Answers to Odd-Numbered Questions
Chapter 1: Introduction and Review
1. | What is the difference between controlled and manipulated variables? | |
2. | What is the difference between set point, error signal, and correction signal? | |
3. | How many pounds are equivalent to 63 kg? | |
4. | How many micrometers are equivalent to 0.73 milli-in? | |
5. | How many pounds per square inch are equivalent to 38.2 kPa? | |
6. | How many foot-pounds of energy are equivalent to 195 J? | |
7. | What force in pounds is equivalent to 385 N? | |
8. | How many amperes are required from a 110-V supply to generate 1.2 hp? Assume 93- percent efficiency. | |
9. | How many joules are equivalent to 27 ft-lb of energy? | |
10. | What is the sensitivity of an instrument whose output is 17.5 mV for an input change of 7 C? | |
11. | A temperature sensor has a range of 0 to 120 C and an absolute accuracy of 3 C. What is its FSD percent accuracy? | |
12. | A flow sensor has a range of 0 to 25 m/s and a FSD accuracy of 4.5 percent. What is the absolute accuracy? | |
13. | A pressure sensor has a range of 30 to 125 kPa and the absolute accuracy is 2 kPa. What is its percent full-scale and span accuracy? | |
14. | A temperature instrument has a range -20 F to 500 F. What is the error at 220 F? Assume the accuracy is (a) 7 percent of FSD and (b) 7 percent of span. | |
15. | A spring balance has a span of 10 to 120 kg and the absolute accuracy is 3... |