Process Calculations – Multiple Choice Questions (MCQs)

1. 49. What is a separator in a process flow diagram?

   • A. A unit operation that mixes different streams
   • B. A unit operation that removes heat
   • C. A unit operation that divides a stream into two or more streams with different compositions
   • D. A unit operation that initiates a chemical reaction

2. 50. What is a distillation column?

   • A. A unit operation used to separate components of a liquid mixture based on differences in boiling points
   • B. A unit operation used for mixing
   • C. A unit operation used for heating
   • D. A unit operation used for solids separation

3. 51. What is an absorber?

   • A. A unit operation used to remove a component from a gas stream by dissolving it in a liquid solvent
   • B. A unit operation for drying solids
   • C. A unit operation for separating solids from liquids
   • D. A unit operation for heat transfer

4. 52. What is a stripper?

   • A. A unit operation used to remove a volatile component from a liquid stream by contacting it with a gas or vapor
   • B. A unit operation for concentrating solutions
   • C. A unit operation for filtering
   • D. A unit operation for crystallization

5. 53. What is a heat exchanger?

   • A. A device used to transfer heat between two or more fluids
   • B. A device used for chemical reactions
   • C. A device used for separating components
   • D. A device used for mixing

6. 54. What is specific volume?

   • A. Mass per unit volume
   • B. Volume per unit mass
   • C. Density per unit mass
   • D. Volume per unit area

7. 55. What is standard temperature and pressure (STP)?

   • A. 0°C and 1 atm
   • B. 25°C and 1 atm
   • C. 0°C and 100 kPa
   • D. 25°C and 100 kPa

8. 56. What is standard ambient temperature and pressure (SATP)?

   • A. 0°C and 1 atm
   • B. 25°C and 1 atm
   • C. 0°C and 100 kPa
   • D. 25°C and 100 kPa

9. 57. What is a psychrometric ratio?

   • A. Ratio of heat transfer coefficient to mass transfer coefficient
   • B. Ratio of dry-bulb to wet-bulb temperature
   • C. Ratio of specific heats
   • D. Ratio of latent heat to sensible heat

10. 58. What is the basis for the calculation of specific enthalpy using constant heat capacity?

    • A. ΔH = mCpΔT
    • B. ΔH = mΔT
    • C. ΔH = CpΔT
    • D. ΔH = mCp

11. 59. What is the general energy balance equation for an open system at steady state?

    • A. ΔH + ΔEk + ΔEp = Q - Ws
    • B. Q = Ws
    • C. ΔU = Q - W
    • D. ΔH = 0

12. 60. In the general energy balance, what does 'Q' represent?

    • A. Work done by the system
    • B. Heat added to the system
    • C. Internal energy
    • D. Enthalpy