An electronic switch typically controls an ATX power supply. Instead of a hard switch at the main power input, the power button on an ATX system is a sensor input monitored by the computer. What else do you know about Atx power supplies? Take up this quiz and test your knowledge.
True
False
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-12V
Ground
-5V
Power On
+3.3V sense
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Volts x ohms
Volts / Ohms
Henries x Farads
Amps x Volts
(Volts - Amps) / Ohms
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A defective power supply
There's a resource conflict
One of the hard drives is about to go bad
A brownout
The power supply wattage is not high enough to support all the newly added devices.
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+5V
-5V
+12V
-12V
Ground
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Power Good
Power On
Standby
Ground
+3.3V sense
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True
False
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Standby
Power Good
+12V
Power on
+3.3V sense
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Decrease noise in the +12V lines.
Enable software to electronically control the on/off switching of power.
Supply better filtered power for the P4 connector.
Prevent surges from damaging the motherboard.
Provide +3.3V and +5V to the AUX connector.
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+5V
+3.3V
+12V
-12V
"Power Good" signals
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A single voltage
Up to three simultaneous voltages
-9V
The main P1 harness
The mounting screws
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ATX12V 1.0
ATX12V 1.2
ATX
ATX12V 2.0
AT
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Unplug the power cord
Consider the form factors of the power supply, motherboard, and case
Calculate the wattage requirements of the various system components
Test the surge suppressor
Test the power outlet
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+3.3V
+5V
+5V standby
+12V
Power On
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3
4
6
8
15
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+3.3V
-3.3V
+5V
-5V
+12V
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The ATX power supply is incompatible
A bad pin in the P1 connector.
A burned out power supply
The P4 connector is plugged in backwards
The power supply wattage is too low
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True
False
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Disassemble the fan and replace the bearing
Replace the entire power supply
Repack the bearing with grease
Replace the fan
Send the unit back to the manufacturer for warranty service
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Purple
Blue
Yellow
White
Gray
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The motherboard will beep twice and refuse to boot
He'll find that it's impossible
The power supply will begin smoking, sending Bert into a panic
Nothing. Everything will work just fine.
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+3.3V sense
-3.3V sense
+3.3V
-3.3V
+5V
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+5V standby
-5V
Ground
+3.3V sense
Power On
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Power On
+5V standby
Power Good
+12V
-12V
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Ground
24VAC
+5V
+12V
-5V
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+12V to the case fan
+5V and +12V to PATA hard drives
+5V of standby power
+12V to the CPU
+5V and +12V to floppy drives
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+3.3V
+3.3V and +5V
+5V
+5V and +12V
+12V
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Four-pin
6-pin
AUX
P4
Molex
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+3.3V
-3.3V
+5V
+12V
-12V
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