Basic Instrumentation Ch 8

Question 1

A sight or gauge glass mounted on the side of a liquid tank is to give a physical location of level in the tank

a) true
b) false

Answer 1

b) false

Question 2

liquid level measured by the hydrostatic method is where the level is computed from pressure. For every foot of vertical height (H), column of water produces a pressure (P) of approximately 433 psi.

P = 433 x G x H, where G = specific gravity

a) true
b) false

Answer 2

a) true

Question 3

Electric liquid-level controllers can be used for low and high level alarms, discrete level indicators and they can also operate multiple outflow pumps

a) true
b) false

Answer 3

a) true

Question 4

A popular method of liquid level measurement uses a different pressure transmitter to generate a 4 - 2mA signal?

a) true
b) false

Answer 4

a) true

Question 5

To relieve load on a pumping system, multiple variable speed motors connected parallel may be used

a) true
b) false

Answer 5

a) true

Question 6

Liquid level can be determined from the weight or head pressure that a liquid exerts in a tank?

a) true
b) false

Answer 6

a) true

Question 7

Dipsticks, tapes, or rods are better than gauge glassed because a person must correctly check them to obtain an accurate level measurement?

a) true
b) false

Answer 7

b) false

Question 8

Friction and changes in the specific gravity of the liquid in piloted-operated liquid level controllers can cause errors in the system

a) true
b) false

Answer 8

a) true