Correct use of 'factor of safety' is very important in equipment design. It is defined as the ratio of the

Width and depth of grooves in the tube sheet holes normally are __________ inch respectively.

A. $$\frac{1}{8}$$ and $$\frac{1}{{64}}$$

B. $$\frac{1}{{64}}$$ and $$\frac{1}{8}$$

C. $$\frac{1}{2}$$ and 8

D. $$\frac{1}{2}$$ and 5

In most of the shell and tube heat exchangers, the tube pitch is generally __________ the tube diameter.

A. Less than

B. 1.25-1.50 times

C. 2.5 times

D. One-fourth of

Value of Peclet number = 0, is the representative of

A. Laminar flow

B. Complete back mixing

C. Plug flow

D. Eddy diffusivity = 0

The ideal size of round bubble caps to be used in industrial distillation column having a diameter of 3-6 metres is __________ cms.

A. 5

B. 15

C. 7.5

D. 50