Test 3

Question 1

Liquids _____ compressible.

Answer 1

are not

Question 2

Describe the purpose of variable resistors R1 and R2

Answer 2

Trim pots to balance the bridge network, if the resistor values change due to component aging

Question 3

What is the energy source of a steam pressure system?

Answer 3

boiler

Question 4

Suppose a liquid at 60 degrees Fahrenheit has a specific gravity of 6.28. If the measured pressure at the bottom of the tank in which it is stored is 51.3 psi, what is the height of the liquid?

Answer 4

Between 19.803 and 17.917

solution psi=height x (S.G.) x 0.433

height =psi/((S.G. x 0.433)

height=51.3psi/(6.28x0.43)=18.8655

Question 5

What is the gage pressure measured by a manometer using mercury if the reference column rises 1.5 inches and the pressure column lowers 1.5 inches?

mercury constant is 0.491

Answer 5

Between 1.54 and 1.39

solution : DP=(Pressure 2-Pressure 1)x fluid constant

3 x 0.491 = 1.473 psig

Question 6

The pressure exerted by a gas in an open container will _____ when its temperature rises.

Answer 6

stay the same

Question 7

A _____ pressure detected by a Bourdon tube causes the coil to unwind.

Answer 7

higher

Question 8

Convert an absolute pressure of 64.7 psia to gage pressure. _____ psig

Answer 8

50.0 (with margin: 0.0)

PSIA-14.7=PSIG

Question 9

The output of a pneumatic transmitter produces ____________________ psi when the zero adjustment of a calibration procedure is performed.

Answer 9

3

Question 10

A transmitter __________.

Answer 10

converts a signal from the sensor into a standardized signal and is used to boost and send signals to a remote location

Question 11

The method of taking a measurement of one variable to determine the value of another variable is referred to as a ___________ measurement.

Answer 11

inferred

Question 12

Convert an absolute pressure reading of 62.7 psia to a gage pressure

Answer 12

0.0 (with margin: 0.0)

Between 47.0 and 49.0

Question 13

If a liquid is removed from an enclosed container, the pressure on __________.

Answer 13

The inside wall of the container is less than the pressure exerted on the outside wall

Question 14

The power source for a pneumatic system is a ____________________.

Answer 14

compressor

Question 15

The span adjustment in the calibration procedure of an instrument is made when the process variable is __________.

Answer 15

in its maximum condition

Question 16

Name a functional application for an Induction Furnace

Answer 16

melting iron in a foundry

Question 17

RTDs are considered what type of device

Answer 17

Linear

Question 18

The emissivity value of a non-blackbody is _____.

Answer 18

1

Question 19

The resistance of an RTD is

Answer 19

directly proportional to temperature.

Question 20

The process by which thermal energy transfers through a solid is called _____.

Answer 20

conductance

Question 21

What type of pyrometer views a lightbulb and target simultaneously in a viewfinder?

Answer 21

optical pyrometer

optical

Question 22

Give a functional application of a thermocouple.

Answer 22

measures oven and furnace temperatures, molten plastic, and nuclear reactors

Question 23

What does a thermopile consist of?

Answer 23

several thermocouples connected in series

Question 24

The __________ junction of the thermocouple is considered the reference junction

Answer 24

cold

Question 25

The emissivity of a non-blackbody material is

Answer 25

between 0 and 1

Question 26

If the temperature in the following figure increases, current in the circuit will __________. example: drawing ----_____( A ) _[ N ] [ T ] -___________[ C ]

Answer 26

Increase

Question 27

Thermal movement from [ Select ] to [ Select ] is called thermodynamics

Answer 27

from [Hot ] to [cold]

Question 28

A(n) __________ has a positive temperature coefficient.

Answer 28

RTD

Question 29

A __________ can be determined by measuring the frequency at which it is radiated from an object.

Answer 29

temperature | visible color

Question 30

The boiling point of water is ____________________ degrees Celsius

Answer 30

100

Question 31

As the temperature of an object increases, the frequency of the electromagnetic waves that it emits __________.

Answer 31

increases

Question 32

What is the alpha (α )value for an RTD that has 50 ohms of resistance at freezing, and 87.05 ohms at 100 degrees Celsius? round your answer to 4 decimal places .

Answer 32

0.0074

Question 33

If the temperature to which the circuits in the following figure are exposed increases, the voltage measured by the meter will __________ example : circuit ``` |-------------( > ><< ) NTC | | | | | |--------| | > (V) |--------------- < -------| ```

Answer 33

NTC= Negative Temperature Coefficient increase

Question 34

The speed at which fluid moves through a pipe is | called _____.

Answer 34

velocity

Question 35

To avoid distorted liquid flow, the sensor should not be placed within(___) to (____) pipeline diameters of an obstacle.

Answer 35

[5] [20]

Question 36

A velocity meter [ Select ] capable of measuring mass flow.

Answer 36

[is not ]

Question 37

A rotary-vane flowmeter [ Select ] classified as a positive displacement device.

Answer 37

[Is]

Question 38

The pulses transmitted upstream in an ultrasonic flowmeter are _____ waves.

Answer 38

sound

Question 39

In a Coriolis flow meter, the angle at which the tube twists is __________ proportional to the amount of liquid which passes through it

Answer 39

directly

Question 40

If water is forced through a pipe with an inside diameter of 4 inches and a flow velocity of 30 feet per second. Do not include the units of measurement in your answer. Compute the exact answer, then convert to a rational number. Do not include any value to the right of the decimal and do not round your answer Example 33.3334 = 33 what is the volumetric flow rate? = ft3/min What is the mass flow rate? = lb/min Question 42 practice

Answer 40

One pint of water weighs one pound (1.04316 lbs/pint). One gallon of water weighs 8.3453 pounds. 231 cubic inches to one gallon of water. One cubic foot of water contains 7.48052 gallons. The weight of one cubic foot of water is 7.48052 gallons times 8.3453 pounds, which equals 62.42718356 pounds of water per cubic foot. Don't spend alot of time on this ( math example) just remember how to do this Answers 157 = ft3/min 9801 = lb/min

Question 41

In a Coriolis flow meter, the angle at which the tube twists is __________ proportional to the amount of liquid which passes through it.

Answer 41

directly

Question 42

A flow rate that is too high can cause an undesirable __________.

Answer 42

pressure | heat

Question 43

The slower the conductive fluid flows through an electromagnet flow detector, the __________ the voltage induced.

Answer 43

smaller

Question 44

The R number range of __________ is the transition range between laminar and turbulent flow

Answer 44

7,000-8,000

Question 45

Solids that float on liquids are referred to as __________.

Answer 45

slurry

Question 46

What type of sensor is used to detect vortices in a vortex flow meter?

Answer 46

pressure

Question 47

A Coriolis flow meter is a __________ type of flow meter.

Answer 47

mass

Question 48

The unit of flow measurement is primarily based on __________

Answer 48

flow rate