Study Guide Flashcards
Difference between a feature & a benifit?
A FEATURE is a special characteristic of a product & a BENEFIT is the value the customer receives from using the feature.
Dry bulb reading
The temperature most often used by customers when discussing human comfort.
What is an honest person
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.
The volt
The unit of electrical pressure.
How is line voltage only represented
Each leg of the line voltage is represented by two lines on the side of a ladder diagram.
Humidifiers and heating systems
Humidifiers are used with heating systems to raise relative humidity with increased customer comfort.
Temperature humidity and cleanliness of the air
Factors that contribute to comfort in a home or building
Care should be taken before sawing basement wall that are part of the original construction of a home because?
These walls are typically loadbearing.
Refrigerant vapor in high concentrations should not be inhaled because
They may cause heart, irregularities or unconsciousness
Damper used with a bypass humidifier
Must be open in the winter.
Capillary tubing should only be cut to length
Using a triangular or knife edge file
When connecting a volt meter for taking voltage readings
The voltmeter must be connected in parallel with the voltage to be measured
A motor can have 2, 4 or more poles
The fewer the number of poles, the faster, the motor turns.
Changing the connected, tap changes the CFM even on the no blower load.
True.
A conventional thermometer with a moistened cloth wick covering its sensor.
Wet bulb thermometer.
Amperes
units on which electrical current is measured on.
When climbing up or down a ladder, the worker must
always face the latter.
To be certain that the instrument you are using can be used you must
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.
According to ohms law, when the voltage to an electric heating element is increased by 10%
The current through the element increases by 10%
Hacksaws should never be used to cut copper tubing because
Saw chips can remain inside the tubing
Combustion is
A chemical process.
Because they are very accurate
Liquid filled thermometers are often used in sling psychrometers
A pictorial schematic is useful for
Quickly visualizing each component in a unit.
A sling psychrometer can measure wet bulb and dry bulb temperature
Yes, these measurements are then used to compute relative humidity
Motors of of 5 hp that are used with bill driven fans are typically
240/460 three
As static pressure increases in a system with a constant airflow blower motor
The amp draw Increases with the static.
Perseverance
Persistence on doing something despite difficulties.
Current flows in one direction in a DC circuit
True
D.O.T
The Federal regulatory agency with jurisdiction over the shipping and labeling of refrigerants
As a general rule, a continuity check, using an ohmmeter shows continuity by
A reading at zero or a specific resistance.
Analog VOM
An electrical meter that displays volts ohms or milliamperes on an analog scale.
“Auto ranging” Multimeter
Automatically set itself for range of approximate value when set for volts, amps or ohms.
Primary side of a transformer.
The input side of a step down transformer.
