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Questions and Answers
Which of the following statements is true about the complex conjugate with positive real parts?
Which of the following statements is true about the complex conjugate with positive real parts?
Which of the following is the controlling resistance in a rotary drum vacuum filter?
Which of the following is the controlling resistance in a rotary drum vacuum filter?
What is the reaction order for the reaction 3A -> B, given that the dimensions of the rate constant are (l/gm mole)/min?
What is the reaction order for the reaction 3A -> B, given that the dimensions of the rate constant are (l/gm mole)/min?
Which of the following drugs is used in contraceptives?
Which of the following drugs is used in contraceptives?
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For the same thickness, which of the following head shapes can withstand the highest pressure in a cylindrical vessel?
For the same thickness, which of the following head shapes can withstand the highest pressure in a cylindrical vessel?
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The energy distribution of an ideal reflector at higher temperatures is largely in the range of:
The energy distribution of an ideal reflector at higher temperatures is largely in the range of:
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What is the main reason for the increase in the rate of reaction with temperature?
What is the main reason for the increase in the rate of reaction with temperature?
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What happens to the insulation ability of an insulator in the presence of moisture?
What happens to the insulation ability of an insulator in the presence of moisture?
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What does kinematic viscosity represent?
What does kinematic viscosity represent?
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Which size reduction operation is the main operation in ultrafine grinders?
Which size reduction operation is the main operation in ultrafine grinders?
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What is the most common packing used in industrial operations?
What is the most common packing used in industrial operations?
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For which order reactions does a series of 'N' plug flow reactors with total volume 'V' give the same conversion as a single plug flow reactor of volume 'V'?
For which order reactions does a series of 'N' plug flow reactors with total volume 'V' give the same conversion as a single plug flow reactor of volume 'V'?
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What is the approximate bandwidth of on-off control, which is a special case of proportional control?
What is the approximate bandwidth of on-off control, which is a special case of proportional control?
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What is the equivalent value of 1 centipoise in the given units?
What is the equivalent value of 1 centipoise in the given units?
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What is the value of 1 torr in terms of mm of Hg column?
What is the value of 1 torr in terms of mm of Hg column?
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If 1000 kg of wet solids are to be dried from 60% to 20% moisture, what is the mass of water removed in kilograms?
If 1000 kg of wet solids are to be dried from 60% to 20% moisture, what is the mass of water removed in kilograms?
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What is the weight of 2 litres of nitrogen at NTP (Normal Temperature and Pressure) in grams?
What is the weight of 2 litres of nitrogen at NTP (Normal Temperature and Pressure) in grams?
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What should be done to increase the absorption factor in a fluid energy mill?
What should be done to increase the absorption factor in a fluid energy mill?
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What is the transfer function of transportation lag?
What is the transfer function of transportation lag?
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What causes the sensation of ears 'popping' when traveling into the mountains?
What causes the sensation of ears 'popping' when traveling into the mountains?
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How does a triangular pitch tube layout in a shell and tube heat exchanger compare to a square pitch layout?
How does a triangular pitch tube layout in a shell and tube heat exchanger compare to a square pitch layout?
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What is the fractional volume change between no conversion and complete conversion for the isothermal gas phase reaction 2A → R?
What is the fractional volume change between no conversion and complete conversion for the isothermal gas phase reaction 2A → R?
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For the isothermal gas phase reaction A + 3B, what is the fractional volume change between no conversion and complete conversion?
For the isothermal gas phase reaction A + 3B, what is the fractional volume change between no conversion and complete conversion?
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Which law states that the fugacity of a gas in a mixture is equal to the product of its mole fraction and its fugacity in the pure state at the total pressure of the mixture?
Which law states that the fugacity of a gas in a mixture is equal to the product of its mole fraction and its fugacity in the pure state at the total pressure of the mixture?
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What is the primary function of a transducer?
What is the primary function of a transducer?
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What is the purpose of manholes provided in the shell of a distillation column?
What is the purpose of manholes provided in the shell of a distillation column?
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Which dimensionless number represents the ratio of buoyancy force to viscous force?
Which dimensionless number represents the ratio of buoyancy force to viscous force?
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Study Notes
Chemical Engineering
- 'N' plug flow reactors in series with a total volume 'V' give the same conversion as a single plug flow reactor of volume 'V' for order reactions.
Control Systems
- On-off control has a band width of about 0 percent.
Viscosity
- 1 centipoise is equivalent to 1 gm/cm.second.
Pressure Units
- 1 torr is equal to 1 mm Hg column.
Drying
- To dry 1000 kg of wet solids from 60% to 20% moisture, 400 kg of water is removed.
Gas Properties
- 2 litres of nitrogen at N.T.P. weigh 28 gms.
Baffle Design
- A 25% cut segmental baffle means the baffle width is 25% of its height.
Radiation
- If 40% of incident radiant energy on the surface of a thermally transparent body is reflected back and the transmissivity of the body is 0.15, then the emissivity of the surface is 0.45.
Stoichiometry
- 6 Kg of carbon is burnt with an amount of air containing 18 gm oxygen to produce 16.5 gms CO2 and 2.8 gms CO besides other constituents.
Complex Conjugate
- Complex conjugate roots can have positive real parts or one real positive and the other real negative.
Gas Laws
- The value of R (gas constant) may be less than, equal to, or greater than 1 depending on the nature of the gas.
Filtration
- The controlling resistance in a rotary drum vacuum filter is the cake resistance.
Reaction Kinetics
- The rate constant for a reaction 3A -> B has dimensions of (l/gm mole)/min, which indicates a third-order reaction.
Pharmaceuticals
- Mestranol is a drug used in contraceptives.
Pressure Vessel Design
- A torispherical head can withstand the highest pressure.
Thermal Radiation
- The energy distribution of an ideal reflector at higher temperatures is largely in the range of longer wavelengths.
Grinding
- The energy required to grind limestone particles from a very large size to 50 µm is approximately 25.4 kWh/ton.
Thermodynamics
- Entropy is a state function, and the entropy change of a system is zero for a reversible process.
Chemical Reaction
- The increase in the rate of reaction with temperature is due to an increase in the average kinetic energy of the reacting molecules and a decrease in activation energy.
Filtration
- In constant rate filtration, the inlet pressure increases continuously.
Insulation
- The insulation ability of an insulator decreases with the presence of moisture.
Viscosity
- Kinematic viscosity is the ratio of absolute viscosity to the density of the liquid.
Size Reduction
- The main size reduction operation in ultrafine grinders is attrition.
Packing Materials
- Raschig rings are commonly used packing materials in industrial operations.
Air Pollution Control
- Electrostatic precipitators are efficient equipment for the removal of sub-micronic dust particles from blast furnace gas.
Absorption
- To increase the absorption factor, increase 'S' (solvent flow rate) and decrease 'G' (gas flow rate).
Control Systems
- The transfer function of transportation lag is e^-TS.
Human Physiology
- The "popping" of ears as altitude increases is caused by high-pressure air from the surroundings moving rapidly into the low-pressure air in the ears.
Heat Exchanger Design
- Triangular pitch tube layout permits the use of more tubes in a given shell diameter compared to square pitch in a shell and tube heat exchanger.
Fertilizers
- Triple superphosphate is manufactured by reacting phosphate rock with sulphuric acid.
Stoichiometry
- The fractional volume change between no conversion and complete conversion for the isothermal gas phase reaction 2A -> R is -0.5.
Thermodynamics
- The fugacity of a gas in a mixture is equal to the product of its mole fraction and its fugacity in the pure state at the total pressure of the mixture, according to Raoult's law.
Transducers
- A transducer converts the primary signal into a more useful quantity, usually an electric impulse.
Distillation Column Design
- Manholes provided in the shell of a distillation column give access to individual trays for cleaning, maintenance, and inspection.
Dimensionless Numbers
- The Grashof Number is the ratio of buoyancy force to viscous force.
Chemical Kinetics
- The half-life period of a first-order reaction is given by 0.693/K.
Thermodynamics
- The heat capacity of a substance is higher for liquid state than for solid state.
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Description
Test your knowledge in chemical reaction engineering with questions on plug flow reactors, order reactions, and control systems. Be cautious as not all answers are correct, but most of them are. This quiz covers topics like N plug flow reactors in series, conversion in a single plug flow reactor, and on-off control special cases with band width percentage.
