Air conditioning and refrigeration reversible ratchet wrenches are used to ____.

Variable speed reversible electric drills can be used to drill holes as well as tighten and loosen screws.

The odd shape of the Torx type screw driver is the square shaft used to tighten or loosen set screws.

A programmable charging scale measures the volume of refrigerant flow into a refrigeration system.

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 ____.

Pin 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 ____.

A "blind rivet" is used when you cannot see the two pieces of metal that you are joining.

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

To fasten a duct hanger to a gypsum board wall, the best fastener would be an anchor shield.

A wall anchor is a one-time fastener.

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

Temperature can be thought of as ____.

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

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

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

The Celsius equivalent of 80°F is ____.

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

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

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.

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

Water boils at 212°C.

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

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

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

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

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

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.

A vapor material exerts a pressure or force ____.

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 ___.

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.

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

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

Ice melts in iceboxes because ____.

The temperature inside the refrigerator fresh food section should be about ____.

A ton of refrigeration is equal to ____.

The ____ relationship correlates the vapor pressure and the boiling point of water and is the basis for controlling the cooling system’s temperatures.

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

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

The compressor in a refrigeration system ____.

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

Which of the following refrigerants has the lowest boiling temperatures at atmospheric pressure?

If a cylinder of R-22 is moved from a 100°F truck body into an 80°F shop, the quantity of liquid refrigerant in the cylinder will remain the same.

The evaporator can be thought of as a "heat sponge."

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

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.

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.

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.

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

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

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.

To check the temperature leads of an electronic thermometer for low temperature, they should be stirred in a container of ____.

To check the temperature leads of an electronic thermometer for high temperature, they should be ____.

If the ammeter is off by more than _____%, it should be sent to the repair shop.

The ____ is used most frequently for amperage checks.

Ohm's law is represented with the formula: _____.

A device commonly used for detecting refrigerant leaks is a(n) ____.

____ can detect leak rates of about 1/4 oz per year.

Flue-gas analysis instruments analyze products of combustion from fossil-fuel–burning equipment, such as oil and gas furnaces and ____.

Stirring the ice and water with the thermometer will increase the accuracy of the thermometer reading.

It is important to note that Ohm’s law, as written, will hold for AC-powered circuits that are used to operate resistive-type loads.

Water boils at 220°F at sea level under standard atmospheric conditions.

You should not spray pure refrigerant into the sensing element of a leak detector.

What type of charge does an electron have?

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

The ampere is ____.

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

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.

If three bulbs are wired in parallel and one bulb burns out, the total current of the circuit will decrease.

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

The unit of measurement for the charge a capacitor can store is called a Joule.

Copper wire sizes are measured in circular mils.

A single diode can be connected as a full wave rectifier.

When checking a diode with an ohmmeter and the meter shows a resistance, if the meter leads are reversed, it should show infinity.