BI_1B

Question 1

What are two types of measurement?

a) direct and straight
b) direct and inferred c) inferred and straight d) straight and servomechanism

Answer 1

b) direct and inferred ref: p.3

Question 2

How would you find the height of water in a tank with only a pressure gage?

Answer 2

H = P / 0.433 x G P= pressure gage reading G= specific gravity of third used ref: p.3

Question 3

What is meant by primary element?

Answer 3

the first point that changes is a controlled system ref: p.3

Question 4

Define: The controlling means

Answer 4

consists of those elements of a controller which are involved in producing a corrective action ref: p.6

Question 5

Define: The Final control element

Answer 5

Is that portion of the controlling means which directly changes the value of the manipulation variable ref: p.6

Question 6

Cycling is the periodic deviation above and below the set point value,

a) True
b) False

Answer 6

a) true ref: p. 6

Question 7

Define: Resistance

Answer 7

Resistance is any component or part that opposes the free transfer of energy between two capacities ref: p.7

Question 8

Name four modes of control:

Answer 8

‘1. Proportional 2. Floating 3. Proportional plus reset 4. On and Off ref: p.10

Question 9

On-off control is also used on devices or systems that require full output or no output to function

a) True
b) False

Answer 9

‘a) True ref: p.10

Question 10

Two terms related to the one-to-one relationship of proportional controller are called:

Answer 10

1. Proportional band 2. Throttling range ref: p.11

Question 11

Mathematically gain is related to proportional band as:

a) Ppb = Rcv/Rfce x 100%
b) gain = 1/Ppb = (Rfce/Rcv)
c) h = P/0.433 x G
d) gain = Rcv/Pfce x 100%

Answer 11

b) gain = 1/Ppb = (Rfce/Rcv) ref: p.12