INTERVIEW BASED QUESTIONS PART-03
INTERVIEW BASED QUETIONS (PART-03)
1. Define: Absolute Viscosity, Kinematic Viscosity, Thermal Conductivity, Heat Capacity, and Heat Transfer.
→ Absolute(Dynamic/shear) Viscosity: -The resistance offered by a fluid under a shear stress.
Unit: - Kg(M.S) and Poise.
→ Kinematic Viscosity: -It’s the ratio of the viscosity of the fluid to it density.
Unit: - 1 Stoke =1 Cm2S and M2S
→ Thermal Conductivity: - Thermal conductivity is a measurement of the ability of a substance to conduct heat.
Unit: - W/(M.K) , J/(Sec.m.K)
→ Heat Capacity: - The amount of heat needed to rise the system’s temperature by one degree.
Unit: -JK
→ Heat transfer: - Amount of heat transfer per unit area per unit time.
Unit: -W/(M2.K) and J/(M2.S.K)
2. Define the Specific Heat.
→Specific Heat: - The amount of heat required for rise one degree temperature per unit mass.
Unit: - J(Kg.K)
3. Difference between drying and evaporation.
→
4. Name any four dryers along with one application in each case.
→1. Tray Dryer:-used in dyes and pharmaceuticals industry.
→2. Spray Dryer:-used in detergent and food industry.
→3. Fluidized Bed Dryer (FBD): - used in pharmaceuticals industry.
→4. Rotary Dryer:-Cement industry.
→5. Roto Cone Vacuum Dryer(RCVD):-Pharmaceuticals industry.
5. Which types of evaporator used in concentrating fruit juice.
→Multiple effect evaporator
6. Write difference between single effect and multiple effect evaporator.
→ In multiple effect evaporator vapour coming out from 1st evaporator is use as feed for 2nd evaporator. While in single effect evaporator vapour coming out from evaporator is going to condenser and discard.
→ Cost of multiple effect evaporator is higher than single effect evaporator.
→ Multiple effect evaporator is use in large scale operation.
7. Write difference between Forward feed and Backward feed evaporation.
→
Forward Feed Evaporator | Backward Feed evaporator |
-Flow of solution and steam is in parallel direction. | -Flow of solution and steam is in counter current direction. |
-It’s not required pump. | -It’s required pump. |
-In this process heating of feed in first effect. | -In this process heating of feed in each effect. |
-maintenance charge and power costs is less. | -maintenance charge and power costs is high. |
-Get less thick liquor. | -Get thick liquor. |
8. Define Humidity. Write the name of one equipment use for measuring humidity.
→ Humidity is the amount of water vapour in the air.
→Relative Humidity: - It’s the ratio of the amount of moisture in the air to the maximum amount of moisture that could exist in the air at a specific temperature.
→Specific Humidity: - It’s the ratio of the mass of moisture in the mixture to mass of moisture in air.
→Measuring equipment: - Hydrometer
→Hydrometer: -A hydrometer is an instrument that measure the specific gravity (relative density) of liquid.
9. Give Boiling Point of ….
→
Methanol | 64.7° C |
Ethanol | 78.3° C |
Benzene | 80.1° C |
Toluene | 110.6° C |
Isopropyl alcohol | 82.6 °C |
Ethyl acetate | 77.1° C |
10. Write the name of strong acid and strong base.
→
Strong Acid | Strong Base |
HClO4 - Perchloric Acid | NaOH - Sodium Hydroxide |
HCl - Hydrochloric Acid | KOH – Potassium Hydroxide |
H2SO4- Sulfuric Acid | Ca(OH)2 - Calcium Hydroxide |
HNO3 - Nitric Acid | Ba(OH)2 – Barium Hydroxide |
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