Chemical Process Calculation Multiple Choice Questions & Answers (MCQs) focuses on “Humidity – Terminology”.
1. The ratio of partial pressure of the vapour in the gas mixture and the vapour pressure of the vapour component is called
a) Relative Humidity
b) Humidity
c) Dry air pressure
d) None of the mentioned
Answer: a
Clarification: The ratio of partial pressure of the vapour in the gas mixture and the vapour pressure of the vapour component is called Relative Humidity.
2-3. Announcement is made on radio that the temperature is 25 degree Celsius and the relative humidity is 65%.
2. What is the value of p(H2O)/p*(H2O)?
a) 0.45
b) 0.65
c) 0.85
d) None of the mentioned
Answer: b
Clarification: p(H2O)/p*(H2O) = %R.H./100.
3. Measurements of p(H2O) & p*(H2O) have been made at 25 degree celsius.
The above given statement is
a) Incorrect
b) Correct
c) Depends on other conditions as well
d) None of the mentioned
Answer:b
Clarification: Measurements of p(H2O) & p*(H2O) have been made at 25 degree celsius.
4. Zero percent relative saturation means
a) 100 % vapour in the air
b) 75% vapour in the air
c) 50% vapour in the air
d) No vapour in the air
Answer: d
Clarification: Zero percent relative saturation means no vapour in the air.
5. When the partial pressure of the vapour in the gas is same as the vapour pressure of the substance. What is the relative saturation?
a) 0%
b) 50%
c) 100%
d) None of the mentioned
Answer: c
Clarification: 100% relative saturation means the partial pressure of the vapour in the gas is same as the vapour pressure of the substance.
6. The mass of water vapour per unit mass of bone dry air is called
a) Relative saturation
b) Relative Humidity
c) Humidity
d) None of the mentioned
Answer: c
Clarification: The mass of water vapour per unit mass of bone dry air is called Humidity.
7. The usual temperature of a gas or liquid is
a) Dry bulb temperature
b) Wet bulb temperature
c) Standard temperature
d) None of the mentioned
Answer: a
Clarification: The usual temperature of a gas or liquid is dry bulb temperature.
8. The temperature reaches at equilibrium for the vaporization of a small amount of water in to a large amount of air.
a) Dry bulb temperature
b) Wet bulb temperature
c) Standard temperature
d) None of the mentioned
Answer: b
Clarification: The temperature reach at equilibrium for the vaporization of a small amount of water in to a large amount of air is called wet bulb temperature.
9. The heat capacity of an air-water vapour mixture per mass of bone dry air is called humid heat.
The above given statement is
a) Correct
b) Incorrect
c) Partially correct
d) None of the mentioned
Answer: a
Clarification: The heat capacity of an air-water vapour mixture per mass of bone dry air is called Humid heat.
10. The volume of air including the water vapour per mass of bone dry air.
a) Humid volume
b) Critical volume
c) Standard volume
d) None of the mentioned