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117 Cards in this Set

  • Front
  • Back
The ability to utilize all types of communication skills is ____ to the HVACR technician.

Very Important

Itis important to be ____ in filling out service orders so that office staff,other technicians, and customers will know what work you completed on the job



When explaining to a customer that you haveadjusted the system charge, what term should you use?


Listening carefully to what a customer is tellingyou ____.
can help you diagnose the problem

When you arrive at a service call and meet thecustomer, you should ____.

Listen to the customer first,then ask questions

What is the volume of a room that measures 10 ftby 20 ft with an 8-ft ceiling?


1,600 ft3

What is the formula for finding CFM requirementsfor a house?
CFM=SQft x ceiling x air changes /60

What is the cross-sectional area of a 10-inround metal duct?

Note: Area of a circle = π x radius^2

79 in2

How do you find velocity pressure of a duct?

Velocity = 4005 x (thesquare root of velocity pressure

Customers depend on you to be ____.




Before leaving a service call, you should besure to ____.

Demonstrate system operation anddescribe basic maintenance procedures to the customer.
What is the advantage of using a tube cutter tocut copper pipe?

It can cut hard or soft drawn copper

It leaves no metal shavings to contaminate the system

It produces a clean, square cut

Spring-type benders may be used on ____.

Soft drawn copper

A flaring tool is used to ____.

Make a mechanical joint in tubing.
A swaging tool is used to ____.
Solder tubing without the use of couplings
What is one of the advantages of a glass-stemthermometer?
It is very accurate
In discussing human comfort, the temperaturemost commonly referred to is ____.

A sling psychrometer uses two glass-stemthermometers. One measures,______ and the other measures ____.



A standard refrigeration manifold uses what type of element to measure pressure?
Bordon tube

What is the pressure range of a standard-compound gauge on a refrigerant manifold?

30 in. Hg to 500 psig

What is the best tool for removing moisture andnon-condensibles from a system before adding refrigerant?
Vacuum pump

A vacuum gauge reads pressure in ____.

Which of the following is not a method of leakdetection?

To prevent the release of refrigerant to the atmosphere while removing it from a system, what type of equipment must be used?

Recovery machine
An anemometer uses a small fan blade to measure____.
Air velocity

What is one of the advantages of using silverbrazing rods for copper-to-copper joints?

No flux is required

“Housekeeping" includes ____.

Disposal of waste

Fire prevention and protection

Proper storage of materials

What type of eye protection should you wear when drilling overhead?

What agency regulates cylinders and chemicalstransported in a service vehicle?


Material safety data sheets ____.

Contain information about personal protective equipment

When should oxygen be used in a refrigeration system?

Which of the following classifications of fire extinguishers should be used for electrical fires?
Class C is an electrical fire, extinguishing agent: carbon chemicals, extinguishing agent: foam dioxide
Which of the following categories could beconsidered a hazardous atmosphere in a confined space?



Which of the following best describes anasphyxiating atmosphere?
Low oxygen level
If a ladder is placed against a wall that is 20ft tall, what is the proper distance away from the wall for the base of the ladder?
For every 4ft up the ladder needs to be 1ft out at the bottom

5 ft

When using a ladder, you should always ____.

Maintain three points of contact

What is one of the most important safety precautions that you can take when working on electrical equipment?

Disconnect and lock out power before starting unless testing requires the power to be on
When does a ground fault circuit interrupter open an electric circuit?
When current travels through a ground path other than the neutral
Proper lockout/tag out procedures state thatlocks placed on a lockout device may be removed ____.
Only by the person who installed the locks
A natural cooling process produced by moistureon the skin changing to low-pressure steam is called ____.
During the heating season, human comfort can be enhanced without changing the temperature of the air by ____.
adding moisture
During the cooling season, dampers on bypass humidifiers should be ____.
Completely closed
All matter can exist as a ____.



Stored energy is called ____ energy.

Heat that you can feel and measure directly witha thermometer is called ____ heat.

The heat energy change associated with a phase(state) change is called ____ heat.
The amount of heat (Btu) needed to raise the temperate of 1 lb of a substance 1°F is called the ____ heat of the substance.

The latent heat of fusion is the amount of energy required to change 1 lb of a substance from the ____ phase to the ____phase without changing its temperature.

Liquid, Solid
At 32°F, 1 lb of ice can be changed to 1 lb of water by adding ____ Btu.
144 Btu
At 212°F, 1 lb of water can be changed to 1 lbof steam by adding ____ Btu.
970 Btu
When liquid and vapor phases of a substance exist together, and no more liquid can vaporize without more energy being added,the vapor is said to be ____.
When a vapor is heated to a temperature higherthan its saturation point, both the added heat and the temperature above saturation are called ____.

The process of molecules escaping from the surface of a liquid is called ____.


The process of a solid turning directly into a vapor without going through the liquid state is called ____.

The continuous movement of molecules within a liquid or gas is called ____ energy.


Enthalpy includes both ____ and ____ heatenergy.

Latent, Sensible

The measurement of the force that gravity exertsis called ____.


The amount of matter in a substance is called____.


Weight per unit volume or mass per unit of volume is called ____.


Volume per unit of mass or weight is called____.

Specific volume

Under standard conditions, air weighs approximately ____ lb/ft3.

0.075 lb/ft3

Convert Fahrenheit temperature Celsius.

C= (F-32)/1.8

Convert Celsius to Fahrenheit.

F= (1.8xC) +32

If the absolute temperature of a gas is doubled,under constant pressure the volume will be ____.

What is the formula to figure the change ofvolume of Air when temperature change is applied?
Volume is VF=VI (Tf/Ti)


I= Initial


How do you find absolute pressure?
Gauge pressure + 14.7
The law that applies to the total pressure exerted by a mixture of gases or vapors is called ____ .
Dalton's Law

A coulomb is a charge of ____ electrons.

6.28 x 10^18

An ampere is a measurement of ____.

Electron flow
Voltage is best described as the ____.
Force that moves electrons through a circuit

Current in a circuit is limited by ____.

A substance that permits the free movement ofelectrons is called a (n) ____.

Which of the following conductors would have the least resistance?Ashort, large-diameter conductor

A short, large-diameter conductor

If the voltage in a circuit is doubled and the resistance remains the same, the current will ____.


What is the voltage of a circuit if the resistance is 5Ω and the current is 5 A?

25 V

A circuit has a voltage of 10 V and a current of 5 A. What is the resistance?

2 Ω

The total resistance of a series circuit is equal to the ____.

Sum of all the resistances in the circuit
The total current in a parallel circuit is ____.
The sum of the currents through the individual paths
The rate of doing work is called ____.

One kilowatt is equal to ____.

1,000 W U

The following equations is used to solve for electric power?

P = E x I

P = I^2 x R

P = E^2 / R

What is the power in a circuit that has acurrent of 10 and a resistance of 10Ω?
1 kW
The voltage induced in each turn of the secondary coil of a transformer is ____.
The same as the voltage induced per turn of the primary coil
The load rating of a transformer is stated in ____.

An A/C induction motor consists of a stationarypart called the ____ and a rotating part called the ____.

Stator, Rotor

What is the synchronous speed of a three-phasemotor that has six poles and is operated on a 60-Hz alternating current?

1,200 RPM
How does the power factor of an inductive motoraffect efficiency?
The lower the power factor, the less efficient the motor is.
Which of the following single-phase ac motorsdoes not have a start winding?
A centrifugal switch opens the start winding circuit when a capacitor-start motor reaches approximately ____% of its fullspeed.
75 to 80%

A run capacitor is always connected to the ____and ____ terminals.

Start, Run

Terminal No. 1 on all potential relays is always connected to the ____.

Start capacitor

Note: Terminal No. 1 on all potential relays is always connected to the start capacitor. Terminal

No. 2 is always connected to the start winding terminal on the motor or compressor. Terminal

No. 5 is always connected to the common terminal of the motor or compressor.

The coil of a voltage relay is between terminal____ and terminal ____ of the relay.

2, 5
What type of ac motor has the highest startingtorque and the greatest efficiency?

How many terminals does a dual-voltage three-phase motor have?
The primary function of any wiring diagram is to____.
Aid the technician in finding the problem
How many functions is an individual circuit in acontrol system designed to control?

The five basic components common to all schematics are a power supply, a path, a load, a legend, and a ____.


The intention of the overall schematic is toshow how the circuit ____.

The type of schematic that provides the most helpful troubleshooting information for the service technician is the ____diagram.
Devices that consume power and convert it tosome other form of energy, such as motion or heat, are ____.

The normal dividing line for voltage changes ina schematic is the ____.

The part of the schematic that lists and explains the system components is called the ____.
Relays and contactors are ____ control switches.
Electrically operated
A (n) ____ circuit allows the same current toflow through all of the components.

A (n) ____ circuit has multiple paths forcurrent flow.

What types of circuits are primarily used in control and safety applications?

When testing with a voltmeter, you should place the meter ____.

In parallel with the circuit being tested

What does a resistance rating of 0Ω indicate?

There is a short circuit
When you use an ohmmeter, the circuit beingmeasured must be ____.
Isolated from all energy sources
When you test a switch with an ohmmeter, a reading of ____ indicates that the switch is closed.
0 Ω
On all meters, digital and analog, the scaleused should indicate the measurement ____.
Close to the middle of the range
When testing across a closed switch in an energized circuit, you should read ____.
0 V ac
When using a standard clamp-on ammeter, youshould ____ before taking a reading.
Make sure that the jaws are closed
When testing compressor windings, you take thefollowing readings:

C to R: 2 Ω

C to S: infinite resistance

R to S: infinite resistance

What is the diagnosis?

The start winding is open
Capacitance meters must be used on capacitors____.
That have been removed from the circuit
When testing a thermostat wire that has been removed from the circuit, you measure 0 Ω between red and white. This indicates that ____.
There is a short

When testing with an ammeter, you should place the meter ____.

In series with the circuit being tested