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2nd Year Instrumentation > Measurement Instruments > Flashcards

Measurement Instruments Flashcards

1
Q

Def : absolute zero

A

The moint at which molecular movement stops

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2
Q

This is for?
Each stands for?

A
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3
Q

Answer 1

A
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4
Q

Def : boiling point

A

The point at which the vapor pressure of a liquid equals the atmospheric pressure resulting in the transition from liquid to gas

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5
Q

This is for?
Components?

A
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6
Q

This is for?
Components?

A
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7
Q

When 2 bodies make contact what happens? (Thermal)

A
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8
Q

4 types of thermowells?

A

-threaded
-flanged
-vanstone
-welded

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9
Q

What should you put between the sensor and thermowell?

A

Heat transfer compound ie thermal conductive grease

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10
Q

Def : 1 thermal time constant

A

How long it takes to get from 0 to 63.2% of the final temp

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11
Q

What is the minimum recommended immersion length of a thermowell

A

6 x diameter

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12
Q

When you require a thermowell in a small pipe what are the 2 mounting options

A
  • 45 degree with tip pointing into the flow
  • on an elbow with rip pointing into the flow
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13
Q

0 degrees Kelvin is

A

-273.5 ‘C

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14
Q

0 degrees Rankine is

A
  • 459.67 ‘ F
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15
Q

If you are calculating linear expansion and copper 16.6/ degree C you multiply that by :

A

10^-6

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16
Q

Thermometer A is ?

A

Total immersion

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17
Q

Thermometer B is

A

Partial immersion ( to immersion mark)

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18
Q

Thermometer C is?

A

Complete immersion

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19
Q

How do you avoid parallax errors?

A

Look at straight on

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20
Q

Thermometer class 1

A

Liquid other than mercury

21
Q

Thermometer class 2 is

A

Liquid-vapour interface

22
Q

Thermometer class 3 is

A

Gas filled

23
Q

Thermometer class 5 is

A

Mercury

24
Q

Def : head effect error

A

When the bulb is high and capillary is low the pressure from capillary cN cause error

25
Q

In a thermometer an invar wire is used for

A

Temp compensation in a mercury system

26
Q

Thermometer: 2 for case compensation

A

2 capillaries or

27
Q

What thermometer classification has the highest range

A

Class 3

28
Q

Type E thermocouple colors

A

Purple

29
Q

With thermocouples the ____ wire is always -

A

Red

30
Q

Thermocouple type j colors

A

Conductor : white
Jacket : black

31
Q

Thermocouple type k colors

A

Conductor : yellow
Jacket : yellow

32
Q

Thermocouple type R colors

A

Conductor: black
Jacket : green

33
Q

Thermocouple type S colors

A

Conductor: black
Jacket : green

34
Q

Thermocouple type T colors

A

Conductor : blue
Jacket : blue

35
Q

A is

A

Reference junction, where the thermocouple wires are connected to cable could be in a jb or wherever

36
Q

ICE point (rtd)

A

@ 0’c it has X ohm res

37
Q

What is the most widely used and most linear material for rtds

A

Platnum

38
Q

What is the difference between industrial grade and lab grade platinum rtds

A

Industrial 100 ohm ice point
Lab 25.5 ohm ice point

39
Q

Rtd European coefficient platnum

A

.003850 ohms/ohm’C

40
Q

Rtds most common errors

A
  • lead wire resistance
  • self heating
  • strain effect
41
Q

What is a b c

A
42
Q

How does a thermistor work

A

Very high ( 2 to 10k) ohm ice point that goes down as temp goes up

43
Q

Thermistor disadvantages

A

Limited temp range -101 to 300
Not linear

44
Q

LRV ma?
URV ma?

A
45
Q

Absorption for black body vs highly polished surface? Reflection?

A

I for black body , 0 for high polished
Opposite for reflection

46
Q

This is

A
47
Q

What is D/S

A

Distance / spot ratio for pyrometer

48
Q

What is D/S (pyrometer)

A

Distance / spot ratio for pyrometer

2nd Year Instrumentation (8 decks)

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