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ATT Test 8: Questions And Answers (Complete & Accurate)
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ATT Test 8: Questions And Answers (Complete & Accurate)
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ATT Test 8: Questions And Answers (Complete &Accurate)
What are 5 parts of a power supply? Right Ans - Input, rectifier, filter,
regulator, protection
Which two parts of a power supply are optional? Right Ans - Regulator and
protection
What is the purpose of a power supply? Right Ans - To convert AC power
into smooth DC power
What does the input of a power supply do? Right Ans - Step up or down the
AC input voltage
What does the rectifier do in a power supply? Right Ans - Changes AC into
pulsating DC
What does the filter do in a power supply? Right Ans - Changes pulsating
DC into smooth DC
How type of components do filters use? Right Ans - Reactive components
What does a regulator do in a power supply? Right Ans - maintains the
output voltage at a constant level despite changes in load current
What does the protection circuit do in power supply? Right Ans - Prevents
damage to power supply if load becomes faulty, limits or disables output
The half wave rectifier is the same as what circuit? Right Ans - Series
limiter
Which rectifier is the least efficient using only half the input? Right Ans -
Half-wave
Which two rectifiers require two input signals 180 degrees out of phase?
Right Ans - Full-wave and bridge
, Which rectifier uses a center tapped transformer? Right Ans - Full wave
How is frequency determined for half wave rectifier? Right Ans - Output
frequency is same as input frequency
How is frequency determined for full wave rectifier? Right Ans - Output is
twice the input frequency
How is frequency determined for bridge rectifier? Right Ans - Output is
twice the input frequency
What is the purpose of series voltage regulators? Right Ans - To adjust
voltage drop to maintain V out at constant level
In a series voltage regulator, V out INCREASES when what happens? Right
Ans - Load current decreases OR DC input increases
In series voltage regulator, V out DECREASES when what happens? Right
Ans - Load current increases OR DC input decreases
If load current decreases or DC input increases, what needs to be done to
maintain constant level of V out (series volt regulator)? Right Ans -
Increase R1 resistance to increase voltage drop on R1
If load current increases or DC input decreases, what needs to be done to
maintain constant level of V out (series voltage regulator)? Right Ans -
Increase R1 resistance to decreases voltage drop on R1
What is the purpose of parallel voltage regulator? Right Ans - Adjust
current flow to maintain V out at constant level
In parallel voltage regulator, V out increases when what happens? Right
Ans - DC input increases or load current decreases
In parallel voltage regulator, V out decreases when what happens? Right
Ans - When DC input decreases or load current increases
What makes a zener diode different from junction diode? Right Ans - Zener
diode is designed operate in breakdown
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