# Chemical Process Calculation Questions and Answers – Energy Balances without Reaction

This set of Chemical Process Calculation Multiple Choice Questions & Answers (MCQs) focuses on “Energy Balances without Reaction”.

1. The energy of a system plus surrounding can neither be created nor destroyed, Is the law of
a) Conservation of Mass
b) Conservation of Energy
c) Conservation of Momentum
d) None of the mentioned

Explanation: The Conservation of Energy states that the energy of a system plus surrounding can neither be created nor destroyed.

2. For an unsteady state closed system , energy balance is
a) U+25B3E = U+25B3(U + PE + KE)
b) U+25B3E = U+25B3(U + PE – KE)
c) U+25B3E = U+25B3(U – PE -KE)
d) None of the mentioned

Explanation: U+25B3E = U+25B3(U + PE + KE).

3. A general energy balance
a) U+25B3E = W + Q
b) U+25B3E = W – Q
c) U+25B3E = -W + Q
d) None of the mentioned

Explanation: U+25B3E = W + Q.

4. For a steady state closed system
a) U+25B3E > 0
b) U+25B3E < 0
c) U+25B3E = 0
d) None of the mentioned

Explanation: For a steady state closed system, U+25B3E = 0.

5. For a steady state closed system
a) U+25B3U > 0
b) U+25B3U < 0
c) U+25B3U = 0
d) None of the mentioned

Explanation: For a steady state closed system, U+25B3U = 0.
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6. For a steady state closed system
a) Q + W > 0
b) Q + W < 0
c) Q + W = 0
d) None of the mentioned

Explanation: For a steady state closed system, U+25B3E = 0.

7. For an open system, energy balance is
a) U+25B3E = Q + W – U+25B3(H + KE + PE)
b) U+25B3E = Q + W + U+25B3(H + KE + PE)
c) U+25B3E = Q + W – U+25B3(H – KE + PE)
d) None of the mentioned

Explanation: For an open system, U+25B3E = Q + W – U+25B3(H + KE + PE).

8. Evaporator that concentrates a solute is an example of
d) None of the mentioned

Explanation: Evaporator that concentrates a solute is Open, steady state process.

9. Turbine is an example of
d) None of the mentioned

Explanation: Turbine is Open, steady state process.

10. Batch Distillation is an example of
d) None of the mentioned

Explanation: Batch Distillation is Open, unsteady state process.

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