Fundamentals of Industrial Instrumentation and Process Control

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...

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