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1) An SCR has a circuit fusing rating of 90 A²s. The device is being used in a circuit where it could be subjected to a 120 A surge. Determine the maximum allowable duration of current surge.

1) An SCR has a circuit fusing rating of 90 A²s. The device is being used in a circuit where it could be subjected to a 120 A surge. Determine the maximum allowable duration of current surge.

Electric Motor Control
Electric Motor Control
10th Edition
ISBN:9781133702818
Author:Herman
Publisher:Herman
Chapter4: Symbols
Section: Chapter Questions
Problem 3SQ: What do the following abbreviations stand for? a. SPST b. SPDT c. DPST d. DPDT e. NO f. NC
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I. Problem Solving: i. Solve the following problems. Solution is required. ii. Correct answer with no/incorrect solution will be considered INVALID. iii. Use exact values in your solutions. Final answers should be rounded off (at least) in two-decimal places format. (* 1) An SCR has a circuit fusing rating of 90 A²s. The device is being used in a circuit where it could be subjected to a 120 A surge. Determine the maximum allowable duration of current surge. 2) An SCR half-wave rectifier has a forward breakdown voltage of 150 V when a gate current of 1 mA flows in the gate terminal. If a sinusoidal voltage of 400 V peak is applied, determine: a. Firing delay angle (a). b. The average output voltage. c. The power output for a load resistor of 200-ohms. 3) Power of a 100W, 110 V lamp is to be varied by controlling the firing angle of an SCR in a half-wave rectifier circuit supplied with 110 Vac. At firing angle a = 60° a. What RMS voltage is measured in the lamp b. What RMS current is measured in the lamp 4) Referring to Figure below: (Assume values of VBE = VCE(sat) = 0.7 for both device) Given: Vin = 45 V, RA = 10 kn, RB + Rc = 10 kn a. Assuming the Shockley diode reached its breakover voltage and now is in on- state, determine the minimum resistance of the potentiometer (Rc) necessary to turn on the SCR if it requires a 3mA triggering current. b. Determine the gate current when the resistor Rc is adjusted to its maximum value, assuming all devices are turned on. RA Vin RB Rc R₂
Transcribed Image Text:I. Problem Solving: i. Solve the following problems. Solution is required. ii. Correct answer with no/incorrect solution will be considered INVALID. iii. Use exact values in your solutions. Final answers should be rounded off (at least) in two-decimal places format. (* 1) An SCR has a circuit fusing rating of 90 A²s. The device is being used in a circuit where it could be subjected to a 120 A surge. Determine the maximum allowable duration of current surge. 2) An SCR half-wave rectifier has a forward breakdown voltage of 150 V when a gate current of 1 mA flows in the gate terminal. If a sinusoidal voltage of 400 V peak is applied, determine: a. Firing delay angle (a). b. The average output voltage. c. The power output for a load resistor of 200-ohms. 3) Power of a 100W, 110 V lamp is to be varied by controlling the firing angle of an SCR in a half-wave rectifier circuit supplied with 110 Vac. At firing angle a = 60° a. What RMS voltage is measured in the lamp b. What RMS current is measured in the lamp 4) Referring to Figure below: (Assume values of VBE = VCE(sat) = 0.7 for both device) Given: Vin = 45 V, RA = 10 kn, RB + Rc = 10 kn a. Assuming the Shockley diode reached its breakover voltage and now is in on- state, determine the minimum resistance of the potentiometer (Rc) necessary to turn on the SCR if it requires a 3mA triggering current. b. Determine the gate current when the resistor Rc is adjusted to its maximum value, assuming all devices are turned on. RA Vin RB Rc R₂
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