# Separation Processes Questions and Answers – Psychrometry-2

This set of Separation Processes Multiple Choice Questions & Answers (MCQs) focuses on “Psychrometry-2”.

1. If the absolute humidity is 0.03
The mass of moisture free air is 50g
The mass of moisture is 25g
What is the molal humidity?
a) 0.03
b) 0.06
c) 0.04
d) 0.1

Explanation: Combining the formula of absolute humidity H= Mpa/Mb(p-pa) and molal humidity Hm=pa/p=pa, Hm= H*Ma/Mb=0.06.

2. If the absolute humidity is 0.02
The mass of moisture free air is 50g
The mass of moisture is 25g
What is the molal humidity?
a) 0.03
b) 0.06
c) 0.04
d) 0.1

Explanation: Combining the formula of absolute humidity H= Mpa/Mb(p-pa) and molal humidity Hm=pa/p=pa, Hm= H*Ma/Mb=0.04.

3. If the absolute humidity is 0.02
The mass of moisture free air is 50g
The mass of moisture is 10g
What is the molal humidity?
a) 0.03
b) 0.06
c) 0.04
d) 0.1

Explanation: Combining the formula of absolute humidity H= Mpa/Mb(p-pa) and molal humidity Hm=pa/p=pa, Hm= H*Ma/Mb=0.1.

4. If the absolute humidity is 0.03
The mass of moisture free air is 75g
The mass of moisture is 25g
What is the molal humidity?
a) 0.08
b) 0.15
c) 0.09
d) 0.21

Explanation: Combining the formula of absolute humidity H= Mpa/Mb(p-pa) and molal humidity Hm=pa/p=pa, Hm= H*Ma/Mb=0.09.

5. If the absolute humidity is 0.07
The mass of moisture free air is 48g
The mass of moisture is 16g
What is the molal humidity?
a) 0.08
b) 0.15
c) 0.09
d) 0.21

Explanation: Combining the formula of absolute humidity H= Mpa/Mb(p-pa) and molal humidity Hm=pa/p=pa, Hm= H*Ma/Mb=0.21.

6. If the absolute humidity is 0.075
The mass of moisture free air is 50g
The mass of moisture is 25g
What is the molal humidity?
a) 0.08
b) 0.15
c) 0.09
d) 0.21

Explanation: Combining the formula of absolute humidity H= Mpa/Mb(p-pa) and molal humidity Hm=pa/p=pa, Hm= H*Ma/Mb=0.15.

7. If the absolute humidity is 0.04
The mass of moisture free air is 50g
The mass of moisture is 25g
What is the molal humidity?
a) 0.08
b) 0.15
c) 0.09
d) 0.21

Explanation: Combining the formula of absolute humidity H= Mpa/Mb(p-pa) and molal humidity Hm=pa/p=pa, Hm= H*Ma/Mb=0.08.

8. If the absolute humidity is 0.03
The mass of moisture free air is 40g
The mass of moisture is 10g
What is the molal humidity?
a) 0.08
b) 0.15
c) 0.12
d) 0.21

Explanation: Combining the formula of absolute humidity H= Mpa/Mb(p-pa) and molal humidity Hm=pa/p=pa, Hm= H*Ma/Mb=0.12.

9. If the absolute humidity is 0.08
The mass of moisture free air is 50g
The mass of moisture is 12.5g
What is the molal humidity?
a) 0.08
b) 0.02
c) 0.32
d) 0.76

Explanation: Combining the formula of absolute humidity H= Mpa/Mb(p-pa) and molal humidity Hm=pa/p=pa, Hm= H*Ma/Mb=0.32.

10. If the absolute humidity is 0.06
The mass of moisture free air is 50g
The mass of moisture is 25g
What is the molal humidity?
a) 0.33
b) 0.12
c) 0.14
d) 0.18

Explanation: Combining the formula of absolute humidity H= Mpa/Mb(p-pa) and molal humidity Hm=pa/p=pa, Hm= H*Ma/Mb=0.12.

Sanfoundry Global Education & Learning Series – Separation Processes.

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