FOOD ENGINEERING - QUESTION 23.3 : (a) In the measurement of the browning (optic

FOOD ENGINEERING - QUESTION 23.3 : (a) In the measurement of the browning (optical density) of fruit juice at 10 day interval, the following pairs of data are obtained with time t in days and browning or optical density (OD) : t = 0, OD = 0.05; t = 10, OD = 0.071; t = 20, OD = 0.089; t = 30, OD = 0.11; t = 40, OD = 0.128; t = 50, OD = 0.149; t = 60, OD = 0.17. (i) By using Excel or other programs, determine if such browning reaction can be characterised by pseudo zero order kinetics, with strong correlations between the data pairs of t and OD. (ii) When OD = 0.24, the shelf life T of such juice is expired. Calculate the value of T. (b) Let food cost percentage = ( food cost / food sales ) x 100. If total food cost of bread and butter are $25, food cost percentage of bread is 50 % and for butter is 50 %, find the total food sales of bread and butter.

Question Posted / kangchuentat

1 Answers
2167 Views
I also Faced
E-Mail Answers

FOOD ENGINEERING - QUESTION 23.3 : (a) In the measurement of the browning (optical density) of fruit..

Answer / kangchuentat

FOOD ENGINEERING - ANSWER 23.3 : (a) (i) Excel program is used for quick graph plotting where x-axis is t and y-axis is OD. A linear graph with equation y = 0.002 x + 0.0501 with r squared value of 0.9996 could be obtained. High r squared value approaching 1 signifies strong correlations between the data pairs of t and OD for pseudo zero order kinetics. (ii) By using the equation y = 0.002 x + 0.0501, substituting y for OD and x for T, then T = (OD - 0.0501) / 0.002 = (0.24 - 0.0501) / 0.002 = 94.95 days. (b) Total food cost = c + d = $25 = 0.5 (C + D) and total food sales = C + D = (c + d) / 0.5 = 25 / 0.5 = $50 where c = food cost of bread, d = food cost of butter, C = food sales of bread, D = food sales of butter. The answer is given by Kang Chuen Tat; PO Box 6263, Dandenong, Victoria VIC 3175, Australia; SMS +61405421706; chuentat@hotmail.com; http://kangchuentat.wordpress.com.

Is This Answer Correct ?

0 Yes

0 No

Post New Answer

More Chemical Engineering Interview Questions

What is chemicals?

1 Answers Thirumalai Chemicals,

ENGINEERING NUMERICAL METHODS - EXAMPLE 19.1 : Solve the simultaneous equation using simple Excel program : r + s - t = 7, 2r - s = 0, 3r + 2t = 15. Explain the use of functions of MINVERSE and MMULT together with the keyboard C (Ctrl) + S (Shift) + E (Enter).

1 Answers

wha is Adsorption column chromatography?

0 Answers

Question 44 - In a non-dilute absorber, graphical method is used to represent the process. In an X - Y coordinate system, X-axis represents mole of carbon dioxide / mole of water and Y axis represents mole of carbon dioxide / mole of nitrogen. The inlet gas stream consists of 8 mol % of carbon dioxide in nitrogen. (a) Find the S / G minimum as a slope that goes through the point (0, 0.0304) and (0.0000488, 0.086957). (b) Find the actual slope of operating line when it is 1.5 times the S / G minimum! (c) Find the value of x for inlet gas stream when y = 1640 x, y is mole fraction of carbon dioxide in nitrogen.

1 Answers

A shiny brown colored element ‘x’ on heating in air becomes black in cooler name the element ‘x’and black colored compound formed?

0 Answers

Question 35 – A mixture consists of benzene (B), toluene (T) and xylene (X). At a temperature of 353 K, the data of vapor pressures : B : 754.12, T : 289.71, X : 91.19. Unit is mm Hg. The pressure P is 0.5 atm. The value of k for each substance is k = (vapor pressure) / P. (a) Calculate k for B, T and X. Let L / V = 0.65. (b) By using the equation V = F / [ (L / V) + 1 ], find the value of V when F = 100, then what is the value of L?

1 Answers

Is there a rule of thumb to estimate the footprint of a cooling tower during design phase?

0 Answers

Corenuts technology interview questions

0 Answers

which materials can l use if l want to use length wave 680 to 900 in hplc

0 Answers

Define a solvent?

0 Answers

Suggest the best book for barc written test guide me the syllabus

1 Answers

which is the major cement producing state in western India ?

2 Answers BNPM,

For more Chemical Engineering Interview Questions Click Here