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 2280

motor vs pump

Inogent Laboratories,

1 1961

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

TCL,

1 3053

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 1712

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 1836

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 2193

why screw compressor use for ammonia compression?

Deepak Fertilisers,

1482

Where barrel pump use?

Deepak Fertilisers,

1387

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 12192

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 7368

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 10926

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 2045

can we apply Bernoulli theorem for liquid?

1 2321

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 4678

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

Okaya,

1469


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Un-Answered Questions { Chemical Engineering }

How does a tank-blanketing valve operate?

698


Explain what are the assumptions made on conservation equation?

682


why screw compressor use for ammonia compression?

1482


What do we use carburizing/nitriding chemicals for?

637


How to caliculate the boil up rate, dia and height in both packed and tray distillation columns and any referance books for the design.

2108






hello everyone do anyone have interview questions for any chemical industry please email me at

1674


Under what circumstances are vortex flowmeters the most accurate?

620


Explain how can one quickly estimate the additional pressure drop to be introduced with more tube passes?

580


What are the main terms in unit operations? What are its characteristics?

634


How can one determine if a particular solid can be fluidized as in a fluidized bed?

604


What is the ignition temp. of Alluminium,Coper&Iron.

1794


How can you estimate a gas flow based on two pressure measurements?

615


What are the different characteristics that can affect the flow of bulk solids and how?

637


what is the hearth and arch pressure in furnace?

3595


What is a good method of steam tracing large vessels?

682