__________ is not used as a material of construction in thermocouples.

__________ is undesirable in thermocouples used in industries,

A

Linear relation of emf to temperature

B

Corrosion resistance

C

Oxidation resistance

D

Non-linear relation of emf to temperature

Thermal well made of __________ gives the fastest speed of response, while measuring temperature by thermocouples.

A

Steel

B

Vycor (a glass)

C

Nichrome

D

Inconel

Thermocouples are mainly used for the measurement of

A

Temperature

B

Resistance

C

Eddy currents

D

Coupling co-efficient

In thermocouples which of the following pairs is commonly used ?

A

Copper-constantan

B

Aluminium-tin

C

Silver-German silver

D

Iron-steel

All the thermocouples used for temperature measurement use dissimilar metal

A

Strips

B

Bars

C

Wires

D

Beads

Constantan an alloy used in thermocouples is an alloy of

A

Copper and tin

B

Copper and zinc

C

Copper and iron

D

Copper and nickel

Constantan used in thermocouples is an alloy of

A

Iron & copper

B

Copper & aluminium

C

Lead & tin

D

None of these

Invar used in thermocouples is an alloy of nickel and

A

Iron

B

Copper

C

Chromium

D

Lead

For platinum thermocouples, lead wires are made of

A

Copper & copper-nickel alloys

B

Copper & iron

C

Iron & nickel

D

Tin & nickel

Which of the following thermocouples has the widest temperature measurement range?

A

Iron-constantan

B

Chromel-alumel

C

Copper-constantan

D

Platinum-platinum/rhodium

__________ is not used as a material of construction in thermocouples.

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