The free expansion process is a constant enthalpy process.  A. Correct  B. Incorrect

The free expansion process is a constant enthalpy process.  A. Correct  B. Incorrect
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Last Answer : Answer : c

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Last Answer : Answer : a

Which of the following parameters is constant for a mole for most of the gases at a given temperature and pressure  (a) enthalpy  (b) volume  (c) mass  (d) entropy  (e) specific volume.

Description : Which of the following parameters is constant for a mole for most of the gases at a given temperature and pressure  (a) enthalpy  (b) volume  (c) mass  (d) entropy  (e) specific volume.

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Last Answer : Answer: A

Which of the following relations is not applicable in a free expansion process?  a. Heat is rejected to zero  b. Work done is zero  c. Change in temperature is zero  d. Heat supplied is zero

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The free expansion process is __________ non-flow process.  A. reversible  B. irreversible

Description : The free expansion process is __________ non-flow process.  A. reversible  B. irreversible

Last Answer : Answer: B

Workdone in a free expansion process is  A.zero  B.minimum  C.maximum  D.positive

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In order that a cycle be reversible, following must be satisfied  (a) free expansion or friction resisted expansion/compression process should not be encountered  (b) when heat is being absorbed, temperature of hot source and working sub¬stance should be same  (c) when beat is being rejected, temperature of cold source and working sub-stance should be same  (d) all of the above  (e) none of the above.

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If a fluid expands suddenly into vacuum through an orifice of large dimension, then such a process is called  (a) free expansion  (b) hyperbolic expansion  (c) adiabatic expansion  (d) parabolic expansion  (e) throttling.

Description : If a fluid expands suddenly into vacuum through an orifice of large dimension, then such a process is called  (a) free expansion  (b) hyperbolic expansion  (c) adiabatic expansion  (d) parabolic expansion  (e) throttling.

Last Answer : Answer : a

If a gas vapour is allowed to expand through a very minute aperture, then such a process is known as  (a) free expansion  (b) hyperbolic expansion  (c) adiabatic expansion  (d) parabolic expansion  (e) throttling.

Description : If a gas vapour is allowed to expand through a very minute aperture, then such a process is known as  (a) free expansion  (b) hyperbolic expansion  (c) adiabatic expansion  (d) parabolic expansion  (e) throttling.

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In a free expansion process  (a) work done is zero  (b) heat transfer is zero  (c) both (a) and (b) above  (d) work done is zero but heat increases  (e) work done is zero but heat decreases.

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Last Answer : Answer : c

The value of n = 1 in the polytropic process indicates it to be  (a) reversible process  (b) isothermal process  (c) adiabatic process  (d) irreversible process  (e) free expansion process.

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Work done in a free expansion process is  (a) + ve  (b) -ve  (c) zero  (d) maximum  (e) minimum.

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Last Answer : Answer : c

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Which of the following values characterize the state of the system?  a. cycle  b. process  c. property  d. enthalpy

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The change that the system that undergoes from one equilibrium state to another is known as  a. oath  b. process  c. enthalpy change  d. entropy change

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A state occurs in isentropic process  a. The change in entropy is 0  b. The change in entropy is 1  c. The change in enthalpy is 0  d. The change in enthalpy is 1

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Regardless of the process, the change in enthalpy firm moles of ideal gas is  a. Heat  b. Enthalpy  c. Entropy  d. Density

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Steam is throttled to 0.1 MPa with 20 degrees of superheat. (a) What is the quality of throttled steam if its pressure is 0.75 MPa (b) What is the enthalpy of the process?  a) 97.6%,2713 kJ/kg  b) -97.6%, 2713 kJ/kg  c) 87.6%,3713 kJ/kg  d) -87.6%, 3713 kJ/kg

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Last Answer : 97.6%,2713 kJ/kg

An adiabatic process in which there is no change in system enthalpy but for which there is a significant decrease in pressure is called _____.  A. Isochoric process  B. Isobaric process  C. Throttling process  D. Quasistatic process

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Last Answer : Throttling process

In an isothermal process,  A. there is no change in temperature  B. there is no change in enthalpy  C. there is no change in internal energy  D. all of these

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Last Answer : Answer: D

There is no change in internal energy in an isothermal process.  A. Correct  B. Incorrect

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Last Answer : Answer: A

When the expansion of compression of gas takes place without transfer of heat to or from the gas the process is called  a. reversible  b. adiabatic  c. polytropic  d. isothermal

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Last Answer : adiabatic

When the expansion of compression of gas takes place without transfer of heat or from the gas the process is called;  a. Isometric process  b. Isothermal process  c. Isobaric process  d. Adiabatic process

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An ideal gas is compresses isothermally. The enthalpy change is  a. Always negative  b. Always positive  c. zero  d. undefined

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Last Answer : zero

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Last Answer : the enthalpy of reactants is lower than the enthalpy of products.

What is the measure of the energy that is no longer available to perform useful work within the current environment?  a. enthalpy  b. entropy  c. internal energy  d. latent heat

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What is known as the total heat and heat content at various times in the history?  a. enthalpy  b. entropy  c. internal energy  d. latent heat

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Last Answer : Enthalpy

A system having a rigid boundary that energy, work and mass does not cross its boundaries  a. Specific Heat  b. Specific Gravity  c. Isolated System  d. Enthalpy

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The 1st Law of Thermodynamics on what principle?  a. Conservation of Energy  b. Conservation of mass  c. Enthalpy  d. Isometric

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Steam at 1000 lbf/ft^2 pressure and 300˚R has specific volume of 6.5 ft^3/lbm and a specific enthalpy of 9800 lbf-ft/lbm. Find the internal energy per pound mass of steam.  A.2500 lbf-ft/lbm  B.3300 lbf-ft/lbm  C.5400 lbf-ft/lbm  D.6900 lbf-ft/lbm Formula: h= u+ pV u= h– pV

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Last Answer : 3300 lbf-ft/lbm

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Last Answer : Law of Dulong and Petit