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ATT TEST 8 EXAM LATEST ACTUAL EXAM 100
QUESTIONS AND CORRECT DETAILED
ANSWERS WITH RATIONALES (VERIFIED
ANSWERS)
What are 5 parts of a power supply?
Correct answer: Input, rectifier, filter, regulator, protection
Which two parts of a power supply are optional?
Correct answer: Regulator and protection
What is the purpose of a power supply?
Correct answer: To convert AC power into smooth DC power
What does the input of a power supply do?
Correct answer: Step up or down the AC input voltage
What does the rectifier do in a power supply?
Correct answer: Changes AC into pulsating DC
What does the filter do in a power supply?
Correct answer: Changes pulsating DC into smooth DC
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How type of components do filters use?
Correct answer: Reactive components
What does a regulator do in a power supply?
Correct answer: Maintains the output voltage at a constant level
despite changes in load current
What does the protection circuit do in a power supply?
Correct answer: Prevents damage to power supply if load
becomes faulty, limits or disables output
The half-wave rectifier is the same as what circuit?
Correct answer: Series limiter
Which rectifier is the least efficient using only half the input?
- Half-wave
- Full-wave
- Bridge
- None of the above
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Correct answer: Half-wave
Which two rectifiers require two input signals 180 degrees out of phase?
Correct answer: Full-wave and bridge
Which rectifier uses a center-tapped transformer?
- Half-wave
- Full-wave
- Bridge
- None of the above
Correct answer: Full-wave
How is frequency determined for half-wave rectifier?
Correct answer: Output frequency is same as input frequency
How is frequency determined for full-wave rectifier?
Correct answer: Output is twice the input frequency
How is frequency determined for bridge rectifier?
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Correct answer: Output is twice the input frequency
What is the purpose of series voltage regulators?
Correct answer: To adjust voltage drop to maintain V out at
constant level
In a series voltage regulator, V out INCREASES when what happens?
Correct answer: Load current decreases OR DC input increases
In a series voltage regulator, V out DECREASES when what happens?
Correct answer: Load current increases OR DC input decreases
If load current decreases or DC input increases, what needs to be done toMaintain constant level of V out (series voltage regulator)?
Correct answer: Increase R1 resistance to increase voltage drop
on R1