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310T Exam - Electronical and
Electrical Systems questions well
answered
- When trouble shooting an electrical engine or transmission, what else might be require? a. Test lamp b. Break out box c. Continuity tester d. Ohm meter - ANS ✔✔b. break out box
- An electronically equipped vehicle over heats, the engine fan will no engage upon engine ECM request. What is likely the issue? a. Relay contacts burnt b. Open in the relay c. Solenoid open-circuit d. Solenoid seized - ANS ✔✔b. open in the relay
- When performing a test on the stator, there is "zero-ohms" measured between the windings end and the stator frame. What should be done? a. Replace the stator b. Re-solder windings c. Install new brushes d. Increase the voltage - ANS ✔✔a. Replace the stator
- Alternator rings are pitted but can be repaired, what procedure should be done? a. Polish with a crocus cloth b. Smooth with fine sandpaper c. Replace slip rings d. Install new brushes as-is - ANS ✔✔a. polish for a crocus cloth
- What procedure should be followed when repairing multiple wires within a short section of a wiring harness? a. Twist wires together b. Twist and tape connections c. Solder wires in parallel d. Stagger splices, solder and tape - ANS ✔✔d. Stagger splices, solder and tape
- When the brakes are applied, the trailer clearance lights become dim and flicker, what is the likely cause? a. Light switch overload b. High resistance in the tail light assembly c. Short circuit at the trailer connector d. Incorrect supply voltage - ANS ✔✔c. Short circuit at the trailer connector
- Cruise control functions fine during the day time, once the running lights are on, cruise control fails to function. What is the likely cause?
b. Slip rings c. Stator d. Diode trio - ANS ✔✔d. diode trio
- Upon disassembly, a no-operating starter has loose solder particles escaping. What is likely the cause? a. Over-speed b. Low battery voltage c. Defective solenoid d. Excessive voltage - ANS ✔✔b. low battery voltage
- A starter solenoid provides a chattering sounds while activated, what is this likely a cause of? a. Open circuit within the starter b. Defective solenoid c. Open circuit within the hold in windings d. Low battery voltage - ANS ✔✔d. Low battery voltage
- What is the correct procedure when testing for cranking amperage using an inductive pick up? a. Place the inductive pick-up around the starter cable, while cranking b. Place the inductive pick up around the ground cable, wile cranking c. Load test the battery for 15 seconds d. Perform a battery load test - ANS ✔✔a. Place the inductive pick-up around the starter cable, while cranking
- The primary purpose of using a relay is to?
a. Allow a low voltage circuit to control a high voltage circuit b. Allow a low amperage circuit to control a high amperage circuit c. To reduce the amount of diodes within the circuit d. To increase the amount of resistance in a circuit - ANS ✔✔b. Allow a low amperage circuit to control a high amperage circuit
- A vehicles check engine light illuminates each trip, although disappears every time the key is turned off. How could you properly diagnose this engine? a. Perform a road test b. Check charging system out put c. Using a scan tool, or a PC check for historic fault codes d. Check all fuses or circuit breakers - ANS ✔✔c. Using a scan tool, or a PC check for historic fault codes
- When testing the stator of an alternator, a reading of zero ohms would indicate what? a. A short within the windings b. An open within the windings c. A good circuit d. A failed voltage regulator - ANS ✔✔a. A short within the windings
- The purpose of a diode within an electrical circuit is? a. To regulate the voltage b. To provide good ground connections c. Provide a one way path d. To increase amperage - ANS ✔✔C. Provide a one way path
d. A cable needing a replacement - ANS ✔✔a. A properly operating ground cable
- How is the ammeter (DVOM) connected to test for excessive parasitic drain? a. In series b. In parallel - ANS ✔✔a. In series
- What connection do you remove first before load testing a battery bank? a. Ground b. Positive c. All cables at once d. None - ANS ✔✔a. Ground
- What should be applied to the stator and rotor assembly? a. Grease b. Solvent c. Di-electric grease d. Nothing - ANS ✔✔d. Nothing
- What would cause a starter to be moving in and out when engaged? a. Pull in windings are open b. Shift fork is bent c. Hold in windings are open d. Overrunning Clutch is seized - ANS ✔✔c. Hold in windings are open
- What is the proper procedure to repair a battery cable?
a. Cut, strip, crimp b. Cut, strip, crimp, solder c. Cut, crimp, shrink d. Cut, butt connector, post - ANS ✔✔b. Cut, strip, crimp, solder
- What is the proper way to test a wheel speed sensor? a. DMM for voltage as you spin the wheel b. DMM for resistance as you spin the wheel c. Diode test d. Voltage drop test - ANS ✔✔a. DMM for voltage as you spin the wheel
- How do you properly repair a CAN-Line? a. cut, strip, solder, tape b. Cut, strip, stagger splices, mimic twist rate, heat shrink c. Cut, strip, butt connector d. Cut, strip, solder, wrap - ANS ✔✔b. Cut, strip, stagger splices, mimic twist rate, heat shrink Terminals of the 9 pin Deutsch connector shows infinite resistance on the j1939 circuit. What is the likely reason? a. Nothing, this is normal b. An open in the circuit c. A Short in the circuit d. J1708 data bus present - ANS ✔✔no answer in book
- A fuel gauge is constantly showing full, even after you have driven a reasonable amount, what
a. Road test b. Record service data c. Clear fault codes d. Install sensor - ANS ✔✔b. Record service data
- Paint located between the battery ground terminal and frame on a truck would likely cause? a. High resistance on the ground side of the starter circuit b. It would not effect anything c. The truck would rollover but not start d. High resistance in the positive side of the starter circuit - ANS ✔✔a. High resistance on the ground side of the starter circuit
- A diode that shows a reading of O.L in both directions when measured with a DVOM would indicate what about that diode? a. There is a short in the diode b. There is an open in the diode c. This is the proper function of a diode d. The DVOM is faulty - ANS ✔✔b. There is an open in the diode
- A truck charges 14.5 volts at idle with no electrical loads on but once the lights and heater fans are turned on high the voltage drops to 12.8 volts. Which of the following could be the cause? a. Open in the field winding b. Regulator full fielding c. Brush wire is burnt open
d. Alternator belt is slipping - ANS ✔✔d. Alternator belt is slipping
- The voltage regulator controls current in which of the following components? a. Diode trio b. Field coil windings c. Rectifier bridge d. Brushes - ANS ✔✔b. Field coil windings
- If an alternator provides no current output, however provides full current output when the alternator is full fielded. What would be the most likely cause? a. Faulty bushes b. Bad diode trio c. Failed voltage regulator d. Failed rotor - ANS ✔✔c. Failed voltage regulator
- What causes an alternator to start producing current if the alternator only has an output wire? a. Delta windings b. Wye windings c. Residual magnetism d. Force from the motor - ANS ✔✔c. Residual magnetism
- A rotor can be bench tested for which of the following? a. Current output b. Shorted field coil
amp alternator? a. 150amps b. 100amps c. 210amps d. 190amps - ANS ✔✔d. 190amps
- When checking the rectifier bridge in an alternator, what should the meter be set to? a. Ammeter b. Ohmmeter c. Voltmeter d. Diode check - ANS ✔✔d. Diode check
- When testing alternator output. why should the amp-clamp be at least 6 inches away from the alternator? a. So that the meter wont over heat b. So that there is no interference between magnetic fields c. No reason just practiced that way d. Clamp is not big enough to go directly on the alternator - ANS ✔✔b. So that there is no interference between magnetic fields
- What is the recommended tool used to check a voltage regulator? a. Ohmmeter b. Voltmeter c. Test light d. Ammeter - ANS ✔✔d. ammeter
- If an alternator has an open in the field coil, what would be the likely result? a. No current output b. High current output c. ½ the current output d. Low current output - ANS ✔✔a. No current output
- What type of stator winding would have only one wire going to each of the three eyelets that bolts to the rectifier bridge? a. Wye b. Delta c. S -type d. R-type - ANS ✔✔a. Wye
- When performing a battery load test, the battery voltage should remain above? a. 9.0v b. 12.4v c. 12.2v d. 9.6v - ANS ✔✔d. 9.6V
- To perform a battery load test: Verify that the battery is at, at least? a. 12.9v b. 12.4v c. 9.6v d. 9.0v - ANS ✔✔b. 12.4v
c. High viscosity engine oil d. All of the above - ANS ✔✔d. all of the above
- A cranking current test on a diesel engine indicates low current draw. Which of the following faults would NOT be responsible for low current draw? a. High resistance in the starter circuit b. Partially discharged batteries c. Seized pistons d. High resistance in the ground circuit - ANS ✔✔c. Seized pistons
- What should be regarded as the maximum cranking time before resting a starter motor and allowing it to cool? a. 15 seconds b. 30 seconds c. 1 minute d. 45 seconds - ANS ✔✔b. 30 seconds
- When the ignition switch is closed, which of the following should happen first? a. The pull in windings energize b. Cranking current flow goes through the control circuit c. Current flows to the starter solenoid d. The engine shuts down - ANS ✔✔c. Current flows to the starter solenoid
- If a heavy duty starter motor appears to spin when energized which of the following could be
at fault? a. A defective drive pinion b. A stripped flywheel c. A defective starter motor d. All of the above - ANS ✔✔d. all of the above
- When the cranking circuit is energized in sub-zero conditions, the engine turns over slowly and unevenly. Which of the following would be the most likely cause? a. Gelled engine oil b. Frozen circuit c. High coolant temperatures d. Stripped flywheel gear - ANS ✔✔a. Gelled engine oil
- When used, where is a starter safety switch likely to be located? a. Standard transmission b. Automatic transmission c. Either a standard or automatic transmission d. Ignition key - ANS ✔✔c. Either a standard or automatic transmission
- If you are bypassing a starter relay switch using a jumper wire, what component is being tested? a. Battery bank b. Ignition key c. Starter solenoid d. Starter relay switch - ANS ✔✔d. Starter relay switch
b. Alternator ground clamp c. Directly on the battery negative post d. Directly to the battery positive post - ANS ✔✔c. directly on the battery negative post
- A driver complains of radio static and is having a no start condition, they claim the batteries are brand new, which should you check first? a. Alternator AC leakage b. Alternator amperage output c. Cranking motor ground integrity d. Battery warranty - ANS ✔✔a. Alternator AC leakage
- You are measuring resistance through an NTC thermistor type temperature sensor, 75 kohms is displayed, what should be done? a. Discard the sensor and get a new one b. Nothing, 50-100kohms is normal for this style of sensor c. Heat the thermistor to test d. Cool the thermistor to test - ANS ✔✔b. Nothing, 50-100kohms is normal for this style of sensor
- In order to access any ECM faults on a data bus, what should be accessed first? a. ID (Message identifier) b. ID (subsystem identifier) c. ID (parameter identifier) d. MI 9fault mode indicator) - ANS ✔✔a. ID (message identifier)
- When trouble shooting for sluggish cranking, you observe a hot battery terminal, what should be done next? a. Test for high resistance at the starter motor positive terminal b. whatVoltage drop across the battery cable clamp and post c. Remove starter motor and check for high resistance in hold off windings d. Voltage drop across the insulated battery to starter cable. - ANS ✔✔b. whatVoltage drop across the battery cable clamp and post
- What is the primary function of an addition gel-cell battery in the truck chassis battery bank? a. Boost available cranking power b. Powers a 24v side of a 12/24 system c. Auxiliary power source when the engine is not running d. Stabilizes alternator output - ANS ✔✔c. Auxiliary power source when the engine is not running
- If you suspect a lead acid battery has frozen, what should you do next? a. Replace the battery b. Charge at high amperage c. Heat with a propane torch d. Trickle charge and observe response - ANS ✔✔d. Trickle charge and observe response
- When an alternator is full -fielded, which of the following temporarily ceases to function? a. Rectifier b. Voltage regulator
