List of top Mechanical Engineering Questions on Heat Transfer asked in TS PGECET

For flow over a flat plate, the hydrodynamic boundary layer thickness is 0.5 mm. If the dynamic viscosity is $ 25 \times 10^{-16} \, \text{Pa-s} $, specific heat is 2000 J/kg·K, and the thermal conductivity is 0.05 W/m·K, then what would be the thermal boundary layer thickness?
A heat exchanger has been designed with heat transfer surface area of ‘A’ and overall heat transfer coefficient ‘U’, handling two different fluids of heat capacities $ C_{\text{min}} $ and $ C_{\text{max}} $. The parameter NTU used in the analysis of heat exchanger is specified as:
Liquid is flowing through two pipes having the same dimensions and same material. If the ratio of velocities are 2:3, with all other factors remaining same, the ratio of loss of head due to friction is