55 + Mcqs in Humidity Charts Page 1 McqOptions

1.	What is added to the moist air in the combustion process?
A.	Water
B.	Carbon dioxide
C.	Oxygen
D.	None of the mentioned
Answer» B. Carbon dioxide

Discussion

2.	What is the work of drying process?
A.	Decreases the moisture content
B.	Vaporizes water
C.	Increases the moisture content
D.	None of the mentioned
Answer» B. Vaporizes water

Discussion

3.	What is the enthalpy change of 10oC system if the heat capacity of air at 20oC is 5 J/oC and heat capacity of water vapor at 20oC is 15 J/oC, enthalpy of vaporization is 10 J, and the humidity is 40%?
A.	58 J
B.	84 J
C.	114 J
D.	135 J
Answer» D. 135 J

Discussion

4.	What is the temperature of the point of intersection of adiabatic cooling line and specific humid volume line?
A.	Wet-bulb temperature
B.	Dry-bulb temperature
C.	Dew point temperature
D.	None of the mentioned
Answer» C. Dew point temperature

Discussion

5.	What is the enthalpy change of the mixture if the enthalpy change of air is 10 J, enthalpy change of water vapor is 15 J, and the humidity is 40%?
A.	10 J
B.	12 J
C.	14 J
D.	16 J
Answer» E.

Discussion

6.	What is the enthalpy change of 15oC system if the heat capacity of air at 20oC is 10 J/oC and heat capacity of water vapor at 20oC is 20 J/oC, enthalpy of vaporization is 20 J, and the humidity is 50%?
A.	50 J
B.	60 J
C.	80 J
D.	110 J
Answer» E.

Discussion

7.	What is the work of the humidification process?
A.	Vaporization
B.	Freezing
C.	Condensing
D.	None of the mentioned
Answer» B. Freezing

Discussion

8.	What is the enthalpy change of 30oC system if the heat capacity of air at 38oC is 5 J/oC and heat capacity of water vapor at 38oC is 10 J/oC, enthalpy of vaporization is 10 J, and the humidity is 60%?
A.	14 J
B.	39 J
C.	65 J
D.	94 J
Answer» E.

Discussion

9.	What is the enthalpy change of 20oC system if the heat capacity of air at 25oC is 5 J/oC and heat capacity of water vapor at 25oC is 10 J/oC, enthalpy of vaporization is 10 J, and the humidity is 20%?
A.	25 J
B.	37 J
C.	44 J
D.	51 J
Answer» C. 44 J

Discussion

10.	In condensation, moist air is cooled below its which temperature?
A.	Dew-point temperature
B.	Dry-bulb temperature
C.	Wet-bulb temperature
D.	Saturation temperature
Answer» E.

Discussion

11.	What is the specific humidity, if pressure of water is 2 atm and total pressure is 12 atm?
A.	0.2
B.	0.4
C.	0.5
D.	0.8
Answer» E.

Discussion

12.	What is the humid volume of the system at 100oF with humidity 20%?
A.	18.6 ft3/lb
B.	22.4 ft3/lb
C.	26.5 ft3/lb
D.	29.4 ft3/lb
Answer» B. 22.4 ft3/lb

Discussion

13.	What is the humid heat of a mixture of air (CP = 10 J) with water vapor (CP = 15 J), if the humidity is 40%?
A.	16 J
B.	20 J
C.	24 J
D.	32 J
Answer» B. 20 J

Discussion

14.	What is the humid heat of a mixture of air (CP = 10 J) with water vapor (CP = 25 J), if the humidity is 20%?
A.	15 J
B.	20 J
C.	25 J
D.	30 J
Answer» B. 20 J

Discussion

15.	What is the humid heat of a mixture of air (CP = 10 J) with water vapor (CP = 15 J), if the humidity is 60%?
A.	10 J
B.	14 J
C.	19 J
D.	23 J
Answer» D. 23 J

Discussion

16.	Which of the following is the summation of a volume of 1 Kg of dry air and the water vapor in the air?
A.	Humid volume
B.	Partial volume
C.	Dry volume
D.	None of the mentioned
Answer» B. Partial volume

Discussion

17.	What is the computer code used in flow sheeting?
A.	Process simulator
B.	Process settler
C.	Process developer
D.	All of the mentioned
Answer» B. Process settler

Discussion

18.	Which of the following is not found in process simulators?
A.	Heat exchangers
B.	Compressors
C.	Splitters
D.	None of the mentioned
Answer» E.

Discussion

19.	What are the number of equations associated with 4 process stream, if the number of species in the stream are 2?
A.	4
B.	8
C.	16
D.	24
Answer» D. 24

Discussion

20.	What are the number of variables associated with a process stream, if the number of species in the stream are 5?
A.	1
B.	3
C.	5
D.	7
Answer» E.

Discussion

21.	What is the number of compositions associated with a process stream, if the number of species in the stream is 4?
A.	1
B.	2
C.	3
D.	4
Answer» D. 4

Discussion

22.	What are the number of equations associated with 3 process stream, if the number of species in the stream are 2?
A.	3
B.	4
C.	6
D.	12
Answer» E.

Discussion

23.	What are the solution of appropriate process material and energy balances?
A.	Flow sheeting
B.	Flow processing
C.	Flow Solving
D.	None of the mentioned
Answer» B. Flow processing

Discussion

24.	What are the number of equations associated with 2 process stream, if the number of species in the stream are 3?
A.	2
B.	3
C.	5
D.	10
Answer» E.

Discussion

25.	What is the fundamental of the flow sheeting codes?
A.	Calculation of mass balance
B.	Calculation of momentum balance
C.	Calculation of force balance
D.	All of the mentioned
Answer» B. Calculation of momentum balance

Discussion

26.	Enthalpy of air is 15 J and enthalpy of water vapor is 20 J, if the total enthalpy of the system is 20 J, what is the humidity of the system?
A.	0.25
B.	0.5
C.	0.75
D.	1
Answer» B. 0.5

Discussion

27.	Enthalpy of air is 5 J and enthalpy of water vapor is 10 J, if the total enthalpy of the system is 25 J, what is the humidity of the system?
A.	0.5
B.	1
C.	1.5
D.	2
Answer» E.

Discussion

28.	Enthalpy of air is 10 J and enthalpy of water vapor is 15 J, if the total enthalpy of the system is 25 J, what is the humidity of the system?
A.	0.2
B.	0.5
C.	1
D.	1.8
Answer» D. 1.8

Discussion

29.	The humidity at dry-bulb temperature of 20oC is 40% and the humidity at dry-bulb temperature of 25oC is 25%, what is the slope of adiabatic cooling line?
A.	0.03
B.	-0.03
C.	0.05
D.	-0.05
Answer» C. 0.05

Discussion

30.	Enthalpy of air is 15 J and enthalpy of water vapor is 20 J, if the total enthalpy of the system is 25 J, what is the humidity of the system?
A.	0.1
B.	0.5
C.	1
D.	2
Answer» C. 1

Discussion

31.	Enthalpy of air is 20 J and enthalpy of water vapor is 6 J, if the total enthalpy of the system is 23 J, what is the humidity of the system?
A.	0.1
B.	0.2
C.	0.4
D.	0.5
Answer» E.

Discussion

32.	In air conditioning process, what has to be done first to the moist air?
A.	Heating
B.	Cooling
C.	Heating & Cooling
D.	None of mentioned
Answer» B. Cooling

Discussion

33.	The humidity at dry-bulb temperature of 23oC is 30% and the humidity at dry-bulb temperature of 28oC is 25%, what is the slope of adiabatic cooling line?
A.	-0.01
B.	-0.02
C.	-0.03
D.	-0.05
Answer» B. -0.02

Discussion

34.	The humidity at dry-bulb temperature of 20oC is 10% and the humidity at dry-bulb temperature of 23oC is 4%, what is the slope of adiabatic cooling line?
A.	-0.01
B.	-0.02
C.	-0.03
D.	-0.05
Answer» C. -0.03

Discussion

35.	The humidity at dry-bulb temperature of 20oC is 30% and the humidity at dry-bulb temperature of 22oC is 24%, what is the slope of adiabatic cooling line?
A.	-0.01
B.	-0.02
C.	-0.03
D.	-0.05
Answer» D. -0.05

Discussion

36.	What are the number of degrees of freedom if the number of variables and number of equations are 15 and 10 respectively?
A.	5
B.	10
C.	15
D.	25
Answer» B. 10

Discussion

37.	What are the number of degrees of freedom if the number of variables and number of equations are 15 and 5 respectively?
A.	5
B.	10
C.	15
D.	20
Answer» C. 15

Discussion

38.	What are the number of degrees of freedom if the number of variables and number of equations are 18 and 7 respectively?
A.	7
B.	9
C.	11
D.	15
Answer» D. 15

Discussion

39.	What are the number of compositions associated with a process stream, if the number of species in the stream are 2?
A.	1
B.	2
C.	3
D.	4
Answer» B. 2

Discussion

40.	What are the number of degrees of freedom if the number of variables and number of equations are 21 and 9 respectively?
A.	7
B.	9
C.	10
D.	12
Answer» E.

Discussion

41.	Degrees of freedom calculation treat which kind of variables?
A.	Intensive
B.	Extensive
C.	Both
D.	None of the mentioned
Answer» B. Extensive

Discussion

42.	What are the number of variables associated with a process stream, if the number of species in the stream are 2?
A.	1
B.	2
C.	3
D.	4
Answer» E.

Discussion

43.	Which of the following cannot be treated as a variable for degrees of freedom calculation?
A.	Temperature
B.	Pressure
C.	Volume
D.	Work
Answer» D. Work

Discussion

44.	The humidity at dry-bulb temperature of 20oC is 12% and the humidity at dry-bulb temperature of 23oC is 3%, what is the slope of adiabatic cooling line?
A.	-0.01
B.	-0.02
C.	-0.03
D.	-0.05
Answer» D. -0.05

Discussion

45.	What are the number of degrees of freedom if the number of variables and number of equations are 10 and 8 respectively?
A.	2
B.	8
C.	10
D.	18
Answer» B. 8

Discussion

46.	The input mass in a process simulator is 5 Kg, what will be the output mass?
A.	0
B.	5 Kg
C.	8 Kg
D.	10 Kg
Answer» C. 8 Kg

Discussion

47.	The feed of a process simulator is 2 mole with enthalpy 4 J/mole, the heat input is 6 J, and the work performed is 10 J, what will be the product enthalpy if a mole of the product are 2?
A.	1 J/mole
B.	2 J/mole
C.	3 J/mole
D.	5 J/mole
Answer» C. 3 J/mole

Discussion

48.	The feed of a process simulator is 5 mole with enthalpy 3 J/mole, the heat input is 15 J, and the work performed is 20 J, what will be the product enthalpy if a mole of the product are 2?
A.	1 J/mole
B.	2 J/mole
C.	3 J/mole
D.	5 J/mole
Answer» E.

Discussion

49.	The input mass in a process simulator is 10 Kg, what will be the output mass?
A.	0
B.	5 Kg
C.	8 Kg
D.	10 Kg
Answer» E.

Discussion

50.	The feed of a process simulator is 10 mole with enthalpy 2 J/mole, the heat input is 15 J, and the work performed is 10 J, what will be the product enthalpy if mole of the product are 5?
A.	2 J/mole
B.	3 J/mole
C.	4 J/mole
D.	5 J/mole
Answer» E.

Discussion

Explore topic-wise MCQs in Chemical Engineering.

What is added to the moist air in the combustion process?

What is the work of drying process?

What is the enthalpy change of 10oC system if the heat capacity of air at 20oC is 5 J/oC and heat capacity of water vapor at 20oC is 15 J/oC, enthalpy of vaporization is 10 J, and the humidity is 40%?

What is the temperature of the point of intersection of adiabatic cooling line and specific humid volume line?

What is the enthalpy change of the mixture if the enthalpy change of air is 10 J, enthalpy change of water vapor is 15 J, and the humidity is 40%?

What is the enthalpy change of 15oC system if the heat capacity of air at 20oC is 10 J/oC and heat capacity of water vapor at 20oC is 20 J/oC, enthalpy of vaporization is 20 J, and the humidity is 50%?

What is the work of the humidification process?

What is the enthalpy change of 30oC system if the heat capacity of air at 38oC is 5 J/oC and heat capacity of water vapor at 38oC is 10 J/oC, enthalpy of vaporization is 10 J, and the humidity is 60%?

What is the enthalpy change of 20oC system if the heat capacity of air at 25oC is 5 J/oC and heat capacity of water vapor at 25oC is 10 J/oC, enthalpy of vaporization is 10 J, and the humidity is 20%?

In condensation, moist air is cooled below its which temperature?

What is the specific humidity, if pressure of water is 2 atm and total pressure is 12 atm?

What is the humid volume of the system at 100oF with humidity 20%?

What is the humid heat of a mixture of air (CP = 10 J) with water vapor (CP = 15 J), if the humidity is 40%?

What is the humid heat of a mixture of air (CP = 10 J) with water vapor (CP = 25 J), if the humidity is 20%?

What is the humid heat of a mixture of air (CP = 10 J) with water vapor (CP = 15 J), if the humidity is 60%?

Which of the following is the summation of a volume of 1 Kg of dry air and the water vapor in the air?

What is the computer code used in flow sheeting?

Which of the following is not found in process simulators?

What are the number of equations associated with 4 process stream, if the number of species in the stream are 2?

What are the number of variables associated with a process stream, if the number of species in the stream are 5?

What is the number of compositions associated with a process stream, if the number of species in the stream is 4?

What are the number of equations associated with 3 process stream, if the number of species in the stream are 2?

What are the solution of appropriate process material and energy balances?

What are the number of equations associated with 2 process stream, if the number of species in the stream are 3?

What is the fundamental of the flow sheeting codes?

Enthalpy of air is 15 J and enthalpy of water vapor is 20 J, if the total enthalpy of the system is 20 J, what is the humidity of the system?

Enthalpy of air is 5 J and enthalpy of water vapor is 10 J, if the total enthalpy of the system is 25 J, what is the humidity of the system?

Enthalpy of air is 10 J and enthalpy of water vapor is 15 J, if the total enthalpy of the system is 25 J, what is the humidity of the system?

The humidity at dry-bulb temperature of 20oC is 40% and the humidity at dry-bulb temperature of 25oC is 25%, what is the slope of adiabatic cooling line?

Enthalpy of air is 15 J and enthalpy of water vapor is 20 J, if the total enthalpy of the system is 25 J, what is the humidity of the system?

Enthalpy of air is 20 J and enthalpy of water vapor is 6 J, if the total enthalpy of the system is 23 J, what is the humidity of the system?

In air conditioning process, what has to be done first to the moist air?

The humidity at dry-bulb temperature of 23oC is 30% and the humidity at dry-bulb temperature of 28oC is 25%, what is the slope of adiabatic cooling line?

The humidity at dry-bulb temperature of 20oC is 10% and the humidity at dry-bulb temperature of 23oC is 4%, what is the slope of adiabatic cooling line?

The humidity at dry-bulb temperature of 20oC is 30% and the humidity at dry-bulb temperature of 22oC is 24%, what is the slope of adiabatic cooling line?

What are the number of degrees of freedom if the number of variables and number of equations are 15 and 10 respectively?

What are the number of degrees of freedom if the number of variables and number of equations are 15 and 5 respectively?

What are the number of degrees of freedom if the number of variables and number of equations are 18 and 7 respectively?

What are the number of compositions associated with a process stream, if the number of species in the stream are 2?

What are the number of degrees of freedom if the number of variables and number of equations are 21 and 9 respectively?

Degrees of freedom calculation treat which kind of variables?

What are the number of variables associated with a process stream, if the number of species in the stream are 2?

Which of the following cannot be treated as a variable for degrees of freedom calculation?

The humidity at dry-bulb temperature of 20oC is 12% and the humidity at dry-bulb temperature of 23oC is 3%, what is the slope of adiabatic cooling line?

What are the number of degrees of freedom if the number of variables and number of equations are 10 and 8 respectively?

The input mass in a process simulator is 5 Kg, what will be the output mass?

The feed of a process simulator is 2 mole with enthalpy 4 J/mole, the heat input is 6 J, and the work performed is 10 J, what will be the product enthalpy if a mole of the product are 2?

The feed of a process simulator is 5 mole with enthalpy 3 J/mole, the heat input is 15 J, and the work performed is 20 J, what will be the product enthalpy if a mole of the product are 2?

The input mass in a process simulator is 10 Kg, what will be the output mass?

The feed of a process simulator is 10 mole with enthalpy 2 J/mole, the heat input is 15 J, and the work performed is 10 J, what will be the product enthalpy if mole of the product are 5?