MCQOPTIONS
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| 1. |
The following data pertains to the junction of a thermocouple wire used to measure the temperature of the gas stream.Density = 8500 kg/m3, specific heat = 325 J/kg K, thermal conductivity = 40 W/m K and the heat transfer coefficient between the junction and gas = 215 W/m2 K. |
| A. | nIf thermocouple junction can be approximated as 1 mm diameter sphere, determine how long it will take for the thermocouple to read 99% of the initial temperature difference |
| B. | 9.86 seconds |
| C. | 8.86 seconds |
| D. | 7.86 seconds |
| E. | 6.86 seconds |
| Answer» B. 9.86 seconds | |