209 + Mcqs in Species Material Balances Page 3 McqOptions

101.	What is the accumulation in the system after 10 second if the out flow and in flow rates are 10 g/s and 15 g/s?
A.	5 g
B.	10 g
C.	50 g
D.	100 g
Answer» D. 100 g

Discussion

102.	What amount of 57 octane should be mixed with 3 liters of 63 octane to obtain 4 liters of 59 octane?
A.	1 liter
B.	2 liters
C.	2.5 liters
D.	4.5 liters
Answer» E.

Discussion

103.	The human body is an example of which of the following?
A.	Closed System
B.	Open System
C.	Isolated System
D.	None of the mentioned
Answer» C. Isolated System

Discussion

104.	Feed of a reactor has 0.75 mass fraction of O₂ and some SO₂, if the product rate is 1000 Kg/hr then what is the rate of SO₂ in the feed?
A.	100 Kg/hr
B.	250 Kg/hr
C.	750 Kg/hr
D.	1000 Kg/hr
Answer» C. 750 Kg/hr

Discussion

105.	A reactor has feed from 2 streams, one with rate 10 Kg/hr and other with 30 Kg/hr, and product side also has 2 streams one of which is at the rate of 15 Kg/hr, what is the rate of other product stream?
A.	5 Kg/hr
B.	15 Kg/hr
C.	25 Kg/hr
D.	35 Kg/hr
Answer» D. 35 Kg/hr

Discussion

106.	A reactor has feed of two streams, stream 1 has CO₂ and H₂O with mass fraction of 0.4 and 0.6 and rate 10 kg/hr, and stream 2 has CO₂ and H₂O with mass fraction 0.1 and 0.9 and rate 40 Kg/hr, what the mass fraction of CO₂ in the product stream?
A.	0.08
B.	0.16
C.	0.24
D.	0.32
Answer» C. 0.24

Discussion

107.	An unsteady state system, the flow in rate of A is 5 mole/s, what is the flow out rate of B if the accumulation was 10 mole in 5 seconds?
A.	1 mole/s
B.	2 mole/s
C.	3 mole/s
D.	5 mole/s
Answer» D. 5 mole/s

Discussion

108.	10 moles of A were present in a system initially, and 10 moles of C are added to it, it follows the reaction 2A + C -> 5B, what are number of moles of B produced?
A.	5
B.	10
C.	25
D.	50
Answer» D. 50

Discussion

109.	A reaction has reactants 2 moles of NaOH and 1 mole of H₂SO₄, and products Na₂SO₄ and H₂O, what are the total moles of products?
A.	1
B.	2
C.	3
D.	4
Answer» D. 4

Discussion

110.	In a random reaction 2 mole of CH₄ and 1 mole of C₂H₄ are reacted, and 1 mole of C₃H₈ and 1 mole of CxHy are produced, what is x*y?
A.	2
B.	4
C.	8
D.	12
Answer» C. 8

Discussion

111.	An unsteady state system, the flow in rate of A is 8 mole/s, what is the flow out rate of B if the accumulation was 6 mole in 2 seconds?
A.	1 mole/s
B.	2 mole/s
C.	3 mole/s
D.	5 mole/s
Answer» E.

Discussion

112.	A reactor is supplied with C₆H₁₂O₆ and the following reactions occur C₆H₁₂O₆ -> 2C₂H₅OH + 2CO₂ and C₆H₁₂O₆ –> 2C₂H₃CO₂H + 2H₂O, 360 grams of pure glucose is supplied and 44 grams of CO₂ was produced, what 90 grams of glucose left unreacted, how many grams of propenoic acid was produced?
A.	18
B.	36
C.	72
D.	144
Answer» E.

Discussion

113.	Solution-1 containing 10% nitric acid flowing at the rate 10 Kg/min combines with Solution-2 containing 40% nitric acid flowing at the rate 5 Kg/min, if their product contains 30% nitric acid, what is the flow rate of product?
A.	10 Kg/min
B.	20 Kg/min
C.	30 Kg/min
D.	40 Kg/min
Answer» B. 20 Kg/min

Discussion

114.	10 moles of A were present in a system initially, and 10 moles are added to it, it follows the reaction 4A -> B, what are number of moles of B produced?
A.	5
B.	10
C.	15
D.	20
Answer» B. 10

Discussion

115.	How is the boundary wall of a closed system?
A.	Impermeable
B.	Permeable
C.	Rigid
D.	None of the mentioned
Answer» B. Permeable

Discussion

116.	The flow in rate of A is 8 mole/s, it undergoes a reaction 3A -> B, what are the moles of B that comes out after 6 seconds?
A.	5
B.	8
C.	10
D.	16
Answer» E.

Discussion

117.	8 moles of A were present in a system initially, and 24 moles of B are added to it, it undergoes the reaction 2A + 3B -> 4C + 5D, what are number of moles of D produced?
A.	10
B.	20
C.	30
D.	40
Answer» D. 40

Discussion

118.	A reactor is supplied with 5 moles each of CH₃OH and O₂, and the following reactions occur, CH₃OH + 1/2O₂ -> CH₂O + H₂O and then CH₂O + 1/2O₂ -> CO + H₂O, the conversion of methanol is 80% in first reaction, and conversion of CH₂O is 50% in second reaction. How many moles of O₂ are there in the products?
A.	1.75
B.	2
C.	3.25
D.	5.5
Answer» B. 2

Discussion

119.	A reactor is supplied with 20 moles of C, and it undergoes following reactions C + 0.5O₂ -> CO and C + O₂ -> CO₂, if 10 moles of CO₂ was produced and 5 moles of C remains unreacted, what are the number of moles of CO produced?
A.	1
B.	3
C.	5
D.	7
Answer» D. 7

Discussion

120.	The rate of flow in stream with 20% CH₄ and 80% H₂O is 5 mole/hr, the contained was initially filled with 3 mole of H₂O, what will be the percentage of CH₄ in product stream?
A.	5
B.	12.5
C.	25
D.	37.5
Answer» C. 25

Discussion

121.	A reactor is supplied with 25 moles of C, and it undergoes following reactions C + 0.5O₂ -> CO and C + O₂ -> CO₂, if 13 moles of CO₂ was produced and 5 moles of C remains unreacted, what are the number of moles of CO produced?
A.	1
B.	3
C.	5
D.	7
Answer» E.

Discussion

122.	An unsteady state system, the flow in rate of A is 6 mole/s, what is the flow out rate of B if the accumulation was 18 mole in 9 seconds?
A.	1 mole/s
B.	2 mole/s
C.	3 mole/s
D.	4 mole/s
Answer» E.

Discussion

123.	Ethane is supplied with chlorine in a reactor, how many independent element balances can you write?
A.	1
B.	2
C.	3
D.	4
Answer» D. 4

Discussion

124.	Water flowing with chlorine concentration 10 mg/L at the rate of 20 Liter/min, is discharged into a river, if the concentration of chlorine in river is 5 mg/L what is the flow rate of river?
A.	10 Liter/min
B.	20 Liter/min
C.	30 Liter/min
D.	40 Liter/min
Answer» B. 20 Liter/min

Discussion

125.	A gas mixture input is given to a membrane with 20% O₂ and 80% N₂, the waste contains 60% of the input and the product contains 30% O₂ and 70% N₂, what are the number of moles of O₂ in the waste?
A.	1
B.	2
C.	3
D.	Can’t be determined
Answer» E.

Discussion

126.	Ethane is supplied at the rate F with oxygen at the rate W and leaves the following products CO₂, H₂O, O₂, C₂H₆ and H₂ at the rate P. How many independent element balances are possible?
A.	1
B.	2
C.	3
D.	4
Answer» D. 4

Discussion

127.	In a batch process, 5 mole of H₂ and 3 mole of CO₂ entered a vessel with some CO₂, if 10 mole of product leaves the vessel, what is the percentage of H₂ in the product?
A.	10%
B.	30%
C.	50%
D.	80%
Answer» D. 80%

Discussion

128.	What is the percentage of excess air if 50 grams of air is in excess and 150 grams of air enters the process?
A.	10%
B.	25%
C.	50%
D.	100%
Answer» D. 100%

Discussion

129.	Solution-1 containing 30% sulfuric acid flowing at the rate 10 Kg/min combines with Solution-2 containing 20% sulfuric acid flowing at the rate 5 Kg/min, if their product is out at the rate 20 Kg/min what is the percentage of sulfuric acid in the product?
A.	10%
B.	20%
C.	30%
D.	40%
Answer» C. 30%

Discussion

130.	Answer the following questions for the given diagram.What is the value of B?
A.	100 Kg/hr
B.	200 Kg/hr
C.	300 Kg/hr
D.	400 Kg/hr
Answer» C. 300 Kg/hr

Discussion

131.	A reaction is A + 2B -> 3C, if 2 moles of A and 4 moles of B entered the system, what are the number of moles of C formed?
A.	2
B.	4
C.	6
D.	8
Answer» D. 8

Discussion

132.	Solution-1 containing 30% acetic acid and 20% nitrogen at the rate F combines with Solution-2 containing 20% acetic acid and 10% nitrogen at the rate D and Solution-3 containing 10% acetic acid and 30% nitrogen at the rate N the product formed contains 20% acetic acid at the rate 10 Kg/min, what is the percentage of nitrogen in product?
A.	10%
B.	20%
C.	30%
D.	Cannot be determined
Answer» E.

Discussion

133.	octane is burnt with 40% excess O₂, what is the percentage of CO₂ in products?
A.	18.18%
B.	36.36%
C.	54.54%
D.	72.72%
Answer» C. 54.54%

Discussion

134.	10 moles of A were present in a system initially, and 8 moles of C are added to it, it undergoes the reaction 5A + 3C -> 4B, what are number of moles of B produced?
A.	4
B.	6
C.	8
D.	10
Answer» D. 10

Discussion

135.	How many independent equations are possible, if two components are involved in each of streams?
A.	1
B.	2
C.	3
D.	4
Answer» E.

Discussion

136.	A liquid solid mixture with 10% solid and 90% liquid is input to a dryer, some of the liquid evaporated and the product contains 60% solid and 40% liquid, what is the ratio of amount of water evaporated and amount of input?
A.	2:1
B.	3:2
C.	5:4
D.	6:5
Answer» E.

Discussion

137.	A reactor is supplied with 5 moles each of CH₃OH and O₂, and the following reactions occur, CH₃OH + 1/2O₂ -> CH₂O + H₂O and then CH₂O + 1/2O₂ -> CO + H₂O, the conversion of methanol is 80% in first reaction, and conversion of CH₂O is 50% in second reaction. How many moles of CH₂O came out of the reactor?
A.	1
B.	2
C.	3
D.	4
Answer» C. 3

Discussion

138.	Ethene is burnt with 50% of excess air, what is the percentage of CO₂ in the products?
A.	11.11%
B.	36.36%
C.	66.66%
D.	72.72%
Answer» C. 66.66%

Discussion

139.	Methane is at the rate 50 moles is supplied to a reactor with air at the rate 1000 moles, the reactor leaves O₂, N₂, CO₂ and H₂O, what is the percentage of H₂O in products?
A.	5.8%
B.	9.5%
C.	15.4%
D.	20.7%
Answer» C. 15.4%

Discussion

140.	Answer the following question for the diagram.What is the value of F?
A.	98.5 Kg/hr
B.	131.1 Kg/hr
C.	167.7 Kg/hr
D.	256.4 Kg/hr
Answer» D. 256.4 Kg/hr

Discussion

141.	An egg is an example of which of the following?
A.	Closed System
B.	Open System
C.	Isolated System
D.	None of the mentioned
Answer» B. Open System

Discussion

142.	A semi-batch process is that in which material enters the system and _____ which of the following should fill the gap?
A.	Leaves
B.	Does not leaves
C.	Half of it leaves
D.	None of the mentioned
Answer» C. Half of it leaves

Discussion

143.	An unsteady state system, the flow in rate of A is 12 mole/s, what is the flow out rate of B if the accumulation was 18 mole in 3 seconds?
A.	4 mole/s
B.	6 mole/s
C.	8 mole/s
D.	9 mole/s
Answer» C. 8 mole/s

Discussion

144.	Solution-1 containing 40% nitric acid and 20% carbon dioxide at the rate F combines with Solution-2 containing 30% nitric acid and 40% carbon dioxide at the rate D, the product formed contains 30% nitric acid and 20% carbon dioxide at the rate P, If P = xF what is x?
A.	1
B.	2
C.	3
D.	4
Answer» C. 3

Discussion

145.	A reactor is supplied with 6 moles of CO and 3 moles of O₂ and produced 4 moles of CO₂, what is the extent of reaction?
A.	1
B.	2
C.	3
D.	4
Answer» C. 3

Discussion

146.	The general material balance equation for reactive system is Accumulation = Input + Generation – x, what is x?
A.	Consumption – Output
B.	Consumption + Output
C.	Output – Consumption
D.	None of the mentioned
Answer» C. Output – Consumption

Discussion

147.	In what ratio 57 octane and 63 octane should be mixed to obtain 59 octane?
A.	1:1
B.	2:1
C.	3:1
D.	4:1
Answer» C. 3:1

Discussion

148.	What is the final amount of fluid in the vessel if the system is in steady state?
A.	Same as the initial amount
B.	Twice the initial amount
C.	Zero
D.	None of the mentioned
Answer» B. Twice the initial amount

Discussion

149.	An unsteady-state system, with 10 liters as initial amount of water in the vessel, water flow in rate is 8 liters/ s and flow out rate is 5 liters/s, what will be the amount of water in the vessel after 10 seconds?
A.	10 liters
B.	20 liters
C.	30 liters
D.	40 liters
Answer» E.

Discussion

150.	A reactor is supplied with a feed of composition 46% C₃H₇O₄, 44% O₂ and 10% N₂, if 50% of the limiting reagent is converted into product, what is the percentage of N₂ in the product?
A.	8
B.	18
C.	34
D.	46
Answer» B. 18

Discussion

Explore topic-wise MCQs in Chemical Engineering.

What is the accumulation in the system after 10 second if the out flow and in flow rates are 10 g/s and 15 g/s?

What amount of 57 octane should be mixed with 3 liters of 63 octane to obtain 4 liters of 59 octane?

The human body is an example of which of the following?

Feed of a reactor has 0.75 mass fraction of O₂ and some SO₂, if the product rate is 1000 Kg/hr then what is the rate of SO₂ in the feed?

A reactor has feed from 2 streams, one with rate 10 Kg/hr and other with 30 Kg/hr, and product side also has 2 streams one of which is at the rate of 15 Kg/hr, what is the rate of other product stream?

A reactor has feed of two streams, stream 1 has CO₂ and H₂O with mass fraction of 0.4 and 0.6 and rate 10 kg/hr, and stream 2 has CO₂ and H₂O with mass fraction 0.1 and 0.9 and rate 40 Kg/hr, what the mass fraction of CO₂ in the product stream?

An unsteady state system, the flow in rate of A is 5 mole/s, what is the flow out rate of B if the accumulation was 10 mole in 5 seconds?

10 moles of A were present in a system initially, and 10 moles of C are added to it, it follows the reaction 2A + C -> 5B, what are number of moles of B produced?

A reaction has reactants 2 moles of NaOH and 1 mole of H₂SO₄, and products Na₂SO₄ and H₂O, what are the total moles of products?

In a random reaction 2 mole of CH₄ and 1 mole of C₂H₄ are reacted, and 1 mole of C₃H₈ and 1 mole of CxHy are produced, what is x*y?

An unsteady state system, the flow in rate of A is 8 mole/s, what is the flow out rate of B if the accumulation was 6 mole in 2 seconds?

Solution-1 containing 10% nitric acid flowing at the rate 10 Kg/min combines with Solution-2 containing 40% nitric acid flowing at the rate 5 Kg/min, if their product contains 30% nitric acid, what is the flow rate of product?

10 moles of A were present in a system initially, and 10 moles are added to it, it follows the reaction 4A -> B, what are number of moles of B produced?

How is the boundary wall of a closed system?

The flow in rate of A is 8 mole/s, it undergoes a reaction 3A -> B, what are the moles of B that comes out after 6 seconds?

8 moles of A were present in a system initially, and 24 moles of B are added to it, it undergoes the reaction 2A + 3B -> 4C + 5D, what are number of moles of D produced?

A reactor is supplied with 20 moles of C, and it undergoes following reactions C + 0.5O₂ -> CO and C + O₂ -> CO₂, if 10 moles of CO₂ was produced and 5 moles of C remains unreacted, what are the number of moles of CO produced?

The rate of flow in stream with 20% CH₄ and 80% H₂O is 5 mole/hr, the contained was initially filled with 3 mole of H₂O, what will be the percentage of CH₄ in product stream?

A reactor is supplied with 25 moles of C, and it undergoes following reactions C + 0.5O₂ -> CO and C + O₂ -> CO₂, if 13 moles of CO₂ was produced and 5 moles of C remains unreacted, what are the number of moles of CO produced?

An unsteady state system, the flow in rate of A is 6 mole/s, what is the flow out rate of B if the accumulation was 18 mole in 9 seconds?

Ethane is supplied with chlorine in a reactor, how many independent element balances can you write?

Water flowing with chlorine concentration 10 mg/L at the rate of 20 Liter/min, is discharged into a river, if the concentration of chlorine in river is 5 mg/L what is the flow rate of river?

A gas mixture input is given to a membrane with 20% O₂ and 80% N₂, the waste contains 60% of the input and the product contains 30% O₂ and 70% N₂, what are the number of moles of O₂ in the waste?

Ethane is supplied at the rate F with oxygen at the rate W and leaves the following products CO₂, H₂O, O₂, C₂H₆ and H₂ at the rate P. How many independent element balances are possible?

In a batch process, 5 mole of H₂ and 3 mole of CO₂ entered a vessel with some CO₂, if 10 mole of product leaves the vessel, what is the percentage of H₂ in the product?

What is the percentage of excess air if 50 grams of air is in excess and 150 grams of air enters the process?

Solution-1 containing 30% sulfuric acid flowing at the rate 10 Kg/min combines with Solution-2 containing 20% sulfuric acid flowing at the rate 5 Kg/min, if their product is out at the rate 20 Kg/min what is the percentage of sulfuric acid in the product?

Answer the following questions for the given diagram.What is the value of B?

A reaction is A + 2B -> 3C, if 2 moles of A and 4 moles of B entered the system, what are the number of moles of C formed?

octane is burnt with 40% excess O₂, what is the percentage of CO₂ in products?

10 moles of A were present in a system initially, and 8 moles of C are added to it, it undergoes the reaction 5A + 3C -> 4B, what are number of moles of B produced?

How many independent equations are possible, if two components are involved in each of streams?

A liquid solid mixture with 10% solid and 90% liquid is input to a dryer, some of the liquid evaporated and the product contains 60% solid and 40% liquid, what is the ratio of amount of water evaporated and amount of input?

Ethene is burnt with 50% of excess air, what is the percentage of CO₂ in the products?

Methane is at the rate 50 moles is supplied to a reactor with air at the rate 1000 moles, the reactor leaves O₂, N₂, CO₂ and H₂O, what is the percentage of H₂O in products?

Answer the following question for the diagram.What is the value of F?

An egg is an example of which of the following?

A semi-batch process is that in which material enters the system and _____ which of the following should fill the gap?

An unsteady state system, the flow in rate of A is 12 mole/s, what is the flow out rate of B if the accumulation was 18 mole in 3 seconds?

Solution-1 containing 40% nitric acid and 20% carbon dioxide at the rate F combines with Solution-2 containing 30% nitric acid and 40% carbon dioxide at the rate D, the product formed contains 30% nitric acid and 20% carbon dioxide at the rate P, If P = xF what is x?

A reactor is supplied with 6 moles of CO and 3 moles of O₂ and produced 4 moles of CO₂, what is the extent of reaction?

The general material balance equation for reactive system is Accumulation = Input + Generation – x, what is x?

In what ratio 57 octane and 63 octane should be mixed to obtain 59 octane?

What is the final amount of fluid in the vessel if the system is in steady state?

An unsteady-state system, with 10 liters as initial amount of water in the vessel, water flow in rate is 8 liters/ s and flow out rate is 5 liters/s, what will be the amount of water in the vessel after 10 seconds?

A reactor is supplied with a feed of composition 46% C₃H₇O₄, 44% O₂ and 10% N₂, if 50% of the limiting reagent is converted into product, what is the percentage of N₂ in the product?