Heat Transfer For a given ambient air temperature with increase in the thickness of insulation of a hot cylinderical pipe, the rate of heat loss from the surface would Increase First increase and then decrease Decrease First decrease and then increase Increase First increase and then decrease Decrease First decrease and then increase ANSWER DOWNLOAD EXAMIANS APP
Heat Transfer The critical radius 'r' of insulation on a pipe is given by r = k/h r = 2k/h r = h/k r = k/2h r = k/h r = 2k/h r = h/k r = k/2h ANSWER DOWNLOAD EXAMIANS APP
Heat Transfer In Joule's experiment, an insulated container contains 20 kg of water initially at 25°C. It is stirred by an agitator, which is made to turn by a slowly falling body weighing 40 kg through a height of 4 m. The process is repeated 500 times. The acceleration due to gravity is 9.8 ms⁻². Neglecting the heat capacity of agitator, the temperature of water (in °C) is 25 34.4 26.8 40.5 25 34.4 26.8 40.5 ANSWER DOWNLOAD EXAMIANS APP
Heat Transfer A long iron rod initially at a temperature of 20°C has one end dipped in boiling water (100°C) at time, t = 0. The curved surface of the rod is insulated so that heat conduction is one dimensional in the axial direction. The temperature at a distance 100 mm from the dipped end becomes 40°C at time, t = 200 s. The same temperature is achieved at a distance of 200 mm from the dipped end at time t = 356 s t = 400 s t = 283 s t = 800 s t = 356 s t = 400 s t = 283 s t = 800 s ANSWER DOWNLOAD EXAMIANS APP
Heat Transfer Indirect contact heat exchangers are preferred over direct contact heat exchangers, because Heat transfer co-efficient are high There is no risk of contamination There is no mist formation Cost of equipment is lower Heat transfer co-efficient are high There is no risk of contamination There is no mist formation Cost of equipment is lower ANSWER DOWNLOAD EXAMIANS APP
Heat Transfer What is the emissivity of a black body? 0.5 0.9 1 0.5 0.9 1 ANSWER DOWNLOAD EXAMIANS APP
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