Spark plugs either use a ________ design or a washer type of gasket to form a seal between the spark plug and the cylinder head.

Tech A states that contact breaker point ignition systems were used on earlier vehicles. Tech B states that these systems required regular maintenance to run properly. Who is correct?

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Tech A states that ignition modules are used in virtually every type of ignition system except the contact breaker point system. Tech B states that ignition modules are also used in the contact breaker point system. Who is correct?

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The main advantage of the distributor-less ignition system is the elimination of all the mechanical parts included in a distributor assembly such as all of the following EXCEPT:

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Tech A says that a slightly lean mixture offers good fuel economy and low exhaust emissions. Tech B says that a mixture that is too rich fouls spark plugs and causes incomplete burning. Who is correct?

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A _______ carries fuel from the tank to the engine.

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Gasoline direct injection (GDI) places the fuel injectors in the cylinder head where they can spray fuel directly into the combustion chamber.

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The carburetor supplies the engine with the correct air fuel mixture for all conditions of operation.

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About how much signal voltage is generated by a throttle position sensor at closed throttle?

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In a vehicle, thermistors are used in various sensors related to:

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The on and off time of a stepper motor relates to its duty cycle, which is generally expressed as a:

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When the oxygen sensor reaches its operating temperature, around ______, it sends an output voltage to the control unit to signal whether the mixture is richer or leaner than a lambda value of 1.

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The DLC has helped to standardize automotive terms used by engineers and technicians alike.

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OBDII codes use a series of ________ grouped together to identify which system, component, or circuit is at fault.

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The engine misfire monitor directly detects a fault by monitoring:

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A(n) ________ is a device able to electronically communicate with and extract data from the vehicle's one or more onboard computers.

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DVOM's may be used in testing actuators.

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Tech A says that coolant circulates through some intake manifolds to help warm them up. Tech B says that some intake manifolds use an electric heater grid to warm up the intake air. Who is correct?

Select one

Manifolds using this type of construction lighten manifold weight by up to 50% and contribute to higher fuel efficiency.

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A(n) _______ is turned by the crankshaft, compresses the air, and forces it into the engine.

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Catalytic converters were introduced in vehicles in the mid-_____ and were designed to reduce exhaust emissions.

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Donut gaskets use ________-wound steel and filler material, which is shaped into a round design that, when installed in ball-shaped pipe, provides seal while allowing the pipes to be joined even if they are slightly out of line.

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Water is formed by the engine when two ________ molecules from the fuel are drawn into the combustion chamber and are combined with one oxygen molecule.

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The stoichiometric ratio, also referred to as lambra, is the ratio of air to fuel at which all of the oxygen in the air and all the fuel are completely burned. The stoichiometric ratio for gasoline is:

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Tech A says that scavenging creates a low pressure in the cylinder by means of the exhaust gases flowing through the exhaust pipe. Tech B says that increased back pressure in the exhaust system increases the scavenging effect. Who is correct?

Select one:

Replacement of gaskets in the crankcase to fix oil leaks due to pressure build-up will eventually cause _______.

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A float-type fuel gauge is placed in the tank that raises or lowers to indicate fuel level.

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LPG tanks are fitted with a special refueling port and an over-fill protection device an automatic fuel limiter which ensures that the tank cannot be filled past the safe fill limit of ______.

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A fuel cell is an electrochemical device that combines hydrogen and oxygen to produce ________.

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Which of the following equipment is used to test for voltage drops and high resistance within the primary circuit?

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Identify the test in which a hole is drilled in the exhaust pipe in front of the converter so that an emission analyzer tube can be inserted into the exhaust stream entering the converter:

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Tech A states that contaminants prevents the exhaust gases from interacting with the catalyst converter. Tech B states that lead and silicone contamination cannot generally be cleaned from the catalyst. Who is correct?

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The EPA requires that the malfunction indicator lamp (MIL) turn on and one or more specific diagnostic trouble codes (DTC's) be set in memory:

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Tech A states that the possible causes of an abnormal exhaust smoke can be researched in the appropriate service information. Tech B states that applicable TSB's most likely list the possible causes of an abnormal exhaust. Who is correct?

Select one:

If the EGR valve of a vehicle is stuck in an open position, the engine will ________.

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Tech A states that testing the secondary air injection system starts with checking for any related DTC's. Tech B states that all new vehicles have a secondary air injection system. Who is correct?

Select one:

Some newer vehicles use high-performance spark plugs that are made with platinum, iridium, or silver palladium and do not require replacement until the engine reaches 100,000 miles (160,000 km).

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If the coil primary circuit has continuity, the reading should be 12 volts or more when:

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An injector pressure drop test to see if the injector is restricted with deposits can be done using a(n):

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The DTC's are a good place to commence the diagnostic process.

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An exhaust system back-pressure test is used to:

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________ from our atmosphere is converted to usable food for plants by bacteria in the ground.

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Which of these usually increases primarily because of the growing gap of the spark plug as it wears over time?

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If the reach is too _______, the piston may strike the spark plug while moving up.

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On newer vehicles, the ignition module functions are completely controlled by the PCM, in many cases eliminating the need for an ________ ignition module.

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The spark timing for distributorless ignition systems is controlled by the _______.

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Which of these air-fuel mixtures gives good fuel economy and low exhaust emissions suitable for cruising conditions?

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In GDI engines, which of the following is the least risky way to remove the carbon on intake valves and runners, especially if the buildup is very heavy?

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Tech A states that engine management systems were born out of a need for greater efficiency and emission control. Tech B states that the engine management system controls the operation of the engine and all of its related system. Who is correct?

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Which of the following is the best tool to measure the voltage output from a throttle position sensor?

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Tech A states that the PCM of an engine gathers information from various sensors and components. Tech B states that the PCM can also process that information based on stored data and command components to operate in specified ways. Who is correct?

Select one:

The speed-density method of determining the amount of air entering the engine takes into account all of the following EXCEPT:

Select one:

Tech A says that OBD I and OBD II DLC connectors are different from each other. Tech B says that OBD II standardizes the designations for diagnostic trouble codes (DTC's). Who is correct?

Select one:

Engine related freeze-frame data can be accessed from the vehicle's:

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A monitor is a computer's test of its system components and circuits for malfunctions that would cause emissions to increase _______ times more than FTP (Federal Test Procedures) regulations allowed.

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Bidirectional scanners:

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What is the pressure release valve called that protects the turbo if the wastegate fails on the turbocharger?

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Tech A says that the PCV system recirculates exhaust gases into the intake manifold. Tech B says that the PCV system recirculates blowby gases into the intake manifold. Who is correct?

Select one:

When servicing high-voltage hybrids, techs should always wear their leather gloves.

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