Q. What is the geometric mean of two heat transfer areas A1 and A2 ?

View solution

Q. Hot water (0.01 m³ /min) enters the tube side of a counter current shell and tube heat exchanger at 80°C and leaves at 50°C. Cold oil (0.05 m³/min) of density 800 kg/m³ and specific heat of 2 kJ/kg.K enters at 20°C. The log mean temperature difference in °C is approximately

View solution

Q. In a heat exchanger, floating head is provided to

View solution

Q. Leidenfrost point is a term concerned with the

View solution

Q. A process stream of dilute aqueous solution flowing at the rate of10 Kg.s⁻¹ is to be heated. Steam condensate at 95°C is available for heating purpose, also at a rate of 10 Kg.s⁻¹. A 1 - 1 shell and tube heat exchanger is available. The best arrangement is

View solution

Q. Heat produced when a steady state current, I passes through an electrical conductor having resistance, 'R' is

View solution

Q. Kirchoff s law applies to __________ radiation.

View solution

Q. With the increase of temperature, the Col-burn jH factor

View solution

Q. In case of evaporators, liquid entrainment results primarily due to

View solution

Q. Baffles in the shell side of a shell and tube heat exchanger

View solution

Q. Air is to be heated by condensing steam. Two heat exchangers are available (i) a shell and tube heat exchanger and (ii) a finned tube heat exchanger. Tube side heat transfer area are equal in both the cases. The recommended arrangement is

View solution

Q. The unit of heat transfer co-efficient in SI unit is

View solution

Q. The number of kg vaporised per kg of steam fed to the evaporator is defined as

View solution

Q. Pick out the wrong statement.

View solution

Q. Economy of a multiple effect evaporator is not influenced much by the

View solution

Q. Increasing the liquor level in the evaporator results in the

View solution

Q. Pick out the wrong statement.

View solution

Q. Convective heat transfer co-efficient in case of fluid flowing in tubes is not affected by the tube length/diameter ratio, if the flow is in the __________ zone.

View solution

Q. The actual temperature drop across the heating surface in an evaporator depends on the

View solution

Q. Which of the following is not used as a medium for high temperature heating ?

View solution