Chemical Engineering Archives

4041. Normally, the plate thickness of the bottoms and roofs of vertically cylindrical storage vessels as compared to that of the cylindrical shell is

less

same

more or less depending upon the pressure & temperature inside the vessel and the nature of the fluid contained therein.

✅ The correct answer is option B.

4042. Hoop (circumferential) stress induced in a thin walled ‘Horton Sphere’ used for the storage of liquid ammonia under pressure is

✅ The correct answer is option A.

4043. For a given fluid, as the pipe diameter increases, the pumping cost

decreases.

increases.

remains unaffected.

may increase or decreaes depending upon whether the fluid is Newtonian or non-Newtonion.

✅ The correct answer is option A.

4044. Ponchon Savarit method is based on the use of enthalpy concentration diagram, which contains the bubble point curve (saturated liquid curve), dew point curve (saturated vapour curve) and equilibrium tie lines. As compared to McCabe-Thiele’s method, this method

is more accurate in finding the number of equilibrium stages.

accounts for the enthalpy changes in the process.

facilitates direct calculation of heat load on reboiler & condenser from, the diagram used in this method.

all ‘a’, ‘b’ & ‘c’.

✅ The correct answer is option D.

4045. Baffles are provided in a shell and tube heat exchanger to increase the turbulence and velocity of the shell side fluid. Which of the following shaped baffles does not fall in the category of transverse baffle ?

Segmental baffle

Flat plate extending across the wall

Disk type baffle

Helical type baffle

✅ The correct answer is option B.

4046. With increase in the reflux ratio for a fixed production from a continuous binary distillation column, the __________ decreases.

fixed charges initially

running cost of cooling water for condenser

vapour & liquid load both

running cost of steam for reboiler

✅ The correct answer is option A.

4047. Maximum size of the raschig rings used in a packed tower is about __________ of the coloumn diameter.

1/10th

1/20th

1/30th

1/50th

✅ The correct answer is option C.

4048. The ratio of the largest load in a test to the original cross-sectional area of the test specimen is called the __________ stress.

yield point

breaking

ultimate

none of these

✅ The correct answer is option C.

4049. Factor of safety (i.e., overdesign factor) in heat transfer equipments is about __________ percent more than the actual/theoretical design factor.

5-Oct

15-20

30-35

35-40

✅ The correct answer is option B.

4050. A stuffing box is used for

absorbing the contraction/expansion of pipeline due to temperature changes.

prevention of fluid leakage around moving parts.

facilitating smooth opening and closing of a valve.

reducing the resistance of fluid flow.

✅ The correct answer is option B.