310201c Thermocouples

Question 1

What are the three most common types of thermocouples

Answer 1

1. Type J
2. Type K
3. Type T

Question 2

What is the color coding for the negative conductor in all thermocouples?

Answer 2

The color coding for negative conductors in a thermocouple is always RED

Question 3

Name the two metals used to construct type K thermocouples

Answer 3

Chromel (+)
Alumel (-)

Question 4

Name the two metals used to construct type J thermocouples

Answer 4

Iron (+)
Constantan (-)

Question 5

Name the two metals used to construct type T thermocouples

Answer 5

Copper (+)
Constantan (-)

Question 6

What is the overall jacket wire color for a type J thermocouple

Answer 6

Type J thermocouple = black

Question 7

What is the overall jacket wire color for a type K thermocouple

Answer 7

Type K thermocouple = yellow

Question 8

The ______ ______ describes the redistribution of electrons when one end of a conductor is heated

Answer 8

The seed back effect describes the redistribution of electrons when one end of a conductor is heated

Question 9

Which thermocouple provides the most linear response to a change in temperature?

Answer 9

Type K Thermocouple

Question 10

Define the law of intermediate metals

Answer 10

The introduction of a third medal into the circuit has no effect upon the output voltage generated if the junctions created by the third metal are the same temperature

Question 11

Y is solving for temperatures using thermocouple tables more accurate than using Seebeek coefficient?

Answer 11

The non-linearity of the temperature voltage-relationship causes the Seebeek coefficient to change.
Thermocouple tables are adjusted for nonlinearity.