What is the normal percentage of rhodium in platinum + rhodium element used in the thermocouple ?

Related Mcqs:

1. 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...

2. 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...

3. 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...

4. 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....

5. Platinum resistance thermometer can be used upto antimony point which is ____________ °C, and is the temperature of equilibrium between solid antimony & liquid antimony at normal atmospheric pressure?

   A. 961.93 B. 630.74 C. 1064.43 D. 1261.93...

6. The frequency response of a dynamic element shows a constant magnitude ratio at all frequencies. The element exhibits a negative phase shift at all frequencies. The absolute value of the phase shift increases linearly with frequency. The element has the transfer function ?

   A. e-ηS B. (T1S + 1)/(T2S + 1) C. (T1S/(T2S + 1) D. (T1S + 1)/(T2S...

7. 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...

8. Platinum resistance thermometer is the international standard for temperature measurement between __________________?

   A. Triple point of hydrogen and freezing point of antimony B. 13.81°K to 903.9°K C. Both A. and B. D. Neither A. nor B....

9. With increase in temperature, the electrical conductivity of the platinum used in the resistance thermometer ?

   A. Increases B. Decreases C. Remain constant D. Increases exponentially...

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

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