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SELF-TEST 1. Draw the schematic symbols representing the SPST, SPDT, DPST, and DPDT manu- ally operated switches. 2. Draw the schematic symbols representing the NO and NC forms of limit switch. 3. For the control circuit in Figure 1-56, determine the condition of the 12-V lamp during the time in which the enable input is at a logic low. 4. When a logic high occurs at point A in Figure 1-56, what would be the value of the base current entering the Darlington pair? 5. What is the effective beta for the Darlington pair in Figure 1-56? Is it sufficient to allow saturation of the Darlington pair? 6. In Figure 1-56, how much current will Bow through the relay coil when it is energized? 7. What is the purpose of D, in Figure 1-567 &. In Figure 1-56, what is the purpose of the relay contact that is placed in parallel with Q.? 9. When a logic high occurs at point A in Figure 1-56, what will be the condition of the motor and the 12-V lamp? 10. In Figure 1-56, what will happen to the motor and lamp at the instant the pulse at point A falls to a logic low? 412 120 V NC limit switch 14 AC tor Relay 7400 Lamp Enable 270 Ka NO NC relay relay NO elay AC autral 450 ms 02 V Vokge at point A Figure 1-56

SELF-TEST 1. Draw the schematic symbols representing the SPST, SPDT, DPST, and DPDT manu- ally operated switches. 2. Draw the schematic symbols representing the NO and NC forms of limit switch. 3. For the control circuit in Figure 1-56, determine the condition of the 12-V lamp during the time in which the enable input is at a logic low. 4. When a logic high occurs at point A in Figure 1-56, what would be the value of the base current entering the Darlington pair? 5. What is the effective beta for the Darlington pair in Figure 1-56? Is it sufficient to allow saturation of the Darlington pair? 6. In Figure 1-56, how much current will Bow through the relay coil when it is energized? 7. What is the purpose of D, in Figure 1-567 &. In Figure 1-56, what is the purpose of the relay contact that is placed in parallel with Q.? 9. When a logic high occurs at point A in Figure 1-56, what will be the condition of the motor and the 12-V lamp? 10. In Figure 1-56, what will happen to the motor and lamp at the instant the pulse at point A falls to a logic low? 412 120 V NC limit switch 14 AC tor Relay 7400 Lamp Enable 270 Ka NO NC relay relay NO elay AC autral 450 ms 02 V Vokge at point A Figure 1-56

Introductory Circuit Analysis (13th Edition)
Introductory Circuit Analysis (13th Edition)
13th Edition
ISBN:9780133923605
Author:Robert L. Boylestad
Publisher:Robert L. Boylestad
Chapter1: Introduction
Section: Chapter Questions
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SELF-TEST 1. Draw the schematic symbols representing the SPST, SPDT, DPST, and DPDT manu- ally operated switches. 2. Draw the schematic symbols representing the NO and NC forms of limit switch. 3. For the control circuit in Figure 1-56, determine the condition of the 12-V lamp during the time in which the enable input is at a logic low. 4. When a logic high occurs at point A in Figure 1-56, what would be the value of the base current entering the Darlington pair? 5. What is the effective beta for the Darlington pair in Figure 1-56? Is it sufficient to allow saturation of the Darlington pair? 6. In Figure 1-56, how much current will flow through the relay coil when it is energized? 7. What is the purpose of D, in Figure 1-56? 8. In Figure 1-56, what is the purpose of the relay contact that is placed in parallel with Q.? 9. When a logic high occurs at point A in Figure 1-56, what will be the condition of the motor and the 12-V lamp? 10. In Figure 1-56, what will happen to the motor and lamp at the instant the pulse at point A falls to a logic low? +12 V* 9120 V p+12 V NC limit switch 9+5 V 14 AC motor Relay coil, 7400 Lamp R Enable NO 270 kn NC relay 1 relay 1 A- 115 Qa NO elay I AC neutral 145 V 450 mS 0.2 V Volage at point A Figure 1-56
Transcribed Image Text:SELF-TEST 1. Draw the schematic symbols representing the SPST, SPDT, DPST, and DPDT manu- ally operated switches. 2. Draw the schematic symbols representing the NO and NC forms of limit switch. 3. For the control circuit in Figure 1-56, determine the condition of the 12-V lamp during the time in which the enable input is at a logic low. 4. When a logic high occurs at point A in Figure 1-56, what would be the value of the base current entering the Darlington pair? 5. What is the effective beta for the Darlington pair in Figure 1-56? Is it sufficient to allow saturation of the Darlington pair? 6. In Figure 1-56, how much current will flow through the relay coil when it is energized? 7. What is the purpose of D, in Figure 1-56? 8. In Figure 1-56, what is the purpose of the relay contact that is placed in parallel with Q.? 9. When a logic high occurs at point A in Figure 1-56, what will be the condition of the motor and the 12-V lamp? 10. In Figure 1-56, what will happen to the motor and lamp at the instant the pulse at point A falls to a logic low? +12 V* 9120 V p+12 V NC limit switch 9+5 V 14 AC motor Relay coil, 7400 Lamp R Enable NO 270 kn NC relay 1 relay 1 A- 115 Qa NO elay I AC neutral 145 V 450 mS 0.2 V Volage at point A Figure 1-56
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