Athermocouple used to measure temperature of gas flowing through a duct records 280°c. if emissivity of junction is 0.4 and film coefficient of heat transfer is 150w/m^2k. (i) find the true temperature of gas. (ii what should be the emissivity of junction in order to reduce the temperature error be 40%? the temperature of the duct wall is 140°c

Line joining liquid phase with liquid and solid phase mixture is known as: a) liquidus b) solidus c) tie line d) none of the mentioned

Ariver flows from north to south at 8 km/h. a boat is to cross this river from west to east at a speed of 20 km/h (speed of the boat with respect to the earth/ground). at what angle (in degrees) must the boat be pointed upstream such that it will proceed directly across the river (hint: find the speed of the boat with respect to water/river)? a 288 b. 21.8 c. 326 d. 30.2

Thermal stresses are developed in a metal when its a) initial temperature is changed b) final temperature is changed c) density is changed d) thermal deformation is prevented e) expansion is prevented f) contraction is prevented