What are the four different electronic properties you will encounter?
4, Voltage, current, resistance, power
though 3 phase AC and other AC is present
What is voltage?
2, The electrical pressure that moves charged particles in a circuit
Or the "potential difference" between two points, not neccesarilly moving anything.
Which of the following cannot be determined by Ohm's Law?
5, All of the above are correct
Using a multimeter, you can measure current and voltage, but you cannot directly measure resistance in a live circuit.
2, False
using V/I=R
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?
2, One Volt dropped through a connector will reduce Voltage to the equipment by One Volt
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.
2, False
How do you determine the total resistance of a circuit?
4, divide the voltage into the current
V/I=R
What does a passive crossover for a basic two-way system consist of?
3, One capacitor for the tweeter and one inductor for the woofer
According to Ohm's Law, if you want to calculate current you would:
2, Divide the resistance into the voltage
V/R=I
What is the general rule regarding power and signal leads?
3, Run the wiring parallel to the car's factory wiring for ease of routing
The "general" rule (if there is such a thing) is to not run power and signal wires together
Ground loops are the most frequent cause of noise problems in car audio installations.
2, False
poor installation's in general are.
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.
-You should use a good quality Clamp meter.
Which type of fire extinguisher is best suited for a mobile electronics shop?
-Dry powder, or CO2 if no dry powder
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?
2, The natural resonance of an object
??never heard anyone use that term....
An audio signal is an electrical representation of what?
1, Sound wave
Destructive interference refers to two speakers whose sound waves are working against each other and are out of phase by:
3, 180 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:
3, Electromagnetic switch
An impact sensor the best device to detect breaking glass during a break-in attempt?
2, False
Motion sensors are better, infra red heat signature processors are the best
A pulse or unversal timer can be used to:
a million things including a few of the ones mentioned(dumb question)
A glass-mount antenna will transmit and receive best:
1, When mounted over two defogger grids
2, When it is mounted over an FM antenna grid
3, When mounted between or above the defogger grids
4, When placed at a 45 degree angle to the ground plane
???dont know, never had to do it..
Extending the length of the RG58 coax cable supplied by the manufacturer can result in as much as 3dB of signal loss.
2, False
If the anntenna is tuned correctly.
The small holes on the side of the hands-free microphone are commonly used for...
1, Decoration
2, Noise canceling
3, The mounting clip
4, Water drainage
??? IS this really needed to be known?
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:
2, Preset
A true VSS signal will vary in proportion with:
1, Engine temperature
2, Engine RPM
3, Ignition voltage
4, Battery voltage
5, Vehicle speed
What does VSS stand for, everyone uses different terminology, from tafe to tafe, workshop to workshop.....
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
2, Starts at 12 volts and rises as tire rotation increases
3, Change between 0 and 5 to12 with the engine running
4, Increase from 0 volts as the engine RPM increases
AS above...