NCCER missed questions

A valve has a linear-flow characteristics when the:

differential pressure corresponds directly to the valve stem position

All the following valves are used to regulate flow, EXCEPT: plug, butterfly, needle

gate

When selecting a regulator, choose the:

overpressure protection that protects the regulator

Density is analyzed using all the following methods EXCEPT: Air bubbler, displacement, densitometer

peptide

A photosensor is

silicone-controlled rectifier

All of the following are typical applications of photocells EXCEPT: Automatic lighting control, position sensing, battery charging

size detection

A transmitter has a range 0-304.7" wc. What is the range in psi?

0-11 psi

The hydrostatic pressure created in a 10 foot tank with 8 feet water level is:

8 psi

Which of the following must be determined before selecting a pressure-reducing regulator?

Capacity required

The process parameter that is selected for control is called

Controlled variable

The word "piezoelectric" refers to a certain class of crystals that produce an electric signal when they are mechanically

Deformed

If the proportional band of a controller is adjusted to the MINIMUM possible value, the controller action is likely to be:

Excellent

All of the following are volumetric flow rates EXCEPT: SCFS, SCFM, SCFH

SCFH

Optimal gain is the maximum allowable value of gain in which the system is

Stable

"Proving" a loop involves

VERIFYING desired interaction of loop components through simulation

The device that is used to check the integrity of tubing is the

Wallace and Tieman calibrator

Which of the following adjustments on a pressure transmitter sets the minimum range value?

Zero

carbon dioxide is produced commercially

as a byproduct of manufacturing

A chemical, classified as a base, harms a human body by causing all the following EXCEPT: severe respiratory burns, dissolved skin tissue, irritation to nose and throat membranes

calcification of the tongue

Pressure is expressed mathematically as:

decreases when controller signal increases

Multiple instruments within a loop share a common:

loop number

Shift registers are designed to do all the following EXCEPT:

translate data within registers