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) If input voltage decreases in voltage regulator, Q2 must do what to maintain constant output? - ANSWER -Decrease resistance to drop less voltage (voltage of