The effect of changing the evaporator temperature on COP as compared to that of changing the condenser temperature (in vapour compression refrigeration system) is

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The effect of changing the evaporator temperature on COP as compared to that of changing the condenser temperature (in vapour compression refrigeration system) is

A. Less pronounced

B. More pronounced

C. Equal

D. Data insufficient, can't be predicted

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For an isothermal process, the internal energy of a gas

A. Increases

B. Decreases

C. Remains unchanged

D. Data insufficient, can't be predicted

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In a reversible process

A. Tds = dE + dW

B. dE - dW = Tds

C. dW - dE = Tds

D. Tds - dW + dE >0

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Measurement of thermodynamic property of temperature is facilitated by __________ law of thermodynamics.

A. 1st

B. Zeroth

C. 3rd

D. None of these

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Pick out the wrong statement.

A. Cp of monatomic gases such as metallic vapor is about 5 kcal/kg.atom

B. The heat capacity of solid inorganic substance is exactly equal to the heat capacity of the substance in the molten state

C. There is an increase in entropy, when a spontaneous change occurs in an isolated system

D. At absolute zero temperature, the heat capacity for many pure crystalline substances is zero

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In a homogeneous solution, the activity coefficient of a component depends upon the

A. Pressure

B. Composition

C. Temperature

D. All (A), (B) and (C)

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The entropy change in a reversible isothermal process, when an ideal gas expands to four times its initial volume is

A. R log_e 4

B. R log₁₀ 4

C. C_v log₁₀ 4

D. C_v log_e 4

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__________ decreases during adiabatic throttling of a perfect gas.

A. Entropy

B. Temperature

C. Enthalpy

D. Pressure

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First law of thermodynamics deals with the

A. Direction of energy transfer

B. Reversible processes only

C. Irreversible processes only

D. None of these

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Variation of equilibrium pressure with temperature for any two phases of a given substances is given by the __________ equation.

A. Gibbs-Duhem

B. Maxwell's

C. Clapeyron

D. None of these

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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

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Second law of thermodynamics is concerned with the

A. Amount of energy transferred

B. Direction of energy transfer

C. Irreversible processes only

D. Non-cyclic processes only

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Number of phases in a colloidal system is:

A. 1

B. 2

C. 3

D. 4

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Refrigeration cycle

A. Violates second law of thermodynamics

B. Involves transfer of heat from low temperature to high temperature

C. Both (A) and (B)

D. Neither (A) nor (B)

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The compressibility factor of a gas is given by (where, V₁ = actual volume of the gas V₂ = gas volume predicted by ideal gas law)

A. V₁/V₂

B. V₂/V₁

C. V₁ - V₂

D. V₁.V₂

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For multi-component multiple phases to be in equilibrium at the same pressure and temperature, the __________ of each component must be same in all phases.

A. Chemical potential

B. Fugacity

C. Both (A) and (B)

D. Neither (A) nor (B)

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Melting of ice exemplifies a/an

A. Adiabatic process

B. Endothermic reaction

C. Exothermic reaction

D. Process involving a chemical reaction

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The chemical potential of a component (μi) of a phase is the amount by which its capacity for doing all work, barring work of expansion is increased per unit amount of substance added for an infinitesimal addition at constant temperature and pressure. It is given by

A. (∂E/∂n_i)_{S, v, nj}

B. (∂G/∂n_i)_{T, P, nj} = (∂A/∂ni) _{T, v, nj}

C. (∂H/∂n_i)_{S, P, nj}

D. All (A), (B) and (C)

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The second law of thermodynamics states that

A. The energy change of a system undergoing any reversible process is zero

B. It is not possible to transfer heat from a lower temperature to a higher temperature

C. The total energy of system and surrounding remains the same

D. None of the above

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The shape of T-S diagram for Carnot Cycle is a

A. Rectangle

B. Rhombus

C. Trapezoid

D. Circle

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The energy of activation of exothermic reaction is

A. Zero

B. Negative

C. Very large compared to that for endothermic reaction

D. Not possible to predict

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Reduced pressure of a gas is the ratio of its

A. Pressure to critical pressure

B. Critical pressure to pressure

C. Pressure to pseudocritical pressure

D. Pseudocritical pressure to pressure

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Translational kinetic energy of molecules of an ideal gas is proportional to (where, T = absolute temperature of the gas)

A. T

B. √T

C. T²

D. 1/√T

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Third law of thermodynamics is helpful in

A. Prediction of the extent of a chemical reaction

B. Calculating absolute entropies of substances at different temperature

C. Evaluating entropy changes of chemical reaction

D. Both (B) and (C)

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Compound having large heat of formation is

A. More stable

B. Less stable

C. Not at all stable (like nascent O2)

D. Either more or less stable; depends on the compound

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(∂E/∂T)_V is the mathematical expression for

A. C_V

B. Enthalpy change

C. Free energy change

D. None of these

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Fugacity is a measure of the

A. Escaping tendencies of the same substance in different phases of a system

B. Relative volatility of a mixture of two miscible liquids

C. Behaviour of ideal gases

D. None of these

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The reaction A (l) → R(g) is allowed to reach equilibrium conditions in an autoclave. At equilibrium, there are two phases, one a pure liquid phase of A and the other a vapor phase of A, R and S. Initially A alone is present. The numbers of degrees of freedom are:

A. 1

B. 2

C. 3

D. 0

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All gases except __________ shows a cooling effect during throttling process at atmospheric temperature and pressure.

A. Oxygen

B. Nitrogen

C. Air

D. Hydrogen

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For an irreversible process involving only pressure-volume work

A. (dF)_T, p <0

B. (dF)_T, p = 0

C. (dF)_T, p > 0

D. (dA)_T, v >0

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There is a change in __________ during the phase transition.

A. Volume

B. Pressure

C. Temperature

D. All a, b & c

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Accepted Answer

B. More pronounced

The effect of changing the evaporator temperature on COP as compared to that of changing the condenser temperature (in vapour compression refrigeration system) is

Correct Answer :

Show all Chemical Engineering Thermodynamics MCQ

Related Questions

For an isothermal process, the internal energy of a gas

In a reversible process

Measurement of thermodynamic property of temperature is facilitated by __________ law of thermodynamics.

Pick out the wrong statement.

In a homogeneous solution, the activity coefficient of a component depends upon the

The entropy change in a reversible isothermal process, when an ideal gas expands to four times its initial volume is

__________ decreases during adiabatic throttling of a perfect gas.

First law of thermodynamics deals with the

Variation of equilibrium pressure with temperature for any two phases of a given substances is given by the __________ equation.

Which of the following is not correct for a reversible adiabatic process?

Second law of thermodynamics is concerned with the

Number of phases in a colloidal system is:

Refrigeration cycle

The compressibility factor of a gas is given by (where, V₁ = actual volume of the gas V₂ = gas volume predicted by ideal gas law)

For multi-component multiple phases to be in equilibrium at the same pressure and temperature, the __________ of each component must be same in all phases.

Melting of ice exemplifies a/an

The chemical potential of a component (μi) of a phase is the amount by which its capacity for doing all work, barring work of expansion is increased per unit amount of substance added for an infinitesimal addition at constant temperature and pressure. It is given by

The second law of thermodynamics states that

The shape of T-S diagram for Carnot Cycle is a

The energy of activation of exothermic reaction is

Reduced pressure of a gas is the ratio of its

Translational kinetic energy of molecules of an ideal gas is proportional to (where, T = absolute temperature of the gas)

Third law of thermodynamics is helpful in

Compound having large heat of formation is

(∂E/∂T)_V is the mathematical expression for

Fugacity is a measure of the

The reaction A (l) → R(g) is allowed to reach equilibrium conditions in an autoclave. At equilibrium, there are two phases, one a pure liquid phase of A and the other a vapor phase of A, R and S. Initially A alone is present. The numbers of degrees of freedom are:

All gases except __________ shows a cooling effect during throttling process at atmospheric temperature and pressure.

For an irreversible process involving only pressure-volume work

There is a change in __________ during the phase transition.

Also checkout

The effect of changing the evaporator temperature on COP as compared to that of changing the condenser temperature (in vapour compression refrigeration system) is

Correct Answer :

Show all Chemical Engineering Thermodynamics MCQ

Related Questions

For an isothermal process, the internal energy of a gas

In a reversible process

Measurement of thermodynamic property of temperature is facilitated by __________ law of thermodynamics.

Pick out the wrong statement.

In a homogeneous solution, the activity coefficient of a component depends upon the

The entropy change in a reversible isothermal process, when an ideal gas expands to four times its initial volume is

__________ decreases during adiabatic throttling of a perfect gas.

First law of thermodynamics deals with the

Variation of equilibrium pressure with temperature for any two phases of a given substances is given by the __________ equation.

Which of the following is not correct for a reversible adiabatic process?

Second law of thermodynamics is concerned with the

Number of phases in a colloidal system is:

Refrigeration cycle

The compressibility factor of a gas is given by (where, V1 = actual volume of the gas V2 = gas volume predicted by ideal gas law)

For multi-component multiple phases to be in equilibrium at the same pressure and temperature, the __________ of each component must be same in all phases.

Melting of ice exemplifies a/an

The chemical potential of a component (μi) of a phase is the amount by which its capacity for doing all work, barring work of expansion is increased per unit amount of substance added for an infinitesimal addition at constant temperature and pressure. It is given by

The second law of thermodynamics states that

The shape of T-S diagram for Carnot Cycle is a

The energy of activation of exothermic reaction is

Reduced pressure of a gas is the ratio of its

Translational kinetic energy of molecules of an ideal gas is proportional to (where, T = absolute temperature of the gas)

Third law of thermodynamics is helpful in

Compound having large heat of formation is

(∂E/∂T)V is the mathematical expression for

Fugacity is a measure of the

The reaction A (l) → R(g) is allowed to reach equilibrium conditions in an autoclave. At equilibrium, there are two phases, one a pure liquid phase of A and the other a vapor phase of A, R and S. Initially A alone is present. The numbers of degrees of freedom are:

All gases except __________ shows a cooling effect during throttling process at atmospheric temperature and pressure.

For an irreversible process involving only pressure-volume work

There is a change in __________ during the phase transition.

Also checkout

The compressibility factor of a gas is given by (where, V₁ = actual volume of the gas V₂ = gas volume predicted by ideal gas law)

(∂E/∂T)_V is the mathematical expression for