A. Heat transfer by radiation cannot occur across an absolute volume
B. In case of a shell and tube heat exchanger, the pressure drop through the shell is proportional to the number of times the fluid crosses the bundle between baffles
C. Propagation velocity for travel of heat radiation through vacuum is equal to the velocity of the light
D. The amount of heat involved in the condensation or vaporisation of 1 kg of a fluid is the same
Chemical Heat Transfer
Chemical Heat Transfer
A. Rate = Driving force × Resistance
B. Driving force = Rate × Resistance
C. Resistance = Driving force × Rate
D. Rate = Resistance/Driving force
A. Superheated steam is preferably not used for process heating because of its low heat transfer film co-efficient
B. In a shell and tube heat exchanger, the shell pressure drop is maximum for orifice baffles
C. S.I. unit of fouling factor is Watt/m2.°K
D. Longitudinal fins are used in extended surface heat exchangers, when the direction of fluid flow is parallel to the axis of the tube
A. In case of heat transfer by purely forced convection, GR/Re 2 ≤ 1
B. The equivalent diameter of heat transfer for a duct of square cross-section (having each side as
‘x’) is equal to 4x
C. Distillation process is not the same as evaporation
D. The effectiveness of nucleate boiling depends basically on the ease with which the bubbles are
formed and detached from the heating surface
A. The capacity of an evaporator is reduced by the boiling point elevation
B. Corrosive liquid is normally passed through the tubes in a shell and tube heat exchanger
C. Steam jet ejector is used for vapor compression in a thermal recompression evaporator
D. Heat sensitive materials should be concentrated in high pressure evaporators
A. Higher economy
B. Lower capacity
C. Both A. & B.
D. Lower economy
A. Forward
B. Backward
C. Parallel
D. None of these
A. 15 min
B. 22 min
C. 44 min
D. 51 min
A. Cannot pass through vacuum
B. Travel in straight line
C. Can be reflected by a mirror
D. Both B. and C.
A. Increase
B. Decrease
C. Not affect
D. Increase the condensing film co-efficient as well as
