Question: Which of the following furnaces will have maximum thermal efficiency ?

• 1. Soaking pits
• 2. Walking beam reheating furnace
• 3. Boiler furnace
• 4. Rotary kilns

Question: Ostwald charts are meant for__________________?

• 1. Computing the excess/deficiency of combustion air
• 2. Calculation of flue gas temperature
• 3. Computation of flue gas analysis
• 4. None of these

Question: The Knudsen diffusivity is dependent on the ______________________?

• 1. Molecular velocity only
• 2. Pore radius of the catalyst only
• 3. Molecular mean free path only
• 4. Molecular velocity and pore radius of the catalyst

Question: The binary diffusivity in gases does not depend upon the ___________________?

• 1. Pressure
• 2. Temperature
• 3. Nature of the components
• 4. None of these

Question: Diffusivity in concentrated solutions differs from that in dilute solutions, because of the changes in ____________________?

• 1. Viscosity with concentration
• 2. Degree of ideality of the solution
• 3. Both A and B
• 4. Neither A nor B

Question: The assumption made in Elis method in distillation is that enthalpy concentration lines of vapor and liquid are __________________?

• 1. Parallel
• 2. Straight
• 3. Both parallel and straight
• 4. Neither parallel nor straight

Question: For contacting a highly soluble gas with a liquid ____________________?

• 1. Bubble the gas through liquid
• 2. Spray the liquid on gas stream
• 3. Either A or B would suffice
• 4. None of these

Question: Which of the following remains constant during sensible cooling process ?

• 1. Specific humidity
• 2. Partial pressure of vapour
• 3. Both A and B
• 4. Neither A nor B

Question: In saturated gas, the__________________?

• 1. Vapour is in equilibrium with the liquid at the gas temperature
• 2. Vapour is in equilibrium with the liquid at the room temperature
• 3. Partial pressure of vapour equals the vapour pressure of the liquid at room temperature
• 4. None of these

Question: In a counter-current extractor, as the axial mixing increases, the extraction efficiency______________________?

• 1. Increases
• 2. Decreases
• 3. Remains unchanged
• 4. Depends on the pressure of the system