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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.

4021. Which of the following is not a graphical method (but is an analytical method) for the calculation of theoretical number of stages in case of continuous binary distillation?

Sorel-Lewis method.

McCabe-Thiele’s method.

Ponchon-Savarit method.

none of these.

✅ The correct answer is option A.

4026. Normal screwed fittings are used for pipes upto a diameter of __________ inches.

1.5

✅ The correct answer is option B.

4031. In a multipass shell and tube heat exchanger, the shell side cross flow area does not depend upon

baffle spacing

clearance

pitch

none of these

✅ The correct answer is option D.

4036. Which of the following material is seldom used for pressure vessel construction ?

Rimmed still

Mild steel

Killed steel

Semi-killed steel

✅ The correct answer is option A.

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.

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.

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.

4014. Pressure drop (Δp) and the superficial gas mass velocity (G) in case of packed absorption tower operating in the preloading range are related as

Δp = G

Δp = G0.5

Δp = G2

✅ The correct answer is option C.

4018. Tube side pressure drop in a 1-2 heat exchanger (for turbulent flow of fluids through the tubes) is about __________ times, that in a 1-1 heat exchanger having the same size & number of tubes and operated at the same liquid flow rate.

1-Feb

✅ The correct answer is option D.

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