Which of the following thermocouple materials does not contain nickel?

Nickel percentage in invar which is an iron-nickel alloy, and is used as a thermocouple material is

A

12

B

36

C

54

D

68

Invar tapes used for measuring base lines, is made of nickel-iron alloy containing nickel

A

24 %

B

36 %

C

40 %

D

60 %

Which of the following alloys does not contain nickel?

A

Chlorinet - 2 alloy

B

Monel

C

Inconel

D

Babbit metal

The active materials of a nickel-iron battery are

A

nickel hydroxide

B

powdered iron and its oxide

C

21% solution of kOH

D

all of the above

Materials used for making permanent magnets containing iron and nickel are made by __________ technique.

A

Powder metallurgy

B

Casting

C

Forging

D

None of these

The thermocouple instruments do not have

A

High sensitivity

B

Absence of frequency error

C

Independence of ambient temperature

D

High degree of measuring accuracy

Out of the following, the highest emf for a given temperature is generated by the __________ thermocouple.

A

Chromel - alumel

B

Iron - constantan

C

Platinum - platinum + rhodium

D

Copper-constantan

The output of a thermocouple is:

A

a capacitance

B

a resistance

C

a current

D

a voltage

E

None of the above

The thermocouple instrument will measure

A

Current

B

Voltage

C

Flux

D

None of the above

The time constant of a thermocouple is

A

The time taken to attain the final temperature to be measured

B

The time taken to attain 50% of the value of initial temperature difference

C

The time taken to attain 63.2% of the value of initial temperature difference

D

Determined by the time taken to reach 100°C from 0°C

Which of the following thermocouple materials does not contain nickel?

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