# Separation Processes Questions and Answers – Psychrometry

This set of Separation Processes Multiple Choice Questions & Answers (MCQs) focuses on “Psychrometry”.

1. What does the term absolute humidity mean?
a) Moisture content of a gas by mass
b) Moisture content of a gas by moles
c) Ratio of humidity to humidity at saturation
d) Temperature at which moisture begins to condense when it is cooled

Explanation: The term absolute humidity or mass humidity means the moisture content of a gas by mass. It is expressed as the ratio of Mass of water multiplies by partial pressure of water to the mass of air multiplied by remaining pressure.

2. What does the term molal humidity mean?
a) Moisture content of a gas by mass
b) Moisture content of a gas by moles
c) Ratio of humidity to humidity at saturation
d) Temperature at which moisture begins to condense when it is cooled

Explanation: The term molal humidity means the moisture content of a gas by mass. It is expressed as the ratio of partial pressure of water to remaining pressure.

3. What does the term percent saturation mean?
a) Moisture content of a gas by mass
b) Moisture content of a gas by moles
c) Ratio of humidity to humidity at saturation
d) Temperature at which moisture begins to condense when it is cooled

Explanation: The term percent saturation refers to ratio of humidity to humidity at saturation.

4. What does the term dew-point temperature mean?
a) Moisture content of a gas by mass
b) Moisture content of a gas by moles
c) Ratio of humidity to humidity at saturation
d) Temperature at which moisture begins to condense when it is cooled

Explanation: The term dew point temperature refers to the temperature at which moisture begins to condense when it is cooled.

5. What does the term humid volume refer to?
a) Specific heat of moisture gas mixture per unit mass of moisture free gas
b) Volume of moisture gas mixture per unit mass of moisture free gas
c) Enthalpy of moisture gas mixture per unit mass of moisture free gas
d) Temperature attained when a gas is saturated with moisture in an adiabatic process

Explanation: The term humid volume means the volume of moisture gas mixture per unit mass of moisture free gas.

6. What does the term humid heat refer to?
a) Specific heat of moisture gas mixture per unit mass of moisture free gas
b) Volume of moisture gas mixture per unit mass of moisture free gas
c) Enthalpy of moisture gas mixture per unit mass of moisture free gas
d) Temperature attained when a gas is saturated with moisture in an adiabatic process

Explanation: The term humid heat means the heat of moisture gas mixture per unit mass of moisture free gas.

7. What does the term total enthalpy refer to?
a) Specific heat of moisture gas mixture per unit mass of moisture free gas
b) Volume of moisture gas mixture per unit mass of moisture free gas
c) Enthalpy of moisture gas mixture per unit mass of moisture free gas
d) Temperature attained when a gas is saturated with moisture in an adiabatic process

Explanation: The term total enthalpy means the enthalpy of moisture gas mixture per unit mass of moisture free gas.

8. What does the term adiabatic saturation temperature refer to?
a) Specific heat of moisture gas mixture per unit mass of moisture free gas
b) Volume of moisture gas mixture per unit mass of moisture free gas
c) Enthalpy of moisture gas mixture per unit mass of moisture free gas
d) Temperature attained when a gas is saturated with moisture in an adiabatic process

Explanation: The term adiabatic saturation temperature means the temperature attained when a gas is saturated with moisture in an adiabatic process.

9. What does dry bulb temperature mean?
a) Temperature of mixture
b) Steady state temperature attained by a wet bulb thermometer
c) Temperature attained when a gas is saturated with moisture in an adiabatic process
d) The temperature of air having no moisture

Explanation: Dry bulb temperature means the temperature of the mixture.

10. What does wet bulb temperature mean?
a) Temperature of mixture
b) Steady state temperature attained by a wet bulb thermometer
c) Temperature attained when a gas is saturated with moisture in an adiabatic process
d) The temperature of air having no moisture

Explanation: Wet bulb temperature means the steady state temperature attained by a wet bulb thermometer.

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