A. Alumel
B. Chromel
C. Constantan
D. None of these
Related Mcqs:
- 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 - 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 - 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 - 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 - 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. - Out of the following thermocouple wire insulating material, the highest temperature rating is for________________?
A. Teflon
B. Ceramic fibre
C. Asbestos
D. Fibre glass - Which of the following relates the absorption & evolution of heat at the junctions of a thermocouple to the current flow in the circuit ?
A. Seebeck effect
B. Peltier effect
C. Joule heating effect
D. Thomson effect - 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 - 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 - What is the normal percentage of rhodium in platinum + rhodium element used in the thermocouple ?
A. 0.1
B. 3
C. 13
D. 29
