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310T Exam - Electronical and Electrical Systems 113 Questions
With all Correct & Verified Answers.
- 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 - ✔✔✔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 - ✔✔✔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 - ✔✔✔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 - ✔✔✔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 - ✔✔✔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 - ✔✔✔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?
a. Voltage regulator
b. Slip rings
c. Stator
d. Diode trio - ✔✔✔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 - ✔✔✔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 - ✔✔✔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 - ✔✔✔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 - ✔✔✔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 - ✔✔✔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 - ✔✔✔a. A short within the windings
b. A break in the yellow wire in the trailer cord
c. Wrong fuse installed
d. Bad tail light ground - ✔✔✔a. Open ground in the trailer cord
- A voltage drop reading of 0.1 volts on the ground side of a starter circuit could indicate?
a. A properly operating ground cable
b. A open ground cable
c. High resistance inside the ground cable
d. A cable needing a replacement - ✔✔✔a. A properly operating ground cable
- How is the ammeter (DVOM) connected to test for excessive parasitic drain?
a. In series
b. In parallel - ✔✔✔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 - ✔✔✔a. Ground
- What should be applied to the stator and rotor assembly?
a. Grease
b. Solvent
c. Di-electric grease
d. Nothing - ✔✔✔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 - ✔✔✔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 - ✔✔✔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 - ✔✔✔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
- When load testing a battery, what procedure should you follow?
a. Make sure each battery cell is clear
b. Half the rated CCA's for 15 seconds
c. Half the rated CCA'S for 30 seconds
d. Double the rated CCA'S for 15 seconds - ✔✔✔b. Half the rated CCA's for 15 seconds
- What is the average specific gravity of a healthy battery cell?
a. 1.
b. 1.
c. 1.
d. 1.200 - ✔✔✔A. 1.
- What is the final step after repairing an ABS sensor wire?
a. Road test
b. Record service data
c. Clear fault codes
d. Install sensor - ✔✔✔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 - ✔✔✔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 - ✔✔✔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 - ✔✔✔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 - ✔✔✔b. Field coil windings
- If an alternator provides no current output, however provides full current output when the
- Which of the following is used to place a load on the charging system when performing a
current output test?
a. DVOM
b. Spare battery
c. Carbon pile
d. Ammeter - ✔✔✔c. Carbon pile
- At which point during an alternator output test, should the current output reading be taken?
a. When the battery reaches 12v
b. When the battery reaches 9.6v
c. When the battery reaches 12.7v
d. When the battery reaches 13.5v - ✔✔✔C. When the battery reaches 12.7v
- Which of the following would be an acceptable result of an alternator current test on a 200
amp alternator?
a. 150amps
b. 100amps
c. 210amps
d. 190amps - ✔✔✔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 - ✔✔✔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 - ✔✔✔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 - ✔✔✔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 - ✔✔✔a. No current output
b. 1 minute
c. 30 seconds
d. 2 minutes - ✔✔✔d. 2 minutes
- Which of the following statements about a starter solenoid pull-in and hold-in windings is
true?
a. Pull in windings use a heavier gauge wire then hold in windings
b. Hold in windings use a heavier gauge wire then pull in windings
c. Hold-in windings permit higher current flow
d. Pull in windings allow less current flow - ✔✔✔a. Pull in windings use a heavier gauge wire then hold in windings
- What is the function of the overrunning clutch in a starter drive assembly?
a. Prevents damage to the starter through over speeding
b. Overruns until the starter produces enough torque to start the engine
c. Governs starter motor speed
d. Limits engine rpm while cranking - ✔✔✔a. Prevents damage to the starter through over speeding
- Which of the following cranking circuit faults could cause slow cranking?
a. Weak batteries
b. High resistance in the starting circuits
c. High viscosity engine oil
d. All of the above - ✔✔✔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 - ✔✔✔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 - ✔✔✔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 - ✔✔✔c. Current flows to the starter solenoid
- If a heavy duty starter motor appears to spin when energized which of the following could be
c. Starter solenoid
d. Starter relay switch - ✔✔✔d. Starter relay switch
- Which of the following components connects the cranking control circuit with the starter
motor high current circuit?
a. Starter solenoid
b. Starter relay
c. Starter button
d. Ignition switch - ✔✔✔b. starter relay
- What is the typical reference voltage found within a trucks electrical system?
a. Zero V-dc
b. Close to 5V-DC
c. Up to 2.5v-dc
d. Between 12.6v-14.1v - ✔✔✔b. Close to 5V-DC
- What type of output would you measure from a throttle position sensor described as non-
contact?
a. WM (pulse width modulation)
b. DC analogue
c. AC analogue
d. 3-phase ripple - ✔✔✔a. WM (pulse width modulation)
- When you are preparing to boost a set of discharged batteries, where should you locate the
ground wire on the opposing vehicle?
a. Anywhere on the frame
b. Alternator ground clamp
c. Directly on the battery negative post
d. Directly to the battery positive post - ✔✔✔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 - ✔✔✔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 - ✔✔✔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?
