ATT FC COMP EXAM QUESTIONS AND ANSWERS (VERIFIED ANSWERS) (2024/2025).

ATT FC COMP EXAM QUESTIONS AND ANSWERS (VERIFIED ANSWERS) (2024/2025). What three factors determine the severity of an electric shock? - ANSWER 1) Amount of current flowing through the body, 2) Path of current through the body, 3) Length of time the body is in the circuit How much current can be lethal? - ANSWER 50-150 milliamperes How much more DC than AC does it take to freeze a body to a conductor? - ANSWER 5 times: 12 ma AC, 60 ma DC What are three types of burns? - ANSWER 1) Electrical, 2) Arc, 3) Thermal Contact What are three well-known examples of electrical protection devices - ANSWER 1) Fuse, 2) Circuit Breakers, 3) Ground-Fault Circuit Interrupters (GFCIs) Never use ____ or ____ to extinguish an electrical fire because they are electrically conductive substances. - ANSWER water, foam What are the 4 steps that should be taken in the case of an electrical fire? - ANSWER 1) de-energize, 2) call the fire department, 3) control / put out the fire, 4) report fire Schematic diagrams are drawn so that the date or signal flows through the circuit from ____ to ____. - ANSWER left, right What are the two methods to troubleshoot a circuit? - ANSWER 1) trial and error, 2) logical procedure What are the four steps to troubleshooting a circuit? - ANSWER 1) Analyze the circuit, 2) Check the setup, 3) Calculate and measure values, 4) Check the results. What are three characteristics of an open? - ANSWER 1) infinite resistance, 2) no circuit current, 3) measure applied voltage What are three characteristics of a short? - ANSWER 1) no resistance, 2) increases circuit current, 3) measures 0 voltage What are the three characteristics of a changed value? - ANSWER 1) resistance increases or decreases, 2) increases or decreases circuit current, 3) measures voltage other than calculated What is a representation of AC voltage or current? - ANSWER The sine wave ____ is determined by the number of cycles that occur in one second. - ANSWER Frequency What is the basic unit of measurement for frequency? - ANSWER the Hertz (Hz) ____ is the length of time required to complete one cycle of an AC sine wave. - ANSWER Period The symbol for period is ____? - ANSWER T Time is expressed as a ____. - ANSWER decimal part of a second The formula for period is ____. - ANSWER T = 1 / f ____ is the distance from beginning to end of one complete cycle of an AC sine wave. - ANSWER Wavelength The symbol for wavelength is ____. - ANSWER λ (lambda) Wavelength is expressed in ____ or ____. - ANSWER meters or centimeters The formula for wavelength is ____. - ANSWER λ = 300 x 10^6 / f - where f is Hertz A changed value component changes ____ and ____. - ANSWER ZT, IT A ____ eliminates the component from the circuit. - ANSWER short The purpose of a transformer is to ____. - ANSWER transfer power For transformers power in ___ power out. - ANSWER always equals The transformer schematic symbol uses two ____. - ANSWER inductor symbols What is the reference designator for a transformer? - ANSWER T In a transformer, the ____ receives the input voltage. - ANSWER primary coil In a transformer, the secondary coil receives the ____. - ANSWER induced voltage Transformers operate on the principle of ____. - ANSWER mutual inductance ____ transformers increase the applied voltage. - ANSWER Step-up ____ transformers decrease the applied voltage. - ANSWER Step-down What is the turns ratio formula? - ANSWER NP / NS - where N means number of coils .