MECP study guide
How much output current mus a security system supply at a minimum to be able to energize at least one standard Bosch Type SPDT automotive relay?
150 ma
According to the MECP Basic Installation Technician study guide, a fuse or circuit breaker should be placed on the power wire no more than. inches from the battery or power source connection point?
18
What is the voltage drop in a diode
.7
In the circuit shown, what is the amount of current flow?
1 ampere
To use Ohm's Law for finding voltage, what is the correct formula?
1*R (Current x Resistance)
On a wire harness, the orange and white wire is?
1-12 volts Illumination Dimmer
How many octaves can the human ear hear
10
Which frequency range listed is an accurate setting for a midrange speaker?
100 Hz-3 kHz Bandpass
What frequency is the human ear most sensitive
1000 to 2000
If an aftermarket car audio system has three amps installed with fuse rating of 25A, 25A, and 5OA respectively, what size fuse should go at the battery connection point if these amps are fed by a single large gauge power wire and that is later split to the different amps?
100A
Which frequency range is an accurate setting for a midrange speaker?
100HZ - 3Khz bandpass
What is the speed of sound in air? Note: At sea level elevation and 70 degrees F/ 21.1 degrees C air temperature
1130 Feet per Second
What is the speed of sound in air?
1130 feet per second
Given the listings in the wire table, what gauge wiring is recommended for an amp with 2 40A fuses on a 15 foot run from the vehicle battery?
2 gauge
Given the listings in the wire table, what gauge wiring is recommended for an amplifier with two 40A fuses on a 15 foot run from the vehicle battery?
2 gauge
Range of a Tweeter speaker?
3Khz to 20Khz
Which section correctly describes the nominal impedance of two sub woofers in series at 2 ohms each at the amp?
4 ohms
A measurement of .04 volts is equal to how many millivolts?
40 millivolts
What is the nominal impedance of a Dual Voice Coil subwoofer of each of its 4 Ohm coils connected in series?
8 ohms
Which two terminals of an SPDT automotive relay are considered the "Coil Terminals"?
85 & 86
A starter interrupt circuit wired to relay contacts as "Normally closed" uses which two contact terminals listed?
87A and 30
Which two switching contact terminals of an SPDT automotive relay are electrically connected when it is at rest?
87A and 30
How do you measure the drain of a battery (what setting on DMM)
???
Which selection correctly describes the nominal impedance load of the two subwoofers at the amplifier?
???
Which two terminals shown in the diagram of an SPDT automotive relay are the coil terminals?
A and E
An amp that has an internal, adjustable cross over for a sub-woofer to play only the base notes is considered one of the following types?
A low pass active cross over filter
When measuring an audio signal output level of an amp at the speaker terminals, what is correct setting for a DMM?
AC Volts
When measuring audio output level of an amplifier at the speaker terminals, what setting should a DMM be set to measure?
AC Volts
When measuring audio signal output level of an amplifier at the speaker terminals, what is the correct setting for a DMM?
AC Volts
Where are passive crossovers intended to be placed in the audio signal path?
After the amplifier, before the speaker.
A line output converter (LOC) is a device that is intended for which one of the following tasks?
Aftermarket amp installation to an OEM head unit or factory amp
A line output converter (LOC) is a device that is intended for which one of the following tasks?
Aftermarket amplifier installation to an OEM headunit or factory amplifier.
In a combustion engine vegicle, while the engine is running what is the primary source of power for the electrical system and any electrical accessories?
Alternator
What does AM stand for
Amplitude modulation
Which of the parameter groups listed accurately describes the components of sound wave?
Amplitude, Wavelength, Frequency, Period
What is the largest single cause for the reduction of transmitter range in a vehicle security system?
An aging or weak transmitter battery
According to the MECP recommended practice, how should the nozzle of a fire extinguisher always be aimed during use?
At the base of the flames
A starter interrupt circuit wired to relay contacts as "Normally Closed" uses which two contact terminals listed?
B and C
When troubleshooting voltage drops on suspected bad grounds of amplifiers measured under a load, a DMM shows voltage between which points?
Between the (-) negative battery post and the (-) negative input of the amplifier
Brake When installing a rear view camera or back up sensor system, what important Light connection must be made to activate either of these units at the correct time?
Brake Light Power
What is the correct terminology for the "Banded Side" of a silicon diode (the side with the line)?
Cathode
When hard wiring a satellite radio power plug that contains a cigarette lighter adapter, what procedure is first recommended before connecting to the vehicles wiring?
Check the voltage input to the unit in case its low voltage
Three parts of the relay
Coil, spring, and contacts
CcA
Cold cranking amps
Com on a meter means
Common black lead goes there
What does the acronym CAN stand for
Control area network
Which one of the vehicles is best suited for a radar (or "field disturbance sensor)?
Convertable
Which one of the vehicles listed is the primary candidate for a radar sensor (or field disturbance sensor?)
Convertible
Testing for a blown electrical system fuse in a vehicle fuse panel while the electrical system is still powered should be done with which setting on the DMM?
DC Volts
Testing for blown electrical system fuses in a vehicle fuse panel should be done with which setting on the DMM?
DC Volts
What is the correct setting for measuring /verifying a high current chassis ground location with a DMM when testing the circuit while its active and current is flowing through the ground point?
DC Volts
When measuring parasitic (standby) current drain with a DMM, which measurement scale is used?
DC milliamps
following measurement scales on a DMM is used? To measure parasitic (standby) current drain, which one of the
DC milliamps
Damping materials (sound deading) can increase dynamic range in a car audio system by which method?
Decreasing the noice floor.
when connecting multiple door triggers to the same input wire on a security system, what electronic components are used to electrically isolate each door trigger?
Diodes
What is the most common technology used for backup up cams to detect objects
Echo location/sonar
What type of switch is a relay
Electromagnetic switch
Which one of the following methods is the lowest quality of audio signal input fro an AUX source input?
FM Transmitter (Modulator)
What is another name fromr the SMB connector
Fakra
A "bass blocker" low pass passive crossover is an application where polarized capacitors are used. (True or False)
False
A "bass blocker" low pass passive crossover is an application where polarized capacitors are used?
False
A normally closed starter interrupt is considered to be higher security than a normally open starter interrupt given all other conditions are equal?
False
A passive hands-free microphone is also known as a "noise cancelling" False microphone? (True or False)
False
According to the MECP Basic Installation Technician study guide, the highest acceptable measured current draw on a vehicle battery with all components off and the engine not running (after the vehicle has gone to "sleep") is 150mA?
False
For in vehicle measurements, test lights are recommended by MECP because they always provide a measured, numeric value to the technician? (True or False)
False
In the circuit illustration, when the switch is closed, current will flow and illuminate the light bulb?
False
Incandescent test lights provide a measured, numeric value of the circuit point to the technician are very high input impedance. (True or False)
False
Multipathing is the correct term used to describe sub band channels of HD Radio broadcasts (HD2, HD3) True or False Multicaoting
False
The MECP recommended practice for the extra cable length on GPS or satellite radio antennas is to coil it up in a loop near the unit to which it connects? (True or False)
False
The correct term used to describe sub band channels of HD Radio broadcasts (HD2, HD3, etc.) is "Multiplexing"?
False
The fuse test in the illustration indicates the fuse is good (not blown)?
False
The fuse test in the illustration indicates the fuse is good (not blown)? According to the MECP Basic Installation Technician study guide, a fuse or circuit breaker should be placed on the power wire no more than 36 inches from the battery or power source connection point?
False
The gain control of an amplifier is the same thing as volume control? (True or False)
False
The main purpose of the fuse at the battery for amps power wire is to protect the amp itself? (True or False)
False
When two 3 ohm loads are connected in parallel, the total resistance will be more than 3 ohms.
False
nstead of flashing the park lamps on new vehicles, its MECP recommended practice to flash the HID headlamps? (True or False)
False
placed on the power wire no more than 36"inches from the battery or According to the MECP study guide, a fuse or circuit breaker should be power source connection point? (True or False) 18
False
There are 144 cubic inches in 1 cubic foot? (True or False)
False (1728 ft^3)
What does FLIR stand for?
Forward looking infrared radar
The Grey and Grey and Black wire on a Wire Harness is?
Front Right
Sound discriminator sensor
Glass sensor
What does the blue section of the NFPA 704 Diamond represent with respect to safety considerations?
Health
What is the correct formula to determine volume of a square or rectangle subwoofer enclosure?
Height x Width x Depth (H x W x D)
What are the 3 MECP recommended steps to troubleshooting noise problems
Identify, Isolate, eliminate
When a CEA standard color code compliant wiring harness adapter has a solid orange wire (no stripes), what does that wire represent?
Illumination (switched by the parking lights)
According to the MECP Basic Installation Technician study guide, which one of the following is regarded as the most common and effective sensory if used singularly?
Impact
According to the MECP Basic Installation Technician study guide, which one of the following is regarded as the most common and effective sensor if used by itself in a vehicle security system?
Impact sensor
High voltage wires in a hybrid are
In an orange loom
What device is measured in henries
Inductors
through holes drilled in metal What is MECP Recommended Practice for running high current wires parts of the vehicle (such as a vehicle firewall)?
Install a plastic or rubber grommet
What is the MECP Recommended Practice for running high current wires through holes drilled in the metal parts of the vehicle (such as a firewall)?
Install a plastic or rubber grommet.
According to the MECP Basic Installation Technician study guide, which one of the conditions listed is the recommended practice for installation of a GPS antenna?
Install it within a direct line of sight to the sky.
A camera intended to specifically for rear view applications must have which one of the following attributes?
It must output a mirror image
During a DC Voltage measurement when the red and black test leads of a DMM are reversed, what will the screen display differently than when they are connected normally?
It will display the DC voltage reading, but with a negative (minus) sign in front of the number.
When the red and black test leads of a DMM are reversed in a DC Voltage measurement, what will the screen display differently than when they are connected normally?
It will display the voltage reading, but with a negative (minus) sign in the front of it.
What's the solid green wire on an aftermarket head unit
Left rear speaker (positive)
LCD stands for
Liquid crystal display
An amplifier that has an internal, adjustable crossover for a subwoofer to play only the bass notes is considered which one of the following types?
Low Pass Active Crossover
MOSFET
Metal oxide semi field effect transistor
mounting objective for a siren under the hood in an auto According to the MECP study guide, what is the primary reliability security system installation?
Mounted Pointing downward toward the ground.
According to the MECP Basic Installation Technician study guide, what is the primary reliability mounting objective for a siren under the hood in an auto security system installation?
Mounted pointing down toward the ground
According to the MECP Basic Installation Technician study guide, sensor inputs on a vehicle security system are typically which polarity or configuration listed?
Negative Polarity
How are the sensor inputs on a vehicle security system electrically configured? (By default and most common)
Negative Polarity Inputs
What is the most common type of relay used in auto security and remote starter installations?
Negative Polarity Inputs
To protect a tweeter what would you use?
Non polarized capacitor
According to the MECP Basic Installation Technician Study Guide, when measuring a low current (MUX) ignition circuit, what setting of the DMM is used to determine the various values of each key switch position?
Ohms
In Bluetooth pbap stands for
Phone book access profile
What type of tool is used to safely pry loose paneling?
Plastic/Nylon Pry tool
What electronic component does the schematic illustration represent?
Potentiometer
Difference between a primary and secondary battery
Primary does not recharge secondary does
Which type of security system output is only active a very short time regardless of how long the transmitter button is pressed?
Pulsed
What is the most popular type of security remote control
RF/ radio frequency
When installing a rear view camera or back up sensor system, what important connection must be made to activate either of these units only during backing up?
Reverse Light Power
What is the most common type of relay used in auto security and remote starter installations?
SPDT
Brake shutdown wire does what?
Shuts down engine when brake pedal is depressed
Name the four bands on a resistor
Significant 1, significant 2, multiplier, tolerance
What is the most common type of relay used in auto security and remote starter installations?
Single pole, double throw (SPDT)
According to the MECP Basic Installation Technician study guide, which one of the following is the recommended connection method for engine disables of any kind?
Soldering
What is dynamic range?
Sound range from lowest (quietest sound in DB) to loudest sound
What does the white section of the NEPA 704 diamond represent with respect to safety considerations?
Special Information
What does the white section of the NFPA 704 Diamond represent with respect to safety considerations?
Special Information
Which wire is a connection point to provide a remote starter input to indicate the engine running or not?
Tachometer circuit wire
Which wire is a connection point to provide remote starter input to indicate the engine running or not?
Tachometer circuit wire
While the engine is running in a combustion engine vehicle, what is the primary source of power for the electrical system and any electrical accessories?
The Alternator
Which of the following describes "true ignition" or "ignition 1" function of a high current ignition switch?
The circuit is active while the key is in RUN and START positions, but not in ACC position.
How should the jaw of a crimp tool be positioned in reference to the seam of the crimp connector?
The jaw should face away from the connectors seam.
VSS stands for
Vehicle speed sensor
What is the "difference of potential" between two points in an electrical circuit?
Voltage
What is the difference of potential between two points in an electrical circuit
Voltage
The difference between the ignition wire and the accessory wire when testing
When at ignition both wires say 12, at start accessory goes to 0
According to the MECP basic Installation Technician study guide, recommended practice for installation of a GPS antenna is using which one of the conditions listed?
Within a direct line of sight to the sky
In the standardized CEA wire color, what color is designated as +12v constant?
Yellow
Range of subwoofer?
capacitor 16hz to 100Hz
What is frequency measured in
hertz
What does HD stand for in HD radio
hybrid digital
How much electrical power consumption results from measured values of 10 Volts and 2 Amps?
20 Watts
What frequency is one octave above 100HZ?
200 Hz
What is the frequency of one octave about 100HZ?
200HZ
What is the minimum of GPS satellites that a GPS receiver needs to determine location?
3
After installing a wired, RF modulated satellite radio system, the AM/FM reception is poor with the satellite radio unit off, yet satellite radio comes in clearly on its assigned FM channel when its on. Which one of the problems listed is the cause?
The vehicle side of the antenna cable is not connected correctly
In an automotive wiring schematic, what does "RED/GRY" indicate?
The wire is Red with a Gray stripe
In what way is the satellite radio signal delivered to compatible in- car receivers?
Through both terrestrial repeaters and satellites
What is the purpose of a LOC (line output converter)
To add RCA outputs
Polarized capacitors are used for what purpose
To store voltage
When a technical support document references a connection at the BCM... to what is that terminology referring?
To the vehicles Body Control Module
A normally open starter interrupt is considered to be higher security than a normally closed starter interrupt given all other conditions are equal? (True or False)
True
A second order filter describes a crossover with a 12dB/octave slope? (True or False)
True
Based on the dial and probe positions, as well as the placement in the circuit path, the DMM is correctly configured to measure DC voltage?
True
It is MECP recommended practice for extra cable length on GPS or Satellite radio antennas to be laid in a zig-zag or S pattern to take up extra slack. (True or False)
True
Power trunk release or power door locks can be added to vehicles that did not come with them as standard equipment?
True
To be a "noise cancelling" hands-free microphone, it must be an active type and not passive?
True
To be a "noise cancelling" hands-free microphone, it must be an active type of microphone and not passive. (True or False)
True
When two 4 ohm loads are connected in parallel, the total resistance will be less than 4 ohms? (True or False)
True
Inductors (such as passive crossovers) placed near high current vehicle wiring can exhibit what condition?
Unwanted Audio System Noise
Inductors in passive crossovers placed near high current vehicle wiring can exhibit which one of the following conditions?
Unwanted audio system noise
Which one of the following is the MECP recommended practice for testing positive and negative speaker wiring and identifying the locations of speakers in the vehicle?
Use a low voltage pulse from a polarity tester
Which one of the following is the MECP recommended practice for testing the + and - speaker wiring and identifying the location of speakers in the vehicle?
Use a low voltage pulse from a polarity tester
When correct polarity of factory speaker wires is unknown during a speaker replacement, what is the MECP recommended practice to determine this quickly?
Use a polarity tester to pop speaker when removed and match the wires to the terminals.
