Kafli 3 - Temperature Flashcards

1
Q

Hvernig finnur þú F°?

A

F° = 1.8 * C° + 32

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2
Q

Hvernig finnur þú K°?

A

K° = C° + 273

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3
Q

What kind of power (t.d. battery, ac, dc) þarf “thermocouple”?

A

Needs no power.

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4
Q

Hvaða græja hefur þessa lýsingu: “consists of a junction of two dissimilar metals” ?

A

Thermocouple

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5
Q

Hvaða skala í gráðum mælir thermocouple?

A

-200°C - 2000°C.

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6
Q

Við hvaða græju á eftirfarandi formúla við: E = K * Th

A

Thermocouple

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7
Q

Hvernig virkar thermocouple

A

Basicly two metals sem eru saman, einn er í kuldanum og hinn í hitanum, það myndast mismunur á hita (þar með leiðni) og skilast niðurstaðan því í myndum EMF

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8
Q

Hvort verður cold eða hot junction í thermocopule að vera constant?

A

Cold junction verður að vera constant.

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9
Q

Hvernig hitamælar eru notaðir í transport category airplanes?

A

Resistance thermometers og thermocouple thermometers.

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10
Q

Hvernig hitamælir myndir þú nota til að mæla mjög há hitastig?

A

Thermocouple

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11
Q

Af hverju viltu hafa iron og brass í bimetallic thermometers?

a) two different coefficients of linear expansion
b) two different electrical resistances when temperature changes

A

a) two different coefficients of linear expansion

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12
Q

Flying at high speed and high altitude, the difference between ram air temperature and static air temperature is:

a. Due to adiabatic cooling
b. Due to adiabatic compression warming
c. Proportional to the square of the absolute temperature
d. Likely to be less than when flying low and slow

A

b. Due to adiabatic compression warming

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13
Q

Total air temperature is:

a. The maximum temperature attainable by the air when brought to rest, adiabatically
b. The static air temperature minus the recovery factor
c. The temperature indicated on the air temperature thermometer plus the ram rise
d. The recovery factor plus the ram rise

A

a. The maximum temperature attainable by the air when brought to rest, adiabatically

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