‚Äö√Ñ√∂‚àö√ë‚àö‚à´Thermal radiation suffers no attenuation in a vacuum‚Äö√Ñ√∂‚àö√ë‚àöœÄ.$

‚Äö√Ñ√∂‚àö√ë‚àö‚à´Thermal radiation suffers

1.	‚Äö√Ñ√∂‚àö√ë‚àö‚à´Thermal radiation suffers no attenuation in a vacuum‚Äö√Ñ√∂‚àö√ë‚àöœÄ.$
A.	True
B.	False
Answer» B. False

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A mercury thermometer with bulb idealized as a sphere of 1 mm radius is used for measuring the temperature of fluid whose temperature is varying at a fast rate. For mercury If the time for the temperature change of the fluid is 3 second, what should be the radius of thermocouple to read the temperature of the fluid?For the thermocouple materialk = 100 W/m Kα = 0.0012 m2/sh = 18 W/m2 K
An iron billet (k = 65 W/m K) measuring 20 * 15 * 80 cm is exposed to a convective flow resulting in convection coefficient of 11.5 W/m2 K. Determine the Biot number
“Thermal radiation suffers no attenuation in a vacuum”.
A low value of time constant can be achieved for a thermocouple by(i) Increasing the wire diameter(ii) Increasing the value heat transfer coefficient(iii) Use light metals of low density and low specific heat
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 junction diameter needed for the thermocouple to have thermal time constant of one second. 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
An iron billet (k = 65 W/m K) measuring 20 * 15 * 80 cm is exposed to a convective flow resulting in convection coefficient of 11.5 W/m<sup>2</sup> K. Determine the Biot numbe?
The lumped parameter solution for transient conduction can be conveniently stated as
How does the body temperature falls or rises with time?
‚Äö√Ñ√∂‚àö√ë‚àö‚à´Thermal radiation suffers no attenuation in a vacuum‚Äö√Ñ√∂‚àö√ë‚àöœÄ.$
Which of the following has units of time constant? (Where, P is density, A is area, c is specific heat and V is volume)

‚Äö√Ñ√∂‚àö√ë‚àö‚à´Thermal radiation suffers no attenuation in a vacuum‚Äö√Ñ√∂‚àö√ë‚àöœÄ.$

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