Auto 170 Final

Bench testing of a starter should be done when? 1) After reassembling an old starter 2) Before installing a new starter 3) After removing the old starter 4) Both a and b

4) Both a and b

When load testing a battery, which battery rating is usually used to determine how much load to apply to the battery? 1) CA 2) RC 3) MCA 4) CCA

4) CCA

All OBD II vehicles use what type of read-only memory? 1) ROM 2) PROM 3) EPROM 4) EEPROM

4) EEPROM

Another name for a ground is ________. A) Logic low B) Zero C) Reference low D) All of the above

D) All of the above

A fully charged 12‑volt battery should indicate ________. 1) 12.6 volts or higher 2) A specific gravity of 1.265 or higher 3) 12 volts 4) Both a and b

4) Both a and b

An acceptable charging circuit voltage on a 12 volt system is ________. 1) 13.5 to 15.0 volts 2) 12.6 to 15.6 volts 3) 12 to 14 volts 4) 14.9 to 16.1 volts

1) 13.5 to 15.0 volts

A starter motor rotates about _________ times faster than the engine. 1) 18 2) 10 3) 5 4) 2

1) 18

Normal battery drain (parasitic drain) with a vehicle with many computer and electronic circuits is ________. 1) 20 to 30 milliamperes 2) 2 to 3 amperes 3) 150 to 300 milliamperes 4) None of the above

1) 20 to 30 milliamperes

UART uses a _____ signal that toggles OV. 1) 5 V 2) 7 V 3) 8 V 4) 12 V

1) 5 V

A high-speed CAN BUS communicates with a scan tool through which terminal(s)? 1) 6 and 14 2) 2 3) 7 and 15 4) 4 and 16

1) 6 and 14

Many vehicle manufacturers recommend that a special electrical connector be installed between the battery and the battery cable when testing for ________. 1) Battery drain (parasitic drain) 2)Specific gravity 3)Battery voltage 4) Battery charge rate

1) Battery drain (parasitic drain)

Which battery rating is tested at 0°F (-18°C)? 1) Cold-cranking amperes (CCA) 2) Cranking amperes (CA) 3) Reserve capacity 4) Battery voltage test

1) Cold-cranking amperes (CCA)

o check the charging voltage, connect a digital multimeter (DMM) to the positive (+) and the negative (-) terminals of the battery and select ________________. 1) DC volts 2) AC volts 3) DC amps 4) AC amps

1) DC volts

The brushes are used to transfer electrical power between ______________. 1) Field coils and the armature 2) The commutator segments 3) The solenoid and the field coils 4) The armature and the solenoid

1) Field coils and the armature

What makes a battery "low maintenance" or "maintenance free"? 1) Material is used to construct the grids. 2) The plates are constructed of different metals. 3) The electrolyte is hydrochloric acid solution. 4) The battery plates are smaller, making more room for additional electrolytes.

1) Material is used to construct the grids.

The SAE term for the vehicle computer is ____________. 1) PCM 2) ECM 3) ECA 4) Controller

1) PCM

he alternator output current is produced in the ___________. 1) Stator 2) Rotor 3) Brushes 4) Diodes (rectifier bridge)

1) Stator

A battery high‑rate discharge (load capacity) test is being performed on a 12‑volt battery. Technician A says that a good battery should have a voltage reading of higher than 9.6 volts while under load at the end of the 15-second test. Technician B says that the battery should be discharged (loaded) to twice its CCA rating. Which technician is correct? 1) Technician A only 2) Technician B only 3) Both Technicians A and B 4) Neither Technician A nor B

1) Technician A only

A technician connects one lead of a digital voltmeter to the positive (+) terminal of the battery and the other meter lead to the battery terminal (B) of the starter solenoid and then cranks the engine. During cranking, the voltmeter displays a reading of 878 mV. Technician A says that this reading indicates that the positive battery cable has too high resistance. Technician B says that this reading indicates that the starter is defective. Which technician is correct? 1) Technician A only 2) Technician B only 3) Both Technicians A and B 4) Neither Technician A nor B

1) Technician A only

What gases are released from a battery when it is being charged? 1) Oxygen 2) Hydrogen 3) Nitrogen and oxygen 4) Hydrogen and oxygen

4) Hydrogen and oxygen

Technician A says that distilled or clean drinking water should be added to a battery when the electrolyte level is low. Technician B says that fresh electrolyte (solution of acid and water) should be added. Which technician is correct? 1) Technician A only 2) Technician B only 3) Both Technicians A and B 4) Neither Technician A nor B

1) Technician A only

echnician A says that a voltage drop test of the charging circuit should only be performed when current is flowing through the circuit. Technician B says to connect the leads of a voltmeter to the positive and negative terminals of the battery to measure the voltage drop of the charging system. Which technician is correct? 1) Technician A only 2) Technician B only 3) Both Technicians A and B 4) Neither Technician A nor B

1) Technician A only

If the clearance between the starter pinion and the engine flywheel is too great, ________. 1) The starter will produce a high‑pitched whine during cranking 2) The starter will produce a high‑pitched whine after the engine starts 3) The starter drive will not rotate at all 4) The solenoid will not engage the starter drive unit

1) The starter will produce a high‑pitched whine during cranking

All batteries should be in a secure bracket that is bolted to the vehicle to prevent physical damage to the battery. 1) True 2) False

1) True

What unit of electricity is used as a signal for a computer? 1) Volt 2) Ohm 3) Ampere 4) Watt

1) Volt

Terminal 16 of the OBD-II data link connector is used for what? 1) Chassis ground 2) 12 V positive 3) Module (signal ground) 4) Manufacturer's discretion

2) 12 V positive

Which terminal of the data link connector does General Motors use for Class 2 communication? 1) 1 2) 2 3) 3 4) 4

2) 2

To check for ripple voltage from the alternator, connect a digital multimeter (DMM) and select ____________. 1) DC volts 2) AC volts 3) DC amps 4) AC amps

2) AC volts

A growler is used to test what starter component? 1) Field coils 2) Armatures 3) Commutator 4) Solenoid

2) Armatures

Computer speed is measured in ________________. 1) Baud rate 2) Clock speed (Hz) 3) Voltage 4) Bytes

2) Clock speed (Hz)

What battery rating is tested at 32°F (0°C)? 1) Cold-cranking amperes (CCA) 2) Cranking amperes (CA) 3) Reserve capacity 4) Battery voltage test

2) Cranking amperes (CA)

When testing an alternator rotor, if an ohmmeter shows zero ohms with one meter lead attached to the slip rings and the other meter lead touching the rotor shaft, the rotor is ________. 1) Okay (normal) 2) Defective (shorted-to-grounded) 3) Defective (shorted-to-voltage) 4) Okay (rotor windings are open)

2) Defective (shorted-to-grounded)

The four basic computer functions include __________________. 1) Writing, processing, printing, and remembering 2) Input, processing, storage, and output 3) Data gathering, processing, output, and evaluation 4) Sensing, calculating, actuating, and processing

2) Input, processing, storage, and output

A module is also known as a _________. 1) BUS 2) Node 3) Terminator 4) Resistor pack

2) Node

When a battery becomes completely discharged, both positive and negative plates become _______ and the electrolyte becomes _____________. 1) H2SO4 / Pb 2) PbSO4 / H2O 3) PbO2 / H2SO4 4) PbSO4 / H2SO4

2) PbSO4 / H2O

Series‑wound electric motors _______. 1) Produce electrical power 2) Produce maximum power at 0 RPM 3) Produce maximum power at high RPM 4) Use a shunt coil

2) Produce maximum power at 0 RPM

A charge indicator (eye) operates by showing green or red when the battery is charged and dark if the battery is discharged. This charge indicator detects ________________. 1) Battery voltage 2) Specific gravity 3) Electrolyte water pH 4) Internal resistance of the cells

2) Specific gravity

perating an alternator in a vehicle with a defective battery can harm the _______. 1) Diodes (rectifier bridge) 2) Stator 3) Voltage regulator 4) Brushes

2) Stator

A V-6 is being checked for starter amperage draw. The initial surge current was about 210 amperes and about 160 amperes during cranking. Technician A says the starter is defective and should be replaced because the current flow exceeds 200 amperes. Technician B says this is normal current draw for a starter motor on a V-6 engine. Which technician is correct? 1) Technician A only 2) Technician B only 3) Both Technicians A and B 4) Neither Technician A nor B

2) Technician B only

Technician A says that a defective solenoid can cause a starter whine. Technician B says that a defective starter drive can cause a starter whining noise. Which technician is correct? 1) Technician A only 2) Technician B only 3) Both Technicians A and B 4) Neither Technician A nor B

2) Technician B only

Technician A says that a wye-wound stator produces more maximum output than the same alternator equipped with a delta-wound stator. Technician B says that an alternator equipped with a delta-wound stator produces more maximum output than a wye-wound stator. Which technician is correct? 1) Technician A only 2) Technician B only 3) Both Technicians A and B 4) Neither Technician A nor B

2) Technician B only

Technician A says that the diodes regulate the alternator output voltage. Technician B says that the field current can be computer controlled. Which technician is correct? 1) Technician A only 2) Technician B only 3) Both Technicians A and B 4) Neither Technician A nor B

2) Technician B only

A battery date code sticker indicates D6. What does this mean? 1) The date it was shipped from the factory was December, 2006. 2) The date it was shipped from the factory was April, 2006. 3) The battery epires in December, 2002. 4) It was built the second day of the week (Tuesday).

2) The date it was shipped from the factory was April, 2006.

When jump starting, ________. 1) The last connection should be the positive post of the dead battery 2) The last connection should be the engine block of the dead vehicle 3) The alternator must be disconnected on both vehicles 4) Both a and c are correct

2) The last connection should be the engine block of the dead vehicle

What unit contains a hold-in winding and a pull-in winding? 1) The field coil 2) The starter solenoid 3) The armature 4) The ignition switch

2) The starter solenoid

What two things can a vehicle computer actually perform (output)? 1) Store and process information 2) Turn something on or turn something off 3) Calculate and vary temperature 4) Control fuel and timing only

2) Turn something on or turn something off

When measuring the specific gravity of the electrolyte, the maximum allowable difference between the highest and lowest hydrometer reading is ________. 1) 0.010 2) 0.020 3) 0.050 4) 0.50

3) 0.050

Analog signals from sensors are changed to digital signals for processing by the computer through which type of circuit? 1) Digital 2) Analog 3) Analog-to-digital converter 4) PROM

3) Analog-to-digital converter

The neutral safety switch is located ________________. 1) Between the starter solenoid and the starter motor 2) Inside the ignition switch itself 3) Between the ignition switch and the starter solenoid 4) In the battery cable between the battery and the starter solenoid

3) Between the ignition switch and the starter solenoid

A vehicle equipped with a V-8 engine does not crank fast enough to start. Technician A says the battery could be discharged or defective. Technician B says that the negative cable could be loose at the battery. Which technician is correct? 1) Technician A only 2) Technician B only 3) Both Technicians A and B 4) Neither Technician A nor B

3) Both Technicians A and B

Technician A says that a discharged battery (lower than normal battery voltage) can cause solenoid clicking. Technician B says that a discharged battery or dirty (corroded) battery cables can cause solenoid clicking. Which technician is correct? 1) Technician A only 2) Technician B only 3) Both Technicians A and B 4) Neither Technician A nor B

3) Both Technicians A and B

Technician A says that an alternator overrunning pulley is used to reduce vibration and noise. Technician B says that an overrunning alternator pulley or dampener uses a one-way clutch. Which technician is correct? 1) Technician A only 2) Technician B only 3) Both Technicians A and B 4) Neither Technician A nor B

3) Both Technicians A and B

Technician A says that module communications networks are used to reduce the number of wires in a vehicle. Technician B says that a communications network is used to share data from sensors, which can be used by many different modules. Which technician is correct? 1) Technician A only 2) Technician B only 3) Both Technicians A and B 4) Neither Technician A nor B

3) Both Technicians A and B

Technician A says that the computer can be used to control the output of the alternator by controlling the field current. Technician B says that voltage regulators control the alternator output by controlling the field current through the rotor. Which technician is correct? 1) Technician A only 2) Technician B only 3) Both Technicians A and B 4) Neither Technician A nor B

3) Both Technicians A and B

Technician A says that two diodes are required for each stator winding lead. Technician B says that diodes change alternating current into direct current. Which technician is correct? 1) Technician A only 2) Technician B only 3) Both Technicians A and B 4) Neither Technician A nor B

3) Both Technicians A and B

Two technicians are discussing what could be the cause of slow cranking and excessive current draw. Technician A says that an engine mechanical fault could be the cause. Technician B says that the starter motor could be binding or defective. Which technician is correct? 1) Technician A only 2) Technician B only 3) Both Technicians A and B 4) Neither Technician A nor B

3) Both Technicians A and B

The "brain" of the computer is the ______________. 1) PROM 2) RAM 3) CPU 4) AD converter

3) CPU

Alternator brushes are constructed from _________________. 1) Copper 2) Aluminum 3) Carbon 4) Silver-copper alloy

3) Carbon

Permanent magnets are commonly used for what part of the starter? 1) Armature 2) Solenoid 3) Field coils 4) Commutator

3) Field coils

GMLAN is the General Motors term for which type of module communication? 1) UART 2) Class 2 3) High-speed CAN 4) Keyword 2000

3) High-speed CAN

Which battery rating is expressed in minutes? 1) Cold-cranking amperes (CCA) 2) Cranking amperes (CA) 3) Reserve capacity 4) Battery voltage test

3) Reserve capacity

A magnetic field is created in the ___________ in an alternator. 1) Stator 2) Diodes 3) Rotor 4) Drive‑end frame

3) Rotor

Deep cycling means ________. 1) Overcharging the battery 2) Overfilling or underfilling the battery with water 3) The battery is fully discharged and then recharged 4) The battery is overfilled with acid (H2SO4)

3) The battery is fully discharged and then recharged

The faster a starter motor rotates ____________________. 1) The more current it draws from the battery 2) The less CEMF is generated 3) The less current it draws from the battery 4) The greater the amount of torque produced

3) The less current it draws from the battery

Why should the lights be turned on when checking for ripple voltage or AC current from the alternator? 1) To warm the battery 2) To check that the battery is fully charged 3) To create an electrical load for the alternator 4) To test the battery before conducting other tests

3) To create an electrical load for the alternator

GM Class 2 communication toggles between _____ . 1) 5 and 7 V 2) 0 and 12 V 3) 7 and 12 V 4) 0 and 7 V

4) 0 and 7 V

An alternator diode is being tested using a digital multimeter set to the diode check position. A good diode will read _______ if the leads are connected one way across the diode and ______ if the leads are reversed. 1) 300 / 300 2) 0.475 / 0.475 3) OL / OL 4) 0.551 / OL

4) 0.551 / OL

The maximum allowable AC current in amperes that is being sent to the battery from the alternator is _________. 1) 0.4 A 2) 1 to 3 A 3) 3 to 4 A 4) 10% of the rated output of the alternator

4) 10% of the rated output of the alternator

How much current flows through the alternator brushes? 1) All of the alternator output flows through the brushes 2) 25 A to 35 A, depending on the vehicle 3) 10 A to 15 A 4) 2 A to 5 A

4) 2 A to 5 A

Normal cranking speed of the engine is about ___________. 1) 2,000 RPM 2) 1,500 RPM 3) 1,000 RPM 4) 200 RPM

4) 200 RPM

Which terminal of the OBD-II data link connector is the signal ground for all vehicles? 1) 1 2) 3 3) 4 4) 5

4) 5

The positive battery plate is ____________. 1) Lead dioxide 2) Brown in color 3) Sometimes called lead peroxide 4) All of the above

4) All of the above

The voltage regulator controls the current through ________. 1) The alternator brushes 2) The rotor 3) The alternator field 4) All of the above

4) All of the above

Which item is a computer input sensor? 1) RPM 2) Throttle position 3) Engine coolant temperature 4) All of the above

4) All of the above

Which item is a computer output device? 1) Fuel injector 2) Transmission shift solenoid 3) Evaporative emission control solenoid 4) All of the above

4) All of the above

CAN H and CAN L operate how? 1) CAN H is at 2.5 volts when not transmitting 2) CAN L is at 2.5 volts when not transmitting 3) CAN H goes to 3.5 volts when transmitting 4) All of the above are correct

4) All of the above are correct

When charging a maintenance free (lead calcium) battery, ________. 1) The initial charging rate should be about 35 amperes for 30 minutes 2) The battery may not accept a charge for several hours, yet may still be a good (serviceable) battery 3) The battery temperature should not exceed 125°F (hot to the touch) 4) All of the above are correct

4) All of the above are correct

An alternator could test as producing lower-than-normal output, yet be okay, if ________. 1) The battery is weak or defective 2) The engine speed is not high enough during testing 3) The drive belt is loose or slipping 4) All of the above occur

4) All of the above occur

Slow cranking by the starter can be caused by all except the following: ________. 1) A low or discharged battery 2) Corroded or dirty battery cables 3) Engine mechanical problems 4) An open neutral safety switch

4) An open neutral safety switch

What component or circuit can keep the engine from cranking? 1) Anti-theft 2) Solenoid 3) Ignition switch 4) Any of the above

4) Any of the above

Starter motors operate on the principle that ________. 1) The field coils rotate in the opposite direction from the armature 2) Opposite magnetic poles repel 3) Like magnetic poles repel 4) The armature rotates from a strong magnetic field toward a weaker magnetic field

4) The armature rotates from a strong magnetic field toward a weaker magnetic field

A diode installed across a coil with the cathode toward the battery positive is called ________. A) A clamping diode B) A forward biased diode C) An SCR D) A transistor

A) A clamping diode

Coil polarity is determined by the ______. A) Direction of rotation of the coil windings B) Turn ratio C) Direction of laminations D) Saturation direction

A) Direction of rotation of the coil windings

A zener diode is normally used for voltage regulation. A zener diode, however, can also be used for high-voltage spike protection if connected ________. A) Positive to anode, negative to cathode B) Positive to cathode, ground to anode C) Negative to anode, cathode to a resistor then to a lower-voltage terminal D) Both a and c

B) Positive to cathode, ground to anode

The pulse generator ______. A) Fires the spark plug directly B) Signals the electronic control unit (module) C) Signals the computer that fires the spark plug directly D) Is used as a tachometer reference signal by the computer and has no other functions

B) Signals the electronic control unit (module)

The forward-bias voltage required for an LED is ________. A) 0.3 to 0.5 volt B) 0.5 to 0.7 volt C) 1.5 to 2.2 volts D) 4.5 to 5.1 volts

C) 1.5 to 2.2 volts

Technician A says that a defective crankshaft position sensor can cause a no-spark condition. Technician B says that a faulty ignition control module can cause a no-spark condition. Which technician is correct? A) Technician A only B) Technician B only C) Both Technicians A and B D) Neither Technician A nor B

C) Both Technicians A and B

Ignition coil primary resistance is usually _____ ohms. A) 6,000 to 30,000 B) 150 to 1,500 C) Less than 3 D) Zero

C) Less than 3

The Primary (low voltage) ignition system must be working correctly before any spark occurs from a coil. Which component is NOT in the primary ignition circuit? A) Ignition Module (Igniter) B) Ignition switch C) Spark plug wiring D) Pickup coil (pulse alternator)

C) Spark plug wiring

A transistor is controlled by the polarity and current at ________. A) The collector B) The emitter C) The base D) Both a and b

C) The base

A compression-sensing ignition system uses a ______ type of ignition. A) Distributor B) Coil on plug C) Waste spark D) All of the above

C) Waste spark

A semiconductor is a material ________. A) With fewer than four electrons in the outer orbit of its atoms B) With more than four electrons in the outer orbit of its atoms C) With eactly four electrons in the outer orbit of its atoms D) Determined by other factors besides the number of electrons

C) With eactly four electrons in the outer orbit of its atoms

A waste-spark-type ignition system fires ______. A) Two spark plugs at the same time B) One spark plug with reverse polarity C) One spark plug with straight polarity D) All of the above

D) All of the above

The ignition module has direct control over the firing if the coil(s) of an ignition system. Which component(s) triggers(controls) the module? A) Pickup coil B) Computer C) Crankshaft Sensor D) All of the above

D) All of the above

An LED can be used in _____________________. A) A headlight B) A taillight C) A brake light D) Any of the above

D) Any of the above

Clamping diodes ________. A) Are connected into a circuit with the positive (+) voltage source to the cathode and the negative (‑) voltage to the anode B) Are also called despiking diodes C) Can suppress transient voltages D) Are all of the above

D) Are all of the above

The arrow in a symbol for a semiconductor device ________. A) Points toward the negative B) Points away from the negative C) Is attached to the emitter on a transistor D) Both a and c are correct

D) Both a and c are correct

A transistor can ________. A) Switch on and off B) Amplify C) Throttle D) Do all of the above

D) Do all of the above

Distributor ignition systems can be triggered by a _________. A) Hall-effect sensor B) Magnetic Pickup C) Spark sensor D) Either A or B

D) Either A or B