The laws of thermodynamics can help us to understand what heat is all about.

PSIG indicates ____.

The Fahrenheit scale is used in the English measurement system by the United States.

The temperature on the Celsius scale where all molecular activity stops is ____.

Atmospheric pressure in inches of mercury (in. Hg) decreases

_______ in. per 1000 feet increase in elevation.

Earth’s atmosphere exerts a weight or pressure of

_____ psi at sea level.

A Bourdon tube is often found in a(n) ____.

The standard atmospheric pressure at sea level is ____.

How many Btus are required to change five pounds of ice at 20°F to steam at 220°F?

Raising the vapor temperature above the boiling point is called

A gauge that reads pressures above and below atmospheric pressure is known as

_________ gauge.

The difference in the volume of two substances will determine the heat transfer rate between the substances.

Temperature can be thought of as ____.

The Celsius equivalent of 80°F is ____

The Celsius absolute scale is called the

Which of the following represents a different temperature than the other three?

Heat that changes the temperature of a substance is called

_________ heat.

PSIA at sea level under standard conditions is

Pure water boils at a temperature of 212°F at which of the following standard conditions?

The difference in the level of heat between two substances will determine the heat transfer rate between the substances.

As the temperature of a material increases, the molecules in the material ____.

The Fahrenheit absolute scale is called the

______ scale.

Water boils at 212°C.

In heat _____ or hidden heat, heat is known to be added, but no temperature rise is noticed.

Of the following choices, the warmest temperature is ____.

Water at 0°F has no heat energy or molecular activity.

Temperature difference does not affect heat transfer rate.

When water at 212°F boils, it is only absorbing latent heat.

How many Btus must be removed from one pound of water at 200°F for it to end up as ice at 30°F?

Both sensible heat and latent heat transfers can be read with a thermometer.

In order for water at 60°F to boil, it must absorb both sensible and latent heat.

The amount of heat needed to change the temperature of a substance will vary with the type of substance. This heat quality is called the ____ of the substance.

How many Btus are required to change one pound of ice at 20°F to steam at 220°F?

The two common temperature scales used by air conditioning and refrigeration technicians are called

_______ and _______ .

The temperature on the Fahrenheit scale where all molecular biology activity stops is ____.

A solid material exerts a pressure or force ____.

A liquid material exerts a pressure or force ____.

A vapor material exerts a pressure or force ____.

If the temperature remains constant and the volume that a gas occupies increases, the pressure will ____.

The volume of gas varies inversely with the absolute pressure, provided the temperature remains constant. This is called ____.

At a constant pressure, the volume of a gas varies as to the absolute temperature and at a constant volume the pressure of the gas varies directly with the absolute temperature. This is known as ____.

The total pressure of a confined mixture of gases is the sum of the pressures of each of the gases in the mixture. This is known as ____.

The unit used to measure electrical power is the ____.

One watt of electrical energy is equal to ____.

How many watts of electrical power are equal to 1 horsepower?

Specific volume is the term used to indicate the space a weight of gas will occupy.

As heat is applied to a closed container containing a gas, the pressure inside the container will decrease.

An example of a fossil fuel is hydrogen.

A law of conservation of energy states that energy is neither created nor destroyed.

Heat is a form of energy because of the motion of molecules.

What happens when room temperature soda is poured into a glass of ice?

Ice melts in iceboxes because _____.

High temperature refrigeration is that produced by _____.

Refrigeration can be described as:

The temperature inside the refrigerator fresh food section should be about:

The relationship correlates the vapor pressure and the boiling point of water and is the basis for controlling the cooling system's temperature.

The ___ are used to change the vapor to a liquid and the liquid form back into a vapor, the refrigeration cycle.

The evaporator in a refrigeration system ___ .

Reciprocating compressor have:

The condenser ___.

When a refrigerant enters the compressor, it is a ___, and when it leaves the compressor, it is a ___.

The evaporator in a refrigeration system must be colder than the refrigerated space in order to absorb heat.

The boiling point of a refrigerant should be low enough at atmospheric pressure to keep the system pressure above 0 psig when operating at low temperatures.

The compressor in a refrigeration system:

Good ventilation is important when working around refrigeration equipment because modern refrigerants:

The only location where the refrigerant vapor is superheated is in the evaporator.

Only liquid refrigerant should enter the metering device.

The discharge gas from the compressor is a high pressure, high temperature, superheated vapor.

The halide leak detector should be used in well ventilated areas as the resulting blue or green flame indicates that phosgene gas is being produced.

An expansion valve is the pressure reducing device that controls the flow of liquid refrigerant into the evaporator.

Which of the following statements is correct when referring to large refrigerant or nitrogen tanks?

An example of a pressure vessel is ___

A fusible plug is a metal fitting that has a hole drilled through it and the hole is filled with ___

When transferring refrigerants from a cylinder to a refrigeration system or any other container, you should always wear ___

When it is necessary to perform electrical work in an area that has a damp or wet floor, which of the following can be done to minimize the chance of electrical shock?

Electrical power should always be shut off at the ___ or entrance panel and locked out in an approved manner when installing equipment.

A double insulated drill ___

In electrical circuits, the ___ wire protects the operator.

Fires that involve ordinary materials such as paper, cardboard, and wood are classified as Type ______ fires.

Fires that involve ordinary materials such as oil and gas are classified as Type ______ fires.

Fires that involve electrical equipment are classified as Type ______ fires.

Fire extinguishers that can be used on any type of fire, A, B, or C, generally contain a ______ to extinguish the fire.

When working in a machine room, safety glasses should not be worn because they can fog up and impede your eyesight.

It is possible that your hand would suffer frostbite if it comes in contact with liquid R-22 when accidentally releasing refrigerant into the atmosphere (an illegal procedure).

As long as the torch is kept moving below the level of the liquid refrigerant in the cylinder so as not to create a hotspot, it is OK to heat the cylinder in this manner.

To insure proper operation of an oxygen cylinder regulator, make sure no oil residue is present.

Aluminum ladders are safe to use around electrical equipment as long as they have insulation pads on the bottom of the rungs.

A necessary safety practice for a technician is to lockout the panel with a padlock and keep the key with you.

If you are a refrigeration technician, a warm coat and gloves should be in your truck, even in the middle of the summer.

Punch, lever, and die are all types of _________.

A tap is used to cut external threads and a die is used to cut internal threads.

Tubing benders should be used for bending _________.

The tool used to remove air and noncondenseable gases from a refrigeration system is __________.

A ___________ is used to change pins in a charged system or to evacuate a system faster.

A megohmmeter is used to test ______________.

A test instrument that can measure things such as voltage, current, resistance, and microamps is called a ____________.

A combustion analyzer can measure levels of _________ in flue gas.

A digital vacuum gauge measures a vacuum in microns and may have other scales as well.

An electronic leak detector can be used to locate leaks in a system that is charged with _____________, depending on the model.

Two types of screwdriver bits are Toggle and Torx.

A wiring and crimping tool is used to

Socket with ratchet handle, open end, box end, combination, adjustable, and open end are all types of:

A flaring tool is used to

Two types of refrigerant leak detectors are ultrasonic and electronic.

A vacuum pump is used to

An air-acetylene kit is used for leak checking refrigerant lines.

A type of fastener used to provide secure anchoring in building block, plaster over lath, and hollow tiles is a:

Wood screws generally have:

______ is used to secure objects to a shaft.

A hardened steel wire bent into a "U" with an angled point on both ends that is driven into wood is called a:

Stranded wire should not be directly connected under a screw terminal because the strands of wire may separate and cause a poor connection.

Ring tongue, spade tongue, pigtail, and hook tongue are all types of _______.

Fasteners that are used to hold a component either onto a shaft or inside of some type of housing and can be either internal or external are called _______.

Screw-on wire connectors are also referred to as solderless terminals and are used to join two or more wires.

Threaded rod can be attached to steel I-beams using a _______.

Flat, round, pan, fillister, and oval are all types of _______.

For fastening two pieces of rough lumber together, the nail used would be a _______.

For recessing the nail for filling and finishing the wood surface, the nail used would be a ____.

For fastening a pipe strap to a cement wall, the nail used would be a ____.

To fasten a duct hanger strap to a floor joist, the nail used would be a ____.

An outward clinch tacker is used to ____.

Pins or blind rivets are assembled on a pin often called a(n) ____.

The hole drilled in sheet metal for a tapping screw should be the approximate size of the ____.

In the machine screw dimension "5/16 - 18 UNC-2," the 5/16 indicates the ____.

In the tapping screw dimension "6-20 x 1/2 type AB, slotted hex," the term 20 indicates the ____.

To secure a flexible duct onto a duct collar, the best fastener would be a(n) ____.

Nails are sometimes coated with zinc to protect them from corrosion.

A pin rivet must be installed in a properly sized, pre-drilled hole.

A wall anchor is a one-time fastener.

A toggle bolt is a one-time fastener.

A pipe strap is a very versatile fastener as one size fits all sizes of pipe.

Perforated strap is a very versatile fastener as it can be used on all sizes of pipe.

Changing an instrument's output or reading to correspond to a standard reading is called ________.

Temperature-measuring instruments measure the temperature of _________.

For an accurate reading, the thermometer must be __________.

Thermometer accuracy is more important in lower temperature ranges where small temperature differences can translate into larger percentage errors.

______________ can be used as reference to check the accuracy of a gauge manifold.

When checking an ohmmeter for accuracy, resistors with a _______% tolerance are usually acceptable for the needs of an HVAC/R technician.

Ohm's Law will hold for DC-powered circuits that are used to operate inductive loads.

The red fluid used with some flue-gas analysis instruments is _____________.

The two most common flue-gas analysis kits are the ___________ kits.

When checking the accuracy of a pressure-measuring instrument, it must be checked both above and below atmospheric pressure.

All instruments can be calibrated

Common reference points used to check the accuracy of temperature-measuring instruments are boiling water (212°), water and crushed ice (32°), and:

To check the temperature leads of an electronic thermometer for low temperatures, they should be stirred in a container of crushed ice, water, and a tablespoon of salt.

Temperature-measuring instruments may be designed to measure the temperature of solids, liquids, and vapors.

Pressure test instruments measure pressures only above atmospheric pressure.

A pressure gauge can be checked by connecting it to a cylinder of refrigerant with a known temperature and comparing the pressure reading with that on a temperature/pressure relationship chart.

What type of charge does an electron have?

If five electrons combine with three protons, the net charge will be ____.

What part of an atom moves from one atom to another?

Typical insulators are ____.

The ampere is ____.

If two light bulbs are wired in series and one bulb burns out, the other bulb will ____.

What happens to the current in a circuit if the resistance is increased?

An element in an electric heating unit is connected to a 232-V power supply. The current flow through the element is 19 A. What is the resistance of the element?

As loads are added in a parallel circuit, the total resistance of the circuit _____.

To find the watts of electrical power in an electrical circuit, you multiply _____ together.

If a conductor carrying electrical current is formed into a coil, the magnetic field around the wire will _____.

Ohmmeters are to be used only on circuits that are de-energized.

In a circuit with two or more resistances in series, the total resistance in the circuit is the sum of the resistances.

In a circuit with two or more resistances in parallel, is the total resistance in the circuit the sum of the resistances?

When calculating the total resistance of a parallel circuit, will the result always be lower than the lowest resistance?

Is one kilowatt of electrical energy equal to 1,000,000 watts?

If a conductor carrying electrical current is formed into a coil, will the strength of the magnetic field generated by the wire increase?

Is the unit of measurement for the charge a capacitor can store called a Joule?

As the diameter of a wire increases, does its resistance also increase?

Are copper wire sizes measured in circular mils?

Where Does Superheat Occur

Where Does Subcool occur