APPSC Chemical Engineering 14 March 2020 Question Paper with Answers Key

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APPSC Chemical Engineering 14 March 2020 Question paper with Answers Key- APPSC conducted Lecturers in Government Polytechnic Colleges (Engineering and Non-Engineering) in A.P Technical Education Service exam on 14 March 2020 FN from 10.00 AM to 12.30 PM. Here we are providing some of the questions asked in APPSC Chemical Engineering Paper.

…….. is true with regard to an isothermal process?

The true temperature of the system doesn’t change

…….. is the unit of fugacity?

Atm

…… is not true for the Navier – strokes equation?

It is a steady equation

…….. are the driving force of the convection?

Buoyancy forces

……. Is not an assumption of film theory?

Unsteady states mass transfer occurs in the liquid phase

…… is not true with regard to Knudsen diffusivity?

Knudsen diffusivity is not function of temperature

……. Is not a radioactive isotope?

Carbon-12

Chemical reactions with very low activation energy are?

Unaffected by temperature changes

The state chemical equilibrium according to the laws of Chemical Kinetics is?

Dynamic & steady

What does a manometer measure?

Pressure difference

If the isothermal expansion of an ideal gas takes place, then?

Enthalpy of the gas remains constant

The internal energy of an Ideal gas is function of?

Temperature only

In which condition Is the equation of state PV=nRT best obeyed by real gases?

At low pressure and high temperature

The clayperon equation addresses the?

Rate of change of vapour pressure with temperature of the system

Which law thermodynamics states; The energy of the isolated system remains constant?

First law of thermodynamics

Radiation is emitted by?

solids, liquids and gases

The value of coefficient of compressibility (also called bulk modulus of compressibility) of incompressible fluid is?

Infinity

Screening is a method of separating particles according to their?

Size

APPSC Chemical Engineering 14 March 2020 Paper

In a ball mill, most of the size reduction of the particles is done by?

Impact

Which parameter doesn’t appear in Bernoulli’s equation?

Time

…… is true with regard to the particle that is settling in water at its terminal settling velocity?

Weight = buoyant + drag force

The velocity boundary layer and the thermal boundary layer merge when?

Prandtl number is 1

In heat exchangers, the equivalent diameter is equal to?

4 x hydraulic radius

The unsteady state heat conduction means?

Temperature distribute changes with respect to time

Heat flux is defined as the time rate of heat transfer per unit of?

Area

In free convection, the Nusselt number is a function of?

Gr and Pr

A Fully developed flow impiles that the …… doesn’t change in fluid flow direction?

Momentum distribution

For the observation of gas in a countercurrent packed bed coloumn, the operating line?

lies above the equilibrium curve

Chemical Engineering

APPSC Chemical Engineering 14 March 2020 Questions and answers

The molecular diffusivity of a gas?

Increases with temperature

The Peclet number is given by?

Pe=Re.Sc

Which solutes has the highest molecular diffusivity in water?

Methanol

For helping to absorb a less soluble gas in a liquid?

Liquid-side mass transfer coefficient should be increased

The leaching time decreases as?

Temperature increases

The freundlich equation is related to the process of?

Adsorption

What is the ratio of the mean residence time to space time when the density of reactants is constant?

1

Which theory explains the mechanism of homogeneous and heterogeneous catalysis?

Collision theory

A catalyst increases the rate of reaction by?

Decreasing the activation energy

The pore diffusion resistance in a catalyst in negligible when the thiele modulus is?

Less than 0.5

APPSC Chemical Engineering 14 March 2020 paper with Key

Which reactors is preferred in laboratories and pharmaceutical industries?

Batch reactor

Pairs of gases is the Dalton’s Law of partial pressures not applicable?

Ammonia and Hydrogen chloride

ABR is a reactor used widely for the production of biogas; The Full form of ABR is?

Anaerobic baffled reactor

The reactor commonly used for catalytic cracking processes is?

Fluidised bed reactor

What do you mean by a space time of five hours for a flow reactor?

The time required to process one reactor volume of feed is five hours

The Optical pyrometers can be used measure and view wavelengths less than or equal to?

0.65 microns

The compositional analysis of using mass spectrograph?

Isotopes

The bourdon tube in a vapour pressure thermometer indicates a rise in?

Vapour pressure

The working principle of orifice meter is same as?

Venturi meter

What is the laplace transform of the function?

I/S-a

APPSC Chemical Engineering Answers Key 14 March 2020

The change in the output induced by a unit change in the input is called?

Process again

The iron-Constantan thermocouple is a?

Type J- thermocouple

The string psychrometer contains ….. thermometers?

Two

Which expressions give the ressitance of a gas in a vessel?

V/nRT

…….. is a first order system?

Mercury in glass thermometer kept in n=boiling water

…… is true for a second-order underdamoed system?

Decay ratio = (overshoot)²

Correct formula for calculating the amolitude ratio (AR) is?

AR = 20 log (Am/Ar)

The gain margin in a Bode pilot will be equal to the?

Reciprocal of amplitude ratio

Which property of mercury is disadvantageous for measuring low differential pressures?

High Density

The annuity in which periodic payments continue identifinetely is called?

Perpeturiry

APPSC Chemical Engineering 14 March 2020 Full Question Paper & Key

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