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A thermocouple is suddenly immersed in a medium of high temperature. The approximate time taken by the thermocouple to reach 98% of the steady-state value is (2002)
  • a)
    equal to the time constant of the thermocouple
  • b)
    equal to twice the value of the time constant of the thermocouple
  • c)
    equivalent to four times the value of the time constant of the thermocouple
  • d)
    independent of the time constant
Correct answer is option 'C'. Can you explain this answer?
Verified Answer
A thermocouple is suddenly immersed in a medium of high temperature. ...
The output at line t
c (t) = c0 (1 - e-t/T)
For, c (t) = 0.98 C0
we have, 0.98 C0 = C0 (1 - e-t/T)
or t ≈ 4 T
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A thermocouple is suddenly immersed in a medium of high temperature. The approximate time taken by the thermocouple to reach 98% of the steady-state value is (2002)a)equal to the time constant of the thermocoupleb)equal to twice the value of the time constant of the thermocouplec)equivalent to four times the value of the time constant of the thermocoupled)independent of the time constantCorrect answer is option 'C'. Can you explain this answer?
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