ATT COMP TEST (FC) EXAM QUESTIONS & ANSWERS | 100% VERIFIED SOLUTIONS | LATEST!! GRADED A+| GUARANTEED PASS

ATT COMP TEST (FC) EXAM QUESTIONS & ANSWERS | 100% VERIFIED SOLUTIONS | LATEST!! GRADED A+| GUARANTEED PASS “What is electrical Shock? - CORRECT ANSWER A sensation and muscular spasm when electric current passes through the body." "Arc burns are what? - CORRECT ANSWER Electrical current flowing through tissue or bones" "A _______ ________ fuse will typically blow in about one second, while a ________ ________ could take 1-30 seconds. - CORRECT ANSWER Fast acting; slow blow" "What happens to the current path if the wire in a fuse melts? - CORRECT ANSWER It stops." "What do the following letters mean in a basic schematic diagram? C, D, Q, S, T, TP, AVC - CORRECT ANSWER C - Capacitor, D - Diode, Q - Transmitter, S - Switch, T-Transformer, TP - Test Point, AVC - Automatic Volume Control" "voltage drop - CORRECT ANSWER The difference in voltage across an electrical device that has current flowing through it." "Wavelength is what? - CORRECT ANSWER The actual distance between the beginning and end of a cycle." "What is induction? - CORRECT ANSWER The generation of AC current by passing a conductor through a magnetic field." "How many cycles per second is a frequency of 100 Hz? - CORRECT ANSWER 100." "What is a capacitor made of? - CORRECT ANSWER Two parallel plates separated by a dielectric." "A partial short in the primary of the transformer will _____________ secondary voltage. - CORRECT ANSWER Increase" "What is the output frequency of a half wave rectifier? - CORRECT ANSWER Same as input." "How many diodes does a full wave rectifier have? - CORRECT ANSWER Two." "What are three steps for repairing digital systems? - CORRECT ANSWER Fault detection, isolation, and correction." "An IC's internal malfunctions make its operation _______________. - CORRECT ANSWER unpredictable" "What are the three most common IC faults? - CORRECT ANSWER Opens, shorts, and faulty power supply units." "What component changes color to indicate an element change is needed in dry air systems? - CORRECT ANSWER Telltale oil filters." "What type of cooling is used in sealed enclosures? - CORRECT ANSWER Air-to-air." "What cooling system uses chilled water for both standby and normal operation? - CORRECT ANSWER Type 3." "Signal tracing - CORRECT ANSWER If no fault found after voltage or current measurements, next trace signal with a logic probe." "Two types of signal tracing? - CORRECT ANSWER Sequential and half splitting." "What is the purpose of a transformer? - CORRECT ANSWER To increase or decrease voltage depending on requirements of the load." "What does Pout equal in a transformer? - CORRECT ANSWER Pin." "What principle do transformers operate on? - CORRECT ANSWER Mutual inductance." "What is mutual inductance in transformers? - CORRECT ANSWER The ability of magnetic field of one coil to induce voltage in the second coil." "A step-down transformer _____________ output voltage in the secondary. - CORRECT ANSWER decreases" "A step-up transformer ___________ output voltage in the secondary. - CORRECT ANSWER increases" "What is a GFCI? - CORRECT ANSWER Ground Fault Circuit Interrupter (automatically shut's off electrical flow in the event of an overload)" "TS Transformers - CORRECT ANSWER Open: T doesn't generate output V Short: could be partial which would then change number of coils so Ep would change or Es" "What is voltage - CORRECT ANSWER Potential of electric energy; pressure of electrons pushing away from each other." "Current is defined as __________________________. - CORRECT ANSWER a flow of electric charge" "What are some factors affecting shock? - CORRECT ANSWER Amount of current, path of current, amount of body resistance, and length of time current flows in body" "What is not a primary factor in severity of an electric shock? - CORRECT ANSWER The general health of the victim." "Ways to prevent shock? - CORRECT ANSWER Isolate, insulate & ground" "What is the minimum AC current required to cause severe muscle contractions? - CORRECT ANSWER 12 mA" "How much more DC is required to freeze the body than AC? - CORRECT ANSWER 5 times more" "What types of burns are there? - CORRECT ANSWER Electrical burns, arc burns, and thermal contact burns" "Electrical burns are what? - CORRECT ANSWER Electrical current flowing through tissue or bones" "Thermal contact burns are what? - CORRECT ANSWER When skin comes in contact with hot surfaces of overheated electrical conductors" "Factors of electrical accidents - CORRECT ANSWER Unsafe equipment, unsafe environment, and unsafe work practices" "What should you do first if someone has been shocked? - CORRECT ANSWER Remove the victim from the source." "What type of protection is worn when use of a tool produces sparks and debris? - CORRECT ANSWER Safety goggles." "What category includes electrical fires? - CORRECT ANSWER Class C." "Switches have __________ resistance when closed, and ____________ resistance when open. - CORRECT ANSWER minimum, maximum" "Type of switches - CORRECT ANSWER Toggle, slide, rotary, and push button. Single or double pole and throw." "Fuses and circuit breakers are both protection devices, however, while fuses are not ____________, circuit breakers are. - CORRECT ANSWER reusable" "Are capacitors circuit protection devices? - CORRECT ANSWER No." "Applied voltage - CORRECT ANSWER Sum of all voltage drops in the circuit." "Faults in series are: - CORRECT ANSWER Open, Short, Changed value" "What are the four basic TS steps? - CORRECT ANSWER A)Analyze circuit B)Check Setup C)Calculate/measure values D)Check Results" "What fault provides no resistance to current flow? - CORRECT ANSWER A short." "What fault causes resistance to increase or decrease? - CORRECT ANSWER A changed value." "What fault causes current to stop? - CORRECT ANSWER An open." "In a series parallel open, current ___________ in parallel and series, while the voltage drop ____________ due to an ______________ in total resistance. - CORRECT ANSWER decreases; increases; increase" "TS procedures should be __________ and ____________. - CORRECT ANSWER logical; systematic" "An open wire will measure ___________ resistance. - CORRECT ANSWER maximum" "Current is measured in an open circuit when the leads are placed in what way? - CORRECT ANSWER Across the open." "Shorts have a voltage drop of ____. - CORRECT ANSWER zero" "What three characteristics needed for sine wave? - CORRECT ANSWER Frequency, period, wavelength." "To induce a current, three things are needed: - CORRECT ANSWER A conductor, a magnetic field, and relative motion" "Peak value is: - CORRECT ANSWER The voltage or current value of a waveform at its maximum positive or negative points." "How effective is AC vs DC? - CORRECT ANSWER AC is only 70.7% as effective as DC." "What is peak-to-peak voltage? - CORRECT ANSWER Voltage of a sine wave measured from the most negative to the most positive point." "What is the formula for finding a period of a wavelength? - CORRECT ANSWER T = 1/f" "What is the period of a 100 Hz sine wave? - CORRECT ANSWER 0.01" "Formula for a wavelength? - CORRECT ANSWER (300 X 10^6)/f" "What quantity cannot be measured directly or derived from oscilloscope? - CORRECT ANSWER Resistance" "A/an ___________ is a component that has the ability to concentrate a magnetic field. - CORRECT ANSWER inductor" "What are the three types of inductors? - CORRECT ANSWER Air core, iron core, and variable." "Inductance - CORRECT ANSWER basic unit is Henry (H, big so usually mH), ability of conductor to induce(generate) V when cut by mag F." "What factors determine the amount of inductance? - CORRECT ANSWER Number of turns of wire, distance between windings, cross sectional area of core, and permeability of core." "What are the types of capacitors? - CORRECT ANSWER Non polarized, electrolytic, and variable." "What is capacitance? - CORRECT ANSWER The ability of a conductor to store energy in the form of electrically separated charges." "What factors affect capacitance? - CORRECT ANSWER Plate size, distance between plates, and dielectric material." "What occurs when positive current hits a capacitor plate? - CORRECT ANSWER It builds up a positive charge." "Transistors - CORRECT ANSWER Control a large current with a small current." "Emitter - CORRECT ANSWER Heavily doped so it emits larger # of current carriers inside semi conductive material." "Base - CORRECT ANSWER Very thin and lightly doped, allows most current carriers to pass between emitter to collector." "Collector - CORRECT ANSWER Moderately doped, largest area, dissipates heat. Receives most current carriers." "What two types of signals applied to transistors? - CORRECT ANSWER Input and bias." "An open in the primary of a transformer won't do what? - CORRECT ANSWER Produce current in the secondary." "An open in the secondary of a transformer prevents an output voltage in _____ _________ ________________. - CORRECT ANSWER the open secondary" "A complete short in the secondary transformer will ____________ secondary voltage. - CORRECT ANSWER eliminate" "Current flowing through a relays contacts in one direction can only cause what failure? - CORRECT ANSWER Coned and cratered contacts." "What tool should be used to clean relay contacts? - CORRECT ANSWER A burnishing tool." "How do you fix a sealed relay? - CORRECT ANSWER Replace the entire relay." "What does quiescent mean? - CORRECT ANSWER Inactive; at rest, but ready to operate." "Power supplies does what? - CORRECT ANSWER Converts AC power to DC power." "A power supply contains five sections. What are they? - CORRECT ANSWER Input, rectifier, filter, regulator and protection." "Power supply input - CORRECT ANSWER Applies AC signal." "Power supply rectifier - CORRECT ANSWER Converts AC to pulsating DC." "Power supply filter - CORRECT ANSWER Changes pulsating DC to smooth DC." "Power supply regulator - CORRECT ANSWER Maintains output voltage." "Power supply protection - CORRECT ANSWER Prevents damage to power supply if load shorts." "Which two parts of a power supply are optional? - CORRECT ANSWER Regulator and protection." "There are three types of rectifiers. What are they? - CORRECT ANSWER Half wave, full wave, bridge." "Describe a half wave rectifier. - CORRECT ANSWER 1 diode. Looks like a filter." "Why is full wave more efficient than half wave? - CORRECT ANSWER It uses the entire input." "What is the output frequency of both a full wave and bridge rectifier? - CORRECT ANSWER Twice the input frequency (180° out of phase)." "How many diodes does a bridge rectifier have? - CORRECT ANSWER Four." "Which internal IC can produce signals that show three different volt levels? - CORRECT ANSWER Short between pins other than VCC and ground" "TS relays and switches, sealed component and 2 types - CORRECT ANSWER just replace entire component, faulted mag coils and contacts" "relays and swithces contacts TS, NO NC - CORRECT ANSWER coned or cratered (burned and pitted) burnishing tool, prevents out when E and prevents out when de E." "Electrical TS common faults - CORRECT ANSWER open or short, LED will not illuminate if open or shorted" "Procedure for electrical TS - CORRECT ANSWER is cot op normal? measure Vout observe LEDs Setup okay? check inputs okay Calc/measure check results (repair fault and check again)"