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

Related Mcqs:

1. 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

2. 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.

3. 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 ?

   A. 3.26 mv
   B. 0.80 mv
   C. 2.46 mv
   D. 2.43 mv

4. 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

5. Ordinary mercury in glass thermometer is used for measuring temperature upto 120°C. However, for measuring higher temperature upto __________ °C, thermometer is made by filling nitrogen under pressure above the mercury, which stops the evaporation of mercury and reduces the chance of broken thread of mercury?

   A. 250
   B. 350
   C. 550
   D. 700

6. Operating range of a temperature measuring instrument is 800 to 1600°C. It could be a/an _____________ pyrometer?

   A. Radiation
   B. Optical
   C. Photoelectric
   D. None of these

7. Which of the following is not suitable for measuring the temperature of a red hot object in the range of 800 – 1600°C ?

   A. Optical pyrometer
   B. Radiation pyrometer
   C. Photoelectric pyrometer
   D. Thermocouples

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. The temperature of tempering oil baths maintained at 400°C during heat treatment of steel is measured by a/an _____________ thermocouple?

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

10. 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