MECP advanced test questions & answers 2024/2025
how much power is a source unit that puts out 6 volts per channel into 4 ohms? - ANSWERS9 volts per channel
The measurement of the voice coil of a speaker with a DMM set to ohms while at rest is which of the following? - ANSWERSDC Resistance
...
how much power is a source unit that puts out 6 volts per channel into 4 ohms? - ANSWERS9 volts per
channel
The measurement of the voice coil of a speaker with a DMM set to ohms while at rest is which of the
following? - ANSWERSDC Resistance
A security system is being blamed for draining the battery on a vehicle overnight. A series parasitic
current drain test is preformed with a DMM. Technician a says if the current drain is 150ma or below, it's
fine and not indicative of the security system causing the issue. Technician B says to compare the current
draw initially measured with a second measurement of the security system disconnected from power.
Whose statements are correct? - ANSWERSNeither Technician A nor Technician B correct.
An RTA is connected to the speaker outputs of the OEM amplifier. A pink noise signal is played in the
factory system and the output from the OEM amplifier is shown on the RTA. Technician A says this signal
is a 20-20kHZ full range signal. Technician B says this a low passed signal that shows it connects to the
factory subwoofer. who is correct? - ANSWERSNeither Technician A nor Technician B is the correct.
To measure the signal level of an analog audio signal, a DMM must have a measurement scale that
displays which one of the following units? - ANSWERSAC Volts
What is the name of signal that electrically reports engine speed? - ANSWERSTachometer Signal
In a positive switching, high current ignition system, which of the following ignition switch circuits has
+12v in the RUN and START positions, but not during ACC. - ANSWERSIgnition #1 (primary or " True"
Ignition)
In a positive switching, high current ignition system, which of the following ignition switch circuits has
+12 in the ACC and RUN positions, but not during START? - ANSWERSIgnition #2 (secondary Ignition)
, After a remote starter is manually shut down and the security system is armed, the Rap feature keeps
the radio on and needs to be shut down electronically. The door switch circuit is normally open, positive
trigger. Two technicians suggest a wiring an SPDT relay to solve the RAP shutdown, each of which is
wired differently from the other. Based on the diagrams (A= Technician A, B= Technician B), who is
correct? - ANSWERSOnly Technician B
Based on the diagram, including the position of the probes on the DMM, which one of the following
accurately describes this type of door trigger circuit? It shows +12v when closed and it shows 0v when
the door is open. - ANSWERSNegative trigger, normally closed
When a variable voltage is present on a vehicle's low current ignition, accessory and start wires, which
one of the following electronic components must accompany a remote starter's hard wired (analog)
connections to replicate those specific voltages? - ANSWERSResistors
A subwoofer with an EBP of 110 indicates a vented (ported) enclosure the preferred enclosure. -
ANSWERSTrue
In a General Motors vehicle where am OEM head unit uses a "GM LAN" Network communication, this is
classified as low Speed Fault Tolerant CAN (LSFT CAN) application. - ANSWERSFalse
A 6dB/Octave crossover is also called which one of the following filters? - ANSWERS1st Order Filter
In an OEM European vehicle wiring schematic, what does the color code abbreviation WS represent? -
ANSWERSWhite.
To find voltage drops on amplifier grounds, what setting should be used on the DMM while loading down
and testing between the amplifier ground and the vehicle's chassis ground point? - ANSWERSDC Volts
When using a DMM to test diodes not connected in a circuit, what scale listed must the DMM have to
complete this task? - ANSWERSOhms
Based on the oscilloscope signal displayed including its RMS voltage, Technician A says it's an audio
signal and it's clipping whereas Technician B says it's a data-bus signal with the bus in an active (or
"dominant") state. Who is correct? - ANSWERSNeither Technician A nor Technician B is correct.
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