BI_3B

Question 1

Most control applications employ globe valve bodies.

a) True
b) False

Answer 1

a) True ref: p. 29

Question 2

What is meant by a reverse-acting valve?

Answer 2

Less force is required to position valve than a single ported valve. Ref: p. 30

Question 3

What is meant by flow capacity?

Answer 3

The maximum volume of a fluid that can pass through the wide open valve in a given time ref: p.33

Question 4

What is meant by flow characteristic?

a) the maximum volume of a fluid that can pass through the the wide open valve in a given time.
b) it is the volume of water in gallons per minute that will flow through the wide-open valve per minute with a pressure drop of one. c) it is the relationship of valve lift to flow
d) it is the material the internal parts are made of

Answer 4

a) the maximum volume of a fluid that can pass through the the wide open valve in a given time. ref: p. 32-33

Question 5

Name six types of valve plugs used in control valves:

Answer 5

1. Quick opening 2. Modified linear or V-port 3. Throttling 4. Equal percentage 5. Linear 6. Low and Ultra low flow ref: p.34-36

Question 6

What is the normal size of a throttling valve?

a) 10% (or less) as large as the main line
b) 25% (or less) as large as the main line c) 50% (or less) as large as the main line
d) 90% (or less) as large as the main line

Answer 6

c) 50% (or less) as large as the main line ref: p. 39

Question 7

How are valves classified?

Answer 7

Flow characteristics and flow capacity ref: p. 32

Question 8

Why must the air supply to the pneumatic actuators be filtered?

Answer 8

To keep out oil, moisture, and particles of dirt which could foul the controller. Ref: p43

Question 9

Controlled-volume pumps are often used to inject chemicals into a pumping well.

a) True
b) False

Answer 9

‘a) true ref: p. 48

Question 10

Only valves and pumps can be used as final control elements in an automatic control system.

a) True
b) False

Answer 10

b) false ref: p. 50