Answer / nilkanth patni

operation at which only physical changes occurs isknown as
the unit operation.
eg, distillation, drying, filtration etc....

Answer / guest

NO CHEMICAL REACTION INVOLVED

Answer / priyank sompura

distilation , drying ,absorption etc.................... are
unit operation

Answer / faiz khan

Suppose we are synthesizing aspirin in the lab then there are a number of operation we have to perform like mixing, heating, evaporating the solvent or filtering the solid and then drying to get the final product (aspirin). This is a unit process(synthesis of aspirin) in which a number of unit operations are involved.

Answer / manish

Drying,crystallisation,extration,and many heat transfer cofficient all process in unit operation
No chemical reaction involved in process

Answer / hm

Unit operation is part of chemical process industries to raw material convert in product only involves physical changes.
Ex. Mass transfer , crystallisation , fluid flow operation , mass operation , gas absorption etc

Answer / sharief

mixersettlers,distillation coloumns,driers,......

Answer / vibha porwal

unit operation is just like telling us about the procedure
for any equipment to operate.

sir i am senthil B.Tech Chemical Engineer which book is refer for objective type questions?

2 Answers   BARC, GATE,

What is the procedure to estimate the friction factor involved in heat exchanger tubes?

0 Answers  

How are plate heat exchangers used in an ammonia refrigeration system?

1 Answers   HJ, Reliance,

What does the catalytic converter on an automobile really do?

0 Answers  

DIFFERENTIAL EQUATIONS - EXAMPLE 20.1 : By using Excel program either on laptop or desktop PC, solve the differential equation dy / dx = -2y + x + 4 with h = 0.005, initial values : x = 0, y = 1. The 4th order Runge-Kutta method provides : y(N + 1) = y(N) + (1/6) (k1 + 2k2 +2k3 + k4), k1 = h [ -2y(N) + x(N) + 4 ], k2 = h { -2 [ y(N) + k1 / 2 ] + x(N) + h / 2 + 4 }, k3 = h { -2 [ y(N) + k2 / 2 ] + x(N) + h / 2 + 4 }, k4 = h { -2 [ y(N) + k3 ] + x(N) + h + 4 }. What is the value of y at x = 0.5?

1 Answers  

According to Shockley equation, the I – V characteristic of a diode is approximated by I = IS [ exp (nVD / VT) – 1 ]. For silicon, let the reverse bias saturation current IS as 0.000000000001. If n is ideality factor with value of 1.5, VT as thermal voltage drop of 0.026 V at room temperature, what is the value of current I that passes through the silicon diode in the heater of evaporator when the forward voltage drop VD = 0.026 V? Please take note that exp is the exponential function with e(1) = 2.718, e(2) = 7.389.

1 Answers  

Explain the common failure mechanism for above ground atmospheric storage tanks?

0 Answers  

Question 81 - (a) In natural gas pipe sizing, the length of the pipe from the gas source metre to the farthest appliances is 60 feet. The maximum capacities for typical metallic pipes of 60 feet in length are : 66 cubic feet per hour for pipe size of 0.5 inches; 138 cubic feet per hour for pipe size of 0.75 inches; 260 cubic feet per hour for pipe size of 1 inch. By using the longest run method : (i) Find the best pipe size needed for the capacity of 75 cubic feet per hour. (ii) Estimate the suitable range of capacities for the pipe size of 1 inch. (b) The maximum capacities for typical metallic pipes of 50 feet in length are : 73 cubic feet per hour for pipe size of 0.5 inches; 151 cubic feet per hour for pipe size of 0.75 inches; 285 cubic feet per hour for pipe size of 1 inch. By using the branch method find the best pipe size needed for the capacity of 75 cubic feet per hour when the length of the pipe from the gas source metre to the appliance is 52 feet.

1 Answers  

Corenuts technology interview questions

0 Answers  

Question 40 - A stream with volumetric flow rate Q enters a cylindrical tank and a stream with volumetric flow rate q exits the tank. The fluid has a constant heat capacity and density. There is no temperature change or chemical reaction occurring in the tank. Develop a model for determining the height of the tank, h. Let V is the volume, A is the cross sectional area, r is the density, m is the mass, where V and A are for the tank, r and m are for the fluid. The rate of mass of fluid accumulation, dm / dt = (Q - q) r. Prove the model to be dh / dt = (Q - q) / A.

1 Answers  

what is mass flow rate of steam of 7 kg/cm2 pressure in 1 inch id. pipe.

0 Answers   Ascent,

what is the cast iron grade of composition of c-3.06% , Mn- 0.48% , Si-2.38% , S-0.088% , P-0.092% , Cr-0.12% , Ni- 0.012% , Mo-0.00%

0 Answers   L&T,