Chemical Heat Transfer

Removal of ______________ heat is involved in the condensation of a vapor under saturated conditions? A. SuperB. Sensible C. Latent D. Both B. & C.

The energy radiated from a surface Q at absolute temperature T is related as__________________? A. Q ∝ T2B. Q ∝ T4 C. Q ∝ T3 D. None of these

Absorptivity of a perfect black body is unity. Which of the following has maximum absorptivity ? A. Aluminium foil B. Refractory bricks C. Iron plateD. Coke breeze

Crystallisation of solids from a homogeneous solution is a/an ______________ process? A. Exothermic B. Mildly endothermic C. Highly endothermic D. None of these

Steam condensate is recovered by steam traps and recycled for use as boiler feed water, because of its low___________________? A. Hardness B. Dissolved solids content C. Suspended solids contentD. All A., B. and C.

_______________ paint has the maximum absorption coefficient ? A. Black B. Yellow C. White D. Grey

Baffles are provided in heat exchangers to increase the________________? A. Fouling factor B. Heat transfer areaC. Heat transfer co-efficient D. Heat transfer rate

Prandtl and Reynold’s analogies are identical for Prandtl number value of__________________? A. 0 B. 0.5C. 1 D. 5

The rate of heat transfer through a pipe wall is given by, q = 2π k (Ti – T0)/ln (ri/r0). For cylinder of very thin wall, q can be approximated by__________________? A. q = [2π k (Ti + T0)/2]/ln (ri/r0) B. q = 2π ri k (Ti – T0)/(r0/ri) C. q = 2π k (Ti…

If a single tube pass heat exchanger is converted to two pass, then for the same flow rate, the pressure drop per unit length in tube side will ________________? A. Increase by 1.8 times B. Decrease by 22C. Increase by 216 D. Remain unchanged