ATT Test 8 Questions with correct ANSWERs- Graded A
How type of components do filters use? - ANSWER -Reactive components
Which two rectifiers require two input signals 180 degrees out of phase? -
ANSWER -Full-wave and bridge
Which rectifier uses a center tapped transformer? - ANSWER -Full wave
How is frequency determined for half wave rectifier? - ANSWER -Output
frequency is same as input frequency
How is frequency determined for full wave rectifier? - ANSWER -Output is twice
the input frequency
How is frequency determined for bridge rectifier? - ANSWER -Output is twice the
input frequency
What does a regulator do in a power supply? - ANSWER -maintains the output
voltage at a constant level despite changes in load current
What does the protection circuit do in power supply? - ANSWER -Prevents
damage to power supply if load becomes faulty, limits or disables output
The half wave rectifier is the same as what circuit? - ANSWER -Series limiter
Which rectifier is the least efficient using only half the input? - ANSWER -
Halfwave
What is the purpose of series voltage regulators? - ANSWER -To adjust voltage
drop to maintain V out at constant level
In a series voltage regulator, V out INCREASES when what happens? - ANSWER
-Load current decreases OR DC input increases
, In series voltage regulator, V out DECREASES when what happens? - 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)? - 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)? - ANSWER -Increase R1
resistance to decreases voltage drop on R1
What is the purpose of parallel voltage regulator? - ANSWER -Adjust current flow
to maintain V out at constant level
In parallel voltage regulator, V out increases when what happens? - ANSWER DC
input increases or load current decreases
In parallel voltage regulator, V out decreases when what happens? - ANSWER
When DC input decreases or load current increases
What makes a zener diode different from junction diode? - ANSWER -Zener
diode is designed operate in breakdown
When does zener diode conduct reverse current? - 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? -
ANSWER -0.7V
When reverse biased lower than Vz, what happens to zener diode? - ANSWER
Acts like an open
How type of components do filters use? - ANSWER -Reactive components
Which two rectifiers require two input signals 180 degrees out of phase? -
ANSWER -Full-wave and bridge
Which rectifier uses a center tapped transformer? - ANSWER -Full wave
How is frequency determined for half wave rectifier? - ANSWER -Output
frequency is same as input frequency
How is frequency determined for full wave rectifier? - ANSWER -Output is twice
the input frequency
How is frequency determined for bridge rectifier? - ANSWER -Output is twice the
input frequency
What does a regulator do in a power supply? - ANSWER -maintains the output
voltage at a constant level despite changes in load current
What does the protection circuit do in power supply? - ANSWER -Prevents
damage to power supply if load becomes faulty, limits or disables output
The half wave rectifier is the same as what circuit? - ANSWER -Series limiter
Which rectifier is the least efficient using only half the input? - ANSWER -
Halfwave
What is the purpose of series voltage regulators? - ANSWER -To adjust voltage
drop to maintain V out at constant level
In a series voltage regulator, V out INCREASES when what happens? - ANSWER
-Load current decreases OR DC input increases
, In series voltage regulator, V out DECREASES when what happens? - 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)? - 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)? - ANSWER -Increase R1
resistance to decreases voltage drop on R1
What is the purpose of parallel voltage regulator? - ANSWER -Adjust current flow
to maintain V out at constant level
In parallel voltage regulator, V out increases when what happens? - ANSWER DC
input increases or load current decreases
In parallel voltage regulator, V out decreases when what happens? - ANSWER
When DC input decreases or load current increases
What makes a zener diode different from junction diode? - ANSWER -Zener
diode is designed operate in breakdown
When does zener diode conduct reverse current? - 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? -
ANSWER -0.7V
When reverse biased lower than Vz, what happens to zener diode? - ANSWER
Acts like an open
