Caco Knowledge Test
- 1.which of the follow are all parts of a subwoofer?
- A.
Coil, wiring, capacitor, steel, surround
- B.
Big plain, little plate, coil, glue, spider
- C.
Cone, coil, pole, back plate, tinsel lead
- D.
Cone, coil, spider, port, back plate, top plate
- 2.which is more important for a voice coil fitment in a motor
- A.
Tighter to the top plates gap
- B.
Tighter to the pole
- 3.what is BL curve
- A.
Saturation in the gap
- B.
Inductance of the coil
- C.
Motor force B x L
- D.
BL of a woofer over an excursion range
- 4.there are ________ cubic inches in a cubic foot
- 5.which of the follow are functions of a pole vent
- A.
Circulate air to cool the coil
- B.
Increase motor BL
- C.
Let the smell come out if the coil gets hot
- D.
Relieve pressure under the dust cap
- 6.which voice coil has a tighter pack of wire windings
- A.
4'' 4 layer flat wire aluminum
- B.
3" 4 layer round wire copper
- 7.adding an aluminum faraday ring to the pole piece can (2 answers)
- A.
Decrease effective voice coil inductance
- B.
Help remove heat from the former
- C.
Lower the impedance of the coil
- D.
Lower thermal handling of the coil
- 8.voice coils have a "slit" in the former only to adjust the diameter when winding the coil
- A.
True
- B.
False
- 9.different cone materials experience different resonant frequencies
- A.
True
- B.
False
- 10.the cone area of a 4 12" subs is 48"
- A.
True
- B.
False
- 11.if a voice coil is centered in a subwoofer gap (middle of coil in the middle of the top plate) what is it considered
- A.
Underhung
- B.
Overhung
- 12.making an existing port in a vented enclosure longer will raise the tuning
- A.
True
- B.
False
- 13.bigger enclosures allow subwoofers to better handle power mechanically
- A.
True
- B.
False
- 14.what options are there to wire two dual 2 ohm subwoofers
- A.
2 ohm
- B.
.5 ohm
- C.
4 ohm
- D.
8 ohm
- 15.a 4" 4 layer copper coil will weigh the same as a 4" 4 layer aluminum coil
- A.
True
- B.
False
- 16.which of the following occur when a power wire is shortened from 20 feet down to 10 feet
- A.
The wire gets warmer when used
- B.
Voltage drop lessens
- C.
Current capacity increases
- D.
Current capacity remains the same as the previous length
- 17.the current coming from an amplifier is direct current
- A.
False
- B.
True
- 18.where is a subwoofers air gap located on the motor
- A.
Inside the pole vent
- B.
From back plate to top plate
- C.
On top of the top plate
- D.
Between the top plate and pole piece
- 19.an alternator turns mechanical energy into AC which is then turned into DC
- A.
False
- B.
True
- 20.what does an ammeter measure
- A.
Voltage over distance
- B.
Current sag
- C.
Amperage
- D.
Power usage
- 21.what does an attenuator do
- A.
Pick up radio signal
- B.
Turn on the remote wire signal
- C.
Decrease or increase the strength of a signal
- D.
Nothing at all
- 22.magnetic flux in the gap, measured in Tesla-meters, is represented by "B"
- A.
True
- B.
False
- 23.if a subwoofer enclosure has a "double baffle" it means which of the following
- A.
The port is reinforced
- B.
The box is double the thickness all round
- C.
The enclosure has bracing
- D.
The side that holds the subwoofer is double the nominal thickness of the rest of the box
- 24.which of the follow is a 4th order
- A.
Ported chamber inside of a larger ported chamber
- B.
A ported chamber sealed in a sealed box
- C.
Sealed chamber inside of a ported chamber
- D.
One sealed chamber
- 25.two 12v batteries wired in series will equal 16v
- A.
True
- B.
False
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