TABLE OF CONTENTS | 1. | What is the prime use of a regulator? |
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| 2. | Where is an actuator used? |
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| 3. | What is an instrument pilot operated pressure regulator? |
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| 4. | What do you understand by fail-safe "open"? |
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| 5. | What are the methods used to load regulators? |
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| 6. | What are the methods used to control actuators? |
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| 7. | Where are electrical contactors used? |
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| 8. | How is the position of a valve communicated back to the controller? |
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| 9. | When are opto-isolators used? |
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| 10. | Where would you use a safety valve? |
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| 11. | Why is a DIAC used in a TRIAC trigger circuit? |
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| 12. | Name the various types of electronic power control devices? |
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| 13. | What are the differences between the SCR and the TRIAC? |
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| 14. | What are the differences between the TRIAC and the IGBT? |
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| 15. | Name the various types of valve families. |
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| 16. | Name the various valve configurations that can be found within the globe valve family. |
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| 17. | A valve has a CV of 88. What is the pressure drop in the valve when 1.8 gal/s of a liquid with a SW of 78 lb/ft 3 is flowing? |
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| 18. | Describe a three-position globe valve. |
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| 19. | In Fig. 11.14, a TRIAC with a 5 V trigger level is used with 12 V zeners. It is required to be able to control the power in the load from full to half power. What is the value of the capacitor C if the potentiometer R 2 is 25 k ?? |
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| 20. | In Fig. |
