Mobile Electronics Quiz

1. What unit is capacitance measured in?

Farads

Henries

Cycles

Amps

2. What is the purpose of an electronic crossover?

To Keep The Speakers From Blowing

To Send The Correct Frequencies To The Correct Speakers

To Make The Bass Louder

To Make The System Sound Better

3. Which of the following is true about a standard lead acid car battery?

Contains Six Cells And Has A Nominal Voltage Of 2.11 Volts Per Cell When Fully Charged

Contains Eight Cells And Has A Nominal Voltage Of 12 Volts Per Cell When Fully Charged

It Is The Main Source Of Electrical Power While The Vehicle Is Being Driven

Converts Dc From The Alternator To Ac Voltage

4. Of the following, which would most likely to cause NOISE in your stereo system?

Power Wire Gauge Is Too Small

Running The Ground Wire More Than 12 Inches

Running The Power Wire And Rca Cables On The Same Side Of The Car

Speaker Wire Gauge Is Too Small

5. Full power can be achieved from high-current amplifiers by doing what?

Increasing Ac Voltage To The Amp

Lowering The Ohm Load

Increasing Dc Voltage To The Amp

Running Amp In Mono Instead Of Stereo

6. What is the most common cause of alternator whine?

The Alternator Is Faulty

A Weak 12 Volt Car Battery

Poor Quality Loudspeakers

A Ground Loop

7. In a conventional loudspeaker, what is the purpose of the spider?

Provide The Main Restoring Force For The Speaker

All Of These Choices

To Keep Dust And Dirt Out Of The Voice Coil Gap

To Keep The Cone Centered Over The Pole Piece

8. If you have a 4 ohm subwoofer with a 100 watt continuous power rating, what fuse rating should you use to protect the subwoofer from overload?

5 Amp Fuse

2.5 Amp Fuse

1 Amp Fuse

None Of These Choices

9. To avoid noise interference, how many inches would be best for audio signal wiring to be run from stock wiring or power wires?

3

18

12

6

10. Which one of the following statements best describe a high pass filter?

A Filter That Only Allows Frequencies Under 10,000 Hz To Be Passed

A Filter That Passes All Frequencies Above A Given Cutoff Frequency

A Filter That Passes All Frequencies Below A Given Cutoff Frequency

A Filter That Only Allows Frequencies Over 100 Hz To Be Passed

11. A band pass loudspeaker enclosure can be designed to increase speaker efficiency, but at the expense of what?

Low End Frequency Response

Sound Quality

Lower Power Handling

Higher Distortion

12. The first spatial type sensor used in automotive security systems was what kind of sensor?

Radio Field Disturbance

Ultrasonic

None Of These Choices

Infrared Field Disturbance

13. What does the word "isobaric" mean?

None Of These Choices

Separate Air

Double Loaded

Constant Pressure

14. What type of amplifier uses square waves to produce sound?

Class A

Class D

Class C

Class B

15. The maximum allowable RF output power for a mobile cellular phone is how many watts?

15

7.5

3

5

16. A standard 12-15 ft. length of RG-58 coaxial cable will have a loss at cellular frequencies of how many dB?

0.5

2

1

3