Hybrid exam
During a battery load test performed at room temperature, the voltage should not fall below..
9.6 volts after 15 seconds
you are testing a starter motor armature. if a reading of zero ohms is obtained when one test lead is placed on the armature shaft and the other is placed on the commutator bars, the armature is:
grounded
what does secondary air (AIR) do?
help oxidize HC and CO in exhaust system
A solenoid shift starter may chatter when engaged if :
hold in winding is open (Low battery charge)
in Di equipped vehicle utilizing electronic ignition, the component located in the double circle that switches current to ground would have been replaced by an:
ignition control module
Booster batteries should be connected:
in parallel
the primary current switching device used in an electronic ignition control module is a:
switching transistor
if the rubber boot in between the air flow sensor plate and the throttle body developed a large crack: (excluding O2 sensor compensation)
the air fuel mixture would become leaner and the engine may stall
how can the voltage of a battery be measure?
the available voltage at the battery can be measured with a voltmeter
a 12 volt battery (that just failed the capacity test) is being charged at 40 amps. After 3 minutes of fast charge, with the charger still operating, a voltmeter hooked across the battery reads 16 volts. what is indicated?
the battery is sulphated and should be replaced
testing a storage battery using a hydrometer will indicate:
the battery state of charge
what valve is used to switch injected air up or down stream of the oxygen sensor:
the diverter valve (AIRD)
what component is used to monitor catalytic converter efficiency?
the downstream HO2 sensor
what items are checked by the comprehensive component monitor?
sensors and actuators that have an effect on emissions
diesel fuel injectors are:
sequentially operated
During hydrometer testing of a battery, the maximum variance between cells should not exceed:
.050
When measuring voltage drops, while cranking an engine, voltmeter '1' should read a maximum of:
0.5 volts
ina typical EI (distributorless ignition system), described as waste park, which of the following should be true?
1 coil for every 2 spark plugs
A voltage check between the alternator output terminal and its case shows the alternator is charging at 14.5 volts. But a voltage check across the battery terminals only shows 13.3 volts. what test should be performed next?
1) voltage drop on the alternator insulated circuit 2) voltage drop on the alternator ground circuit
Which of the following purposes does an automotive battery have?
1. it provides voltage and serves as a source for current flow 2. it serves as a voltage stabilizer 3. it supplies the power needed if the vehicles charging system fails
a specific gravity reading of 1.155 was indicated on a hydrometer. electrolyte temperature was +45F (4.5 C). the temperature compensated reading is:
1.139
Which of the following hydrometer readings indicates a fully charged battery, electrolyte at normal room temperature?
1.265>better
Which of the following open circuit voltages indicates a fully charged battery?
12.6 volts
an acceptable charging circuit voltage on 12 volt system is:
13.5 to 15 volts
You are about to perform a battery capacity test. The battery is marked with the following information: Cold cranking amps= 330 Reverse capacity= 100 minutes What load should you apply?
165 amps
what is the approximate maximum voltage encountered in the primary winding of an ignition coil?
200V
NOx is formed when combustion pressures are high an temperatures reach:
2500 F (1370 C)
Modern ignition systems are capable of generating up to:
40,000V
to measure maximum alternator output, current must be measured through meter: (image 2 yellow sticker)
A
which regulator set up is shown at right? (image 1)
A circuit
With everything turned off and the ammeter connected as shown below, the meter reads 340 mA for about 15 seconds then drops to a continuous reading of 182 mA. This reading is an indication of:
A normal parasitic draw
Which of the products should be used to neutralize corrosion caused by battery acid as used in lead acid batteries
Baking soda
starter brushes are held under spring tension against the:
Commutator
a zirconia type oxygen sensor is a:
DC voltage generating type sensor
where does an OBDII scan tool get its power and ground?
DCL pins 16 power 14 ground
what is the length of time to ignition module allows current to flow through the ignition coil primary winding known as:
Dwell
a catalytic converter's oxidizing bed converts:
HC and CO into H20 and CO2
In a fully charge lead acid battery, the positive plate is made of
Lead peroxide (dioxide)
What would be the proper action if a battery showed the following specific gravity results: cell 1 cell 2 cell 3 cell 4 cell 5 cell 6 1.200 1.210 1.190 1.200 1.205 1.200
Recharge the battery
In a fully charged lead acid battery, the negative plate is made of?
Sponge lead
voltmeter leads are connected as in meter "2", while the key is turned to the crank position. \the voltmeter reads 1.8 volts. This indicates that:
The terminal requires cleaning
The capacity of lead acid battery is determined by
The total plate area exposed to the electrolyte, as well as the strength and temperature of the electrolyte
carbon monoxide is:
a colourless, odourless, poisonous gas
which engine runs leaner air fuel ratio at hot idle?
a mechanical diesel fuel injection system
by what means does a vane airflow sensor measure air entering the engine
a potentiometer to signal airflow
The magnetic field in the alternator is:
a rotating electromagnet
a fuel pressure regulator incorporates:
a spring loaded diaphragm and valve assembly
when adjusting ignition timing, to advance the timing, turn the distributor housing:
against the direction of distributor shaft rotation
to correctly measure any unwanted voltage drop along B+ side of the charging circuit, a technician must full field the alternator, engine at fast idle, and connect the voltmeter leads:
alternator B+ to battery's positive terminal
failure to operate with a high current draw could result from:
an internal short in starter
the charcoal canister is normally "purged":
at hot cruise conditions
The instant the ignition switch is turned to the start position:
both of the pull-in and the hold-in windings are energized
in a typical port injection engine, the fuel pressure us regulated:
by a regulator located on the fuel return side of the fuel rail
The by-products of the perfect ( complete) combustion of gasoline and air are:
carbon dioxide, water nitrogen
reversing the polarity of the voltage applied to a permanent magnet DC motor will:
cause it to operate in reversed direction
Which of the following is not true. Over charging a battery:
causes the battery to put out greater current
what is used to prevent exhaust gas from damaging air injection components:
check valve
what abnormal gasoline combustion type would most likely occur with; high compression ratio, high engine temperature and heavy engine load condition?
detonation
fuel delivery lines from the tank to the pump are larger on which engine?
diesel
You are going to remove the battery from a negative ground vehicle and replace it with a new one. Which of the following procedures is correct?
disconnect the ground cable first, and reconnect the positive cable first
to know if the battery is charging or not the meter must be moved to point: ( image 2 yellow sticker)
either C or D
the standardized name for the sensor that measurers the temperature of the coolant is called an:
engine coolant temperature (ECT)
How many times must a monitored system exceed the parameters for that system for a pending code to be set?
exceed the parameters in two drive cycles
when heated at atmospheric pressure, the volume of a specific mass of vaporized gasoline will:
expand and become less dense
true or false, is diesel cloud point is the temperature that diesel fuel vaporizes
false
permanent magnet starters don't have any:
field windings
the octane rating of a fuel refers to:
its ability to resist detonation
the highest conversion efficiency of an oxidizing two way catalyst uses an air fuel ration:
leaner than 14:7:1
what type of primary ignition triggering mechanism would you see in the pattern below? (image 3)
magnetic pulse generator
which trigger mechanism for primary ignition switching requires no current input:
magnetic pulse generator
the higher the cetane number, the _______ volatile the fuel and the _______ lag time will be from injection until ignition
more , shorter
should the ERG valve be open at hot idle, under hard deceleration or at WOT conditions?
no, all options are wrong
fuel pressure on a throttle body injected vehicle should:
not be affected by throttle angle
if pressure on a specific sample (volume) of air were doubled and the temperature remained unchanged, the resulting volume would be:
one half of the original and twice as dense
the slip rings in an alternator carry:
only field current
The voltage regulator controls voltage by:
opening the field circuit
As the alternator field current increases, the:
output increases
What is the correct sequence for starting system testing
perform a battery test then test starter draw
the type of vacuum signal that is at its strongest just above idle is:
ported
The E.G.R. valve can be controlled by:
ported vacuum, coolant temperature and exhaust pressure
the temperature at which diesel will no longer flow in the fuel lines is known as its:
pour point
glow plugs are used in diesel engines to:
pre-heat the air in the combustion chamber, cold engine
the picture at right illustrates what combustion chamber situation?
pre-ignition
an alternator converts AC current to DC current by:
rectification
which of the following is not part of routine battery inspection and maintenance
refilling the battery with clean electrolyte
when a knock sensor signals a detonation condition, what does the PCM do to rectify the condition?
retard ignition timing
which of the following is not a common diesel fuel injection system type?
reverse helix
what does the catalytic converter use to break down NOx?
rhodium
alternator drive pulley is attached to the:
rotor
A technician is checking a no-crank condition on a vehicle. After installing an appropriate test meter, the technician notes an extremely large current draw and the cables from the battery to the starter seemed to jump. what would cause this condition?
the engine is seized or mechanically locked
spark occurs at the spark plug when:
the magnetic field collapses in the secondary coil winding
testing an engine coolant temperature sensor shows 100 000 ohms resistance at -40 degree Celsius (-40 F) and 70 ohms at 130 C (266F). what does this indicates?
the sensor is functioning normally written its design limits
in a well tuned engine at full operating temperature, zirconia O2 sensor voltages should:
toggle with voltage swings less than 350mV (low) to greater than 550 mV (high)
hydrocarbons found in the exhaust are: unburned fuel
unburned fuel
L.P. Gas in a vehicle storage tank is:
under high pressure and stored as a liquid
a recent development in NOx reduction in diesel exhaust systems includes injection of a substance (diesel exhaust fluid) into the exhaust before the catalyst. what is the substance?
urea
the OBDII drive cycle is designed to complete a series of tests, but may also provide which function?
verify a repair to a system component
an engine with an EGR valve that is stuck closed may exhibit:
warm engine, detonation
to isolate a spark plug wire with high resistance on a waste spark vehicle, the technician would best look at which of the following modes on an oscilloscope?
waste parade
when testing a shorted rectifying diode with an ohmmeter, it should test:
zero resistance in both direction