unit 11

What is the purpose of calibrating an instrument?

• To change the instrument's output to correspond to a standard or correct reading

• To increase the instrument's size

• To make the instrument more colorful

• To decrease the instrument's weight

Which type of instrument typically stays calibrated longer?

• Electronic instruments with digital readout features

• Analog meters with a needle

• Mechanical clocks

• Manual thermometers

What do analog meters use to indicate value readings?

• A needle on the meter face

• A digital screen

• A sound alarm

• A color-changing light

What is necessary to check and calibrate instruments?

• Reference points for comparison

• A new battery

• A larger display screen

• A protective case

How can you determine cylinder pressure from a known cylinder temperature?

• By using a thermometer

• By using a P/T chart

• By using a voltmeter

• By using a hygrometer

What feature do gauge dials have for calibration?

• Temperature sensors

• Calibration screws

• Pressure valves

• Humidity indicators

What is the primary function of a refrigeration gauge manifold?

• To measure the temperature of the refrigerant

• To control the flow of refrigerant in the system

• To measure the pressure of the refrigerant

• To filter impurities from the refrigerant

What is used to check ohmmeters according to the learning material?

• High-quality resistors

• Low-quality resistors

• High-voltage capacitors

• Low-voltage capacitors

What can the voltage scale of a voltmeter be compared against?

• Other voltmeters

• Other ammeters

• Other ohmmeters

• Other capacitors

Clamp-on ammeters can be compared against what?

• Another ammeter reading

• Another voltmeter reading

• Another ohmmeter reading

• Another capacitor reading