MECP Basic Test Questions & Answers 2024/2025
Alternating Current (AC) - ANSWERSEnergy that alternates back and forth at a certain frequency that is measured in hertz.
(IMPORTANT): Audio signals are also measured in AC.
Accessory Power - ANSWERSThe source of power that gives 12 volts when...
Alternating Current (AC) - ANSWERSEnergy that alternates back and forth at a certain frequency that is
measured in hertz.
(IMPORTANT): Audio signals are also measured in AC.
Accessory Power - ANSWERSThe source of power that gives 12 volts when the ignition key is in the ACC,
and RUN positions, BUT NOT at START.
Alternator - ANSWERSGenerates AC voltage, and rectifies it into DC Voltage, The alternator is the primary
source of the vehicles power while the engine is running.
Anode - ANSWERSThe positive pole of a diode
Bandpass Filter - ANSWERSA device which incorporates both high-pass and low-pass filters in order to
limit both ends of the frequency range.
Bass - ANSWERSLow audio frequency considered to be below 125 Hz.
BCM - ANSWERSBody Control Module
Bluetooth - ANSWERSShort-Range protocol allowing connections to wireless devices on a 2.4 GHz band
up to 30 feet.
Brain - ANSWERSThe common term used to refer to the main control unit of a security system.
Cathode - ANSWERSThe negative pole of a diode
, Clipping - ANSWERSDistortion that occurs when a power amplifier is over driven. This can be seen
visually on an oscilloscope. the peaks of a wave form are "clipped off" at the signal's ceiling.
Crossover - ANSWERSA device that separates the different frequency bands and redirects them to
different components.
Current - ANSWERSThe rate of electrical flow through a conductor between objects of opposite charge,
symbol is "i" or "A" measured in Amps.
Direct Current (DC) - ANSWERSA flow of electrons that travels only in one direction.
Decibel (dB) - ANSWERSUsed to measure the ratio between two power levels.
Diode - ANSWERSA two-electrode device that allows a voltage to pass through it in one direction only.
DIN - ANSWERSDeutsche Industrie Norman. DIN refers to industrial standards that are used in the
manufacture of many goods in Europe, DIN refers to a standard headunit dimension that fits into many
cars.
DMM - ANSWERSDigital Multimeter. Gives precise readings of voltage, current, or ohms. this type of
meter "samples" the input and feeds it to a digital readout.
ECM - ANSWERSElectronic Control Module.
ECU - ANSWERSElectronic Control Unit.
Farad (F) - ANSWERSThe basic unit of capacitance.
Gain - ANSWERSRefers to the degree of signal amplification.
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