اخي طارق الف شكر على طرح الكتاب ولكن لدي سؤالين في ماده القياسات ارجوا مسساعدتي ولك خالص الشكر والعرفان
1- A thermocouple, which responds as first order instrument . has a time Constant of 20 ms, Determine its 90% rise time.
2-A liquid in glass thermometer is initially at 20oC, then suddenly subjected to a surrounding temperature of 200oC. the thermometer indicates a temperature of 100oC after a time interval of 5 sec.
Calculate the thermometer time constant and the time interval for the thermometer to read 99% of the surrounding temperature