Instrumentation study part 2

What is mass?

The amount of matter in an object

Pressure is best described as:

. Force applied over an area

True or false: Pressure increases when the same force is applied over a smaller area.

True

4. What creates atmospheric pressure?

The weight of atmosphere

Gauge pressure (PSIG) uses which reference?

Atmospheric pressure

Atmospheric Pressure at sea level is equal to...

101,325 Pa

_____Is the amount of molecules in a given object no matter where the object is and what container it is in.

Mass

True or false: Pressure is a push or pull on an object that causes it to accelerate

False

Innage is...•

Measurement from the bottom of the tank to the surface of the product.

Ullage is....

measurement from the surface of the product to the top of the vessel

Specific Weight =

rho x acceleration due to gravity

A level switch that sits in the medium for which is measure is a type of _____

Direct Measurement

True or False: Water at 4 degrees C has a density of 1000 Kg/M^3

True

Hydrostatic Pressure =

density x acceleration due to gravity x height

Which type of sensor can sense absolute, gauge, or differential pressure and has an internal operational amplifier?

Piezoresistive sensor

What does the term ratiometric mean?

The output voltage will be proportional to the supply voltage.

True or false: The bubbler system employs the use of float switches.

False

What are two common adjustment terminals located on quality sensor transducers?

Span & zero

1 or P on a pneumatic device denotes what?

Source

What are Harmonics?

Are signals or waves whose frequency is an integral multiple of the frequency cause by non linear loads

What symbol do you use to identify Specific weight?

Y

Water at 4 degrees has a SG of:

1

What is the primary purpose of an instrumentation system?

To measure and monitor process variables

Which statement about absolute pressure is correct?

It is referred to as perfect vacuum

What is specific gravity?

a comparison of a substances density with a reference density.

what happens to mercury in a sealed thermometer when it is heated?

Volume increases, density decreases

Which set lists the three main parts of a UPS described in the Week 3 notes?

Rectifiers, battery, and inverter

What is the purpose of a quick exhaust valve in a pneumatic circuit?

To allow air to escape the circuit faster

What is the function of the rectifier in a typical UPS?

To convert incoming AC into DC

What is the function of the inverter in a typical UPS?

To convert DC into AC output

What is the role of the batteries in a UPS?

To provide stored energy when normal power is unavailable

What is the purpose of signal scaling in an instrumentation system?

To relate a signal value to the corresponding process measurement or range

What is the purpose of a spring return in a pneumatic directional valve?

To return the valve to its default position when pilot actuation is removed

33. How does a double-pilot directional valve typically change position?

By receiving a pilot signal at one side or the other

35. What is the purpose of a pneumatic actuator?

To convert pneumatic energy into mechanical motion

What is the purpose of a pneumatic pilot signal?

To control or shift a valve using a pressure signal

What is the primary difference between a sensor and a final control element in a process loop?

A sensor measures a process condition; a final control element acts on the process

In a pneumatic directional valve designation such as 5/2, what do the two numbers indicate?

Five ports and two switching positions

Offline (standby) UPS

The load normally receives utility power directly; the UPS switches to battery when power fails.

• Line-interactive:

Can regulate certain voltage variations and switch to battery during an outage

• Online double-conversion

The inverter continuously supplies the load, normally providing the strongest isolation from input voltage disturbances

Transfer time

Time required to switch to backup power

Battery autonomy

How long backup power lasts