ASE A6 - Electrical / Electronics Practice Test, Exams of Electrical and Electronics Engineering

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ASE A6 - Electrical / Electronics Practice Test

When using a DMM (Digital Multimeter) voltmeter function to check for a voltage drop, meter leads should be connected in which of the following ways? a. On the "positive" side of the circuit b. Across the component or circuit c. To any non-conductive material di In series with che circuit - SORRISGIQANSWER! b. Accoss che component or circuit Voltage is always checked in parallel or across the device or circuit. Which of the following is correct regarding a series circuit? a. Highest resistance has most current b, Lowest resistance has most current c. Lowest resistance has highest voltage drop d. Highest resistance has highest voltage drop - SORREGIPANSWERE d. Highest resistance has highest voltage drop Based on Kirchhoff's Voltage Law: Voltage higher before resistance than after, which is the result of total applied voltage not equal at both ends of a single load circuit. Resistance in circuit opposes electron flow with resulting voltage loss applied to load. The Loss is voltage drop with the voltage lost/consumed as current moves through resistance. HIGHER Resistance, HIGHER DROP. When a Digital Multimeter (DMM) is used to measure DC voltage and is connected in parallel to the load device, which of the following defines the reading? a, Amperage reading Two technicians are discussing a batcery's state of charge. Technician A says a specific gravity of 1.225 at 80F indicates that a battery's state of charge is approximately 75%. Technician B says you can use a hydrometer to check battery state of charge on a maintenance free battery. Who is right? a. A only b. B only c. Both A and B d. Neither A nor B - GORREGHANSWER-:. A only Technician A is correct and Technician B is wrong because maintenance free batteries do not have openings to check the specific gravity of the electrolyte with a hydrometer. When performing a load test on a battery, a technician finds that the battery voltage drops below specifications. Which of the following is the MOST likely action to perform? a, Recharge the battery and return it to service b. Recharge the battery and retest it c. Replace the battery d. Replace the voltage regulator - GORRECIANS WER c. Replace the battery The battery was tested under load and failed. Two technicians are discussing testing a battery using an electronic conductance or continuity tester. Technician A says some of these testers can load test a battery. Technician B says you need to make sure that the ignition switch and all accessories are off. Who is right? a. A only b. B only c. Both A and B d. Neither A nor B - GORREGHANSWER-b. B only Technician A is wrong because this device cannot apply a load. It checks battery conductance. Two technicians are discussing an alternator with zero output. Technician A says the field circuit may have an open circuit. Technician B says the fusible link may be open from the battery to the alternator. Who is right? a. A only b. B only c. Both A and B d. Neither A nor B - CORRECT ANSWER-c. Both A and B Both statements are correct. This question is not like the ones above. It has the word LEAST. For this question, look for the choice that would LEAST LIKELY cause the described situation. Read the entice question carefully before choosing your answer. An alternator has low output and is being full-fielded to determine the cause. Which of the following is the LEAST likely result of full-fielding the alternator? a. High battery voltage level b. Battery gassing c. Low battery voltage level d. High alternator amperage output - CORRECT ANSWER -c. Low battery voltage level a. Headlight connector corroded b, Damaged or broken headlight assembly c. Low alternator ourput d. High resistance in the headlight wiring - GORRECGMANSWERI-c. Low alternator output Low alternator output is the least likely cause. All of the other choices will cause a dim headlight. Technician A says you aim HID (High Intensity Discharge) headlights on a level floor with an unloaded vehicle. Technician B says when aiming any headlights, you must follow the state inspection specifications. Who is right? a. A only b. B only c. Both A and B d. Neither A nor B - CORRECT ANSWER-c. Both A and B Both statements are correct Technician A says an aiming screen will work on any headlight design to aim the headlights. Technician B says mechanical aimers are used on HID (High Intensity Discharge) headlights. Who is right? a. A only b. B only c. Both A and B d. Neither A nor B - CORRECT ANSWER. a. A only Technician A is correct because the aiming screen is the tool of choice due to the many different headlight designs used. Technician B is wrong because mechanical aimers are no longer used and were never used on HID headlights. Which of the following describes the MOST common type of electrical wiring used in instrument lighting? a. Aluminum stranded type b. Copper stranded type c. Twisted pair type d. Solid copper type - GORREGIANSWERL b. Copper stranded type Copper stranded type electrical wiring is the GORRECTANSWER because the other types are not common, What cype of solder is required to repair che instrument panel wiring? a. Acid core b. 60/40 with no flux c. Rosin core d. 50/50 with acid paste flux - CORRECT ANSWER-c. Rosin core Rosin core is the specified type of solder to use on any electrical repair to insure integrity. D. Neither A or B - SQRRIEGINANSSUERI-B- Always disconnect the ne the negative battery cable and wrap with cape so contract cannot be made. Follow the specific vehicle's disarming instructions, as some SRS system can retain back up power for an additional period of time. Always disconnect negative battery terminal - GORRECTIANSIVERI- Which of these should be used when soldering electrical wiring connections? A, Rosin Core Flux B, Acid core Flux C. Sulfur Core Flux D. none of the above. CORRECT ANSWER -A- for best results and less corrosion at the solder point, a rosin core flux should be used. When testing computer controlled systems, a digital multi-meter should be used with an input impedance of at least: A. 10k ohms B, 100k ohms C. | megohm D.10 megohins - (SGRREGIIANSWERI-D- For maximum protection co the computer controlled system of any electronic circuit, it is best co use at least a 10 megohm impedance digital multimeter. When troubleshooting a slow drain on the battery, which of these diagnostic tools should be used? A, Ohmeter B. ammeter C, voltmeter D, Test light - SORREGIAINSWERLB- always use an ammeter of a low amperage amp clamp with your DMM to troubleshoot a slow drain in an electrical circuit> The condition of a lead-acid battery is being checked. Tech A says to use a galvanometer.. Tech B says to use a capacitive battery tester. A. Tech A only B. Tech B only C, Both A and B D. Neither A or B- GORRECIAINSWER!B- A galvanometer is an analog type voltmeter. OEMs almost universally recommend the use of a non intrusive conductive capacitive type battery tester. While testing a starting circuit on a 5.7 V8 engine, the Tech finds that the engine cranks slowly. The starter current draw is 90 amps, and the battery voltage while cranking is 11 voles. What should the Tech Do next? A. Check for voltage drop of the starter motor circuit. B. Test the battery capacity. C. Replace the starter motor, as a short is indicated. D. Determine the condition of the engine. - CORRECT ANSWER -A- if an engine cranks slowly and the starter current draw is only 90 amps and the voltage is as high as 11 volts, the tech should next check for excessive voltage drop in the starter motor circuit. Tech A says that a noisy alternator could be caused by a bad diode. Tech B says chat noisy alternator could be caused by a worn bearing. Who is right? A. Tech A only B. Tech B only C, Both A and B D. Neither A or B- CORRECT ANSWER -C- Both techs are correct, worn alternator bearings and/or a bad alternator diode will cause che alternator to be noisy. B. excessive resistance C. excessive amperage. D. Good ground - CORRECT ANSWER-A- Avoltmeter should first be used to see if the circuit is getting power before doing further tests. When checking the green eye of a sealed maintenance free battery, ne color seen indicates that the battery is: A. undercharged B. charged properly. C. Overcharged. D. Damaged. - CORRECT ANSWER -A- if the so called Green eye is not visible, the green tip of the built in hydrometer is not floating high enough in the electrolyte to be visible. A fully charged battery will cause the builc in hydrometer to float to the top of the electrolyte and allow the green tip of it to be seen. Both headlights on a vehicle are dim on high beam but are normal on low beam. Tech A says that a poor headlight ground could be the cause Tech B says that a shorted headlight switch could be the cause. Who is right? A. Tech A only B. Tech B only C. Both A and B D. neither A or B - SORRECIAINSWERLD- neither tech is right. A poor headlight ground would cause both the high and low beam lights to be dim. A shorted headlight switch would only cause the headlights to operate incorrectly or not at all. The oil pressure light on a vehicle dashboard stays on whenever the engine is running. The oil pressure has been checked with a mechanical gauge and it is within specs. Tech A says that the circuit between the indicator light and the pressure switch could be grounded. Tech B says chat an open in the pressure switch itself could be the cause. Who is right? A. Tech A only B. tech B only C. Both A and B D. Neither A or B - GORREGIANSWERA- since voltage is supplied to the indicator light when the ignition switch is on, the indicator light will normally light when the oil pressure switch supplies a ground to complete the circuit. if a short to ground occurs between the indicator light and the oil pressure switch, the light will be on whenever the ignition switch is in the ON position. An open switch prevent the light from coming on, Nothing happens when the ignition key is turned to the START position in a vehicle with a good battery. Tech A says this if a clicking sound is heard when a jumper wire is connected between the battery and the solenoid "S" terminal, a problem exists in the starter control circuit. Tech B says that if a jumper wire is connected between the battery and the solenoid "S" terminal and there is no sound, the starter is defective. Who is right? A. Tech A only B. Tech B only C. Both A and B D. Neither A or B- CORRECT ANSWER -D- Neither Tech is right. Ifa jumper wire is connected between the battery and the solenoid S terminal and the engine cranks, there is a problem in the starter control circuit. If the solenoid makes a clicking sound, it is operating properly and the problem may be with the starter. If no sound is heard, the solenoid is defective and should be replaced. Avehicle continues to trip the windshield wiper circuit breaker. Tech A says the cause could be a short circuit. Tech B says that the cause could be binding wiper linkage. Who is right? A. Tech A only B. Tech B only C. Both A and B D. Neither A or B- GORREGINANSWERI-C- Both techs are right. A circuit breaker will disconnect the circuit if the circuit has a higher than normal current flow, which can be caused by a short in the circuit of a binding of the wiper linkage. Tech A says chat an in vehicle high rate discharge battery load test should always be performed if a 12 volt battery if its condition is in question. Tech B says that the battery should be discharged (loaded) at twice its ampere hour rating. Who is right? A. Tech A only B. Tech B only C. Both A and B D. Neither A or B- CORRECT ANSWER -D- Neither Tech is right. The high rate discharge (load) test of a battery is frowned upon by OEMs because of the likely hood of overstressing the alternator. If done with the battery removed (or disconnected) from the vehicle, the load applied should be three times the battery's ampere-hour rating or half of its CCA rating all of the following are indications of an undercharged battery condition except: A, Slow cranking B, Dim headlights C. short light bulb life D. Low ammeter indication - CORRECT ANSWER -C- Short light bulb life and a battery that continually needs water are indications of overcharging. A rear defogger grid is being tested. Tech a says that when probing a grid line, the voltmeter should decrease its reading as the probe gets closer to the ground bus bar. Tech B says that if voltmeter read 12 volts at both ends of the grid line, there is an open in the grid line. Who is right? A. Tech A only B. Tech B only C. Both A and B D. Neither A or B- CORRECT ANSWER -A- If the test light remains bright at both ends of the grid lines, check for a loose ground. If there is an open in a grid line, the tesc light will not get dimmer and will stay the same brilliance until it reaches the other side of the open, at which point it will go out. All of the following warning system lights use a grounding switch EXCEPT: A. oil pressure B. coolant temperature C. brake warning D, charging system - CORRECT ANSWER -D- Charging system warning lights are controlled by charging voltage. The light bulb is not grounded at the instcument panel. Instead, current flows through the bulb and eventually grounds at the ground brush inside the alternator, When the alternator is charging, current through a wire to the opposite side of the bulb from the ignition switch. Because both sides of the bulb receive similar voltages, no current flows through the bulb and it doesn’t light. Tech A says that all power should be removed from a circuit before testing the ciccuic with an Ammeter. tech B says that all power should be removed from a circuit before testing the circuit with an chmmeter. Who is right? A. Tech A only B. Tech B only C. Both A and B D. Neither A or B- CORRECT ANSWER -b- When using an ohmmeter, all power should be removed from the circuit to be tested. Power to the circuit is necessary when testing a circuit with an ammeter. Tech A says that checked with an ohmmeter, a diode should have a high resistance in one direction only. Tech B says a diode permits the flow of electricity in both directions. Who is right? A. Tech A only B. Tech B only C. Both A and B D. Neither A or B- CORRECT ANSWER -A- A diode is a semiconductor that permits the flow of electricity in only one direction, When checking a diode with an ohmmeter, put the probes with red on the N- side; black goes on the P -side, Read the resistance, then reverse the leads. The diode should have a high resistance in one direction only. All of the following could cause an inoperative starter EXCEPT: D. voltage - SORRECIANS WERE B- the components of Ohm's Lay include Voltage (E), amperes (I) and ohms (R). Tech A says that the rectifier bridge consisting of six diodes changes DC to AC voltage. Tech B says thac an externally grounded alternator can be full fielded by grounding the field terminal. Who is right? A. Tech A only B, Tech B only C. Both A and B D. Neither A or B- CORRECT ANSWER -B- the rectifier bridge changes AC voltage to DC voltage. To test an externally grounded alternator, make sure all lights and accessories are off. Set the engine RPM to 1500-2000, now ground the field according to the manufacturer's recommended procedure. Full amperage output should be indicated if the alternator is in good condition and being driven properly. Tech A says that voltage in a series circuit should be the same at all loads of the circuit. Tech B says thac current in a series circuit is che sum of all the components current draw in a circuit. Who is right? A. Tech A only B. Tech B only C. Both A and B D. Neither A or B- CORRECT ANSWER -D- Neither tech is right. Total voltage in a series circuit is equal to the sum of the voltages across the separate resistances. Total current in a series circuit is the same throughout the circuit. Another way of saying 75 millivolts is A. 0.075 volts B. 0.75 volts C. 7.5 volts D. 7.05 voles - GORRECHANSWER!A- 75 millivoles= 0.075 volts. The fuse for a power window system is blown. Any of these could be the cause EXCEPT: A. wire is shorted to ground somewhere in the circuit. B, The window track is binding C. an open exists in the motors circuit. D. there is a short in the motor. - SORREGIANSIVER.C- A fuse normally blows because of high current draw. A typical cause for a blown fuse is a short circuit. A short may occur in the wiring or motor itself. Ifa window is binding in its track, the motor will tend to draw an excessive amount of current. this high current draw may cause the circuit to breaker to trip or a fuse to blow, The problem may also cause motor damage. An open circuit will draw zero current and therefore, would not be a cause for the blown fuse. a horn makes a very weak sound. Tech A says a faulty power connection could be the cause. Tech B says a faulty fuse could be the cause. Who is right? A. Tech A only B. Tech B only C, Both A and B D, Neither A or B- GORREGIVANSWER)-A- if horn sound is a weak tone, current is too low, and poor electrical connections may be the culprit. Ifa fuse is blown, the horn will not sound at all. Two lights are connected in parallel. An additional light is added, also wired in parallel. Tech A says the total resistance will decrease. Tech B says the total Voltage will drop. Who is right? A. Tech A only B, tech B C, Both A and B D, Neither A or B- GORREGIVANSWERI.A- adding an additional path through which the current can flow has decreased the total resistance of the circuit. Each light drops 12 volts.