A copper constantan thermocouple of wire diameter each of 0.25 mm is used for measuring the temperature of a surface which is convectively heated by a fluid at 200 C with a heat transfer coefficient of 100 W/mK. The area of the surface exposed to the fluid is 10 cm. The thermocouple has an insulation layer and its cross-section size is 5 mm x 2.5 mm. The thermal conductivity of the insulation is 1 W/mK. The thermocouple is exposed to an ambient at a temperature of 30 C subject to a heat transfer coefficient of 5 W/mK. Take thermal conductivity of copper as 386 W/mC and the thermal conductivity of constantan as 22.7 W/mC. 37. The effective thermal conductivity area product (kA) for the thermocouple pair is (a) 1.0x10-5 Wm/C (b) 1.0x10-5 W/mC (c) 2.0105 Wm/C 38. The radius of the single wire equivalent is (a) 0.25 mm (b) 0.177 mm 41. The fin parameter (a) 33.0 m- (c) 0.125 mm 39. The outer radius of effective insulation layer in the single wire model is (a) 1.875 mm (b) 2.5 mm (c) 3.75 mm m hoverall P (b) 330 m-1 Area, S is calculated as 40. The heat loss from the equivalent wire to the ambient is modeled as that due to an overall heat transfer coefficient given by (a) 105 W/mK (b) 100 W/mK (c) 25 W/mK (d) 4.9 W/mK (c) 16.5 m hr, Tr 43. The thermocouple error due to convection and conduction loss is (a) -1 C (b) -3 C (c) -5 C (d) 2.0x10-5 W/mC (d) 0.50 mm h, Tamb (d) 7.5 mm (d) 165 m- 42. Assuming the thermocouple wire to be very long, the surface temperature is calculated as (a) 199 C (b) 197 C (c) 195 C (d) 202 C (d) 2 C 44. If the surface S faces a block surface at a temperature of 150 C, the temperature measured by the thermocouple as compared to the case of neglecting radiation loss will be (a) Lower (b) Higher (c) No change