1. If the potentiometer in Figure 8-16 is adjusted from a setting near the top (higher resistance from wiper to ground) to a setting near the bottom (low resistance from wiper to ground), the average current through Rị will: (a) Not change (b) decrease (c) increase 2. If the diode in Figure 8-16 short, the voltage across RL will: (b) increase (a) Decrease (c) not change AO R RL 120 V ac BỘ R2 Figure 8-16 3. A Thyristors has: (a) Two pn junctions (c) three pn junctions (b) four pn junctions (d) only two terminals

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Homework -1 of Thyristors
1. If the potentiometer in Figure 8-16 is adjusted from a setting near the top (higher resistance from
wiper to ground) to a setting near the bottom (low resistance from wiper to ground), the average
current through Rị will:
(a) Not change
(b) decrease
(c) increase
2. If the diode in Figure 8-16 short, the voltage across R1 will:
(b) increase
(a) Decrease
(c) not change
R
RL
120 V ac
R2
Figure 8-16
3. A Thyristors has:
(a) Two pn junctions
(c) three pn junctions
(b) four pn junctions
(d) only two terminals
4. Common types of Thyristors include:
(a) BITS and SCRS
(b) Diacs and Triacs
(c) FETS and Triacs
(d) UITS and PUTS
5. A 4-layer diode turns on when the anode to cathode voltage exceeds:
(a) The forward-break over voltage
(b) the gate voltage
(d) the forward-blocking voltage
(c) 0.7 V
6. Once it is conducting, a 4-layer diode can be turned off by:
(a) Reducing the current below a certain value
(c) Neither answer (a) nor (b)
(b) disconnecting the anode voltage
(d) answers (a) and (b)
7. An SCR differs from the 4-layer diode because:
(a) It is not a Thyristors
(c) It does not have four layers
(b) it has a gate terminal
(d) it cannot be turned on and off
Transcribed Image Text:Homework -1 of Thyristors 1. If the potentiometer in Figure 8-16 is adjusted from a setting near the top (higher resistance from wiper to ground) to a setting near the bottom (low resistance from wiper to ground), the average current through Rị will: (a) Not change (b) decrease (c) increase 2. If the diode in Figure 8-16 short, the voltage across R1 will: (b) increase (a) Decrease (c) not change R RL 120 V ac R2 Figure 8-16 3. A Thyristors has: (a) Two pn junctions (c) three pn junctions (b) four pn junctions (d) only two terminals 4. Common types of Thyristors include: (a) BITS and SCRS (b) Diacs and Triacs (c) FETS and Triacs (d) UITS and PUTS 5. A 4-layer diode turns on when the anode to cathode voltage exceeds: (a) The forward-break over voltage (b) the gate voltage (d) the forward-blocking voltage (c) 0.7 V 6. Once it is conducting, a 4-layer diode can be turned off by: (a) Reducing the current below a certain value (c) Neither answer (a) nor (b) (b) disconnecting the anode voltage (d) answers (a) and (b) 7. An SCR differs from the 4-layer diode because: (a) It is not a Thyristors (c) It does not have four layers (b) it has a gate terminal (d) it cannot be turned on and off
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