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Chemical Engineering Interview Questions
Questions Answers Views Company eMail

How can we identify a poisoned food if we are not able to sense it?? . .,(naturally by colour ,smell etc. . .)

1 2962

motor vs pump

Inogent Laboratories,

1 2763

what is difference between open loop system & close loop system by overview.

TCL,

1 3880

Question - Chemical Engineering Material - In crystal material, hexagonal crystal system could form 4-digit index in certain direction of solid. For [1(-1)0] direction in the hexagonal crystal systems of particular catalyst applied in fume removal of incinerator, what is the four-digit index for this direction? Hint : The transformation equations between the 3-digit [h’k’l’] and the 4-digit [hkil] indices are : h = (1/3) (2h’ – k’); i = - (h + k); k = (1/3) (2k’ – h’); l = l’. A. [(-1)100] B. [1(-1)00] C. [(-1)000] D. [00(-1)(-1)] E. [(-1)0(-1)0]

1 2444

Chemical Engineering Unit Operation - Which of the sequence below represent a feasible flows of ethanol processing plants using cellulose as starting material? A. raw material --> heat exchanger --> distillation column --> reactor. B. reactor --> distillation column --> raw material --> heat exchanger. C. heat exchanger --> raw material --> distillation column --> reactor. D. raw material --> heat exchanger --> reactor --> distillation column. E. distillation column --> raw material --> reactor --> heat exchanger.

1 2656

Chemical Engineering Energy Balance - Please match the term A - E as follow with the stated definition : A. Yield. B. Selectivity. C. Relative saturation. D. Molal saturation. E. Absolute saturation. i. Answer : ? (moles of desired product formed) / (moles that would have been formed if there were no side reactions and the limiting reactant has reacted completely). ii. Answer : ? (moles of desired product formed) / (moles of undesired product formed). iii. Answer : ? (relative humidity 40 % means partial pressure of water vapour equals 4 / 10 of the vapour pressure of water at the system temperature). iv. Answer : ? (moles of vapour) / (moles of vapour dry gas). v. Answer : ? (mass of vapour) / (mass of dry gas).

1 2983

why screw compressor use for ammonia compression?

Deepak Fertilisers,

2112

Where barrel pump use?

Deepak Fertilisers,

1870

A distillation column separates 10000 kg / hr of a mixture containing equal mass of benzene and toluene. The product D recovered from the condenser at the top of the column contains 95 % benzene, and the bottom W from the column contains 96 % toluene. The vapor V entering the condenser from the top of the column is 8000 kg / hr. A portion of the product from the condenser is returned to the column as reflux R, and the rest is withdrawn as the final product D. Assume that V, R, and D are identical in composition since V is condensed completely. Find the ratio of the amount refluxed R to the product withdrawn D. Hint : Solve the simultaneous equations as follow in order to find the answer (R / D) : 10000 = D + W; 10000 (0.5) = D (0.95) + W (0.04); 8000 = R + D.

2 13927

Two methanol-water mixtures are contained in separate tanks. The first mixture contains 40.0 wt % methanol and the second contains 70.0 wt % methanol. If 200 kg of the first mixture is combined with 150 kg of the second, what are the mass and composition of the product? The symbol of weight percent is wt %.

2 8439

Chemical Engineering Material Balance - Three hundred gallons of a mixture containing 75.0 wt % ethanol and 25 wt % water (mixture specific gravity = 0.877) and a quantity of a 40.0 wt % ethanol - 60 wt % water mixture (specific gravity = 0.952) are blended to produce a mixture containing 60.0 wt % ethanol. The specific gravity of a substance is the ratio of density of a substance compared to the density of water. The symbol of weight percent is wt %. (a) Estimate the specific gravity of the 60 % mixture by assuming that y = mx c where y is wt % ethanol, x is mixture specific gravity. Values for m and c are constants. (b) Determine the required volume of the 40 % mixture.

1 11913

How many pounds (lb) are available in 1 kilogram (kg), 1 metre (m) has how many feet (ft) and 1 meter (m) has how many inches (in)?

1 2719

can we apply Bernoulli theorem for liquid?

1 3162

Question 8 - A local utility burns coal having the following composition on a dry basis : Carbon (C) 83.05 %, hydrogen (H) 4.45 %, oxygen (O) 3.36 %, nitrogen (N) 1.08 %, sulfur (S) 0.7 % and ash 7.36 %. Calculate the ash free composition of the coal with reference to C, H, O, N and S.

1 5697

what is R1,R2,R3, R4........?

Okaya,

1918


Post New Chemical Engineering Questions

Un-Answered Questions { Chemical Engineering }

What is the method of determining maximum differential pressure during hydro testing of shell and tube heat exchangers?

1122


What is a good source of equations for calculating discharge flowrates from accidental releases?

1147


What diffrence between flush distillation & batch distillation ?

2487


Oil and fat containing food items are flushed with nitrogen. Why?

1079


What is the purpose of capacitor?

1976


What is a good source of surfactant information on the internet?

1248


I would like to know how to size a partial combustion reactor processing methane and oxygen, as a function of the flowrate and of the pressure.

1016


What is difference between overall heat transfer coefficient & individual heat transfer coefficient?

1143


What are the three classes of organic solvents?

1197


What is a black body?

1196


Are some heat transfer services more prone to tube vibration that others for a shell and tube exchanger?

1284


i'm a chemical engineer with an aggregate of 80% and i'm going to attend for TCS next week...if i encounter a question like this how i have to answer... WHY YOU CHOOSE SOFTWARE RATHER THAN YOUR CORE COMPANIES?

2140


Name some factors to consider when trying choosing between a dry screw compressor and an oil-flooded screw compressor?

1034


What is gibbs free energy?

1095


Explain why is post-weld heat treatment (stress relieving) sometimes necessary for welded vessels?

1021