Chemical Engineering

A process stream of dilute aqueous solution flowing at the rate of10 Kg.s^-1 is to be heated. Steam condensate at 95�C is available for heating purpose, also at a rate of 10 Kg.s^-1. A 1 - 1 shell and tube heat exchanger is available. The best arrangement is

In distillation columns, the number of bubble caps per tray primarily depends upon the

The difference of wet bulb temperature and adiabatic saturation temperature of unsaturated mixture of any system is

Heat produced when a steady state current, I passes through an electrical conductor having resistance, 'R' is

In the equation Q = UAΔt; Δt is

Maximum allowable concentration of CO₂ in air for safe working is __________ ppm (parts per million).

In a solution containing 0.30 Kg mole of solute and 600 kg of solvent, the molality is

The amount of steam required per unit quantity of distillate in case of steam distillation will be reduced by

A metal wire of 0.01 m dia and thermal conductivity 200 W/m.K is exposed to a fluid stream with a convective heat transfer coefficient of 100 W/m².K. The Biot number is

Main pollutants released from iron & steel industry is

Suspended solid present in the waste water generated in blast furnace gas cooling and cleaning plant is removed by

Overall efficiency of the distillation column is

The thermal efficiency of a reversible heat engine operating between two given thermal reservoirs is 0.4. The device is used either as a refrigerator or as a heat pump between the same reservoirs. Then the coefficient of performance as a refrigerator (COP)_R and the co-efficient of performance as a heat pump (COP)_HP are

jH factor for heat transfer is not a function of the __________ number.

Mass transfer rate between two fluid phases does not necessarily depend on the __________ of the two phases.

H₂S present in gaseous stream can be removed by adsorption on

Design calculation for multiple component distillation is done by

For an ideal black body

Which of the following is the common pollutant emitted from metallurgical smelters, thermal power plant and cement plants ?

Air initially at 101. 3 kPa and 40^oC and with a relative humidity of 50%, is cooled at constant pressure to 30^oC. The cooled air has a

Total reflux in a distillation operation requires minimum

When vaporisation takes place directly at the heating surface, it is called

Which of the following is the most suitable for extraction in a system having very low density difference ?

Compound A is extracted from a solution of A + B into a pure solvent S. A Co-current unit is used for the liquid-liquid extraction. The inlet rate of the solution containing A is 200 moles of B/hr.m² and the solvent flow, rate is 400 moles of S/m². hr. The equilibrium data is represented by Y = 3X² , where Y is in moles of a A/moles of B and X is in moles A/moles of S. The maximum percentage extraction achieved in the unit is

The steam ejector is used to

Radiant energy received by a body is proportional to (where, d = the distance between the object emitting radiation and that receiving it.)

Which of the following is the correct expression of the aeration period in hours?

Reynold's analogy states that

Relative humidity is the ratio of the

Thermal conductivity is maximum for which substance

Which of the following statement is correct?

Which of the following is the most detrimental for water used in high pressure boiler ?

Which is the best and the most effective method for the removal of organic contaminant present in the polluted water in very small quantity (say < 200 mg/litre)?

Prandtl number for water at 20^oC is about

If the gas phase composition of a component A is 0.65 and its relative volatility is 2. Find the liquid phase composition.

In which type of boiling the temperature of the liquid exceeds the saturation temperature?

 What is the fire demand of the city of 1lakh population by Buston’s formula?

 A new phase is given for the separation by distillation.

Which among the following is the statement of the ‘Fick’s Law’?

In which of the following units, design period is maximized?

Match the following
1) Hendry’s law – a)Ideal solution
2) Dalton’s law – b)Non- Ideal solution
3) Raoult’s law -c)Sum of partial pressure 

Estimate the diffusion coefficient for ammonia in air t 25 degree Celsius temperature and one atmospheric pressure.
For ammonia,
Molecular weight = 17
Molecular volume = 25.81 cm³/gm mole
For air,
Molecular weight = 29 

The boiling phenomenon is known to occur in how many forms?

The equilibrium characteristics of the solubility of gas in liquid helps to determine the

Fenske equation determines the

At the gas temperature, the liquid is in equilibrium with vapour for

In Joule`s experiment, an insulated container contains 20 kg of water initially at 25°C. It is stirred by an agitator, which is made to turn by a slowly falling body weighing 40 kg through a height of 4 m. The process is repeated 500 times. The acceleration due to gravity is 9.8 ms^-2. Neglecting the heat capacity of agitator, the temperature of water (in °C) is

The rate equation used to describe the mechanism of convection is called Newton’s law of cooling. So rate of heat flow by convection doesn’t depend on

Convective heat transfer coefficient doesn’t depend on

The Judges of the High Court hold office

The diagram shows heat conduction through a plane wall. The surface temperature is 475 K and it radiates heat to the surroundings at 335 K. If thermal conductivity of the material is 12.5 W/m degree, find the temperature gradient. Let convective coefficient be 80 W/m² degree and radiation factor is 0.9

Many types of heat exchangers have been developed to meet the widely varying applications. Based upon their
(i) Operating principle
(ii) Arrangement of flow path
(iii) Design
Identify the correct statements

Establish a relation for the shape factor of cylindrical cavity with respect to itself of depth h and diameter d. The cavity is closed on its outer surface with a flat plate

Solubility of a gas increases with increase in temperature.

The literature of heat transfer generally recognizes distinct modes of heat transfer. How many modes are there?

The point where the operating line and the equilibrium line meets in distillation methods is known as

 What is the molecular volume of air at normal boiling point? 

The value of transmissivity may vary from

The maximum flow through the period at D is

In how many categories heat exchangers are classified on the basis of mechanical design of heat exchanger surface?

What is the value of Schmidt number for hydrogen?

How many types of convection process are there?

Figure shows equimolal diffusion between species B and C. Identify the correct molar diffusion rate

Consider system A at uniform temperature t and system B at another uniform temperature T (t > T). Let the two systems be brought into contact and be thermally insulated from their surroundings but not from each other. Energy will flow from system A to system B because of

Radiant energy with an intensity of 800 W/m² strikes a flat plate normally. The absorptivity is thrice the reflectivity and twice the transmissivity. Determine the rate of transmission

For an air(A)-water vapour(B) mixture, the partial pressure of the air is 5 pa and the total pressure of the system is 15 pa. The absolute humidity in mass of air/mass of water vapour is