This set of Advanced Chemical Engineering Questions & Answers focuses on “Energy Balances Application in Processes”.
1. What is the sensible heat of a reaction if the enthalpy of outputs is 15 J, and enthalpy of inputs is 5 J?
a) 3 J
b) 5 J
c) 10 J
d) 15 J
View answer
Explanation: Q = ∆Houtput – ∆Hinput = 15 – 5 = 10 J.
2. What is the sensible heat of a reaction if the enthalpy of outputs is 5 J, and enthalpy of inputs is 10 J?
a) -5 J
b) 5 J
c) -10 J
d) 10 J
View answer
Explanation: Q = ∆Houtput – ∆Hinput = 5 – 10 = -5J.
3. What is the heat of reaction if enthalpy of inputs and outputs at 25oC are 10 J and 20 J, the enthalpy of input and outputs at given temperature are 25 J and 30 J, enthalpy change of the reaction is 50 J?
a) 45 J
b) 50 J
c) 55 J
d) 60 J
View answer
Explanation: Heat of reaction = (25 – 10) – (30 – 20) + 50 = 55 J.
4. What is the heat of reaction if enthalpy of inputs and outputs at 25oC are 5 J and 8 J, the enthalpy of input and outputs at given temperature are 12 J and 15 J, enthalpy change of the reaction is 25 J?
a) 20 J
b) 25 J
c) 30 J
d) 35 J
View answer
Explanation: Heat of reaction = (12 – 5) – (15 – 8) + 25 = 25 J.
5. What is the heat of reaction if enthalpy of inputs and outputs at 25oC are 10 J and 8 J, the enthalpy of input and outputs at given temperature are 5 J and 20 J, enthalpy change of the reaction is 30 J?
a) 13 J
b) 22 J
c) 28 J
d) 35 J
View answer
Explanation: Heat of reaction = (5 – 10) – (20 – 8) + 30 = 13 J.
6. Theoretical flame temperature is defined for which process?
a) Isothermal
b) Adiabatic
c) Isobaric
d) Isochoric
View answer
Explanation: Theoretical flame temperature is defined for adiabatic processes.
7. What is the heat for the process for which theoretical flame temperature is defined?
a) Positive
b) Negative
c) Zero
d) Cannot say
View answer
Explanation: Theoretical flame temperature is defined for adiabatic processes, => Q = 0.
8. How much the limiting reactant reacts in the process for which theoretical flame temperature is defined?
a) Completely
b) Partially
c) Does not react
d) None of the mentioned
View answer
Explanation: The limiting reactant reacts completely in the process for which theoretical flame temperature is defined.
9. What are other effects occur in the process for which theoretical flame temperature is defined?
a) Electrical effects
b) Free radical formation
c) Ionization
d) No other effects
View answer
Explanation: No other effect occurs in the process for which theoretical flame temperature is defined.
10. If the temperature of the reaction is 25oC what will be the temperature of the products of the reaction for which theoretical flame temperature is defined?
a) 25oC
b) 45oC
c) 75oC
d) 100oC
View answer
Explanation: For the reaction in which theoretical flame temperature is defined temperature of the products is same as the temperature of the reaction.
11. If the temperature of the reaction is 50oC what will be the temperature of the products of the reaction for which theoretical flame temperature is defined?
a) 25oC
b) 50oC
c) 75oC
d) 100oC
View answer
Explanation: For the reaction in which theoretical flame temperature is defined temperature of the products is same as the temperature of the reaction.
12. What is the heat transferred for a 10 mole unsteady state closed system, if a change in internal energy is 5 J/mole?
a) 5 J
b) 10 J
c) 50 J
d) 100 J
View answer
Explanation: Q = ∆U = 10*5 = 50 J.
13. What is the heat transferred for a 10 mole unsteady state closed system, if initial internal energy is 6 J/mole and final internal energy is 10 J/mole?
a) 4 J
b) 10 J
c) 40 J
d) 60 J
View answer
Explanation: Q = Uf – Ui = 10(10 – 6) = 40 J.
14. What is the heat transferred for an unsteady state closed system, if a change in enthalpy is 5 J, and change in pressure is 10 Pa at constant volume 5 m3?
a) 5 J
b) 50 J
c) 55 J
d) 85 J
View answer
Explanation: Q = 5 + 10*5 = 55 J.
15. What is the heat transferred for an unsteady state closed system, if change in enthalpy is 15 J, and change in volume is 2 m3 at constant pressure 5 Pa?
a) 10 J
b) 15 J
c) 20 J
d) 25 J
View answer
Explanation: Q = 15 + 2*5 = 25 J.
Sanfoundry Global Education & Learning Series – Basic Chemical Engineering.
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