Process Equipment and Plant Design
Log mean temperature difference in case of multi-pass shell and tube heat exchanger is always

Both B & C
More than geometric mean value
More than arithmetic mean value
Less than arithmetic mean value

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Process Equipment and Plant Design
Which of the following is not a valid assumption in continuous binary distillation for calculating the number of equilibrium stages by Mc-Cabe-Thiele's method?

Sensible heat changes for vapour & liquid are negligibly small
Molar latent heat of the two components are equal
Heat of mixing of normal liquid is assumed to be zero
Reflux is not a saturated liquid

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Process Equipment and Plant Design
In a vertical short tube evaporator (Calendria type), the

Liquor is inside the tube while the steam is outside the tube
Tube dia of 2.5-7.5 cms, tube length of 75-200 cms and cylinderical drum dia of 1-6 metres are normally used
All of these
Area of central downtake is equal to 40 to 100% of total cross-sectional area of the surrounding tube

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