Here are the answers to the questions posted yesterday on the topic THERMODYNAMICS. Please feel free to comment or ask for clarifications.

1. The state of a simple substance can be defined by at least how many properties (e.g. pressure, mass, temperature, density)?

ANSWER: B. TWO

2. The ability of a heat engine to convert the supplied heat to work is referred to as…

ANSWER: A. THERMAL EFFICIENCY

3. To increase the efficiency of a Carnot cycle…

ANSWER: C. BOTH a AND b

Increasing the max temperature and decreasing the min temperature will increase the area in the T-s diagram meaning more work for the same heat input.

4. The area under the curve of the process plotted in the p-V diagram corresponds to…

ANSWER: B. WORK NON-FLOW (INTEGRAL OF pdV)

5. The value of n, in the equation PVn=C when the process is isothermal?

ANSWER: A. 1

6. The value of n, in the equation PVn=C when the process is isometric?

ANSWER: C. INFINITY

7. In the T-s diagram, the area under the process curve corresponds to…

ANSWER: A. HEAT OF THE PROCESS (Q)

8. What law of thermodynamics introduced the concept of entropy?

ANSWER: B. SECOND LAW

The second law of thermodynamics explains irreversibility of the process and introduced the concept of entropy.

9. A device that converts heat energy to shaft work.

ANSWER: B. HEAT ENGINE

10. A thermodynamic process characterized by a straight vertical line in the T-s diagram.

ANSWER: B. ADIABATIC PROCESS

The horizontal axis of the T-s diagram is entropy, so straight vertical line is a constant entropy process (adiabatic or reversible isentropic).

1. The state of a simple substance can be defined by at least how many properties (e.g. pressure, mass, temperature, density)?

ANSWER: B. TWO

2. The ability of a heat engine to convert the supplied heat to work is referred to as…

ANSWER: A. THERMAL EFFICIENCY

3. To increase the efficiency of a Carnot cycle…

ANSWER: C. BOTH a AND b

Increasing the max temperature and decreasing the min temperature will increase the area in the T-s diagram meaning more work for the same heat input.

4. The area under the curve of the process plotted in the p-V diagram corresponds to…

ANSWER: B. WORK NON-FLOW (INTEGRAL OF pdV)

5. The value of n, in the equation PVn=C when the process is isothermal?

ANSWER: A. 1

6. The value of n, in the equation PVn=C when the process is isometric?

ANSWER: C. INFINITY

7. In the T-s diagram, the area under the process curve corresponds to…

ANSWER: A. HEAT OF THE PROCESS (Q)

8. What law of thermodynamics introduced the concept of entropy?

ANSWER: B. SECOND LAW

The second law of thermodynamics explains irreversibility of the process and introduced the concept of entropy.

9. A device that converts heat energy to shaft work.

ANSWER: B. HEAT ENGINE

10. A thermodynamic process characterized by a straight vertical line in the T-s diagram.

ANSWER: B. ADIABATIC PROCESS

The horizontal axis of the T-s diagram is entropy, so straight vertical line is a constant entropy process (adiabatic or reversible isentropic).

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