The initial temperature of machine is 45°C. Calculate the temperature of machine after 1.2 hours, if its final steady temperature rise is 85° C and the heating time constant is 2.4 hours. Consider ambient temperature as 25° C.

The initial temperature of machine is 45°C. Calculate the temperature

1.	The initial temperature of machine is 45°C. Calculate the temperature of machine after 1.2 hours, if its final steady temperature rise is 85° C and the heating time constant is 2.4 hours. Consider ambient temperature as 25° C.
A.	(85 – 25 e-0.5)° C
B.	(25 – 65 e-0.5)° C
C.	(110 – 65 e-0.5)° C
D.	(85 – 65 e-0.5)° C
Answer» E.