HVACR - UNIT 33 QUESTIONS WITH 100% COMPLETE SOLUTIONS, GRADED A+

A technician uses an ohmmeter to check resistance and for a complete path in the electrical circuit, also known as: - Continuity. A wattmeter is connected to a circuit with 120 V, 10 A, and a power factor of 91.7%. Its reading is: - 1,100 W. An ohmmeter is set on continuity and beeps when the leads are connected to a circuit. This indicates that: - The circuit path is complete. Before attempting to use an electric meter to measure the circuits on a system, the technician should: - Understand how the unit and the meter work. Besides the normal electrical functions found on general-purpose multimeters, what additional functions are common on multifunction meters intended for HVACR use? - Temperature, microfarads, and frequency Capacitance meters measure the capacitance in a circuit or in a start capacitor. This is measured in what unit? - Microfarads How are clamp-on ammeters used? - They are clamped around one of the power wires feeding the circuit. How are inline ammeters connected to read the current in a circuit? - They are connected in series with the load. How are voltmeters connected to read the voltage drop across a load in a circuit? - Voltmeters are connected in parallel with the load. How can a technician determine what the proper PPE is for a particular application? - Read NFPA Standard 70E.How does a weighted average meter measure alternating current? - It takes an average over a short period of time. Meter functions commonly used for air-conditioning troubleshooting include: - Volts, amps, and ohms. One advantage of digital meters is: - There is no need to interpret the scale. Root-mean square (RMS) is a mathematical formula for: - Calculating the electrical power passing through a alternating current circuit. The range of an electric meter describes: - How low and high the meter will read for each function. The safest way to use a meter while testing for voltage is to: - Rest the meter on something; do not hold it. This test instrument reads current in an electrical circuit. - Ammeter Wattmeters read true power in a circuit. This can be expressed by what equation? - Power = amps × voltage × power factor What category of electric meter is intended for measurement at the electric meter base? - Category IV What category of electric meter is intended only for measurement inside an appliance? - Category I What could happen to an analog meter if a voltage is tested that exceeds the setting on the meter? - The meter can be damaged.What is a common application for data logging instruments? - Identifying intermittent problems What is a transient voltage? - A momentary surge or spike of voltage that can be several times the normal circuit voltage What is the operating principle of an analog voltmeter? - Current passes through a coil, which creates magnetism that moves a needle. What part of an analog scale gives the most accurate reading? - The midpoint of the scale What scales on analog meters require battery power to operate? - Only the ohms scale What should you look for on the meter besides a CAT rating? - A certification from an independent laboratory