Exit Exam :-) Posted on December 1, 2011 by admin Reply Let’s See What You’ve Learned! 1. Which of the properties below can be considered to be electrical pressure? Voltage Current Power A tail pipe 2. Which is the properly rated circuit breaker to protect a 100 watt amplifier running at 2 ohms mono? 20 amps 30 amps 35 amps None of the above Explanation Here When Correct 3. If 5 volts is applied to a 1 ohm resistor, how much current will flow through the resistor? 0.5 amps 1 amp 5 amps None of the above Explanation Here When Correct 4. If an unfused power wire (which is connected to the positive terminal of the battery) makes contact with the body of the vehicle, how much current will flow through the wire? No current because the body of the vehicle is not an electrical device. Less than 1 amp of current Not enough to do any damage Enough current to cause an electrical fire Explanation Here When Correct 5. If a two channel amplifier is designed to drive a minimum impedance of 2 ohms per channel. What would the equivalent mono load be? 2 ohms mono 4 ohms mono 8 ohms mono Not enough information Explanation Here When Correct 6. For a sine wave, by what number do you multiply RMS power to get peak power? 2 1.414 1.73 10 Explanation Here When Correct 7. If an amplifier keeps blowing a 20 amp fuse (which was supplied by the manufacturer), what is the maximum size fuse with which you can safely replace the blown fuse? 15 amps 25 amps 20 amps 30 amps, but only until you can get a smaller fuse Explanation Here When Correct 8. If an equalizer is properly set, it will increase the the overall loudness of the system by how many dB? 0 dB 3 dB 6 dB 10 dB Explanation Here When Correct 9. When using a relay, what percentage of the current flowing through the contacts flows through the circuit driving the relay coil? 99% 50% About 10% There is no relationship between the currents flowing through the relay’s coil and the relay’s contacts. Explanation Here When Correct 10. Which types of passive crossovers use capacitors to achieve their rolloff? First order high pass Second order low pass Second order high pass All of the above Explanation Here When Correct 11. Is the amplifier the biggest contributor of harmonic distortion in a car audio system? yes no Explanation Here When Correct 12. Does an amplifier’s temperature have any effect on its reliability? Yes No Do not pick this one! Explanation Here When Correct 14. In the drawing below, what voltage would correspond to the arrow marked ‘A’? RMS voltage Peak Voltage Peak to Peak Voltage All of the above Explanation Here When Correct 15. If your car has a 125 amp alternator and you’re driving down the road fast enough so that the engine speed is high enough to allow the alternator to produce its full rated current and all of your car’s electrical accessories are drawing 110 amps of current, how much current is being supplied by the battery? 110 amps 55 amps 33.5 amps 0 amps Explanation Here When Correct 16. If the slopes on the diagram below are between 6 dB/octave and 24 dB/octave, which is the 12 dB/octave slope? Cyan Red Green Violet Explanation Here When Correct 17. When driving a speaker with an amplifier who’s power rating is lower than the speaker’s power handling rating, how much lower can the amp’s rating be below the speaker’s rating without damaging the speakers? 10% 20% 30% It doesn’t matter if the amp’s power output rating is lower than the speaker’s power handling rating. Explanation Here When Correct 18. A CD player with a s/n ratio of 100dB going to sound how much better than a CD player with a s/n ratio of 90dB (all else being equal). 10% better 50% better 100% better The difference is so little that you will never hear the difference. Explanation Here When Correct
