A shell may by termed as thin if its thickness to diameter ratio is less than 0.1. The factor which can be neglected in the calculation of membrane stresses is________________?

A. Decreases with increase in gas flow rate
B. Is inversely proportional to the mass of the dust particle
C. Is directly proportional to the radius of the dust particle path
D. None of these

A. 0.1
B. 0.8
C. 0.25
D. 0.5

A. 1/10-1/15th
B. 1/5-1/10th
C. 1/20-1/30th
D. 1/2 to 1/4th

A. To increase the residence time of shell side fluid
B. To provide support to the tube bundle
C. To reduce the induced vibration in the tubes
D. To increase the tube side heat transfer co-efficient by inducing turbulence

A. It is unsuitable for concentrating those liquids, which form a scale or deposit salt
B. It is suitable for process, in which the final product is a liquor instead of solid
C. Its usual dimensions are: tube dia = 2-3 cms; evaporator body dia = 1-4 metres and evaporator
height = 2.5-4 metres
D. Liquor flows inside the tube, while the steam is outside submerging the tube

A. 2.5-3.0
B. 5-7.5
C. 10-12.5
D. 15-20