Et 372 week 6 assignment – final control

Final Control

Work the problems below. To receive any credit, you must show all work. You may submit your work in a word processing document or in a pdf file. Graphic files are not acceptable submissions. Your file submission document should be entitled Week6AYourGID (replace YourGID with your specific GID).

  1. An SCR with a 5V gate trigger level is used with a 12V zener diode, and the capacitor is 0.15uF. What value of R2 will give full control of the power to the load down to zero?
  2. A stepping motor has 120 steps per revolution. Find the digital input rate that produces 10.2 rev/s.
  3. What force is generated by a 85 kPa acting on a 25 cm2 area diaphragm?
  4. Find the proper valve size in inches for pumping a liquid flow rate of 580 gal/min with a maximum pressure difference of 50 psi. The liquid specific gravity is 1.3.







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