A thermocouple junction of spherical form is to be used to measure the temperature of the gas stream. The junction is at 20 degree Celsius and is placed in a gas stream which is at 200 degree Celsius. Make calculations for time required by the thermocouple to reach 197 degree Celsius temperature. Assume the thermos-physical properties as given belowk = 20 W/ m Kh = 350 W/m² Kc = 0.4 k J/kg Kp = 8000 kg/m³

A thermocouple junction of spherical form is to be used to measure the

1.	A thermocouple junction of spherical form is to be used to measure the temperature of the gas stream. The junction is at 20 degree Celsius and is placed in a gas stream which is at 200 degree Celsius. Make calculations for time required by the thermocouple to reach 197 degree Celsius temperature. Assume the thermos-physical properties as given belowk = 20 W/ m Kh = 350 W/m² Kc = 0.4 k J/kg Kp = 8000 kg/m³
A.	1.094 seconds
B.	2.094 seconds
C.	3.094 seconds
D.	4.094 seconds
Answer» E.