Nate Exam Prep

Front 1

What is the Formula for calculating power in an electric circuit?

Back 1

P=I x E

Front 2

How much airflow is required for a 3 Ton system?

Back 2

1200 CFM

Front 3

What is the Total Resistance of a Circuit that has 3 30 Ohm Resisters in Parallel?

Back 3

10 OHMS

Front 4

If Guage Pressure is 30 PSI What is Absolute Pressure?

Back 4

44.7 PSIG

Front 5

Enthalpy includes both ___________ and _____________ Heat Energy?

Back 5

Sensible and Latent

Front 6

The Theoretical Temperature at which all molecular motion stops is called ______________?

Back 6

Absolute Zero

Front 7

An Ampere is defined as Current equal to ?

Back 7

One Coulomb per Second

Front 8

What is the symbol for Voltage?

Back 8

E

Front 9

How much current does a 100 Watt lighbulb draw at 120 Volts?

Back 9

.83 Amps

Front 10

The Sensitivity of a Voltmeter is Measure in ?

Back 10

Ohms per Volt

Front 11

Name 2 types of Ice Machines

Back 11

Cubed and Flaked

Front 12

How much ice does a commercial Ice machine produce in 24 Hours?

Back 12

50 to 5000 LBS

Front 13

What further categories are Ice machines divided into?

Back 13

Self-contained and Modular

Front 14

Is Ice considered a food product?

Back 14

Yes

Front 15

Ice machines most frequently require maintenance within what system?

Back 15

Water System

Front 16

What is "Stack Effect"?

Back 16

The tendancy of Air to Flow in and out of a building caused by lighter, rising warm air transfering with colder, denser air to and from inside and out.

Front 17

How does a Heat Anticipator Work?

Back 17

A Heat Anticipator causes the thermostat to sense a temperature higher then the actual room temperature

Front 18

How are low voltage contacts of a thermostat usually activated?

Back 18

By the movement of Bi-Metal

Front 19

Is the Heat Anticipator powered during the heating cycle or the OFF cycle?

Back 19

Heating

Front 20

Name 3 Lubrication problems that can cause compressor failures?

Back 20

Insufficient Oil, Loss of oil in the crankcase, Failure of the oil pump.

Front 21

Most workplace injuries can be avoided by practicing

Back 21

Good judgement and Caution

Front 22

List 3 types of eye protection that should be worn on the job.

Back 22

Goggles, Face Shields, and Spectacles with Side Shields

Front 23

What steps should be take following a workplace accident?

Back 23

1) Report accident to employer or supervisor
2) Notify affected parties
3) Current codes and regulations should be followed.
4) Serious accident sites should remain undisturbed

Front 24

Refrigerant cylinders should be transported in what position.

Back 24

Upright, secured

Front 25

Name 4 categories of Hazerdous atmospheres.

Back 25

Flammable, Toxic, Irritant, Asphyxiating

Front 26

Asphyxiation can occur when the oxygen supply is depleted by what two occurances?

Back 26

Consumption and Displacement

Front 27

List 4 general types of hazards associated with electricity.

Back 27

Burn, Blast,Shock, Related (Falling off ladder)

Front 28

When using electric power tools you must make sure they are _____ or ____.

Back 28

Grounded or Double Insulated

Front 29

When is it permissible to improperly size fuses?

Back 29

Never

Front 30

An electric shock of as little as _____ can cause the victim the inability to let go.

Back 30

5ma

Front 31

How does a ground fault circuit interrupter work?

Back 31

It detects an imbalance between line and neutral current and disconnects the source power.

Front 32

What classification is given to Electrical Fires?

Back 32

Class C

Front 33

What is the first step of the Lockout procedure?

Back 33

Notify everyone concerned that you will be working on the equipment.

Front 34

Heat is a form of?

Back 34

Kinetic Energy

Front 35

Stored energy is called __________ energy.

Back 35

Potential

Front 36

Heat transfers from ______ to ______?

Back 36

Hot to Cold

Front 37

What type of heat is associated with a change of state?

Back 37

Latent Heat

Front 38

What type of heat can be measured with a typical thermometer?

Back 38

Sensible

Front 39

THe amount of heat required to raise the temperature of 1 lb of a specific substance 1 degree Farenheit is called __________.

Back 39

Specific Heat

Front 40

Define cold.

Back 40

Reduced amount of Heat

Front 41

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 the temperature.

Back 41

Solid to Liquid

Front 42

The amount of energy required to change 1 lb of a substance from the liquid phase to the vapor phase without changing the temperature is called the ___________ of the substance.

Back 42

Latent Heat of Vaporization

Front 43

When the liquid and vapor phases of a substance exist together, and no more liquid can vaporize without adding more energy. The vapor is said to be _______________.

Back 43

Saturated

Front 44

When a vapor is heated to a temperature higher then its saturation point, both the added heat and the temperature difference is called ________.

Back 44

Superheat

Front 45

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

Back 45

Evaporation

Front 46

A capacitor is made up of 2 metal plates separated by a?

Back 46

Dielectric

Front 47

Define Capacitance

Back 47

Opposition to DC Current Flow

Front 48

How can a capacitor's value be increased?

Back 48

Increase the plate size, change the dielectric, distance between plate or add capacitance in parallel.

Front 49

What determines the safe working voltage of a capacitor?

Back 49

The Voltage Rating

Front 50

A start capacitor usually has a ________ value of capacitance and a ________ voltage rating than a run capacitor.

Back 50

Higher, Lower Opposite is true of Run Capacitors