well i know a tiny bit about electrical stuff, i dont consider myself compent enough to install a new head unit, but heres my attempt at this thoughoug quiz [based off what i know and what i feel is common sense]
What are the four different electronic properties you will encounter?
3, Resistance, voltage, ohms, inductance
What is voltage?
4, The relationship between current, resistance and power
Which of the following cannot be determined by Ohm's Law?
1, If a certain gauge wire is too small
Using a multimeter, you can measure current and voltage, but you cannot directly measure resistance in a live circuit.
1, True
A Watt represents the conversion of one joule per second into:
4, All of the above answers are correct
What is the impact of Kirchoff's Voltage Law if there is a poorly crimped terminal in the installation?
3, One Volt dropped through a connector will reduce Voltage to the equipment by two Volts (1:2 ratio)
Which of the following is a characteristic of a resistor?
5, All of the above are correct
An Electrolytic capacitor is known for its excellent sound quality and is used for the higher crossover frequencies.
1, True
How do you determine the total resistance of a circuit?
1, Add up all of the resistances
What does a passive crossover for a basic two-way system consist of?
1, Two passive filters
3, One capacitor for the tweeter and one inductor for the woofer
-i figure its one of the two-
According to Ohm's Law, if you want to calculate current you would:
4, Divide the voltage into the resistance
What is the general rule regarding power and signal leads?
1, Always run power and signal leads next to each other
2, Depending on the installation, it is acceptable to cross the battery lead
3, Run the wiring parallel to the car's factory wiring for ease of routing
4, Depending on the installation, it is acceptable to cross the battery lead
5, All of the above answers are correct
-dont know, i would of figure 1 = crosstalk 2+4 are the same answer and again i figure its crosstalk 3= well a high power amp lead might cause issues with the cars sensores etc 5= i dont think so.
though i suppose speaker wiring might be able to run next to the stock wires for ease..
Ground loops are the most frequent cause of noise problems in car audio installations.
1, True
When should you use crimp connectors in installations?
4, Never
How do you test for alternator whine?
1, Turn the audio system on, turn the volume all the way down, then rev the engine
Which of the following is the best diagnostic tool for use on a brand new car with a computer-controlled ignition, computerized climate control system and a trip computer?
3, DMM (digital multimeter)
If you want to check the amperage draw of a component or security system brain, and the suspect component is not blowing the supplied fuse, you should set your amperage scale on your VOM to a range above the fuse rating of the component.
1, True
Which type of fire extinguisher is best suited for a mobile electronics shop?
1, Type A
2, Type B
3, Type C
4, Halon
5, All of the above are acceptable
-ah. i know know what type is what but i would suspect a powder extinguiser is best, water one would cause issues and CO2 one im not sure of.
What is the first step involved in troubleshooting for system noise problems?
2, Identifying the type of noise
At what frequency is the human ear most sensitive?
3, 1,000 Hz to 2,000 Hz
What is sympathetic vibration?
3, Distortion
An audio signal is an electrical representation of what?
2, Octave
Destructive interference refers to two speakers whose sound waves are working against each other and are out of phase by:
2, 90 degrees
A magnetic Reed Switch, also called a magnetic proximity switch:
1, Uses magnetic force to cause a set of contacts to connect
The most common device to interrupt a vehicle's starter is a:
1, Electronic switching capacitor
An impact sensor the best device to detect breaking glass during a break-in attempt?
1, True
A pulse or universal timer can be used to:
1, Remove unwanted EMI from your security system
A glass-mount antenna will transmit and receive best:
3, When mounted between or above the defogger grids
Extending the length of the RG58 coax cable supplied by the manufacturer can result in as much as 3dB of signal loss.
1, True
The small holes on the side of the hands-free microphone are commonly used for...
2, Noise canceling
Painting a cellular antenna mast with car paint typically causes up to 1 dB of signal loss.
1, True
Which of the following materials will not attenuate the signal from a GPS Antenna:
4, Factory pigment tinted glass
The best choice of mounting position for the GPS antenna is:
4, On the rear deck or dash
The length of antenna cable on a GPS receiver is:
4, Uncorrelated
A true VSS signal will vary in proportion with:
2, Engine RPM
When testing a digital VSS with a DMM set to a minimum 30VDC range, the DMM display should:
1, Fluctuate between 5 to12 volts with tire rotation
hope i did well, what the "genral rule for power and signal leads" a trick question?
