Sujet Allez c'est les vacances - Le QUIZ de l'été -

Citation : Your Score is 35/60 or 58.3% of questions answered correctly.

Citation : Anything over 40 questions and I think you are doing ok

Citation : Quiz Results

1. A speaker driven with 500 watts produces 122 dB. Assuming a perfectly coherent summation between two sources throughout their coverage pattern, what would the total output be with two of these speakers driven with 500 watts each?
You answered: A (125) Incorrect!
Correct answer is: C (128)


2. What does the fs parameter tell you about a woofer?
You answered: B (Its free air resonant frequency) Correct!


3. You are on a stage or in a recording studio and see a pink signal cable. What does this tell you.
You answered: C (That the phase has been reversed (pins 2 and 3 swapped)) Correct!


4. Which combination will have the loudest output?
You answered: A (500 watts driven into a speaker with a sensitivity of 103 dB) Correct!


5. What do the letters VCA stand for on a mixing console?
You answered: C (Voltage Controlled Amplifier) Correct!


6. The equation V^2 /R can be used to
You answered: B (Calculate the output power of an audio amplifier) Correct!


7. Which microphone polar pattern would you not want to use for a vocalist on a live stage?
You answered: C (Omni) Correct!


8. What is the major advantage of using two woofers in a push pull combination?
You answered: A (Distortion is lowered) Correct!


9. Which of these microphone setups does not exist?
You answered: B (Phased Pair) Correct!


10. What application would best suit a woofer with a multiple roll accordion pleat surround?
You answered: A (Midrange) Correct!


11. Which of the below test methods involves added weight to a speaker cone?
You answered: C (Free Air) Incorrect!
Correct answer is: B (Delta Mass)


12. Where would you find a T03 package?
You answered: A (In an amplifier) Correct!


13. Which combination of woofer voice coil length and magnetic gap height would give maximum efficiency?
You answered: B (Long coil with short gap) Incorrect!
Correct answer is: C (Equal height coil and gap)


14. What do the letters FET stand for, as in mosfet?
You answered: A (Field Effect Transistor) Correct!


15. Which slope rate is Fourth Order?
You answered: C (24 dB/oct) Correct!


16. Which of these microphones would give the best results for recording an acoustic guitar?
You answered: A (Large diaphragm condenser) Incorrect!
Correct answer is: B (Small diaphragm condenser)


17. Which type of slopes can a minimum phase transform be generated from?
You answered: B (Isometric) Incorrect!
Correct answer is: A (Asymptotic)


18. Which type of enclosure would best suit an 18" woofer with these parameters: Fs: 30 Qts: 0.22 Vas: 428L BL: 23 Mms: 123g SPL: 99 dB
You answered: C (2.3 meter front folded horn with 90L rear chamber) Incorrect!
Correct answer is: B (2.2 meter rear loaded horn (scoop))


19. Which type of enclosure would best suit an 18" woofer with these parameters: Fs: 28 Qts: 0.29 Vas: 250L BL: 28 Mms: 242g SPL: 94.6 dB
You answered: A (4th order bandpass horn hybrid) Incorrect!
Correct answer is: C (2.3 meter front folded horn with 90L rear chamber)


20. You have three 8 ohm woofers connected in parallel, what is the resulting impedance?
You answered: C (2.66 ohms) Correct!


21. How would you turn a non flared port into a flared port?
You answered: C (Use the same length as a non flared port and make the end double the size of the start) Incorrect!
Correct answer is: B (Use the same length as a non flared port and keep the internal volume the same)


22. What do the letters XLR stand for?
You answered: B (Expand, Line, Route) Incorrect!
Correct answer is: A (X series, Latch, Rubber)


23. If we drive 20 watts of power into a speaker with an efficiency of 5%, the output will be
You answered: B (1 Acoustic watt) Correct!


24. If a sound wave encounters a set of ridged obstacles, does it
You answered: A (Have its velocity reduced and maintain this reduced velocity) Incorrect!
Correct answer is: C (Have its velocity reduced then emerge and resume its previous velocity)


25. Which equation calculates the distance that sound waves migrate from near to far field?
You answered: B (d = 1.5 f h^2) Correct!


26. An amplifier is connected to an 8 ohm load, its output voltage is measured at 28.3 V How many watts is this?
You answered: A (100 watts) Correct!


27. A speaker is driven with 100 watts, its output is measured to be 122 dB What will the new SPL be if the same speaker is driven with 1000 watts?
You answered: C (132 dB) Correct!


28. In the above question, what would the sensitivity of the speaker be with 1 watt at 1m?
You answered: B (102 dB) Correct!


29. Where would a wedge be used?
You answered: B (On a stage for the performers monitor mix) Correct!


30. A horn loaded speaker would typically have an efficiency of between
You answered: B (1 to 20%) Incorrect!
Correct answer is: C (20 to 50%)


31. If Fresnel analysis is used and the secondary off axis lobes are to be greater than 12dB down from the main on axis response, what criteria has to be met?
This question was not answered..


32. An enclosure has 15 degree trapezoidal angles, what would the ideal dispersion of each enclosure be for minimum combing or lobbing if two enclosures were tightly arrayed?
You answered: C (30 H x 30 V) Correct!


33. Which type of cone contour provides the greatest high frequency output?
You answered: C (Straight sided cone with reinforcing ribs) Incorrect!
Correct answer is: A (Curvilinear cone)


34. What would you use a DI box for?
You answered: B (For converting an unbalanced line level signal to a balanced microphone level signal) Correct!


35. If negative feedback is used on an amplifier circuit, the result will be.
You answered: A (Lower generator impedance and higher damping factor) Correct!


36. What causes a 4th order bandpass horn hybrid enclosure to suffer from colourations (Horn Honk) at very high power inputs?
You answered: B (The short horn amplifying the high pressure and high velocity air movement) Correct!


37. Why do longer horns not usually suffer from Horn Honk?
You answered: C (The longer horn allows for better impedance matching) Incorrect!
Correct answer is: A (The longer horn path filters out the colouration)


38. What would gating be used for when testing a speaker?
You answered: A (To increase accuracy) Incorrect!
Correct answer is: B (To remove reflections from boundaries)


39. What would you use a Zobel network for.
You answered: B (To change the fundamental resonant frequency of a driver) Incorrect!
Correct answer is: A (To help ensure the effective load on a crossover is resistive)


40. What do the letters DI stand for?
You answered: A (Direct Impedance) Incorrect!
Correct answer is: C (Direct Inject)


41. What does RAB relate to in enclosure design?
You answered: C (Acoustical resistance of driver mechanical losses and box acoustical losses) Incorrect!
Correct answer is: B (Acoustical resistance of box losses caused by internal energy absorption)


42. Which frequency is 3 octaves higher than 350Hz?
You answered: B (2.8Khz) Correct!


43. Which form of measurement does notinclude enclosure diffraction effects?
You answered: B (Anechoic Chamber measurement) Incorrect!
Correct answer is: A (Half Space pit measurement)


44. The major advantage of Isobaric loading is.
You answered: C (Low frequency cutoff point is half what it was for the single woofer) Incorrect!
Correct answer is: B (Enclosure volume can be halved for the same low frequency cutoff point)


45. What steps can be taken to avoid LF beaming in horizontal ground stacked bass arrays (power alley effect)?
You answered: B (Outer placed enclosures can be frequency shaded (lowpass filter the outer enclosures)) Correct!


46. Which best describes the Haas Effect?
You answered: A (The ear gives precedence to first arrived sounds, especially if these are louder) Correct!


47. Which note will 220Hz be on a piano?
You answered: A (D) Incorrect!
Correct answer is: B (A)


48. In which example would you use the equation, 10 log pwr + SPL?
You answered: C (To calculate the maximum output level of a speaker) Correct!


49. Assuming free space positioning, what can be determined by measuring the circumference of a horns mouth?
You answered: B (Its low frequency cutoff point) Correct!


50. A horn speaker system can be explained as.
You answered: C (A driver in a closed box radiating into a pure acoustic resistance) Correct!


51. What do the letters T/S stand for as in T/S parameters?
You answered: B (Thiele and Small) Correct!


52. Where would you find dither?
You answered: A (Inside an amplifier) Incorrect!
Correct answer is: C (On a CD disc)


53. Slew Rate is an indication of.
You answered: A (An amplifier's ability to follow its input signal) Correct!


54. At which frequency does the boundary impedance need to have a significant mass reactive component in order to match the acoustic impedance of the impinging spherical wave?
You answered: B (Low frequencies) Correct!


55. Assuming a point source, the inverse square law dictates.
You answered: B (For each doubling of distance the sound level will drop by 1/4 (6dB)) Correct!


56. A passive 18dB per octave bandpass crossover should contain
You answered: A (Three inductors and three capacitors) Correct!


57. Which is not a quarter wave resonant system?
You answered: B (A Uniform Line Source) Correct!


58. Why might you use an RTA?
You answered: B (To measure a systems frequency response) Incorrect!
Correct answer is: C (To make a systems frequency response flat)


59. On a mixing console, where would you normally connect a compressor?
You answered: B (To the channels insert) Correct!


60. Phantom Power is required by.
You answered: B (The plates of an electrostatic speaker) Incorrect!
Correct answer is: A (Condenser and back electret microphones)


Your Score is 36/60 or 60% of questions answered correctly.
(You scored 36/59 or 61% counting only the questions that were answered)