Heat Transfer Mock Test 9

1. What is the symbol used for dynamic viscosity?

2. What is the maximum efficiency for parallel flow heat exchanger?

3. A flat plate was positioned at zero incidence in a uniform flow stream of air. Assuming boundary layer to be turbulent over the entire plate, workout the ratio of skin-friction forces on the front and rear half part of the plate

4. What is the symbol used for specific heat?

5. For laminar film condensation on a vertical plate, the gravitational acceleration g is replaced by

6. What is the symbol used for thermal conductivity?

7. A cold fluid (specific heat 2.95 k J/kg K) at 10 kg/min is to be heated from 25 degree Celsius to 55 degree Celsius in a heat exchanger. The task is accomplished by extracting heat from hot water (specific heat 4.186 k J /kg K) available at mass flow rate 5 kg/min and inlet temperature 85 degree Celsius. Identify the type of arrangement of the heat exchanger

8. The velocity profile of the hydrodynamic boundary layer is dependent upon

9. A plate condenser of dimensions l * b has been designed to be kept with side l in the vertical position. However due to oversight during erection and installation, it was fixed with side b vertical. How would this affect the heat transfer? Assume laminar conditions and same thermos-physical properties and take b = l/2

10. The critical Reynolds number for transition from laminar to turbulent film condensation is