Heat Transfer MCQ Questions & Answers | Chemical Engineering

Which of the following is not concerned with the heat transfer?

1000 Kg of liquid at 30°C in a well stirred vessel has to be heated to 120°C, using immersed coils carrying condensing steam at 150°C. The area of the steam coils is 1.2 m² and the overall heat transfer co-efficient to the liquid is 1500 W/m².°C. Assuming negligible heat loss to the surrounding and specific heat capacity of the liquid to be 4 kJ/kg.°C, the time taken for the liquid to reach desired temperature will be

A cube, sphere & a thin circular plate (all having same mass and made of same material) are all heated to 300°C and allowed to cool in natural air. Which one will cool the slowest ?

Choose the correct equation.

Fouling factor for a heat exchanger is given by (where, U₁ = heat transfer co-efficient of dirty surface U₂ = heat transfer co-efficient of clean surface)

A backward feed multiple effect evaporator is better than forward feed for concentrating cold feed, because it provides

Pick out the wrong statement.

Film boiling is usually not desired in commercial equipments, because

Natural convection is characterised by

Absorptivity and refletivity of a perfect black body are respectively