Answer / dhaval modh

unit operation means the operation in which only physical
change occur not chemical.ex.fluid operation,mechanical
operation,heat tranfer operation, mass tranfer
operation.ie.distillation,drying,adsorption etc......

Answer / darshan jagatap

MAIN CHARACTERISTICS OF UNIT OPERATIONS IS THERE IS ONLY
PHYSICAL CHANGE (PHASE CHANGE) AND NO REACTIONS

CHARACTERISTICS:

PHASE CHANGE IS TOBE OBTAINED BY MAINTAING THE PARAMETERS
SUCH AS TEMP, PRESSURE, FLOW, LEVEL ETC

Answer / alok kumar

basically fluid machanics ,heat transfer operation operation
,mass transfer comes in catagory of unit operations.
the basic thing is that during 1 or more unit operations
there is no chemical composition change occur only physical
changes such as temp. etc. change.

Answer / ritam

The maint terms in unit operations are Distillation,
crystallization, leaching, and drying etc.

Answer / praveen peda

main unit operations are DISTILLATION,
DRYING ,LEACHING,ABSORPTION, ADSORPTION,etc

Answer / anusha

the main terms of unit operations are-
drying
size reduction
distillation
evaporation
crystallisation

Answer / nimesh patel

Unit operatons means operation in which physical changes
takes place.
e.g. Drying, extraction

Answer / nisha sharma

basic laws, molecular units, mole fraction, gas laws,
primary and secondary quantities, dimensional formulas,
dimensions, dimensionless equations,dimensional
analysis,graphical integration, all expressions to express
concentration like molarity, molality,etc.

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.

1 Answers  

Question 70 - According to Adolf Eugen Fick (1829 - 1901) : rate of diffusion v increases with less wall thickness t, increased area A and decreased molecular weight of a fluid M. The diffusion constant D decreased with increasing M. (a) By assuming v, t, dP, A, M and D changes proportionally of each other, find the equation of v as a function of t, dP, A and D. (b) The ratio of self diffusion constant D, at T = 273 K and P = 0.1 MPa, for gases B and C are 1.604 : 0.155. If only 2 gases exist in such a system : hydrogen and nitrogen, find the type of gas for B and C with reference to their molecular weights M. (c) By using the equation of kinetic energy 0.5 MV = constant where V = square of v, find the ratio of V for B and V for C, or V(B) / V(C), as a function of M(B) and M(C), where M(B) is molecular weight of B and M(C) the molecular weight of C : Graham's Law of Diffusion.

1 Answers  

What does Dew point -40C mean in an air drying unit.

4 Answers  

DEAR SIR, IS IT ANY BARC TECHNICAL OR INTERVIEW QUESTION BOOK IN CHEMICAL ENGG LAST YEARS IN MARKET? ALSO GIVE THE PATTERN HOW TO PREPARE AND WHAT TYPE OF QUESTION THEY ASKED?

0 Answers   BARC, Reliance,

What are the apt definitions for apparent power, active power and reactive power? Explain about different types of lamps?

0 Answers  

what is the role of a chemical engineer on a cement plant?

4 Answers  

Three solid objects of the same material and of equal mass – a sphere, a cylinder (length = diameter) and a cube – are at 5000C initially. These are dropped in a quenching bath containing a large volume of cooling oil each attaining the bath temperature eventually. The time required for 90% change of temperature is smallest for a) cube b) cylinder c) sphere d) equal for all the three whyyyyyyy???????

3 Answers   GATE,

QUANTUM CHEMISTRY AND CHEMICAL ENGINEERING - EXAMPLE 31.7 : (a) The correct statement about both the average value of position (<x>) and momentum (<p>) of a 1-dimensional harmonic oscillator wavefunction is <x> = <p> = 1 - x. Find the value of x. (b) The probabilities of finding a particle around points A, B and C in the wavefunction y = f(x) are P(A), P(B) and P(C) respectively. Coordinates are A (3,5), B (4,-10) and C (6,7). Arrange P(A), P(B) and P(C) in term of a < b < c, when | y-coordinate | signifies the probability.

1 Answers  

What is an additive?

0 Answers  

What are some typical applications for glass-lined reactors?

0 Answers  

What are some guidelines for designing for liquid and gas velocities in process plant piping?

0 Answers  

ENGINEERING MECHANIC - EXAMPLE 15.1 : What is the meaning – strain? In a distillation column, if a block 10 cm on a side is deformed so that it becomes 9 cm long, what is the strain involved in percentage?

1 Answers