# Chemical Process Calculation Questions and Answers – Energy balance for Different type of systems – II

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This set of Chemical Process Calculation Multiple Choice Questions & Answers (MCQs) focuses on “Energy balance for Different type of systems – II”.

1. Change in the internal energy for a steady-state system is always ___________
a) Positive
b) Negative
c) Zero
d) None of the mentioned

Explanation: Change in the internal energy for a steady-state system is always zero.

2. For a steady state system, 10 J of heat is supplied to the system, what is the work done by the system?
a) 10 J
b) 20 J
c) 30 J
d) 40 J

Explanation: Change in the internal energy for a steady-state system is always zero so Q = W.

3. If x J of work is done on a steady system, what is the heat for the system?
a) + x J
b) –x J
c) 0 J
d) None of the mentioned

Explanation: Change in the internal energy for a steady-state system is always zero so Q + W= 0.

4. 10 J of heat is removed from a steady state system, what is the work done on the system?
a) – 10 J
b) 10 J
c) – 5 J
d) 5 J

Explanation: 0 = – 10 + W.

5. 25 J of work is done by a steady state system, what is the heat supplied to the system?
a) – 25 J
b) 25 J
c) 20 J
d) – 20 J

Explanation: 0 = – 15 + Q.

6. 20 J of heat is supplied to a system and a work of 30 J performed on it. If 50 J of heat is removed from the system, which type of system is it?
c) Closed
d) None of the mentioned

Explanation: ∆E = 0.

7. 10 J of heat is supplied to a system and a work of 30 J performed on it. If 50 J of heat is removed from the system, which type of system is it?
c) Closed
d) None of the mentioned

Explanation: ∆E is not equal to zero.

8. If 25 J is work is done on a system and same amount of heat is also supplied. What kind of system is it?
c) Closed
d) None of the mentioned

Explanation: ∆E is not equal to zero.

9. If 25 J is work is done by a system and same amount of heat is also supplied to the system. What kind of system is it?
c) Closed
d) None of the mentioned

Explanation: ∆E is equal to zero.

10. There must be no accumulation of mass or energy over the time period of interest in a _________
c) Closed
d) None of the mentioned 