ATT Test 8 Questions with correct ANSWERs- Graded
A
-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
, If reverse biased lower than Vz, what is output voltage of shunt regulator? -
ANSWER -Output is applied voltage
When reverse biased higher than Vz, what is the output voltage of shunt regulator?
- ANSWER -Vz
Which component changes resistances to maintain constant V out (zener diode
regulator)? - ANSWER -Q1
Which component sets output voltage (zener diode regulator)? - ANSWER -D1
(holds Q1 at Vz)
The voltage on emitter is established by what in zener diode regulator? -
ANSWER -Action of Q1
If voltage increases what must happen to keep output voltage constant (zener
diode regulator)? - ANSWER -Q1 collector-emitter resistance must increase
If voltage decreases what must happen to keep output voltage constant (zener
diode regulator)? - ANSWER -Q1 collector-emitter resistance must decrease
In a voltage regulator, which component maintains a constant V out? - ANSWER
-Q1
In a voltage regulator, which components set voltage? - ANSWER -D1 and Q2
What does R2 do in voltage regulator? - ANSWER -Varies conduction of Q2
(changes Vce)
If input voltage increases in voltage regulator, Q2 must do what to maintain
constant output? - ANSWER -Increase resistance to drop more voltage (voltage of
Q2 increase)
A
-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
, If reverse biased lower than Vz, what is output voltage of shunt regulator? -
ANSWER -Output is applied voltage
When reverse biased higher than Vz, what is the output voltage of shunt regulator?
- ANSWER -Vz
Which component changes resistances to maintain constant V out (zener diode
regulator)? - ANSWER -Q1
Which component sets output voltage (zener diode regulator)? - ANSWER -D1
(holds Q1 at Vz)
The voltage on emitter is established by what in zener diode regulator? -
ANSWER -Action of Q1
If voltage increases what must happen to keep output voltage constant (zener
diode regulator)? - ANSWER -Q1 collector-emitter resistance must increase
If voltage decreases what must happen to keep output voltage constant (zener
diode regulator)? - ANSWER -Q1 collector-emitter resistance must decrease
In a voltage regulator, which component maintains a constant V out? - ANSWER
-Q1
In a voltage regulator, which components set voltage? - ANSWER -D1 and Q2
What does R2 do in voltage regulator? - ANSWER -Varies conduction of Q2
(changes Vce)
If input voltage increases in voltage regulator, Q2 must do what to maintain
constant output? - ANSWER -Increase resistance to drop more voltage (voltage of
Q2 increase)
