tough Chemical Process Calculation Questions focuses on “Energy Balance terminology – IV”.
1. A ___________ is any variable whose value depends on how the process takes place.
a) Path variable
b) State variable
c) Neither Path nor State variable
d) None of the mentioned
Answer: a
Clarification: A Path variable is any variable whose value depends on how the process takes place.
2. Which one is not a path variable?
a) Work
b) Heat
c) Internal Energy
d) None of the mentioned
Answer: c
Clarification: Internal energy does not depend on the path.
3. Any variable whose value depends only on the state of the system is called
a) Path variable
b) State variable
c) Neither Path nor State variable
d) None of the mentioned
Answer: b
Clarification: A State variable is any variable whose value depends only on the state, not on the previous history.
4. Which one is a state variable ?
a) Internal Energy
b) Enthalpy
c) Entropy
d) All of the mentioned
Answer: d
Clarification: All a, b, c are state variables as these are only depended only on the state, not on the history.
5. For an adiabatic system, two statements are given as following
I: The system is insulated
II: The process takes place so fast that there is no time for heat to be transferred.
a) Only I is correct
b) Only II is correct
c) Both I & II are correct
d) Neither I nor II correct
Answer: c
Clarification: Both I and II are the properties of an Adiabatic system.
6. Which one is an intensive variable?
a) Pressure
b) Temperature
c) Volume
d) All of the mentioned
Answer: d
Clarification: All three Pressure, Temperature and Volume are intensive variables as these are not depended on the path .
7. Heat transfer is caused by
a) Pressure difference
b) Temperature difference
c) Volume difference
d) None of the mentioned
Answer: b
Clarification: Heat transfer is caused by Temperature difference.
8. Heat is ___________ when transferred to a system.
a) Positive
b) Negative
c) Zero
d) None of the mentioned
Answer: a
Clarification: Heat is Positive when transferred to a system.
9. Heat is negative when transferred to the _____________
a) System
b) Surrounding
c) Boundary
d) None of the mentioned
Answer: a
Clarification: Heat is negative when transferred to the surrounding .
10. A process in which no heat transfer takes place (Q=0) is
a) Isobaric process
b) Adiabatic process
c) Isothermal process
d) None of the mentioned
Answer: b
Clarification: A process in which no heat transfer takes place (Q=0) is an Adiabatic process.
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