ATT TEST 8 QUESTIONS WITH CORRECT DETA ILED
ANSWERS- GRADED A
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 1 / 2
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 Q2 decrease) If load current increases in voltage regulator, how is base to emitter biasing affected? - ANSWER✔✔FB increases If load current decreases in voltage regulator, how is base to emitter biasing affected? - ANSWER✔✔FB decreases If load current increases in voltage regulator what needs to be done to maintain constant output? -ANSWER✔✔Decrease resistance to drop less voltage If load current increases in voltage regulator, what needs to be done to maintain constant output? -ANSWER✔✔Decrease resistance to drop less volts What two conditions cause Vout to INCREASE in voltage regulator? -ANSWER✔✔ Input voltage increases or load current decreases What two conditions cause Vout to DECREASE in voltage regulator? -ANSWER✔✔ Input voltage decreases or load current increases
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