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posted by  MOKR on 8/1/2008 12:17:48 PM  |  status: Live  

Measurements

Course Textbook Chapter Problem
N/A Experimental Methods for Engineers, JP Holman, 7th Edition, TATA McGraw -Hill 2 2.5
Question Details:
A thermometer is initially at a temperature of 70 0F and is suddenly placed in a liquid which is maintained at 300 0F. The thermometer indicates 200 and 2700F after time intervals of 3 and 5 s, respectively, estimate the time constant for the thermometer

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posted by bradely(SME Mechan on 8/7/2008 11:35:38 PM  |  status: Live
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MOKR's comment:
"Excellent- Thanks for the answer"
Response Details:
Ta=3000F
T=2000F
T1=700F
T2=2700F
ΔT=270-70=2000F
Δt=5-3=2s
time comstant,τ = (Ta-T)(Δt)/ΔT
τ = (300-200)(2)/200
  =1
 
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