more water.
high-pressure vapor - pg 90
The __________ the pressure on a substance, the _________ the temperature needed to bring about a change of physical state.
higher, higher - pg 77
To quickly remove or tighten fasteners for unit assembly, the best tool to use is a(n) __________.
impact driver - pg 122
According to the combined gas law, if the pressure of a gas is held constant as its temperature is increased, then the volume of the gas __________.
increases - pg 82
Why is the procedure given in a troubleshooting chart a good method to use?
it saves time, money and frustration - pg 45
If a substance has a specific gravity less than 1.0, it means that the substance is _________.
less dense than water - pg 57
The high-pressure line between condenser and metering device is called the _________ line.
liquid - pg 97
A storage tank for liquid refrigerant on the high side of the systems is a(n) __________.
liquid receiver - pg 96
From the metering device through the evaporator to the compressor is the ___________ side of the system.
low - pg 91
Using suction, a compressor draws in refrigerant by creating ________ in the evaporator.
low pressure - pg 91
___________ refrigeration is like a dry sponge that has the ability to soak up a lot of water.
low-pressure liquid - pg 90
A _________ is used to drive parts together without damaging them.
mallet - pg 113
Which file type has only single-cut teeth?
mill - pg 119
Critical pressure is the __________.
minimum pressure at which a gas at its critical temperature can condense - pg 76
Characteristics of good leadership include:
motivating others, serving as a good role model, and solving problems - pg 15
A career search is enhanced by ________, which is the process of connecting with other individuals within a group or industry.
networking - pg 11
A gas is any physical substance that has __________.
no definite volume or shape and expands to fill its container - pg 74
What is the first step in troubleshooting?
obtain a description of the problem - pg 45
Which type of wrench can be used to access a bolt head or nut from the side?
open end wrench - pg 109
The two main classifications of energy are __________.
potential and kinetic - pg 56
__________ is the rate at which work is performed.
power - pg 58
Using the process of compression, a compressor increases refrigerant __________.
pressure and heat content - pg 92
According to the definition and the formula for pressure, is the area increases, __________.
pressure decreases - pg 74
A saturated vapor will condense if the _________.
pressure of the vapor is increased and the temperature is decreased - pg 84
Since nitrogen cylinders can be charged to such high internal pressure, a ________ is necessary when using the nitrogen.
pressure regulator - pg 30
Commonly used in different HVACR applications, _________ compressors use a back-and-forth or up-and-down motion.
reciprocating - pg 93
A(n) _________ wrench is used to open and close service valves.
refrigeration service valve - pg 111
Which of the following is an example of repair work?
replacing a failed compressor - pg 44
When handling toxic or corrosive liquid chemicals, wear __________ gloves.
rubber or plastic - pg 36
When working in a very dusty environment, __________ should be used for eye protection.
safety goggles - pg 34
Heat energy can be categorized as latent heat and _______ heat.
sensible - pg 67
Objects that float on water have a ________.
specific gravity less than 1 - pg 57
The _________ of a substance is the amount of heat added or released to change the temperature of 1 lb of the substance by 1 degree Fahrenheit or 1 kg of the substance by 1 degree Kelvin.
specific heat capacity - pg 62
The low-pressure line is sometimes call the _________ line.
suction - pg 100
When working where there is a limited amount of oxygen in the air (less than 19.5%), use a(n) __________ as respiratory protection.
supplied-air respirator - pg 35
After an interview for a position, send a _________ to the interviewer(s).
thank-you letter - pg 12
With whom should a technician first speak when troubleshooting a problem?
the building owner - pg 45
What does the first column in a troubleshooting chart list?
the problem - pg 46
Why do units with maintenance agreements last longer and have fewer breakdowns?
the units are tuned-up on a regular schedule, units are cleaned on a regular schedule, and written analysis of the system is kept - pg 51
Enthalpy is the _________.
total amount of heat in a substance, calculated from an accepted reference temperature - pg 64
Replacing a working blower fan with a new fan that is more energy efficient is an example of which type of service work?
upgrade/system addition - pg 44
A good method of preventing electrical hazards is to __________.
use a lockout/tagout (LOTO) practice - pg 24
When storing or transporting refrigerant cylinders, they should be kept __________.
vertical with the valve at the top - pg 29
