ATT Test
ATT Test 8 Actual Exam Complete Questions with Correct
Answers (Verified Answers) Already Graded A+2025
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
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 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? -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? -Correct Answer ✔Full wave
How is frequency determined for half wave rectifier? -Correct Answer ✔Output
frequency is same as input frequency
1|Page
, ATT Test
How is frequency determined for full wave rectifier? -Correct Answer ✔Output is twice
the input frequency
How is frequency determined for bridge rectifier? -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 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 to maintain
constant level of V out (series volt regulator)? -Correct Answer ✔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)? -Correct Answer ✔Increase R1
resistance to decreases voltage drop on R1
What is the purpose of parallel voltage regulator? -Correct Answer ✔Adjust current flow
to maintain V out at constant level
In parallel voltage regulator, V out increases when what happens? -Correct Answer
✔DC input increases or load current decreases
In parallel voltage regulator, V out decreases when what happens? -Correct Answer
✔When DC input decreases or load current increases
What makes a zener diode different from junction diode? -Correct Answer ✔Zener diode
is designed operate in breakdown
When does zener diode conduct reverse current? -Correct Answer ✔When reverse bias
voltage is HIGHER than Vz (diode acts like resistor)
When diode is forward biased, what is the output voltage in shunt regulator? -Correct
Answer ✔0.7V
When reverse biased lower than Vz, what happens to zener diode? -Correct Answer
✔Acts like an open
2|Page
ATT Test 8 Actual Exam Complete Questions with Correct
Answers (Verified Answers) Already Graded A+2025
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
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 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? -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? -Correct Answer ✔Full wave
How is frequency determined for half wave rectifier? -Correct Answer ✔Output
frequency is same as input frequency
1|Page
, ATT Test
How is frequency determined for full wave rectifier? -Correct Answer ✔Output is twice
the input frequency
How is frequency determined for bridge rectifier? -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 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 to maintain
constant level of V out (series volt regulator)? -Correct Answer ✔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)? -Correct Answer ✔Increase R1
resistance to decreases voltage drop on R1
What is the purpose of parallel voltage regulator? -Correct Answer ✔Adjust current flow
to maintain V out at constant level
In parallel voltage regulator, V out increases when what happens? -Correct Answer
✔DC input increases or load current decreases
In parallel voltage regulator, V out decreases when what happens? -Correct Answer
✔When DC input decreases or load current increases
What makes a zener diode different from junction diode? -Correct Answer ✔Zener diode
is designed operate in breakdown
When does zener diode conduct reverse current? -Correct Answer ✔When reverse bias
voltage is HIGHER than Vz (diode acts like resistor)
When diode is forward biased, what is the output voltage in shunt regulator? -Correct
Answer ✔0.7V
When reverse biased lower than Vz, what happens to zener diode? -Correct Answer
✔Acts like an open
2|Page
