Heat and Mass Transfer
1. Which mode of heat transfer relies on the movement of fluid due to density differences caused by temperature variations?
A) Conduction
B) Convection
C) Radiation
D) Evaporation
2. Which law of heat transfer states that the rate of heat transfer through a material is directly proportional to the temperature difference across the material and inversely proportional to the material's thermal resistance?
A) Fourier's Law
B) Newton's Law of Cooling
C) Stefan-Boltzmann Law
D) Fick's Law
3. Which device is commonly used for simultaneous heat and mass transfer operations, such as cooling and dehumidification?
A) Heat exchanger
B) Distillation column
C) Absorption tower
D) Reactor vessel
4. What is the primary mechanism of heat transfer in a vacuum flask (thermos)?
A) Conduction
B) Convection
C) Radiation
D) Vaporization
5. Which principle is utilized in evaporative cooling systems to reduce air temperature?
A) Dalton's Law
B) Raoult's Law
C) Henry's Law
D) Dalton's Law of Partial Pressures
6. Which type of heat exchanger maximizes surface area for efficient heat transfer by utilizing multiple parallel flow paths for fluids?
A) Shell and tube heat exchanger
B) Plate heat exchanger
C) Double-pipe heat exchanger
D) Spiral heat exchanger
7. Which factor affects the rate of convective heat transfer between a solid surface and a fluid medium?
A) Surface area of the solid
B) Thermal conductivity of the solid
C) Density of the fluid
D) Temperature difference between the solid and fluid
8. Which mass transfer process involves the separation of components in a mixture based on differences in vapor pressure at a specific temperature?
A) Distillation
B) Absorption
C) Extraction
D) Filtration
9. What is the primary driving force for mass transfer in an absorption process?
A) Temperature difference
B) Pressure difference
C) Concentration difference
D) Surface area
10. Which unit operation is commonly used to remove contaminants from air or gas streams using a liquid solvent?
A) Distillation
B) Filtration
C) Absorption
D) Crystallization
Particle Technology
1. What is the term used to describe the process of converting a liquid into small droplets or particles dispersed in a gas medium?
A) Evaporation
B) Condensation
C) Atomization
D) Filtration
2. Which property of a powder material determines its resistance to flow under gravitational forces?
A) Particle size
B) Bulk density
C) Porosity
D) Angle of repose
3. Which separation technique is based on the settling velocity of particles in a fluid medium under the influence of gravity?
A) Filtration
B) Sedimentation
C) Cyclone separation
D) Centrifugation
4. What is the primary purpose of using cyclones in particle technology?
A) Particle size reduction
B) Particle size enlargement
C) Particle size classification
D) Particle size distribution
5. Which unit operation involves the agglomeration of fine particles to form larger particles or granules for easier handling and processing?
A) Sieving
B) Milling
C) Filtration
D) Granulation
6. Which property of particles affects their ability to scatter light and appear opaque in suspension?
A) Surface area
B) Particle size
C) Density
D) Porosity
7. Which mechanism is primarily responsible for the adhesion of fine particles to surfaces in processes such as powder coating and aerosol deposition?
A) Electrostatic attraction
B) Van der Waals forces
C) Capillary action
D) Hydrogen bonding
8. Which type of filtration is used to separate particles based on size using a porous medium?
A) Centrifugal filtration
B) Vacuum filtration
C) Microfiltration
D) Electrostatic filtration
9. What is the purpose of using milling operations in particle technology?
A) To reduce particle size
B) To increase particle density
C) To enhance particle porosity
D) To improve particle surface area
10. Which technique is commonly used to measure the size distribution of particles in a powder sample?
A) X-ray diffraction
B) Scanning electron microscopy (SEM)
C) Dynamic light scattering (DLS)
D) Nuclear magnetic resonance (NMR)
Separation Processes
1. Which separation technique is commonly used to separate components in a liquid mixture based on differences in boiling points?
A) Filtration
B) Distillation
C) Crystallization
D) Absorption
2. What is the primary driving force for mass transfer in an absorption process?
A) Temperature difference
B) Pressure difference
C) Concentration difference
D) Surface area
3. Which separation process is used to separate suspended solids from a liquid by passing the mixture through a porous medium?
A) Distillation
B) Filtration
C) Extraction
D) Crystallization
4. Which technique is used to separate a liquid mixture into its individual components based on differences in solubility in a solvent?
A) Distillation
B) Crystallization
C) Extraction
D) Chromatography
5. Which separation process is used to purify a solid compound by converting it from its dissolved state back to its solid form?
A) Distillation
B) Crystallization
C) Filtration
D) Absorption
6. Which separation technique is used to separate components in a gas mixture based on differences in diffusion rates through a semi-permeable membrane?
A) Distillation
B) Filtration
C) Dialysis
D) Reverse osmosis
7. What is the purpose of using chromatography in separation processes?
A) To separate components based on boiling points
B) To separate components based on solubility
C) To separate components based on molecular size and affinity
D) To separate components based on density differences
8. Which separation technique is used to separate components in a mixture based on differences in vapor pressure and condensation properties?
A) Filtration
B) Absorption
C) Distillation
D) Crystallization
9. Which separation process is commonly used to remove dissolved salts from seawater to obtain fresh water for drinking purposes?
A) Filtration
B) Distillation
C) Reverse osmosis
D) Crystallization
10. Which unit operation involves the separation of particles based on differences in settling velocities in a liquid medium under gravity?
A) Sedimentation
B) Centrifugation
C) Filtration
D) Distillation
