An electrical resistance heater is placed inside a hollow cylinder. The heater has a surface temperature of 500°F, while the inside of the cylinder is maintained at 80°F. If the surface area of the heater is 1.25 ft2, and the emissivity of the heater is 0.90, what is the net rate of radiation heat transfer from the heater?
Given: Ts = 500°F = 960 R; Tsurr = 80°F = 540 R; A = 1.25 ft2; ?= 0.90
What will be an ideal response?
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What will be an ideal response?
The subsequent problems deal with the figure and table below
For a Type J (Iron-Constantan) thermocouple configuration (as shown above) with a 0°C reference (Tref):
where Vemf is the voltage difference produced by the junction pair (Vemf = VA ? VB in the figure).Assume that nodes A and B are at the same temperature, unless indicated otherwise. Assume that the op amp is ideal.If we measure a 20°C input with a 10°C reference, the voltage between nodes A and B would be?
A. 1.526 mV B. 0.507 mV C. 0 mV D. 1.019 mV E. 0.512 mV