The calibration data of a thermocouple with its cold junction at 0°C are given below. The hot junction of the thermocouple is placed in a bath at 80°C, while its cold junction is at 20°C. What is the emf of thermocouple ?

Related Mcqs:

1. Emf developed by a thermocouple while measuring a temperature of 800°C is about 31 mV. The type of thermocouple used is________________?

   A. Chromel-alumel
   B. Iron-constantan
   C. Platinum-platinum + rhodium
   D. None of these

2. Emf developed by a thermocouple while measuring a temperature of 400°C is 22 mV. The type of thermocouple used is ___________________?

   A. Chromel-alumel
   B. Iron-constantan
   C. Platinum-rhodium
   D. Platinum-platinum + rhodium

3. Emf developed by a thermocouple, while measuring a temperature of 600°C is about 5.5 mV. The type of thermocouple used is_______________?

   A. Chromel-alumel
   B. Iron-constantan
   C. Platinum-platinum + rhodium
   D. Either A., B. or C.

4. Which of the following thermocouples will give the highest output for the same value of hot and cold junction temperature ?

   A. Platinum-platinum + rhodium
   B. Iron-constantan
   C. Chromel-constantan
   D. All will give the same output

5. Emf generated in a thermocouple depends on the temperature ___________________?

   A. Of cold junction only
   B. Of hot junction only
   C. Difference between hot and cold junctions
   D. Difference between cold junction and atmospheric temperature

6. Relationship between absorption/evolution of heat at the thermocouple junctions and the current flow in the circuit is given by _____________ effect?

   A. Peltier
   B. Thomson
   C. Seebeck
   D. None of these

7. Which of the following thermocouple materials does not contain nickel ?

   A. Alumel
   B. Chromel
   C. Constantan
   D. None of these

8. The maximum service temperature for fibre glass used as thermocouple wire insulation material is __________ °C?

   A. 250
   B. 500
   C. 750

   D. 1000

9. Which thermocouple can be used to measure a temperature of around 1400°C ?

   A. Copper-constantan
   B. Aluminium-Chromel
   C. Platinum-platinum + rhodium
   D. None of these

10. Thermocouple is suitable for measuring_________________?

    A. Liquid temperatures only
    B. Very high temperatures only
    C. Very low temperatures only
    D. Both high and low temperatures