MECP Masters Study Guide
Cars in 1982 - ANS -About 500 wires
\Cars in 1992 - ANS -About 2000 wires
\Appropriate substitute for a relay in a low current DC switching application. - ANS -NPN
Transistor
\Time constant formula for capacitors. - ANS -1 TC = R x C (Resistance x Capacitance)
\Can be placed on a relay to protect transistorized outputs on an ECU. - ANS -Silicon Diode
(place in parallel across the coil terminals)
\In a NPN transistor, the direction of the arrow indicates. - ANS -The N material
\On the OBD-II diagnostic connector the supply B+ and ground are. - ANS -Pin 4 is chassis
ground and pin 16 is B+
\Character that represents an OBD-II network diagnostic trouble code. - ANS -U
\MOSFETS - ANS -metal oxide semiconductor field effect transistor
\JFET - ANS -junction field effect transistor
\Logic gates - ANS -semiconductor that allow the smallest of currents(voltages) to control much
larger voltages or currents
\The "AND" Gate - ANS -both inputs much be True
\The "OR" Gate - ANS -any one of the inputs can be True
\The "NOT" Gate - ANS -simply inverts the input
\Over what conductor configuration is MOST 50 ePHY transmitted? - ANS -A Dual UTP of four
wires
\In an OBD-II complaint DTC what does the first character "U" represent? - ANS -A network
related code
\OBD-II DTCs that do not trigger immediate MIL activation and deley as many as three drive
cycles before triggering an MIL are called soft codes. - ANS -False
\In which pin locations of an SAE J1962 OBD-II connector are the HS CAN High and HS CAN
Low diagnostic bus wires found? - ANS -Pins 6 and 14
\What is the output result of the AND logic gate if input A equals 0 and input B equals 1 ? - ANS
-0
\MECP recommended practice of safely testing voltage using the one-handed rule is for circuit
voltages exceeding 50 volts. - ANS -True
\What is the operating voltage of a LIN bus network? - ANS -12 volts
\What is the recommended shielding gas used in wire-feed MIG welding when welding mild
steel? - ANS -C25
\If using a table-mounted router with a 3/4'' bearing on a 1/2'' flush trim router bit to copy a
template shape what amount of oversize on the copied work piece will result from copying the
original template shape? - ANS -1/8''
\MECP recommended temperatures for using heat guns with vinyl upholstery are between
900-1100 F (482-593c) - ANS -False
\If a small plastic sample sliver of a door panel floats in water, this confirms the panel base
material is what? - ANS -An Olefin-based thermoset
, \When initially cleaning and degreasing plastics to be modified for fabrication or surface, what is
the MECP recommended material to use? - ANS -A pumice-based cleaner
\Starting with 20 volts of signal, what is the voltage gain of +6dBv? - ANS -40 volts
\The Inverse Square Law states that for every doubling of distance from the sound source, the
intensity(loudness) of sound is reduced by 3dB. - ANS -False
\Regardless of the amplifier or head unit output signal voltage, clipped audio signals delivered
directly to the speaker is why speaker voice coils thermally fail. - ANS -False
\What describbes late reflections of over 30mS difference from the primary sound in a listening
space? - ANS -Reverberant Field
\According to MECP recommended practice, in a speaker with a 700Hz Fs, what is the minimum
frequency for a high pass filter? - ANS -1400Hz
\When equalizing an audio system with an upmixer and center channel speaker, what is the
recommend audio signal stimulus. - ANS -L+R Mono Pink Noise
\The Thiele-Small paramater "Le" is the inductance of a speakers voice coil? - ANS -True
\What is the metric equivalent to .5 cubic feet for a subwoofer enclosure? - ANS -14.16 liters
\When testing a positive or negative variable voltage circuit with a DMM, to what unit of measure
should the DMM be set? - ANS -Ohms
\In properly operating HS/MS CAN Bus system, to what voltage do CAN High and CAN Low
measurements add together to total? - ANS -5 volts
\What is MECP recommended practice when making wire to wire connections between
aftermarket interface devices and automotive data bus systems? - ANS -Solder and Tape
\What is the main purpose of a lock detection circuit as found in Hyundai, Kia, Lexus and toyota
vehicles? - ANS -To deter theft
\An automotive transponder key is an example of an electric-coupled transponder system. -
ANS -false
\What function does the neutral safety switch provide to a remote starter? - ANS -It allows the
vehicle to start only if it's in park or neutral.
\What function does a non-data transponder interface device without connections to the vehicles
CAN Bus serve for the remote starter? - ANS -It allows the vehicle think the factory coded key is
actually in the ignition so it can remotely start.
\when testing can bus connections at the vehicles OBD-II connector, which pin number is
recommended to use as a known good chassis ground reference? - ANS -Pin 4
\What is the US Federal Motor Vehicle Safety Standard governing inclusion and functionality of
occupant class safety systems in passenger vehicles, such as seat belts and SRS air bags in
seats of panels? - ANS -FMVSS 208
\What is the center frequency band of bluetooth operation? - ANS -2.45GHz
\what are the three mos common bands covered by in-vehicle radar detectors in the US? - ANS
-X, K, Ka bands
\What broadcast medium does the TMC Alert C message format typically use in North America?
- ANS -FM-RDS
\How many specific bluetooth channels are designated to the operational frequency bandwidth?
- ANS -79
Cars in 1982 - ANS -About 500 wires
\Cars in 1992 - ANS -About 2000 wires
\Appropriate substitute for a relay in a low current DC switching application. - ANS -NPN
Transistor
\Time constant formula for capacitors. - ANS -1 TC = R x C (Resistance x Capacitance)
\Can be placed on a relay to protect transistorized outputs on an ECU. - ANS -Silicon Diode
(place in parallel across the coil terminals)
\In a NPN transistor, the direction of the arrow indicates. - ANS -The N material
\On the OBD-II diagnostic connector the supply B+ and ground are. - ANS -Pin 4 is chassis
ground and pin 16 is B+
\Character that represents an OBD-II network diagnostic trouble code. - ANS -U
\MOSFETS - ANS -metal oxide semiconductor field effect transistor
\JFET - ANS -junction field effect transistor
\Logic gates - ANS -semiconductor that allow the smallest of currents(voltages) to control much
larger voltages or currents
\The "AND" Gate - ANS -both inputs much be True
\The "OR" Gate - ANS -any one of the inputs can be True
\The "NOT" Gate - ANS -simply inverts the input
\Over what conductor configuration is MOST 50 ePHY transmitted? - ANS -A Dual UTP of four
wires
\In an OBD-II complaint DTC what does the first character "U" represent? - ANS -A network
related code
\OBD-II DTCs that do not trigger immediate MIL activation and deley as many as three drive
cycles before triggering an MIL are called soft codes. - ANS -False
\In which pin locations of an SAE J1962 OBD-II connector are the HS CAN High and HS CAN
Low diagnostic bus wires found? - ANS -Pins 6 and 14
\What is the output result of the AND logic gate if input A equals 0 and input B equals 1 ? - ANS
-0
\MECP recommended practice of safely testing voltage using the one-handed rule is for circuit
voltages exceeding 50 volts. - ANS -True
\What is the operating voltage of a LIN bus network? - ANS -12 volts
\What is the recommended shielding gas used in wire-feed MIG welding when welding mild
steel? - ANS -C25
\If using a table-mounted router with a 3/4'' bearing on a 1/2'' flush trim router bit to copy a
template shape what amount of oversize on the copied work piece will result from copying the
original template shape? - ANS -1/8''
\MECP recommended temperatures for using heat guns with vinyl upholstery are between
900-1100 F (482-593c) - ANS -False
\If a small plastic sample sliver of a door panel floats in water, this confirms the panel base
material is what? - ANS -An Olefin-based thermoset
, \When initially cleaning and degreasing plastics to be modified for fabrication or surface, what is
the MECP recommended material to use? - ANS -A pumice-based cleaner
\Starting with 20 volts of signal, what is the voltage gain of +6dBv? - ANS -40 volts
\The Inverse Square Law states that for every doubling of distance from the sound source, the
intensity(loudness) of sound is reduced by 3dB. - ANS -False
\Regardless of the amplifier or head unit output signal voltage, clipped audio signals delivered
directly to the speaker is why speaker voice coils thermally fail. - ANS -False
\What describbes late reflections of over 30mS difference from the primary sound in a listening
space? - ANS -Reverberant Field
\According to MECP recommended practice, in a speaker with a 700Hz Fs, what is the minimum
frequency for a high pass filter? - ANS -1400Hz
\When equalizing an audio system with an upmixer and center channel speaker, what is the
recommend audio signal stimulus. - ANS -L+R Mono Pink Noise
\The Thiele-Small paramater "Le" is the inductance of a speakers voice coil? - ANS -True
\What is the metric equivalent to .5 cubic feet for a subwoofer enclosure? - ANS -14.16 liters
\When testing a positive or negative variable voltage circuit with a DMM, to what unit of measure
should the DMM be set? - ANS -Ohms
\In properly operating HS/MS CAN Bus system, to what voltage do CAN High and CAN Low
measurements add together to total? - ANS -5 volts
\What is MECP recommended practice when making wire to wire connections between
aftermarket interface devices and automotive data bus systems? - ANS -Solder and Tape
\What is the main purpose of a lock detection circuit as found in Hyundai, Kia, Lexus and toyota
vehicles? - ANS -To deter theft
\An automotive transponder key is an example of an electric-coupled transponder system. -
ANS -false
\What function does the neutral safety switch provide to a remote starter? - ANS -It allows the
vehicle to start only if it's in park or neutral.
\What function does a non-data transponder interface device without connections to the vehicles
CAN Bus serve for the remote starter? - ANS -It allows the vehicle think the factory coded key is
actually in the ignition so it can remotely start.
\when testing can bus connections at the vehicles OBD-II connector, which pin number is
recommended to use as a known good chassis ground reference? - ANS -Pin 4
\What is the US Federal Motor Vehicle Safety Standard governing inclusion and functionality of
occupant class safety systems in passenger vehicles, such as seat belts and SRS air bags in
seats of panels? - ANS -FMVSS 208
\What is the center frequency band of bluetooth operation? - ANS -2.45GHz
\what are the three mos common bands covered by in-vehicle radar detectors in the US? - ANS
-X, K, Ka bands
\What broadcast medium does the TMC Alert C message format typically use in North America?
- ANS -FM-RDS
\How many specific bluetooth channels are designated to the operational frequency bandwidth?
- ANS -79
