Study Guide

Question 1

Difference between a feature & a benifit?

Answer 1

A FEATURE is a special characteristic of a product & a BENEFIT is the value the customer receives from using the feature.

Question 2

Dry bulb reading

Answer 2

The temperature most often used by customers when discussing human comfort.

Question 3

What is an honest person

Answer 3

One who is free from fraud or deception, creditable and is marked with integrity. And honest person is fair in their dealings with other people.

Question 4

The volt

Answer 4

The unit of electrical pressure.

Question 5

How is line voltage only represented

Answer 5

Each leg of the line voltage is represented by two lines on the side of a ladder diagram.

Question 6

Humidifiers and heating systems

Answer 6

Humidifiers are used with heating systems to raise relative humidity with increased customer comfort.

Question 7

Temperature humidity and cleanliness of the air

Answer 7

Factors that contribute to comfort in a home or building

Question 8

Care should be taken before sawing basement wall that are part of the original construction of a home because?

Answer 8

These walls are typically loadbearing.

Question 9

Refrigerant vapor in high concentrations should not be inhaled because

Answer 9

They may cause heart, irregularities or unconsciousness

Question 10

Damper used with a bypass humidifier

Answer 10

Must be open in the winter.

Question 11

Capillary tubing should only be cut to length

Answer 11

Using a triangular or knife edge file

Question 12

When connecting a volt meter for taking voltage readings

Answer 12

The voltmeter must be connected in parallel with the voltage to be measured

Question 13

A motor can have 2, 4 or more poles

Answer 13

The fewer the number of poles, the faster, the motor turns.

Question 14

Changing the connected, tap changes the CFM even on the no blower load.

Answer 14

True.

Question 15

A conventional thermometer with a moistened cloth wick covering its sensor.

Answer 15

Wet bulb thermometer.

Question 16

Amperes

Answer 16

units on which electrical current is measured on.

Question 17

When climbing up or down a ladder, the worker must

Answer 17

always face the latter.

Question 18

To be certain that the instrument you are using can be used you must

Answer 18

1)-Insert the rate test lead plug into red common jack an instrument.
2)-Insert the black test lead into black Mv jack on instrument.
3) connect the test probes across the circuit to be measured.
4)-read millivolt on the 0–50 scale.

Question 19

According to ohms law, when the voltage to an electric heating element is increased by 10%

Answer 19

The current through the element increases by 10%

Question 20

Hacksaws should never be used to cut copper tubing because

Answer 20

Saw chips can remain inside the tubing

Question 21

Combustion is

Answer 21

A chemical process.

Question 22

Because they are very accurate

Answer 22

Liquid filled thermometers are often used in sling psychrometers

Question 23

A pictorial schematic is useful for

Answer 23

Quickly visualizing each component in a unit.

Question 24

A sling psychrometer can measure wet bulb and dry bulb temperature

Answer 24

Yes, these measurements are then used to compute relative humidity

Question 25

Motors of of 5 hp that are used with bill driven fans are typically

Answer 25

240/460 three

Question 26

As static pressure increases in a system with a constant airflow blower motor

Answer 26

The amp draw Increases with the static.

Question 27

Perseverance

Answer 27

Persistence on doing something despite difficulties.

Question 28

Current flows in one direction in a DC circuit

Answer 28

True

Question 29

D.O.T

Answer 29

The Federal regulatory agency with jurisdiction over the shipping and labeling of refrigerants

Question 30

As a general rule, a continuity check, using an ohmmeter shows continuity by

Answer 30

A reading at zero or a specific resistance.

Question 31

Analog VOM

Answer 31

An electrical meter that displays volts ohms or milliamperes on an analog scale.

Question 32

“Auto ranging” Multimeter

Answer 32

Automatically set itself for range of approximate value when set for volts, amps or ohms.

Question 33

Primary side of a transformer.

Answer 33

The input side of a step down transformer.