Ans. Clausius statement
Clausius inequality (dQ/T) 0 .
The equal sign in clausius inequality applies to ideal or carnot cycle. Since integral represents the net change in entropy in one complete cycle and makes it clear entropy does not decrease even in an ideal engine cycle.
thermo1 Select the specific statement of the 2nd Law that applies: A process with a negative...
How many of the following statements is/are correct? *If a process violates the Kelvin-Planck Statement of the Second Law of Thermodynamics, it may or may not violate the Clausius Statement, and vice versa. *If a process violates the Clausius Statement of the Second Law of Thermodynamics, it may or may not violate the Kelvin-Planck Statement, and vice versa. *If a process violates the Kelvin-Planck Statement of the Second Law of Thermodynamics, it must also violate the Clausius Statement, and vice...
Problem 1. 1 kg of air (assumed ideal gas) contained in a piston-cylinder assembly. The a process going from state 1 (T = 500 K, P = 1 MPa) to state 2 (T) = 500 K, P = 0.5 MPa). (a) Determine the change of internal energy during the process. (b) Determine the work involved in this process. (c) Describe Kelvin-Planck statement of the 2nd law of thermodynamics first, and then justify whether this process violates the Kelvin-Planck statement. (d)...
Which statement can be attributed to the 2nd Law of Thermodynamics? a For any real process, energy is conserved. b For any real process, entropy is conserved. c Energy flow has a direction. d Energy has a magnitude. Entropy change across a pump used in a certain practical application was found out to have a negative value. Which of the below statement is true? a The entropy generation across the pump is negative. b There is heat loss from the...
True or False (Problems 1 through 10) 1. The change in entropy of a closed system is the same for every process between two specified states 2. The entropy of a fixed amount of an incompressible substance increases in every process for which temperature increases 3. A process that violates the second law of thermodynamics violates the first law of thermodynamics. 4. When a net amount of work is done on a closed system undergoing an internally reversible process, a...
Explain the answer Which statement can be attributed to the 2nd Law of Thermodynamics? For any real process, energy is conserved. For any real process, entropy is conserved. Energy flow has a direction. Energy has a magnitude.
is Spring 19 5.1 For a device operating on a cycle has to comply with either the Kelvin-Planck Statement or the Clausius Statement of the Second Law of Thermodynamics (a) True(b) False (a) It gained 1000 KJ by heat (b) It gained 1000KJ by net work input only (c) It gained 5.2 The internal energy of a closed system increases by 1000 KJ. This is due to: 1000KJ by a combination of heat and work input (d) Depending on the...
Choose the correct statement(s) regarding the entropy generation (Sgen) (multiple answers possible) O A. The value of entropy generation is zero during an internally reversible process OB. A process featured with negative entropy generation is impossible OC. Entropy generation is a property of a system D. Entropy generation is always a positive quantity or zero
Which is the least true statement for the Ideal Gas Law A. particles can be diatomic B. The system is in equilibrium C. It works best at lower temperatures D. The temperature must be in Kelvin or Celsius
In a certain thermodynamic process, both the temperature and volume of an ideal gas decrease. Select a correct statement. The described process may be an isobaric compression of an ideal gas The described situation happens during adiabatic compression of an ideal gas because Cp > CV This situation is not possible for an ideal gas, but may be possible for a substance that undergoes a phase transition This situation is impossible: during compression, work of external forces on the gas...
Consider a piston cylinder process in air (as an ideal gas with constant specific heats) which goes from state 1 at 1 atm, 300 K to state 2 at: 3 atm and 400K. (use k=1.4, Cp = 1.005 kJ/(kg K), Cv=0.718 kJ/(kg K), R= 0.287 kJ/(kg K)) (these are the same conditions as question 4). What must the heat transfer be (in kJ/kg), if the process takes place without entropy generation and it can be assumed the temperature at system...