Entropy change for an adiabatic reversible process is

Entropy change for an adiabatic reversible process is
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Entropy change for an adiabatic reversible process is A. Positive B. Zero C. Negative D. Constant
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Why entropy change for a reversible adiabatic process is zero ?

Description : Why entropy change for a reversible adiabatic process is zero ?

Last Answer : Because there is no heat transfer in this process.

Entropy change in case of reversible adiabatic process is (A) Minimum (B) Zero (C) Maximum (D) Indeterminate

Description : Entropy change in case of reversible adiabatic process is (A) Minimum (B) Zero (C) Maximum (D) Indeterminate

Last Answer : (B) Zero

Pick out the wrong statement: (A) The expansion of a gas in vacuum is an irreversible process (B) An isometric process is a constant pressure process (C) Entropy change for a reversible adiabatic process is zero (D) Free energy change for a spontaneous process is negative

Description : Pick out the wrong statement: (A) The expansion of a gas in vacuum is an irreversible process (B) An isometric process is a constant pressure process (C) Entropy change for a reversible adiabatic process is zero (D) Free energy change for a spontaneous process is negative

Last Answer : (B) An isometric process is a constant pressure process

Pick out the wrong statement. (A) The net change in entropy in any reversible cycle is always zero (B) The entropy of the system as a whole in an irreversible process increases (C) The entropy of the universe tends to a maximum (D) The entropy of a substance does not remain constant during a reversible adiabatic change

Description : Pick out the wrong statement. (A) The net change in entropy in any reversible cycle is always zero (B) The entropy of the system as a whole in an irreversible process increases (C) The ... to a maximum (D) The entropy of a substance does not remain constant during a reversible adiabatic change

Last Answer : (D) The entropy of a substance does not remain constant during a reversible adiabatic change

During adiabatic, internally reversible process, what is true about the change in entropy?  A. It is temperature-dependent  B. It is always greater than zero  C. It is always zero  D. It is always less than zero

Description : During adiabatic, internally reversible process, what is true about the change in entropy?  A. It is temperature-dependent  B. It is always greater than zero  C. It is always zero  D. It is always less than zero

Last Answer : It is always zero

For reversible adiabatic process, change in entropy is  (a) maximum  (b) minimum  (c) zero  (d) unpredictable  (e) negative

Description : For reversible adiabatic process, change in entropy is  (a) maximum  (b) minimum  (c) zero  (d) unpredictable  (e) negative

Last Answer : Answer : c

Entropy of a substance remains constant during a/an __________ change. (A) Reversible isothermal (B) Irreversible isothermal (C) Reversible adiabatic (D) None of these

Description : Entropy of a substance remains constant during a/an __________ change. (A) Reversible isothermal (B) Irreversible isothermal (C) Reversible adiabatic (D) None of these

Last Answer : (C) Reversible adiabatic

During the adiabatic process, which of the following is the change in entropy?  a. zero  b. greater than zero  c. less than zero  d. infinity

Description : During the adiabatic process, which of the following is the change in entropy?  a. zero  b. greater than zero  c. less than zero  d. infinity

Last Answer : zero

. The entropy change in a reversible isothermal process, when an ideal gas expands to four times its initial volume is (A) R loge 4 (B) R log10 4 (C) Cv log10 4 (D) Cv loge 4

Description : . The entropy change in a reversible isothermal process, when an ideal gas expands to four times its initial volume is (A) R loge 4 (B) R log10 4 (C) Cv log10 4 (D) Cv loge 4

Last Answer : (A) R loge 4

. The entropy change in a reversible isothermal process, when an ideal gas expands to four times its initial volume is (A) R loge 4 (B) R log10 4 (C) Cv log10 4 (D) Cv loge 4

Description : . The entropy change in a reversible isothermal process, when an ideal gas expands to four times its initial volume is (A) R loge 4 (B) R log10 4 (C) Cv log10 4 (D) Cv loge 4

Last Answer : (A) R loge 4

A system undergoes a change from a given initial state to a given final state either by an irreversible process or by a reversible process, then (where, Δ S1 and Δ SR are the entropy changes of the system for the irreversible and reversible processes respectively) (A) Δ S1is always < Δ SR (B) Δ S1is sometimes > Δ SR (C) Δ S1is always > Δ SR (D) Δ S1is always = Δ SR

Description : A system undergoes a change from a given initial state to a given final state either by an irreversible process or by a reversible process, then (where, Δ S1 and Δ SR are the entropy changes of the system for the ... S1is sometimes > Δ SR (C) Δ S1is always > Δ SR (D) Δ S1is always = Δ SR

Last Answer : (C) Δ S1is always > Δ SR

Which of the following occurs in a reversible polytrophic process?  a. Enthalpy remains constant  b. Internal energy does not change  c. Some heat transfer occurs  d. Entropy remains constant

Description : Which of the following occurs in a reversible polytrophic process?  a. Enthalpy remains constant  b. Internal energy does not change  c. Some heat transfer occurs  d. Entropy remains constant

Last Answer : Some heat transfer occurs

Change in internal energy in a closed system is equal to heat transferred if the reversible process takes place at constant  (a) pressure  (b) temperature  (c) volume  (d) internal energy  (e) entropy.

Description : Change in internal energy in a closed system is equal to heat transferred if the reversible process takes place at constant  (a) pressure  (b) temperature  (c) volume  (d) internal energy  (e) entropy.

Last Answer : Answer : c

Change in enthalpy in a closed system is equal to heat transferred if the reversible process takes place at constant  (a) pressure  (b) temperature  (c) volume  (d) internal energy  (e) entropy.

Description : Change in enthalpy in a closed system is equal to heat transferred if the reversible process takes place at constant  (a) pressure  (b) temperature  (c) volume  (d) internal energy  (e) entropy.

Last Answer : Answer : a

Which of the following is not correct for a reversible adiabatic process? (A) TV γ-1 = constant (B) p 1-γ .T Y = constant (C) PV γ = constant (D) None of these

Description : Which of the following is not correct for a reversible adiabatic process? (A) TV γ-1 = constant (B) p 1-γ .T Y = constant (C) PV γ = constant (D) None of these

Last Answer : (D) None of these

When a gas in a vessel expands, its internal energy decreases. The process involved is (A) Reversible (B) Irreversible (C) Isothermal (D) Adiabatic

Description : When a gas in a vessel expands, its internal energy decreases. The process involved is (A) Reversible (B) Irreversible (C) Isothermal (D) Adiabatic

Last Answer : (A) Reversible

In polytropic process (PV n = constant), if n = 1; it means a/an __________ process. (A) Adiabatic (B) Reversible (C) Isothermal (D) None of these

Description : In polytropic process (PV n = constant), if n = 1; it means a/an __________ process. (A) Adiabatic (B) Reversible (C) Isothermal (D) None of these

Last Answer : (C) Isothermal

Specific heat of a gas for a reversible adiabatic process is (A) Negative (B) Zero (C) Infinity (D) None of these

Description : Specific heat of a gas for a reversible adiabatic process is (A) Negative (B) Zero (C) Infinity (D) None of these

Last Answer : (B) Zero

What happens in a reversible adiabatic expansion process? (A) Heating takes place (B) Cooling takes place (C) Pressure is constant (D) Temperature is constant

Description : What happens in a reversible adiabatic expansion process? (A) Heating takes place (B) Cooling takes place (C) Pressure is constant (D) Temperature is constant

Last Answer : (B) Cooling takes place

PVy = constant, holds good for an isentropic process, which is (A) Reversible and isothermal (B) Isothermal and irreversible (C) Reversible and adiabatic (D) Adiabatic and irreversible

Description : PVy = constant, holds good for an isentropic process, which is (A) Reversible and isothermal (B) Isothermal and irreversible (C) Reversible and adiabatic (D) Adiabatic and irreversible

Last Answer : C) Reversible and adiabatic

In the equation, PVn = constant, if the value of n = ± ∞, then it represents a reversible __________ process. (A) Adiabatic (B) Isometric (C) Isentropic (D) Isothermal

Description : In the equation, PVn = constant, if the value of n = ± ∞, then it represents a reversible __________ process. (A) Adiabatic (B) Isometric (C) Isentropic (D) Isothermal

Last Answer : (B) Isometric

The expression for the work done for a reversible polytropic process can be used to obtain the expression for work done for all processes, except reversible __________ process. (A) Isobaric (B) Isothermal (C) Adiabatic (D) None of these

Description : The expression for the work done for a reversible polytropic process can be used to obtain the expression for work done for all processes, except reversible __________ process. (A) Isobaric (B) Isothermal (C) Adiabatic (D) None of these

Last Answer : (B) Isothermal

In the equation PVn = constant, if the value of n = y = Cp/Cv, then it represents a reversible __________ process. (A) Isothermal (B) Adiabatic (C) Isentropic (D) Polytropic

Description : In the equation PVn = constant, if the value of n = y = Cp/Cv, then it represents a reversible __________ process. (A) Isothermal (B) Adiabatic (C) Isentropic (D) Polytropic

Last Answer : (C) Isentropic

In the equation, PVn = constant, if the value of n = 1, then it represents a reversible __________ process. (A) Isothermal (B) Isobaric (C) Polytropic (D) Adiabatic

Description : In the equation, PVn = constant, if the value of n = 1, then it represents a reversible __________ process. (A) Isothermal (B) Isobaric (C) Polytropic (D) Adiabatic

Last Answer : (A) Isothermal

Air enters an adiabatic compressor at 300K. The exit temperature for a compression ratio of 3, assuming air to be an ideal gas (Y = Cp/Cv = 7/5) and the process to be reversible, is (A) 300 × (32/7) (B) 300 × (33/5) (C) 300 × (333/7) (D) 300 × (35/7)

Description : Air enters an adiabatic compressor at 300K. The exit temperature for a compression ratio of 3, assuming air to be an ideal gas (Y = Cp/Cv = 7/5) and the process to be reversible, is (A) 300 × (32/7) (B) 300 × (33/5) (C) 300 × (333/7) (D) 300 × (35/7)

Last Answer : A) 300 × (32/7)

Which of the following non-flow reversible compression processes require maximum work? (A) Adiabatic process (B) Isothermal process (C) Isobaric process (D) All require same work

Description : Which of the following non-flow reversible compression processes require maximum work? (A) Adiabatic process (B) Isothermal process (C) Isobaric process (D) All require same work

Last Answer : (A) Adiabatic process

Adiabatic process is (A) Essentially an isentropic process is___________ (B) Non-heat transfer process (C) Reversible process (D) Constant temperature process

Description : Adiabatic process is (A) Essentially an isentropic process is___________ (B) Non-heat transfer process (C) Reversible process (D) Constant temperature process

Last Answer : (B) Non-heat transfer process

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

Description : 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

Last Answer : adiabatic

Another name of reversible adiabatic process  a. Isentropic Process  b. Isometric Process  c. Isobaric Process  d. Isothermal Process

Description : Another name of reversible adiabatic process  a. Isentropic Process  b. Isometric Process  c. Isobaric Process  d. Isothermal Process

Last Answer : Isentropic Process

The term “isentropic process” used in thermodynamics implies what?  A. Reversible adiabatic process  B. Externally reversible, adiabatic process  C. Internally reversible, adiabatic process  D. Irreversible adiabatic process

Description : The term “isentropic process” used in thermodynamics implies what?  A. Reversible adiabatic process  B. Externally reversible, adiabatic process  C. Internally reversible, adiabatic process  D. Irreversible adiabatic process

Last Answer : Internally reversible, adiabatic process

“A reversible adiabatic process is necessarily isentropic but an isentropic process is not necessarily reversible adiabatic process.” This statement is:  A. True  B. False  C. May be true and may be false  D. Absurd

Description : “A reversible adiabatic process is necessarily isentropic but an isentropic process is not necessarily reversible adiabatic process.” This statement is:  A. True  B. False  C. May be true and may be false  D. Absurd

Last Answer : True

How does an adiabatic process compare to an isentropic process?  A. Adiabatic heat transfer is not equal to zero; isentropic heat transfer is zero  B. Both heat transfer = 0; isentropic: reversible  C. Adiabatic heat transfer = 0; isentropic: heat transfer is not equal to zero  D. Both heat transfer is not equal to zero; isentropic: irreversible

Description : How does an adiabatic process compare to an isentropic process?  A. Adiabatic heat transfer is not equal to zero; isentropic heat transfer is zero  B. Both heat transfer = 0; isentropic: reversible  ... is not equal to zero  D. Both heat transfer is not equal to zero; isentropic: irreversible

Last Answer : Both heat transfer = 0; isentropic: reversible

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.

Description : 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.

Last Answer : Answer : b

Assertion :- In an isolated system the entropy increases due to spontanous process. Reason :- The processes in an isolated system are adiabatic.

Description : Assertion :- In an isolated system the entropy increases due to spontanous process. Reason :- The processes in an isolated system are adiabatic.

Last Answer : Assertion :- In an isolated system the entropy increases due to spontanous process. Reason :- The ... D. If both Assertion & Reason are false.

A thermodynamic process in which entropy is conserved  a. isentropic  b. adiabatic  c. isothermal  d. polytropic

Description : A thermodynamic process in which entropy is conserved  a. isentropic  b. adiabatic  c. isothermal  d. polytropic

Last Answer : isentropic

Generation of heat by friction is an example of a/an __________ change. (A) Isothermal (B) Irreversible (C) Adiabatic (D) Reversible

Description : Generation of heat by friction is an example of a/an __________ change. (A) Isothermal (B) Irreversible (C) Adiabatic (D) Reversible

Last Answer : (B) Irreversible

A ______ is a flow in which the gas flow is adiabatic and frictionless and entropy change is zero.  A. Isentropic flow  B. Isobaric flow  C. Steady flow  D. Uniform flow

Description : A ______ is a flow in which the gas flow is adiabatic and frictionless and entropy change is zero.  A. Isentropic flow  B. Isobaric flow  C. Steady flow  D. Uniform flow

Last Answer : Isentropic flow

Throttling process is a/an __________ process. (A) Reversible and isothermal (B) Irreversible and constant enthalpy (C) Reversible and constant entropy (D) Reversible and constant enthalpy

Description : Throttling process is a/an __________ process. (A) Reversible and isothermal (B) Irreversible and constant enthalpy (C) Reversible and constant entropy (D) Reversible and constant enthalpy

Last Answer : (B) Irreversible and constant enthalpy

The expression for entropy change given by, ΔS = - nR ln (P2/P1), holds good for (A) Expansion of a real gas (B) Reversible isothermal volume change (C) Heating of an ideal gas (D) Cooling of a real gas

Description : The expression for entropy change given by, ΔS = - nR ln (P2/P1), holds good for (A) Expansion of a real gas (B) Reversible isothermal volume change (C) Heating of an ideal gas (D) Cooling of a real gas

Last Answer : (B) Reversible isothermal volume change

The expression for entropy change given by, ΔS = nR ln (V2/V1) + nCvln (T2/T1) is valid for (A) Reversible isothermal volume change (B) Heating of a substance (C) Cooling of a substance (D) Simultaneous heating and expansion of an ideal gas

Description : The expression for entropy change given by, ΔS = nR ln (V2/V1) + nCvln (T2/T1) is valid for (A) Reversible isothermal volume change (B) Heating of a substance (C) Cooling of a substance (D) Simultaneous heating and expansion of an ideal gas

Last Answer : (D) Simultaneous heating and expansion of an ideal gas

If heat be exchanged in a reversible manner, which of the following property of the working substance will change accordingly  (a) temperature  (b) enthalpy  (c) internal energy  (d) entropy  (e) all of the above.

Description : If heat be exchanged in a reversible manner, which of the following property of the working substance will change accordingly  (a) temperature  (b) enthalpy  (c) internal energy  (d) entropy  (e) all of the above.

Last Answer : Answer : d

On a P-V diagram of an ideal gas, suppose a reversible adiabatic line intersects a reversible isothermal line at point A. Then at a point A, the slope of the reversible adiabatic line (∂P/∂V)s and the slope of the reversible isothermal line (∂P/∂V)T are related as (where, y = Cp/Cv) (A) (∂P/∂V)S = (∂P/∂V)T (B) (∂P/∂V)S = [(∂P/∂V)T]Y (C) (∂P/∂V)S = y(∂P/∂V)T (D) (∂P/∂V)S = 1/y(∂P/∂V)T

Description : On a P-V diagram of an ideal gas, suppose a reversible adiabatic line intersects a reversible isothermal line at point A. Then at a point A, the slope of the reversible adiabatic line (∂P/∂V)s and the slope of the reversible isothermal line ... Y (C) (∂P/∂V)S = y(∂P/∂V)T (D) (∂P/∂V)S = 1/y(∂P/∂V)T

Last Answer : (C) (∂P/∂V)S = y(∂P/∂V)T

What happens in a reversible adiabatic compression? (A) Heating occurs (B) Cooling occurs (C) Pressure is constant (D) Temperature is constant

Description : What happens in a reversible adiabatic compression? (A) Heating occurs (B) Cooling occurs (C) Pressure is constant (D) Temperature is constant

Last Answer : A) Heating occurs

Work done may be calculated by the expression ∫ p dA for __________ processes. (A) Non-flow reversible (B) Adiabatic (C) Both (A) and (B) (D) Neither (A) nor (B)

Description : Work done may be calculated by the expression ∫ p dA for __________ processes. (A) Non-flow reversible (B) Adiabatic (C) Both (A) and (B) (D) Neither (A) nor (B)

Last Answer : (C) Both (A) and (B)

Stirling and Ericsson cycles are  (a) reversible cycles  (b) irreversible cycles  (c) quasi-static cycles  (d) semi-reversible cycles  (e) adiabatic irreversible cycles.

Description : Stirling and Ericsson cycles are  (a) reversible cycles  (b) irreversible cycles  (c) quasi-static cycles  (d) semi-reversible cycles  (e) adiabatic irreversible cycles.

Last Answer : Answer : a

Carnot cycle is  (a) a reversible cycle (ft) an irreversible cycle  (c) a semi-reversible cycle  (d) a quasi static cycle  (e) an adiabatic irreversible cycle.

Description : Carnot cycle is  (a) a reversible cycle (ft) an irreversible cycle  (c) a semi-reversible cycle  (d) a quasi static cycle  (e) an adiabatic irreversible cycle.

Last Answer : Answer : a

Which of the following processes are thermodynamically reversible  (a) throttling  (b) free expansion  (c) constant volume and constant pressure  (d) hyperbolic and pV = C  (e) isothermal and adiabatic.

Description : Which of the following processes are thermodynamically reversible  (a) throttling  (b) free expansion  (c) constant volume and constant pressure  (d) hyperbolic and pV = C  (e) isothermal and adiabatic.

Last Answer : Answer : e

__________ decreases during adiabatic throttling of a perfect gas. (A) Entropy (B) Temperature (C) Enthalpy (D) Pressure

Description : __________ decreases during adiabatic throttling of a perfect gas. (A) Entropy (B) Temperature (C) Enthalpy (D) Pressure

Last Answer : (D) Pressure

Assertion :- Entropy is always constant for a closed system. Reason :- Closed system is always reversible.

Description : Assertion :- Entropy is always constant for a closed system. Reason :- Closed system is always reversible.

Last Answer : Assertion :- Entropy is always constant for a closed system. Reason :- Closed system is always ... D. If both Assertion & Reason are false.